CN100588883C - Energy cost analyzer for a refrigeration system - Google Patents

Energy cost analyzer for a refrigeration system Download PDF

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Publication number
CN100588883C
CN100588883C CN200580008354A CN200580008354A CN100588883C CN 100588883 C CN100588883 C CN 100588883C CN 200580008354 A CN200580008354 A CN 200580008354A CN 200580008354 A CN200580008354 A CN 200580008354A CN 100588883 C CN100588883 C CN 100588883C
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China
Prior art keywords
refrigeration system
drive type
kilowatt
condenser
temperature
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CN1934395A (en
Inventor
万达·J·米勒
小罗伊·S·哈伯德
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York International Corp
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York International Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/19—Calculation of parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2116—Temperatures of a condenser
    • F25B2700/21161—Temperatures of a condenser of the fluid heated by the condenser
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

An energy analyzer for a refrigeration system includes a refrigeration circuit having a compressor (60), a condenser (70) and an evaporator (110), and a first drive type. A memory device contains an equation correlating refrigeration system operating performance using a first drive type to that of a second drive type without requiring the second drive type. The equation defines a polynomial expression having different combinations of two variables, the temperature of water entering the condenser (70), and the ratio defined by the second drive type input power divided by the design second drivetype power. Each of these values is continuously calculated during operation of the refrigeration system. The equation solution correlates to the second drive type input power divided by the design second drive type input power. Energy costs associated with operation of the refrigeration system using the second drive type can then be calculated for comparison with the first drive type.

Description

The energy cost analyzer that is used for refrigeration system
The mutual reference of related application
The application is that the application number on April 7th, 2004 application is 10/819,850 part continuation application.
Technical field
The present invention relates generally to a kind of energy analyzer, more particularly, relate to a kind of energy analyzer that uses with the refrigeration system that constant speed or constant speed drive unit are housed, so that the operating cost saving situation of refrigeration system when comparing with constant speed or constant speed drive unit that speed-changing driving device is housed assessed.
Background technology
Can thereby being circulated, it provide cooling in the refrigerant loop that comprises condenser and evaporimeter by coming compress refrigerant vapor as the refrigerant system of chiller system and so on the driven compressor of constant-speed operation basically to the inner space.People become the performance design of chiller system in the energy that consumes scheduled volume, are issued to rated capacity at rated head (rated head).For example, having the chiller system of the specified 400 tons of cooling capacities that are in specified 85 condenser inflow temperatures (" ECWT ") can be with predetermined power limit (energy rate), as 250 kilowatts of coolings that realize 400 tons.By utilizing constant speed drive unit (" constant spead drive, CSD ") to make the compressor constant-speed operation, during less than the compressor rated capacity, the energy of this compressor consumption is more than satisfying the required energy of cooling load and pressure head at cooling load and pressure head.The amount of power loss that is caused by lower cooling load and lower pressure head is sizable.
Introduce speed-changing driving device (" variable spead drives, VSDs ") come drive compression machine motor make cooling load that compressor motor can response change and variation the cooling pressure head and with variable-speed operation.For example, the cooling load that response has reduced, VSD reduces the running speed of compressor motor, has also reduced the cooling that is provided by refrigerant system so that satisfy the cooling load of this reduction.Even this system moves with full capacity, also can respond lower pressure head (reduce wet bulb ambient temperature) and underspeed.The running speed that reduces compressor motor can reduce the required energy of operation compressor, but result's conserve energy.These saving are significant, and generally its energy saving of operation that only needs several years just can compensate the expense that VSD replaces existing CSD is installed in refrigerant system.
A kind of method of encouraging the refrigerant system owner that VSDs is installed is that setter is that the owner forms a kind of like this device, and wherein owner's expense seldom or do not have expense VSD can be installed on owner's the refrigerant system.Setter can provide the cost savings percentage by refrigerant system operation predetermined amount of time is realized.Yet the calculating of cost savings also is not easy to finish.At first, because removed CSD, no longer exist so measure the direct function module of the cost of energy relevant with the CSD operation.Secondly, hint like that because the speed of VSD compressor motor constantly changes, the operation of VSD is for moving relevant expense with VSD and compare the help that do not have own moving relevant expense with CSD as the title of VSD.
The another kind of method of encouraging the refrigerant system owner that VSDs is installed is that setter is a refrigerant system installing analysis device, and it shows operation VSD and VSD is not installed and moves potential cost savings between the CSD.Yet as previously mentioned, this contrast is not easy to carry out.
So, need a kind of method to compare exactly, calculate and when being presented at refrigeration system and only using VSD or refrigeration system only to use CSD, the difference between the expense relevant with VSD with operation CSD in refrigeration system.
Summary of the invention
The present invention relates to a kind of being used for when refrigeration system is moved with first drive type (drive type), the method that the correlative charges with the correlative charges of the refrigeration system of using the operation of first drive type and the refrigeration system of using second drive type is compared.Its step comprises to be provided and the runnability of the refrigeration system of using first drive type and the more relevant equation of the runnability of the refrigeration system of using second drive type; Import the value relevant with the operation of refrigeration system; Measure the parameter relevant with described equation; Determine with required energy of first drive type running refrigerating system's scheduled time; Calculating is based on the ratio of the required energy of first drive type divided by the required scheduled volume energy of first drive type; Calculate the relevant expense of operation with the refrigeration system of using first drive type; Utilize described equation to calculate the relevant expense of operation with the refrigeration system of use second drive type; And to using the relevant expense of the refrigeration system of first drive type and use the relevant expense of the refrigeration system of second drive type to compare with operation with operation.
The invention still further relates to a kind of refrigeration system, it comprises having the refrigerating circuit that is made of motor compressor driven, condenser and evaporimeter.The first drive type drive compression machine motor.A computer system, this computer system comprises microprocessor and memory device, this memory device stores is used for calculating the equation of the operating cost of the refrigerating circuit that utilizes second drive type.Described equation contains at least one operational factor that records of refrigerating circuit.At least one operational factor of at least one this refrigerating circuit of sensor measurement.Described computer system is configured to determine to use this refrigerating circuit with one section required energy of the scheduled time of first drive type operation.First ratio, this first ratio are the merchant of first drive type institute energy requirement divided by the required scheduled volume energy of first drive type.Second ratio, this second ratio is obtained by computer system, so that come the solving equation formula with first ratio and at least one operational factor.Described second ratio is that second drive type institute energy requirement is divided by the merchant with the required scheduled volume energy of second drive type.
The present invention relates to a kind of refrigeration system, it comprises having the refrigerating circuit that connects in the closed-loop path by motor compressor driven, condenser and evaporimeter.The first drive type drive compression machine motor.At least one operational factor of at least one sensor measurement refrigerating circuit.A computer system comprises microprocessor, memory device and at least one computer program, and this at least one computer program is configured to calculate the operating cost of the refrigerating circuit of using first drive type and second drive type.The amount of the energy that the first drive type scheduled time of use is utilized in refrigerating circuit.First ratio is the merchant of the energy of first drive type use divided by the required scheduled volume energy of first drive type.Second ratio is the merchant of second drive type institute energy requirement divided by the required scheduled volume energy of second drive type.Second ratio is determined by having as first ratio of equation input item and the equation of at least one operational factor.
One of major advantage of the present invention is to have to need not can and have the ability that energy saving compares between the operation of refrigeration system of CSD to the operation of refrigeration system with VSD for the refrigeration system of CSD operation.
Another advantage of the present invention is to have the refrigeration system that need not to be used for the VSD operation can and have the ability that the unconsummated energy saving between the operation of refrigeration system of VSD compares to the operation of refrigeration system with CSD.
Another advantage of the present invention is to have needn't handle the performance curve family relevant with CSD and can and have the ability that the energy saving between the operation of refrigeration system of CSD compares to the operation of refrigeration system with VSD.
Further advantages of the invention are to have needn't handle the performance curve family relevant with VSD and can and have the ability that the unconsummated energy saving between the operation of refrigeration system of VSD compares to the operation of refrigeration system with CSD.
By below in conjunction with the more detailed explanation of accompanying drawing to preferred implementation, other characteristics of the present invention and advantage will be clearer, and accompanying drawing illustrates principle of the present invention in the mode of example.
Description of drawings
Fig. 1 is the schematic diagram of refrigerant system used in the present invention;
Fig. 2 shows one group of use R134a cold-producing medium, uses CSD and condenser inflow temperature is the actual performance curve of 65 multiple ability refrigeration system (multiple capacity reffrigeration systems);
Fig. 3 shows one group of use R134a cold-producing medium, uses VSD and condenser inflow temperature is the actual performance curve of 65 multiple ability refrigeration system;
Fig. 4 shows one group of use R134a cold-producing medium, uses CSD and condenser inflow temperature is the curve match performance curve (curve-fitted performance curve) of 45 to 95 refrigeration system;
Fig. 5 shows one group of use R134a cold-producing medium, uses VSD and condenser inflow temperature is the curve match performance curve of 45 to 95 refrigeration system;
Fig. 6 shows one group, and to use R134a cold-producing medium and condenser inflow temperature be 65 °F, use the curve match performance curve by the refrigeration system of the CSD of the refrigeration system overlaying (overlaid) of using VSD;
Fig. 7 shows one group of use R123 cold-producing medium, uses CSD and condenser inflow temperature is the actual performance curve of 65 multiple ability refrigeration system;
Fig. 8 shows one group of use R123 cold-producing medium, uses VSD and condenser inflow temperature is the actual performance curve of 65 multiple ability refrigeration system;
Fig. 9 shows one group of use R123 cold-producing medium, uses CSD and condenser inflow temperature is the curve match performance curve of 45 to 95 refrigeration system;
Figure 10 shows one group of use R123 cold-producing medium, uses VSD and condenser inflow temperature is the curve match performance curve of 45 to 95 refrigeration system;
Figure 11 show use R123 cold-producing medium, condenser inflow temperature be 65 °F, use curve match performance curve by the refrigeration system of the CSD of the refrigeration system overlaying of using VSD;
Figure 12 shows the flow chart of the refrigeration system that is used for relatively using CSD and the inventive method of the expense of using the VSD refrigeration system;
Figure 13 is the schematic diagram of another embodiment of refrigeration system of using of the present invention.
As possible, in whole accompanying drawings, with the identical identical or similar parts of Reference numeral representative.
The specific embodiment
Fig. 1 is shown schematically in a kind of application of the present invention.AC power 20 is speed-changing driving device (VSD) 30 power supplies of CD-ROM drive motor 50.In another embodiment, VSD 30 can drive more than a motor 50, and each of perhaps a plurality of VSDs 30 or VSD part (sections) can be used for driving corresponding motor 50.Motor 50 is preferred for driving the associated compressors 60 of refrigeration or chiller system 10.
AC power 20 with the AC power of single-phase or heterogeneous (for example, three-phase), fixed voltage and fixed frequency by AC network or be located at on-the-spot distribution system and supply with VSD 30.AC power 20 can be that alternating voltage or the line voltage of 200V, 230V, 380V, 460V or the 600V of 50Hz or 60Hz offers VSD 30 with line frequency according to corresponding AC network preferably.
VSD 30 receives since the specific fixed line voltage of having of AC power 20 and the fixing AC power of line frequency, and provide the AC power of required voltage and required frequency to motor 50, required voltage and required frequency can correspondingly change, to satisfy real needs.The voltage and the frequency of the AC power of preferred VSD 30 supply motors 50 can be above and below the rated voltage and the frequencies of motor 50.In another embodiment, the frequency that VSD 30 provides can be higher and low than the rated frequency of motor 50, but the voltage that provides is only identical with rated voltage or lower than it.
With microprocessor, controller or control panel 40 control VSD 30, motor 50, preferred control panel 40 comprises display and keyboard and can be used to the expense relevant with the operation of the refrigeration system of using VSD 30 and use the relevant expense of operation of the refrigeration system of CSD (not shown) to analyze and compare.In particular, this expense that will describe the VSD 30 that do not exist under the CSD situation and CSD below in more detail relatively.
Control panel 40 is handled utilization control algolithms or software and is controlled the operation of refrigeration system 10 and determine and the control system of complete operation configuration (operating configuration), so that the concrete output quantity demand of reactive mode cooling system 10 and control the discharge capacity (capacity) of compressor 60.In one embodiment, control algolithm can be computer program or the software that is stored in the nonvolatile memory of control panel 40, and it can comprise a series of instructions of being carried out by the microprocessor of control panel 40.Although control algolithm be embodied in the computer program and carry out by microprocessor, yet, should be appreciated that control algolithm also can be used numeral by those skilled in the art and/or analog hardware is implemented and carried out.
Motor 50 preferably can variable-speed operation induction conductivity.Induction conductivity can have any electrode structure suitable, that comprise the two poles of the earth, four utmost points or sextupole.Certainly, the present invention can adopt any suitable can be with the motor of variable-speed operation.
Preferred control panel, microprocessor or controller 40 can provide control signal so that the operation of control VSD 30 to VSD 30, the operation of special control motor 50, thus the optimal operations setting provided according to the specific sensor reading that receives by control panel 40 and for VSD 30 and motor 50.For example, in refrigeration system 10, control panel 40 can be regulated the output voltage that provided by VSD 30 and frequency so that adapt to the altered operating mode of refrigeration system 10, that is to say, for the expectation running speed that obtains motor 50 and the expectation discharge capacity of compressor 60, control panel 40 can respond the increase of load/pressure head state on the compressor 60 or minimizing and output voltage and the frequency that is provided by VSD 30 is provided.Traditional HVAC, refrigeration or liquid chiller system 10 comprise unshowned further feature among many Fig. 1.These features are omitted intentionally, simplify accompanying drawing so that illustrate.
Refrigeration system 10 also comprises condenser structure 70, heat discharge (hest ofrejection, HOR) device 80, expansion device, water cooler or evaporation structure 110 have the supply line 90 that supplies water for condenser 70 and make water turn back to the return line 100 of HOR device 80 such as the such HOR device 80 of cistern.Control panel 40 can comprise modulus (A/D) converter, microprocessor, nonvolatile memory and interface board, so that the operation of control refrigeration system 10.Control panel 40 also can be used to control the operation of VSD 30, motor 50 and compressor 60.Compressor 60 compress refrigerant vapor also are sent to condenser 70 with steam.
Compressor 60 is screw compressor or centrifugal compressor preferably, and compressor can be the compressor of any adequate types also certainly, comprising: the compressor of reciprocating compressor, scroll compressor, Rotary Compressor or other type.Although concern still identical (referring to following equation [1] and [2]), the coefficient of optimum fit curve (fit curve) is the type of compressor and relevant cold-producing medium of being correlated with.The output quantity of compressor 60 can compressor 60 running speed be the basis, and this running speed depends on the output speed of the motor 50 that is driven by VSD 30.The fluid that is sent to the refrigerant vapour of condenser 70 and Ru Shui (also can use air certainly) and so on is heat exchange relationship, and experiences phase transformation and become refrigerant liquid as the result with described liquid heat-exchange.The liquid refrigerant that is condensed flows to evaporimeter 110 from condenser 70 by corresponding expansion device.
Evaporimeter 110 can comprise the supply line that is used for cooling load and the connector of return line.Secondary liquid is preferably water, can certainly be any other suitable secondary liquid, for example, ethylene glycol, propane diols, calcium chloride brine or sodium chloride brine, this secondary liquid is sent in the evaporimeter 110 and by supply line by return line and leaves evaporimeter 110.Liquid refrigerant in the evaporimeter 110 and secondary liquid carry out heat exchange, so that the temperature of secondary liquid reduces.As with the result of secondary liquid heat-exchange, the liquid refrigerants experience phase transformation in the evaporimeter 110 becomes refrigerant vapour.Then the vaporous cryogen in the evaporimeter 110 turns back to compressor 60, thereby has finished circulation.Should be appreciated that, can adopt the condenser 70 and the evaporimeter 110 of any suitable construction in the system 10, as long as in condenser 70 and evaporimeter 110, can obtain suitable cold-producing medium phase transformation.
The present invention includes the equation that the runnability of runnability that can make the refrigeration system 10 with VSD 30 and the refrigeration system with CSD is associated.Equation of the present invention is derived by the program of air conditioner refrigerating research institute (ARI), and this program is verified can accurately to be met with the runnability of the refrigeration system of its representative.Yet, single " best fit (best the fit) " curve (shown in Fig. 2,3 and 7,8) that equation of the present invention produces from the many curves (multiple curves) with respect to the operation of the refrigeration system of using VSD, each curve is represented a selected constant pressure head.Similarly, produce single " best fit " curves from many curves with respect to the operation of the refrigeration system of using CSD.Each " best fit " curve is with corresponding with the operation of the refrigeration curve that enters condenser 70 to fixed temperature from supply line 90 as the cooling fluid of water and so on.In case refrigeration system uses VSD 30 to move the percentage of just can determining to load (% load).This % load is the amount of cooling water that provided by the refrigeration system ratio divided by the designed capacity of refrigeration system.For example, if the refrigerant system design ability is 400 tons of cooling capacities, and the refrigeration system operation provides 200 tons of cooling capacities, and then the % load is 50%.Because identical when the contrast for the % of corresponding C SD and VSD curve load, these curves can overlapping (overlaid).Just can form nomogram by overlapping optimum fit curve is associated, it has public X-y-intercept value (% load), and can Y-axis intercept (% kilowatt) be compared, and operating cost also can compare like this.
Two equations of the present invention are derived, and the refrigeration system (Fig. 2-6) from use R134a cold-producing medium derives, and another is derived from refrigeration system (Fig. 7-11) of using the R123 cold-producing medium.Because each equation is all derived in the same way, therefore only Fig. 2-6 is gone through.Each equation of being derived all is nine multinomials that comprise the like combinations of two parameters, and this will further discuss below in detail.
Fig. 2 shows and uses CSD, uses R134a cold-producing medium and condenser inflow temperature (" ECWT ") is the performance curve of the refrigeration system of 65 (referring to supply lines 90 of Fig. 1).Every curve is corresponding with the refrigeration system with different cooling capacities of representing with ton, and one ton equals 12,000BTUs.Six different cooling capacity curves are arranged, corresponding to the cooling capacity between 400 to 1,400 tons that increase progressively with 200 tons.The 7th curve is an optimum fit curve, and it is calculated by curve fitting procedure (curve-fitting program), and it and six cooling capacity curves meet very goodly.Except Fig. 3 with the performance curve of the refrigeration system of using VSD is corresponding, the data of being measured among the data that Fig. 3 measures and Fig. 2 are identical.Certainly, also can measure and as leaving the cold-producing medium pressure reduction between the water temperature (" LCWT ") of condenser, saturated condensation temperature, evaporimeter and the condenser or the function of the temperature difference pressure head.These different measurements can be by the coefficient that changes described relation in the substitution equation (referring to following equation [1] and [2]).
For increment in the scope from 45 to 95 is that each ECWT of 5 draws one group of similar performance curve.Fig. 4 shows and uses CSD, the performance curve of the refrigeration system in 45 to 95 scopes during with the different ECWTs of 5 degree incremental increase.Similarly, Fig. 5 show and use VSD, the performance curve of the refrigeration system in 45 to 95 scopes during with the different ECWTs of 5 degree incremental increase.
Two performance curves that it is 65 that Fig. 6 has comprised ECWT, use the refrigeration system of CSD and VSD.Although these curves differ from one another, yet these curves are shared common cooling load at the special time that they are employed.For example, if refrigeration system is 500 tons unit, specific cooling load is 350 tons, and then the % load is 70%.Can draw vertical X-intercept line from 70% load and make it and each curve intersection, meet at the A point, meet at the B point for the CSD curve for the VSD curve.Similarly, then can draw horizontal line and form Y intercept point C, and draw horizontal line and form Y intercept point D from the B point of CSD curve from the A point of VSD curve.Each of point C and D is corresponding with the % that reads kilowatt, % kilowatt be energy consumption during with 100% load energy consumption or design the percentage of the ratio of load.In the amount of when load design energy consumption is design kilowatt.Owing to be according to specified motor rotary speed and offer the voltage design load of motor, if therefore motor rotary speed has surpassed specified motor rotary speed, both may surpass 100% % load and % kilowatt, surpass the design load in other words and design kW, shown in a part of curve on right hand top among Fig. 6.
For the calculating energy cost, represent each % kilowatt reading of corresponding speed drive to multiply by its corresponding design kW, can obtain a kilowatt value.Then, kilowatt value of each calculating is subtracted each other each other so that obtain difference kilowatt, and difference kilowatt is exactly to go up difference between some C and the D value after multiply by corresponding design kilowatt at % load (Y-axis).Yet energy consumption is generally represented with kilowatt hour.Therefore,, this difference be multiply by the time quantum of difference kilowatt appearance, and then to multiply by rate be the energy price, as every kilowatt hour in case calculate difference kilowatt.
As mentioned above, although the refrigeration system among Fig. 7-11 has been used different cold-producing medium R123 (perhaps R11), and usefulness R134a (perhaps R22) among Fig. 2-6, and the cooling capacity in the R123 refrigerant system is 300 to 800 tons, and the R134a refrigerant system is 400 to 1400 tons, yet Fig. 2-6 and Fig. 7-11 is all corresponding with the performance of refrigerant systems curve, and represents (formulated) with identical equation.
By the curve match point being made up to obtain single curve for per 5 increments of ECWT, as shown in Figure 2, the exact value of not reentrying.That is to say that matched curve shown in Figure 2 is mated with the curve inaccuracy for any pressure head-power curve shown in Figure 2 (head-capacity curves).Yet because these curves are overlapping substantially each other, (best fit approximations) is quite approaching for the best fit approximation, these values usually any selected pressure head-ability about percent 5 within.The best fit approximation has been got rid of the demand to mass data, carries out these calculating otherwise will need to keep these data.Although this best fit is approximate is a kind of method of simplifying greatly, and it still needs to keep the performance curve for each 5 increment of ECWT of CSD and VSD, and need carry out many calculating so that determine % kilowatt of ratio, as shown in Figure 6.
For fear of curve processing and correlation computations, use optimum fit curve data to obtain the ratio of CSD input and CSD design kilowatt by each 5 increment to ECWT, be defined as " D ", all derive an equation for each of two refrigeration systems in corresponding Fig. 4 and 9.Although these equations have different coefficients, yet each all forms nine multinomials according to the various combinations of two items.First " X " ratio that to be VSD input kilowatt design kilowatt with VSD, its number range from 0.00 to 1.00.Second " Y " is ECWT, by degrees Fahrenheit (°F) measure.Equation [1] is derived by the data that the curve from Fig. 4 takes out, and equation [2] is derived by the data that the curve from Fig. 9 takes out.
D＝(2.348e-2) [1]
+(4.277)×X
+(-8.209)×X 2
+(4.105e-3)×Y
+(-4.735e-2)×X×Y
+(1.641e-1)×X 2×Y
+(-6.694e-5)×Y 2
+(1.621e-4)×X×Y 2
+(-8.363e-4)×X 2×Y 2
D＝(2.188) [2]
+(-1.186e+1)×X
+(1.331e+1)×X 2
+(-5.139e-2)×Y
+(3.526e-1)×X×Y
+(-3.714e-1)×X 2×Y
+(2.957e-4)×Y 2
+(-2.338e-3)×X×Y 2
+(2.504e-3)×X 2×Y 2
These equations can not need the performance curve of the refrigeration system of arbitrary drive unit just can will use the cost of energy of the refrigeration system of CSD to compare with the mensuration cost of energy that uses the VSD refrigeration.
Calculate the cost savings that refrigeration system 10 is used VSD 30 and used CSD to compare in order to use equation, must provide VSD design kilowatt and CSD design kilowatt both, as expense that every kilowatt hour must be provided and ECWT.In one example, for 800 tons of refrigeration systems using the R134a cold-producing medium, the design of VSD kilowatt is 530 kilowatts, and the design of CSD kilowatt is 508 kilowatts, and input VSD is 285 kilowatts.ECWT is 72 °F.Therefore, " X " (input speed change kilowatt/VSD design kilowatt) be 285kw divided by 530kw, about in other words 0.54." Y " item is 72.The value that these value substitution equations [1] are drawn " D " is about 0.68, and this value is CSD input kilowatt (" Z ") divided by the ratio (D=0.68=Z/508) of CSD design kilowatt.This value that has drawn CSD input kilowatt is 345kw.
Check the result that (double-check) obtained by equation in order to contrast graphical data,, the figure shows the speed change curve that uses the R134a cold-producing medium referring to Fig. 5.Line " E " is the y intercept that extends horizontally to point " F " from 0.54 (54%).Because ECWT is 72 °F, so point " F " is the interpolation between the ECWT curve of 70 and 75.Review vertical line from point " F " beginning to the X intercept, point " G " draws about 80% and loads.Referring now to Fig. 4,, this figure is to use the constant speed curve of R134a.With 80% load beginning, point " H " is reviewed vertical line " I " to point " J ", because ECWT is 72 °F, therefore this point also is the interpolation between the ECWT curve of 70 and 75.Review line " K " to the Y intercept from point " J ", point " L " is 0.68, and this point is consistent with the above-mentioned ratio that the D point is calculated.Therefore, this example has confirmed that equation [1] can determine the CSD of refrigeration system and the relation between the VSD performance.
In order then to calculate actual reducing expenses, for simplicity, do following supposition: described value is to keep one hour value, and energy expenditure is every Qian Wa-Xiao Shi $0.06, refrigeration system use between VSD and the use CSD kilowatt on difference be 60 kilowatts (345-285 kilowatts).So, under these conditions one hour can Jie Yuefeiyong $3.60 ($0.06 * 60).
Figure 12 shows the detailed process about the control procedure of the present invention relatively of the expense in the refrigeration system 10 as shown in Figure 1.This method is with step 200 beginning, will be as the value input control panel 40 of the price of every kilowatt hour, variable speed design kilowatt and constant speed design kilowatt and so on.Variable speed design kilowatt and constant speed design kilowatt are the values of being set when refrigeration system is delivered for use by producer, and are decided to be by setter and import.The price of every kilowatt hour can be upgraded as required.Preferably this information is input on the keyboard that is equipped with into control panel 40.For the structure of the control panel 40 that does not have keyboard and screen, an independent device with these features can be installed.The display screen of control panel 40 generally is set at " overall energy savings " or " the total amount of savings ", and the both represents with dollar.
In case these values are input in the control panel 40 in step 200, in step 210, refrigeration system can make control panel 40 measurement parameters, as ECWT or other value relevant with runnability.Preferably can utilize senser element as thermistor and so on from analog input channel, to obtain the ECWT that represents with degrees Fahrenheit.This information and other information directly can be offered control panel 40.In addition, because VSD kilowatt of data of input change with the cooling load of being determined by control panel 40, therefore in step 210, from VSD or optionally the input VSD kilowatt data of harmonic filter or other device with predetermined period of time, as once offering control panel 40 in per two seconds.
After recording parameter, in step 220 value of calculating and in step 230 storage these values.The value that stores not only is included in the calculated value in the step 220, also can be included in the parameter that records in the step 210.Summarize by subject content and to be contained in the following many values that in step 220, calculate, and comprise discussion measurement, calculating and storing step.
Per hour average return condensed device fluid temperature (* 24 hours)
Preferred per second reads return condensed device fluid temperature and is added in the summation.After 3600 seconds, with summation divided by 3600 so that obtain over one hour mean value, then with the summation zero clearing.The mean value in past 24 hours preferably uses first in first out (" FIFO ") mode (first in first out scheme) to roll, and preferably the mean value that latest computed is gone out is kept at first array position.Preferably these values are kept in the random access memory (" RAM ") as (batlery-backed) RAM of battery buffering or BRAM and so on, and comprise operation summation (running sum), data scaling point (deta indexpoint) and last time data point the Julian time.
Per day return condensed device fluid temperature (* 30 days)
Preferably per hour per hour read average return condensed device fluid temperature and be added in the summation.After 24 hours, preferably with summation divided by 24 so that obtain the mean value of the previous day, then with the summation zero clearing.The mean value in past 30 days preferably rolls with the FIFO mode, and preferably the mean value that latest computed is drawn is kept at first array position.Preferably these values are kept in the memory, these values comprise operation summation, data scaling point and last time data point the Julian time.
The return condensed device fluid temperature of monthly average (* December)
Read per day return condensed device fluid temperature and be added in the summation preferred every day.After 30 days, preferably with summation divided by 30 so that obtain in the past one month mean value, then preferably with the summation zero clearing.Preferably will pass by the mean value in December and roll with the FIFO mode, the mean value that latest computed goes out is preferably kept in first array position.Preferably these values are kept in the memory, these values comprise operation summation, data scaling point and last time data point the Julian time.
The return condensed device fluid temperature of annual (* 20 years)
Read the return condensed device fluid temperature of monthly average in preferred every month and be added in the summation.After 12 months, preferably with summation divided by 12 so that obtain over the mean value in 1 year, then preferably with the summation zero clearing.The mean value that preferably will pass by 20 years rolls with the FIFO mode, and preferably the mean value that latest computed is gone out is kept at first array position.Preferably these values are kept in the memory, these values comprise operation summation, data scaling point and last time data point the Julian time.
Per hour minimum return condensed device fluid temperature (* 24 hours)
Preferred per second reads return condensed device fluid temperature and compares with the minimum of a value of last time.If it is less than the minimum of a value of last time, preferably with last time minimum of a value be set at the Current Temperatures reading.The minimum of a value that preferably will pass by 24 hours is rolled with the FIFO mode, and the up-to-date minimum of a value of assessing out is preferably kept in first array position.Preferably these values are kept in the memory, these values comprise the Julian time of data point last time.
Day minimum return condensed device fluid temperature (* 30 days)
When the calendar day (calendar day) changes, check the minimum of a value of preceding 24 hours per hour minimum return condensed device fluid temperature as that day.Minimum of a value for past 30 days is preferably rolled with the FIFO mode, preferably the up-to-date minimum of a value of assessing out is kept at first array position.Preferably these values are kept in the memory, these values comprise the Julian time of data point last time.
Every month minimum return condensed device fluid temperature (* December)
When calendar month changes, check the minimum of a value of preceding 30 days day minimum return condensed device fluid temperature as that month.Minimum of a value for past 12 months is preferably rolled with the FIFO mode, preferably the up-to-date minimum of a value of assessing out is kept at first array position.Preferably these values are kept in the memory, these values comprise the Julian time of data point last time.
Year minimum return condensed device fluid temperature (* 20 years)
When the calendar year changes, check the minimum of a value of preceding 12 months every month minimum return condensed device fluid temperature as that year.Minimum of a value for past 20 years is preferably rolled with the FIFO mode, preferably the up-to-date minimum of a value of assessing out is kept at first array position.Preferably these values are kept in the memory, these values comprise the Julian time of data point last time.
The metering of VSD kilowatt hour
This calculating can be carried out as described below: once be sent to control panel from VSD with VSD kilowatt in per two seconds.This value is added in the VSD kilowatt of total value.When this summation surpasses 1800 (reading once in per hour 3600 seconds/per 2 seconds), because data collection rate hereto, 1800 kilowatts equal 1 kilowatt hour, the metering of VSD kilowatt hour is an increment with one, and from VSD kilowatt of total value, deduct 1800, this is equivalent to part kilowatt hour (partial kW-Hr), makes part kilowatt hour component in the VSD kilowatt hour metering reset (re-set) like this.If suitably set access level (access level), can revise VSD kilowatt hour variable.Preferably the metering of VSD kilowatt hour and VSD kilowatt of total value are kept in the memory.
The metering of CSD kilowatt hour
When cooler moves, per two seconds ground with VSD kilowatt divided by VSD design kilowatt so that obtain VSD% design kilowatt.Utilize ECWT and described equation, can determine CSD% design kilowatt.Preferably it be multiply by CSD design kilowatt so that obtain CSD kilowatt.Preferably CSD kilowatt of value is added in the CSD kilowatt of total value.When this summation surpasses 1800 (reading once in per hour 3600 seconds/per 2 seconds), because data collection rate hereto, 1800 kilowatts equal 1 kilowatt hour, the metering of CSD kilowatt hour is an increment with one preferably, preferably from CSD kilowatt of total value, deduct 1800, this is equivalent to the part kilowatt hour, makes that like this part kilowatt hour component in the metering of CSD kilowatt hour is resetted.If suitably set access level, can revise the value of CSD kilowatt hour metering.Preferably the metering of CSD kilowatt hour and CSD kilowatt of total value are kept in the memory.
Always energy-conservation
When cooler moved, VSD kilowatt and CSD kilowatt of calculating per two seconds ground utilize transmitting preferably deducted VSD kilowatt and calculate the energy of saving from CSD kilowatt.Then this value is added to and saves in kilowatt total value.When this summation surpasses 1800 (reading once in per hour 3600 seconds/per 2 seconds), because data collection rate hereto, 1800 kilowatts equal 1 kilowatt hour, always energy-conservation (kilowatt hour) is increment with one preferably, and preferably from kilowatt total value of saving, deduct 1800, this is equivalent to the part kilowatt hour, and this makes the part kilowatt hour component of VSD kilowatt hour metering reset.If suitably set access level, can revise total energy-conservation value.Preferably a total kilowatt total value energy-conservation and that save is kept in the memory.
Per hour always energy-conservation (* 24 hours)
Preferably per hour read once always energy-conservation.From up-to-date reading, deduct the reading that read in the past in a hour so that determine current value hourly.The per hour value in past 24 hours is preferably rolled with the FIFO mode, and the up-to-date per hour value that preferably will calculate recently is kept at first array position.Preferably these values are kept in the memory, these values comprise operation summation, data scaling point and last time data point the Julian time.
Every day always energy-conservation (* 30 days)
Preferably read always energy-conservation at midnight every day.From the nearest reading that has just obtained, deduct the reading that obtained in the past in a day so that determine the value of current every day.The value of the every day in past 30 days is preferably rolled with the FIFO mode, and up-to-date value every day that preferably will calculate is kept at first array position.Preferably these values are kept in the memory, these values comprise operation summation, data scaling point and last time data point the Julian time.
Every month always energy-conservation (* December)
Preferably read always energy-conservation at the midnight of every month last day.From nearest reading, deduct the reading that obtained in the past in month so that determine current every month value.Every month the value in past 12 months is preferably rolled with the FIFO mode, and the up-to-date every month value that preferably will calculate is kept at first array position.Preferably will comprise operation summation, data scaling point and last time data point these values of Julian time be kept in the memory.Also store the actual metered reading at every month the end of month.
Every year always energy-conservation (* 20 years)
Preferably read always energy-conservation at the midnight of annual last day.Preferably from nearest reading, deduct the reading that obtained in the past in a year so that determine the value in current every year.Past 20 years, annual value was preferably rolled with the FIFO mode, and preferably the value in the up-to-date every year that will calculate recently is kept at first array position.Preferably will comprise operation summation, data scaling point and last time data point these values of Julian time be kept in the memory.
In always reducing expenses of dollar
Preferably will always energy-conservationly multiply by the expense of every kilowatt hour so that calculate always reducing expenses in dollar.
In step 230, preserved after described value and the parameter, can with as previous those values of determining with preferably output to the display that is included on the control panel 40 with those values of reducing expenses relevant.
Figure 13 generally shows further application of the invention.Replace the VSD 30 except that CSD 130 is set, Figure 13 is identical with Fig. 1.In another embodiment, CSD 130 can provide electric power to the motor 50 more than, and each that perhaps utilize a plurality of CSDs 130 provides electric power to corresponding motor 50.
CSD 130 receives from the specific fixed line voltage of having of AC power 20 and the fixing AC power of line frequency, and provides the AC power of fixed voltage and frequency to motor 50, so that with the rotating speed CD-ROM drive motor 50 of substantial constant.
The present invention includes the equation that the runnability of runnability that can make the refrigeration system 10 with CSD 130 and the refrigeration system with VSD is associated.Equation of the present invention is derived by the program of air conditioner refrigerating research institute (ARI), and this program is verified can accurately to be met with the runnability of the refrigeration system of its representative.Yet, single " best fit " curve (shown in Fig. 2,3 and 7,8) that many curves that equation utilization of the present invention moves from the refrigeration system of using CSD produce, each curve is represented a selected constant pressure head.Similarly, produce single " best fit " curves from many curves with respect to the operation of the refrigeration system of using VSD.Each " best fit " curve with as the cooling fluid of water and so on, corresponding with the operation of the refrigeration curve that enters condenser 70 to fixed temperature from supply line 90.In case refrigeration system uses CSD 130 to move the percentage of just can determining to load (% load).This % load is the amount of cooling water that provided by the refrigeration system ratio divided by the designed capacity of refrigeration system.For example, if the refrigerant system design ability provides 200 tons for 400 tons of cooling capacity refrigeration system operations, then the % load is 50%.Because the % load for corresponding C SD and VSD curve is identical when contrasting, these curves can be overlapping.Just can form nomogram by overlapping optimum fit curve is associated, it has public X-y-intercept value (% load), and can Y-axis intercept (% kilowatt) be compared, and operating cost also can compare like this.
In other words, because identical CSD and VSD curve use in the same way, so the front is equally applicable to here the discussion of Fig. 2-6 (and Fig. 7-11) curve.In addition, owing to used the optimum fit curve data identical with Figure 4 and 5, make the runnability of refrigeration system 10 with VSD 30 and refrigeration system 10 derived equation [1] that is mutually related compare with [4] with derived equation [3] with [2] and represented similar nine multinomials, and derived equation [3] and [4] make the refrigeration system 10 with CSD130 interrelated with the runnability of the refrigeration system (Figure 13) with VSD with CSD (Fig. 1).
For fear of curve processing and correlation computations, use optimum fit curve data to obtain the ratio of VSD input and VSD design kilowatt by each 5 increment to ECWT, be defined as " E ", all derive an equation for each of two refrigeration systems in corresponding Fig. 5 and 10.Although these equations have different coefficients, yet each all forms nine multinomials according to the various combinations of two items.First " A " ratio that to be CSD input kilowatt design kilowatt with CSD, its number range from 0.00 to 1.00.Second " B " is ECWT, by degrees Fahrenheit (°F) measure.Equation [3] is derived by the data of the taking-up of the curve from Fig. 5, and equation [4] is derived by the data of the taking-up of the curve from Figure 10.
E＝(9.353e-1) [3]
+(-2.689)×A
+(2.825)×A 2
+(-2.825e-2)×B
+(7.027e-2)×A×B
+(-4.832e-2)×A 2×B
+(2.231e-4)×B 2
+(-3.907e-4)×A×B 2
+(2.308e-4)×A 2×B 2
E＝(-3.665) [4]
+(15.87)×A
+(-12.17)×A 2
+(9.531e-2)×B
+(-4.237e-1)×A×B
+(3.544e-1)×A 2×B
+(-6.102e-4)×B 2
+(2.905e-3)×A×B 2
+(-2.469e-3)×A 2×B 2
These equations can not need the performance curve of the refrigeration system of arbitrary drive unit just can will use the cost of energy of the refrigeration system of VSD to compare with the mensuration cost of energy that uses the CSD refrigeration.
In order to calculate the cost savings amount of money that refrigeration system 10 is used CSD 130 and used VSD to compare, must provide CSD design kilowatt and VSD design kilowatt both, as expense that every kilowatt hour must be provided and ECWT.For simplicity, and the result in order relatively to obtain from equation [1] and [3], be example with 800 tons of refrigeration systems utilizing the R134a cold-producing medium once more.Because this example of refrigeration system has utilized VSD to carry out overtesting, therefore with equation [1] but the CSD that calculates input kilowatt value supplier formula [a 3] use.So the design that time train value: VSD is provided kilowatt is that 530 kilowatts, the design of CSD kilowatt are that 508 kilowatts, input CSD are 345 kilowatts and ECWT is 72 °F.Therefore, " A " (input constant speed kilowatt/CSD design kilowatt) be 345kW divided by 508kW, perhaps be about 0.67." Y " item is 72.The value that these value substitution equations [3] are drawn " E " is about 0.56, and this value is VSD input kilowatt (" F ") divided by the ratio (E=0.56=F/530) of CSD design kilowatt.This value that has drawn VSD input kilowatt is about 297 kilowatts.
Check the result who obtains by this equation in order to contrast graphical data,, the figure shows the constant speed curve that uses the R134a cold-producing medium referring to Fig. 4.Line " K " is the y intercept that extends horizontally to point " L " from 0.67 (67%).Because ECWT is 72 °F, so point " L " is the interpolation between the ECWT curve of 70 and 75.Review vertical line from point " J " beginning to the X intercept, point " H " draws about 80% and loads.Referring now to Fig. 5,, this figure is to use the speed change curve of R134a.With 80% load, point " G ", beginning is reviewed vertical line " M " to point " F ", because ECWT is 72 °F, therefore this point also is the interpolation between the ECWT curve of 70 and 75.Review line " E " to the Y intercept from point " F ", point " N " is 0.54, its above-mentioned ratio that calculates for the E point about 3 percent within.It should be noted that, at least a portion of 3 percent differences can be from equation [1] combination between speed change input that equation [3] calculates kilowatt or 0.56, and this is owing to the result of calculation of utilizing equation [3] to obtain is to utilize the calculating of equation [1] to obtain from the front.Therefore, this example has confirmed that equation [3] determined the relation between the performance of the CSD of refrigeration system and VSD.
Figure 12 shows the detail flowchart about the control procedure of the present invention relatively of the expense in the refrigeration system 10 as shown in figure 13.This method is with step 200 beginning, will be as the value input control panel 40 of the price of every kilowatt hour, variable speed design kilowatt, constant speed design kilowatt and so on.Variable speed design kilowatt and constant speed design kilowatt are the values of being set when refrigeration system is delivered for use by producer, and are decided to be by setter and import.The price of every kilowatt hour can be upgraded as required.The display screen of control panel 40 usually is set at " overall energy savings " or " always reducing expenses ", and the both represents with dollar.Preferably this information is input on the keyboard that is equipped with into control panel 40.
In case these values are input in the control panel 40 in step 200, in step 210, refrigeration system can make the control panel measurement parameter, as ECWT or other value relevant with runnability.Preferably can utilize senser element as thermistor and so on from analog input channel, to obtain the ECWT that represents with degrees Fahrenheit.Can with this information and other information directly offers control panel 40 or obtain from control panel 40.In addition, because CSD kilowatt of data of input change with the cooling load of being determined by control panel 40, therefore in step 210, from CSD or optionally the input CSD kilowatt data of harmonic filter with predetermined period of time, as once offering control panel 40 in per two seconds.
After recording parameter, in step 220 value of calculating and in step 230 storage these values.The value that stores not only is included in the calculated value in the step 220, also can be included in the parameter that records in the step 210.Summarize by subject content and to be contained in the following many values that in step 220, calculate, and comprise discussion measurement, calculating and storing step.
The metering of CSD kilowatt hour
This calculating can as described belowly be carried out: once be sent to control panel from CSD with CSD kilowatt in per two seconds.This value can be added in the CSD kilowatt of total value.When this summation surpasses 1800 (reading once in per hour 3600 seconds/per 2 seconds), because data collection rate hereto, 1800 kilowatts equal 1 kilowatt hour, the metering of CSD kilowatt hour is an increment with one, and from CSD kilowatt of total value, deduct 1800, this is equivalent to the part kilowatt hour, makes the part kilowatt hour component of CSD kilowatt hour metering reset like this.If suitably set access level, can revise the value of CSD kilowatt hour metering.Preferably the metering of CSD kilowatt hour and CSD kilowatt of total value are kept in the memory.AAA
The metering of VSD kilowatt hour
Should per two seconds once with CSD kilowatt divided by CSD design kilowatt so that obtain CSD% design kilowatt.Utilize ECWT and described equation, can determine VSD% design kilowatt.Preferably it be multiply by VSD design kilowatt so that obtain VSD kilowatt.Preferably VSD kilowatt of value is added in the VSD kilowatt of total value.When this summation surpasses 1800 (reading once in per hour 3600 seconds/per 2 seconds), because 1800 kilowatts equal 1 kilowatt hour, the metering of VSD kilowatt hour is an increment with one preferably, preferably from VSD kilowatt of total value, deduct 1800, this is equivalent to the part kilowatt hour, makes the part kilowatt hour component of VSD kilowatt hour metering reset like this.If suitably set access level, can revise the value of VSD kilowatt hour metering.Preferably the metering of VSD kilowatt hour and VSD kilowatt of total value are kept in the memory.
Although shown example of the present invention can be used for relatively utilizing the refrigeration system of CSD operation and the refrigeration system of utilizing VSD to move, can expect, the one VSD and the 2nd VSD of also can be to two kinds of different VSDs, promptly having different configurations compare, perhaps to two kinds of different CSDs, promptly a CSD and the 2nd CSD compare.As long as provide and the corresponding equation of the operation of the drive unit that will compare, just can carry out these relatively.It is further contemplated that, can the similar or dissimilar different driving devices more than two be compared.
Although invention has been described with reference to preferred implementation, it will be understood by those skilled in the art that under the prerequisite that does not exceed scope of the present invention, can make various changes and substitute these elements with equivalent element.In addition, can make many remodeling so that concrete situation or material and instruction of the present invention adapt, this can not exceed essential scope of the present invention.Therefore, the present invention is not limited to as being used to realize best mode of the present invention and these specific embodiment of illustrating, and the present invention should comprise all embodiments that fall in the claims scope.

Claims (33)

  1. One kind be used for to the refrigeration system of using first drive type and the method for using the relevant expense of the operation of refrigeration system of second drive type to compare, described method comprises the steps:
    The refrigeration system of using first drive type is provided;
    Provider's formula, so that calculate the operating cost of the described refrigeration system of using second drive type, this equation contains at least one operating parameter of described refrigeration system;
    Measure described at least one operating parameter of described refrigeration system;
    Determine the relevant expense of operation with the refrigeration system of described use first drive type;
    Calculate the relevant expense of operation with the refrigeration system of described use second drive type with described equation and described at least one operating parameter that records; And
    Expense relevant with the operation of the refrigeration system of described use first drive type and the expense relevant with the operation of the refrigeration system of described use second drive type are compared.
  2. 2. the method for claim 1, wherein the step of described computational costs comprises the steps: to determine in order to move the energy that one section described first drive type of the scheduled time of described refrigeration system needs.
  3. 3. method as claimed in claim 2, wherein, the step of described computational costs also comprises the steps: to calculate the ratio of the energy that described first drive type is required divided by the required scheduled volume energy of first drive type; And
    Wherein, with in the described described equation of ratio substitution that calculates.
  4. 4. method as claimed in claim 3, wherein, described first drive type is a kind of in constant speed drive unit and the speed-changing driving device, described second drive type is a kind of in constant speed drive unit and the speed-changing driving device.
  5. 5. method as claimed in claim 4, wherein, described first drive type is a constant speed drive unit, described second drive type is a speed-changing driving device.
  6. 6. method as claimed in claim 4, wherein, described first drive type is a speed-changing driving device, described second drive type is a constant speed drive unit.
  7. 7. the method for claim 1, wherein describedly provide equational step to comprise multinomial is provided.
  8. 8. method as claimed in claim 7 wherein, describedly provides polynomial step to comprise that input moves relevant value with described refrigeration system.
  9. 9. the method for claim 1, wherein, described at least one operating parameter that records is selected from least one parameter in the group of being made up of the temperature difference between the fluid temperature (F.T.) that enters condenser, the fluid temperature (F.T.) of leaving condenser, saturated condensation temperature and evaporator temperature and the condenser temperature.
  10. 10. as claim 5 or 6 described methods, wherein, also comprise the steps:
    In predetermined lasting time, repeat to move the step that relevant expense compares to the expense relevant with the refrigeration system of described use speed-changing driving device with the refrigeration system operation of described use constant speed drive unit with predetermined time interval; And
    Storage repetition expense result relatively.
  11. 11. the method for claim 1, wherein describedly provide equational step to comprise the multinomial that is following form is provided:
    C1+(C2×A)+(C3×A 2)+(C4×B)+(C5×A×B)+(C6×A 2×B)+(C7×B 2)+(Cg×A×B 2)+(C9×A 2×B 2)
    Wherein, C1 to C9 is a constant, the A ratio that to be first drive type input kilowatt design kilowatt with first drive type, and B is described at least one operating parameter that records.
  12. 12. method as claimed in claim 11, wherein, described at least one operating parameter that records be selected from by the fluid temperature (F.T.) that enters condenser, the fluid temperature (F.T.) of leaving condenser, saturated condensation temperature, and evaporator temperature and condenser temperature between the group formed of the temperature difference at least one parameter.
  13. 13. method as claimed in claim 12 wherein, describedly provides equational step to comprise according to the cold-producing medium that uses in the described refrigeration system to determine that described polynomial constant C 1 is to C9.
  14. 14. method as claimed in claim 12 wherein, describedly provides equational step to comprise according to the condenser fluid that uses in the described refrigeration system to determine that described polynomial constant C 1 is to C9.
  15. 15. method as claimed in claim 12 wherein, describedly provides equational step to comprise according to the evaporimeter fluid that uses in the described refrigeration system to determine that described polynomial constant C 1 is to C9.
  16. 16. method as claimed in claim 15, wherein, described evaporimeter fluid next group is freely selected in fluid, described one group of fluid by water, ethylene glycol, propane diols, calcium chloride brine, and sodium chloride brine form.
  17. 17. method as claimed in claim 12 wherein, describedly provides equational step to comprise according to the type of compressor of using in the described refrigeration system to determine that described polynomial constant C 1 is to C9.
  18. 18. a refrigeration system comprises:
    Refrigerating circuit, it has the closed-loop path that is made of motor compressor driven, condenser and evaporimeter;
    Be used for first drive type of drive compression machine motor;
    Be used for measuring at least one sensor of at least one operating parameter of described refrigerating circuit;
    The computer system that comprises microprocessor, memory device and at least one computer program, described at least one computer program comprises:
    Be used to calculate the functional module of the operating cost of the described refrigerating circuit of using described first drive type and second drive type;
    Be used for calculating in one period scheduled time in the functional module of described refrigerating circuit by the energy of described first drive type use;
    Be used to calculate energy that described first drive type is used functional module divided by first ratio of the required scheduled volume energy of described first drive type;
    Be used to calculate the functional module of the energy that described second drive type is required divided by second ratio of the required scheduled volume energy of second drive type; Wherein, described second ratio is input to described equational equation and determines by having described first ratio and described at least one operating parameter.
  19. 19. refrigeration system as claimed in claim 18, wherein, described first drive type is a constant speed drive unit, and described second drive type is a speed-changing driving device.
  20. 20. refrigeration system as claimed in claim 18, wherein, described first drive type is a speed-changing driving device, and described second drive type is a constant speed drive unit.
  21. 21. refrigeration system as claimed in claim 18, wherein, described first drive type is first constant speed drive unit, and described second drive type is second constant speed drive unit.
  22. 22. refrigeration system as claimed in claim 18, wherein, described first drive type is first speed-changing driving device, and described second drive type is second speed-changing driving device.
  23. 23. refrigeration system as claimed in claim 19, wherein, described at least one computer program compares and stores comparative result to the relevant expense of the refrigerating circuit operation of the using described constant speed drive unit expense relevant with the refrigerating circuit operation of using described speed-changing driving device repeatedly.
  24. 24. refrigeration system as claimed in claim 18, wherein, described at least one operating parameter that records next group is freely selected in parameter, described one group of parameter by the fluid temperature (F.T.) that enters condenser, the fluid temperature (F.T.) of leaving condenser, saturated condensation temperature, and evaporator temperature and condenser temperature between the temperature difference form.
  25. 25. refrigeration system as claimed in claim 19, wherein, described equation is a multinomial.
  26. 26. refrigeration system as claimed in claim 25, wherein, described polynomial form is:
    C1+(C2×A)+(C3×A 2)+(C4×B)+(C5×A×B)+(C6×A 2×B)+(C7×B 2)+(C8×A×B 2)+(C9×A 2×B 2)
    Wherein, C1 to C9 is a constant, the A ratio that to be constant speed drive unit input kilowatt design kilowatt with constant speed drive unit, and B is described at least one operating parameter that records.
  27. 27. refrigeration system as claimed in claim 26, wherein, described at least one operating parameter that records next group is freely selected in parameter, described one group of parameter by the fluid temperature (F.T.) that enters condenser, the fluid temperature (F.T.) of leaving condenser, saturated condensation temperature, and evaporator temperature and condenser temperature between the temperature difference form.
  28. 28. refrigeration system as claimed in claim 26 wherein, determines that according to the described refrigerant system that uses different cold-producing mediums described polynomial constant C 1 is to C9.
  29. 29. refrigeration system as claimed in claim 26 wherein, determines that according to the described refrigerant system that uses different condenser fluids described polynomial constant C 1 is to C9.
  30. 30. refrigeration system as claimed in claim 26 wherein, determines that according to the described refrigerant system that uses dissimilar compressors described polynomial constant C 1 is to C9.
  31. 31. refrigeration system as claimed in claim 26 wherein, determines that according to the described refrigerant system that uses the different evaporators fluid described polynomial constant C 1 is to C9.
  32. 32. refrigeration system as claimed in claim 31, wherein, described evaporimeter fluid is selected in next group fluid freely, and described one group of fluid is made up of water, ethylene glycol, propane diols, calcium chloride brine and sodium chloride brine.
  33. 33. the method for the expense that a refrigeration system that is used for relatively using constant speed drive unit is relevant with the operation of the refrigeration system of using speed-changing driving device, described method comprises the steps:
    The refrigeration system of using constant speed drive unit is provided;
    Provider's formula, so that calculate the operating cost of the described refrigeration system of using speed-changing driving device, this equation comprises at least one operating parameter of described refrigeration system;
    Measure described at least one operating parameter of described refrigeration system;
    Determine the relevant expense of operation with the refrigeration system of described use constant speed drive unit;
    Calculate and the relevant expense of the refrigeration system of described use speed-changing driving device operation with described equation and described at least one operating parameter that records; And
    Expense relevant with the operation of the refrigeration system of described use constant speed drive unit and the expense relevant with the refrigeration system operation of described use speed-changing driving device are compared.
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