CN103868290B - Based on the method for refrigeration efficiency ratio and degree of superheat control electric expansion valve - Google Patents
Based on the method for refrigeration efficiency ratio and degree of superheat control electric expansion valve Download PDFInfo
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- CN103868290B CN103868290B CN201410064647.0A CN201410064647A CN103868290B CN 103868290 B CN103868290 B CN 103868290B CN 201410064647 A CN201410064647 A CN 201410064647A CN 103868290 B CN103868290 B CN 103868290B
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- 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
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Abstract
The open one of the present invention can ensure that refrigeration system is operated under high energy efficiency ratio state, thereby saves the method based on refrigeration efficiency ratio and degree of superheat control electric expansion valve of the energy, comprises the steps: that a. is to SHs, COPs, ε s and ε c assignment; B. detect SHfAnd COPf; C. judge SHs with? SHfDifference absolute value be greater than ε s? to return to b step; No, carry out d step; D. judge COPs and COPfDifference be greater than ε c? to carry out e step; No, return to b step; E. SHs is revised, make COPfStable and approach COPs most; F. give SHs by correction result, return to b step.
Description
Technical field
The present invention relates to a kind of control method to electric expansion valve in refrigeration system, especially one and can ensure refrigeration systemSystem is operated under high energy efficiency ratio state, thereby saves the side based on refrigeration efficiency ratio and degree of superheat control electric expansion valve of the energyMethod.
Background technology
Existing vapor compression refrigeration system is made up of compressor, condenser, electric expansion valve and evaporimeter substantially, workTime, low-pressure steam cold-producing medium, through compressor boil down to high steam, is condensed into highly pressurised liquid through condenser, after electric expansion valveForm the gas-liquid mixed refrigerant of low-pressure low-temperature, absorb the explosive evaporation by the refrigerating medium heat of evaporimeter after entering evaporimeterFor low-pressure steam, then enter compressor compresses ... move in circles, refrigerating medium completes cooling to final material by circulation.In process of refrigerastion, need the flow of electric expansion valve to control, thereby ensure that appropriate cold-producing medium, by evaporimeter, makesEvaporimeter heat exchange area comprehensively plays a role. At present, be to adopt degree of superheat control method to electric expansion valve, concrete grammar is firstSet refrigeration system degree of superheat calibration value SHs, degree of superheat calibration value SHs and degree of superheat actual value SHfThe limit value ε s of difference, overheatedScale definite value SHs has determined conventionally in the time of design refrigeration system, and ε s can require to set according to control accuracy, as0.5,1 or 2 etc.; Measure afterwards refrigeration system degree of superheat actual value SHf, measure evaporator outlet temperature, detect evaporation simultaneouslyIn device, the pressure (inlet pressure value) of reality, is converted to the temperature value in evaporimeter by this pressure signal, and both differences are systemCooling system degree of superheat actual value SHf; Judge again SHs and degree of superheat actual value SHfDoes is difference greater than the ε s setting? to adjustThe aperture of whole electric expansion valve, to control the flow of cold-producing medium, no, electric expansion valve is not adjusted, still keep formerSome refrigerant flows. This kind of control method is to loop consideration with separate refrigeration, do not consider load and external conditionThe factors such as variation, cannot really make refrigeration system in optimum Working.
Energy Efficiency Ratio COP is one of index of weight cooling system service behaviour, definition Q/W, and Q is cold, W is compressorPower, COP is more high better, the same with the degree of superheat, and COP also has Energy Efficiency Ratio calibration value COPs, Energy Efficiency Ratio actual value COPfPoint, energyEffect is also to determine in the time designing refrigeration system than calibration value COPs, and Energy Efficiency Ratio actual value COPfNeed measure and calculation, Q=G*(Ti-To), wherein G is refrigerating medium flow, and Ti – To is the temperature difference of refrigerating medium turnover evaporimeter; W is that power meter is surveyedThe compressor horsepower obtaining.
Up to now, also not about the relevant report of electric expansion valve being controlled taking Energy Efficiency Ratio as parameter.
Summary of the invention
The present invention is in order to solve the existing above-mentioned technical problem of prior art, to provide one can ensure refrigeration system workDo under high energy efficiency ratio state, thus the method based on refrigeration efficiency ratio and degree of superheat control electric expansion valve of saving the energy.
Technical solution of the present invention is: a kind of side based on refrigeration efficiency ratio and degree of superheat control electric expansion valveMethod, is characterized in that carrying out as follows:
Set:
SHs is degree of superheat calibration value, SHfFor degree of superheat actual value;
COPs is Energy Efficiency Ratio calibration value, COPfFor Energy Efficiency Ratio actual value;
ε s is the limit value of the difference of degree of superheat calibration value and degree of superheat actual value;
ε c is the limit value of the difference of Energy Efficiency Ratio calibration value and Energy Efficiency Ratio actual value;
A. to SHs, COPs, ε s and ε c assignment;
B. detect SHfAnd COPf；
C. judge SHs and SHfDifference absolute value be greater than ε s? to return to b step; No, carry out d step;
D. judge COPs and COPfDifference be greater than ε c? to carry out e step; No, return to b step;
E. SHs is revised, make COPfStable and approach COPs most;
F. again give SHs by correction result, return to b step.
Described e step is to adopt successive approximation method to revise SHs, makes COPfStable and approach COPs most; Concrete sideMethod is: judge degree of superheat calibration value SHs and degree of superheat actual value SHfDifference for just? be, according to increasing direction to reviseStep-length is revised degree of superheat calibration value SHs, no, degree of superheat calibration value SHs is carried out to revise step-length according to reducing directionRevise; Every correction once, to COPfJudge, as COPfIncrease, continue according to this direction to revise step-length to overheated scaleDefinite value SHs revises; Otherwise, after setting-up time of time delay, change direction and to revise step-length, degree of superheat calibration value SHs enteredRow is revised, until COPfStable and approach COPs most.
The present invention is taking Energy Efficiency Ratio and the degree of superheat simultaneously as the control parameter of electric expansion valve, considers load and outerThe factors such as portion's condition variation, dynamically revise degree of superheat calibration value, make the really duty in high energy efficiency ratio of refrigeration system, fromAnd the saving energy.
Brief description of the drawings
Fig. 1 is the flow chart of the embodiment of the present invention.
Detailed description of the invention
The embodiment of the present invention as the prior art, is set:
SHs is degree of superheat calibration value, SHfFor degree of superheat actual value;
COPs is Energy Efficiency Ratio calibration value, COPfFor Energy Efficiency Ratio actual value;
ε s is the limit value of the difference of degree of superheat calibration value and degree of superheat actual value;
ε c is the limit value of the difference of Energy Efficiency Ratio calibration value and Energy Efficiency Ratio actual value;
COPs=3.0, SHs=5.0 DEG C, freezes as R22, and power of motor is 5kW, and refrigerating medium is water.
Carry out in accordance with the following steps:
A. to SHs, COPs, ε s and ε c assignment;
Compose SHs=5.0 DEG C, COPs=3.0, ε s=2 DEG C, ε c=0.5, wherein ε s=2 DEG C, ε c=0.5 are according to control accuracyAnd determine.
B. detect SHfAnd COPf；
B.1 detect SHf
Measuring evaporator pressure is that P is 4.97MPa(absolute pressure), because refrigeration is R22, determined corresponding evaporation temperatureDegree is 0 DEG C, and measuring evaporator outlet temperature is 8 DEG C, SHf=8–0=8℃；
B.2 detect COPf
Record compressor horsepower W=5kW, refrigerating medium enters the temperature T i=12 DEG C of evaporimeter, from the refrigerating of evaporimeter outputThe temperature T o=7 DEG C of agent, refrigerating medium flow G=2400, Q=2400*(12-7)=12KW, COPf=12/5=2.4；
C. judge SHs and SHfDifference absolute value be greater than ε s?
SHs and SHfAbsolute difference be 8 DEG C-5.0 DEG C=3 DEG C, result is greater than 2 DEG C, is greater than ε s, therefore, returns to bStep.
Now, due to SHs and SHfAbsolute difference be greater than ε s, control electric expansion valve, adjust electric expansion valveAperture, to control refrigerant flow.
Return after b step, continue to detect SHfAnd COPf；
B.1 detect SHf
Due to the aperture of adjusted electric expansion valve, evaporator pressure is that P is increased to 5.30MPa(absolute pressure), due toRefrigeration is R22, and determined corresponding evaporating temperature is 2 DEG C, and measuring evaporator outlet temperature is 6 DEG C, SHf=6–2=4℃；
B.2 detect COPf
Record compressor horsepower W=5kW, refrigerating medium enters the temperature T i=12 DEG C of evaporimeter, from the refrigerating of evaporimeter outputThe temperature T o=8 DEG C of agent, refrigerating medium flow G=2400, Q=2400*(12-8)=9.6KW, COPf=9.6/5=1.92；
C. judge SHs and SHfDifference absolute value be greater than ε s?
SHs and SHfAbsolute difference be 5 DEG C-4.0 DEG C=1 DEG C, result is less than 2 DEG C, is less than ε s, therefore, carries out dStep;
D. judge COPs and COPfDifference be greater than ε c?
COPs and COPfDifference be 3.0-1.92=1.18, result is to be greater than 0.5, is greater than ε c, carries out e step; If thisTime by calculating, judging COPs and COPfDifference be less than 0.5, Energy Efficiency Ratio actual value COP is describedfIt is little with Energy Efficiency Ratio COPs difference,Do not need electric expansion valve to adjust, return to b step and remeasure;
E. SHs is revised, make COPfStable and approach COPs most;
Adopt successive approximation method to revise SHs, concrete grammar is: judge degree of superheat calibration value SHs and the degree of superheatActual value SHfDifference for just? because of degree of superheat calibration value SHs and SHfDifference be 5 DEG C-4.0 DEG C=1 DEG C, for just, pressDegree of superheat calibration value SHs is revised to revise step-length according to increasing direction. Revise step-length and be redefined for 1 DEG C, to overheatedScale definite value SHs is modified to 6 DEG C by 5+1, to COPfJudge, as COPfIncrease to some extent than 1.92, continue according to this directionTo revise step-length, degree of superheat calibration value is revised, every correction once all will be to COPfJudge, as COPfContinuing increases,Continue to revise, be modified to 7 DEG C, 8 DEG C, 9 DEG C by degree of superheat calibration value SHs, COPfBe increased to 2.8, continue to increase the degree of superheatAfter calibration value SHs, COPfBe reduced to 2.7 by 2.8,, after setting-up time of time delay, change direction right to revise step-length (1 DEG C)Degree of superheat calibration value SHs revises, and reduces 1 DEG C to 8 DEG C by degree of superheat calibration value SHs by 9 DEG C, makes COPfBe increased to2.8, stable and approach COPs most; Now 8 DEG C is revised SHs;
F. again give SHs by 8 DEG C of correction results, compose SHs=8, return to b step.
Can find out from embodiment, if according to prior art, as SHs and SHfAbsolute difference be 5 DEG C-4.0 DEG C=1 DEG C, when result is less than ε s, although COPfLower, also adjust without the aperture to electric expansion valve, cannot ensure refrigerationSystem operates in the most efficient state of COP all the time. The present invention, taking Energy Efficiency Ratio as parameter, dynamically revises degree of superheat calibration value, makesRefrigeration system is the duty in high energy efficiency ratio really,
Compared with prior art, COP value can improve 0.2 ~ 0.8, thereby saves the energy.
As adopting the control method of prior art, its COP mean value is 1.8, adopts the compressor that power is 10kw, everyHour maximum produced colds are 10kw*1.8=18kw; And according to control method of the present invention, COP value is increased to 2 ~2.6, if produce the cold of 18kw, compressor only need expend the energy of 18kw/2 ~ 2.6, i.e. 6.92 ~ 9kw energy is relatively existingTechnology, every generation 18kw cold, the present invention can save the electric energy of 1 ~ 3.18kw, has obvious energy-saving effect.
Claims (2)
1. the method based on refrigeration efficiency ratio and degree of superheat control electric expansion valve, is characterized in that entering as followsOK:
Set:
SHs is degree of superheat calibration value, SHfFor degree of superheat actual value;
COPs is Energy Efficiency Ratio calibration value, COPfFor Energy Efficiency Ratio actual value;
ε s is the limit value of the difference of degree of superheat calibration value and degree of superheat actual value;
ε c is the limit value of the difference of Energy Efficiency Ratio calibration value and Energy Efficiency Ratio actual value;
A. to SHs, COPs, ε s and ε c assignment;
B. detect SHfAnd COPf；
C. judge SHs and SHfDifference absolute value be greater than ε s? adjust the aperture of electric expansion valve and return to b step;No, carry out d step;
D. judge COPs and COPfDifference be greater than ε c? to carry out e step; No, return to b step;
E. SHs is revised, make COPfStable and approach COPs most;
F. again give SHs by correction result, return to b step.
According to claim 1 based on refrigeration efficiency than and the method for degree of superheat control electric expansion valve, it is characterized in thatDescribed e step is to adopt successive approximation method to revise SHs, makes COPfStable and approach COPs most; Concrete grammar is: judgementDegree of superheat calibration value SHs and degree of superheat actual value SHfDifference for just? be, according to increasing direction to revise step-length to mistakeTemperature calibration value SHs revises, no, degree of superheat calibration value SHs is revised to revise step-length according to reducing direction; Often repairJust once, to COPfJudge, as COPfIncrease, continue degree of superheat calibration value SHs to be entered to revise step-length according to this directionRow is revised; Otherwise, after setting-up time of time delay, change direction and to revise step-length, degree of superheat calibration value SHs is revised, straightTo COPfStable and approach COPs most.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104132432B (en) * | 2014-08-22 | 2016-06-29 | 四川长虹空调有限公司 | The approximant control method of electric expansion valve |
| CN106403427B (en) * | 2016-08-31 | 2019-04-02 | 烟台欧森纳地源空调股份有限公司 | A kind of control method of refrigeration system startup stage electric expansion valve |
| CN111413115B (en) * | 2019-01-08 | 2022-05-31 | 陈主福 | Intelligent measurement and verification method and system for the efficiency of refrigerating and air-conditioning mainframe |
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