CN106871391A - Performance for Air Conditioning Systems online test method based on limited measure node - Google Patents
Performance for Air Conditioning Systems online test method based on limited measure node Download PDFInfo
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- CN106871391A CN106871391A CN201710281402.7A CN201710281402A CN106871391A CN 106871391 A CN106871391 A CN 106871391A CN 201710281402 A CN201710281402 A CN 201710281402A CN 106871391 A CN106871391 A CN 106871391A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F25B49/022—Compressor control arrangements
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Abstract
A kind of Performance for Air Conditioning Systems online test method based on limited measure node, by arranging measuring point real time record measuring point parameter in air-conditioning system in operation, is compressed machine flow the Fitting Calculation, obtains the refrigerant flow of air-conditioning system；The heat exchange amount for carrying out condenser and evaporator with reference to kind of refrigeration cycle theory is calculated, obtain actual refrigerating capacity, compressor actual power and the real-time EER (Energy Efficiency Ratio) of air-conditioning system, and air quantity and the pressure drop of indoor and outdoor machine are calculated based on characteristic curve of fan and blower fan resistance heat exchanger characteristics equation, realize the on-line checking to Performance for Air Conditioning Systems；Reasonable in design, reliable operation of the invention, without dismantling instrument by real time on-line monitoring is carried out to operating air-conditioning system.
Description
Technical field
The present invention relates to a kind of technology of field of refrigeration, specifically a kind of air-conditioning system based on limited measure node
Performance online detection method.
Background technology
Smart home concept becomes increasingly popular, and is increasingly becoming the development trend of following household.Smart home is needed to sky
The performance parameters such as the efficiency of device are adjusted to be monitored in real time, the parameter such as including refrigerant flow, refrigerating capacity, efficiency, in order to reality
When to controller feed back air-conditioner running status.Therefore air-conditioner real-time performance prediction needs to meet：Performance monitoring needs sky
Real-time monitoring is carried out under tune device running status.
The content of the invention
The present invention cannot measure refrigerant flow for prior art by the temperature, pressure measuring point of compressor import and export
Deng correlation performance parameters, therefore the defects such as the performance parameter of system cannot be accurately obtained, propose a kind of sky based on limited measure node
Adjusting system performance online detection method, arranges measuring point in air-conditioning system, gathers real time execution parameter, and air-conditioning is obtained by computing
The efficiency of system, without dismantle air-conditioning can real-time monitoring air-conditioning performance and other key parameters.
The present invention is achieved by the following technical solutions：
The present invention is compressed machine flow by arrangement measuring point real time record measuring point parameter in air-conditioning system in operation
The Fitting Calculation, obtains the refrigerant flow of air-conditioning system；The heat exchange amount of condenser and evaporator is carried out with reference to kind of refrigeration cycle theory
Calculate, obtain actual refrigerating capacity, compressor actual power and the real-time EER (Energy Efficiency Ratio) of air-conditioning system, and based on fan performance
Curve and blower fan resistance-heat exchanger characteristics equation are calculated air quantity and the pressure drop of indoor and outdoor machine, realize to Performance for Air Conditioning Systems
On-line checking.
Described arrangement measuring point refers to：Arrange that compressor exhaust temperature is surveyed between the compressor and condenser of air-conditioning system
Point and Compressor Discharge Pressure measuring point, respectively obtain the delivery temperature parameter and pressure at expulsion parameter of compressor；Condenser with
Condenser liquid pipe temperature point is arranged between evaporator, liquid pipe temperature parameter is obtained；Pressure is arranged between evaporator and compressor
Contracting machine suction temperature measuring point and suction pressure of compressor measuring point, respectively obtain suction temperature parameter and the pressure of inspiration(Pi) ginseng of compressor
Number；Evaporator fan return air temperature measuring point is arranged in the return side of evaporator fan, return air temperature parameter is obtained.
Expansion valve is provided between described condenser and evaporator.
Evaporator fan power instrument and condenser fan power instrument are respectively equipped with described evaporator and condenser,
Record evaporator fan power and condenser fan power.
Described compressor flowrate the Fitting Calculation refers to：Using the theoretical meter of compressor by compressor performance parameter fitting
Formula is calculated, the compressor flowrate theoretical model under optional frequency is changed on the isoparametric multinomial shape of inlet and outlet pressure
Formula, 10 Modulus Models or 20 Modulus Models provided by compressor manufacturer obtain volume of data point, so as to by multinomial
Coefficient Fitting out, then can be used for calculate refrigerant flow.
Described refrigerant flow is：Wherein：M is refrigerant flow, C0~
C3To treat fitting coefficient,It is volume of cylinder, viIt is inspiratory volume, fxIt is compressor frequency, poIt is Compressor Discharge Pressure, piFor
Suction pressure of compressor.
Described kind of refrigeration cycle theory refers to：Enthalpy according to refrigerant flow and evaporator gateway is calculated air-conditioning
The medium side heat exchange amount (i.e. theoretical refrigerating capacity) of system, similarly calculates condenser heat exchange amount, but need to consider under special circumstances
Thermal loss calculates actual refrigerating capacity again；Due to the conservation of energy of air-conditioning system, can be according to actual refrigerating capacity, condenser heat exchange amount
With the actual power that thermal loss calculates compressor, the real-time EER of air-conditioning system is obtained.
Described special circumstances are included but is not limited to：Compressor is arranged in when near evaporator, and compressor can dissipate one
Divide the cold of evaporator air side.
Described medium side heat exchange amount is：Qeva=m × (h1-h4), wherein：QevaIt is refrigerating capacity, h1It is evaporator outlet
Enthalpy, h4It is the enthalpy of evaporator inlet.
The enthalpy h of described evaporator outlet1Can be obtained by compressor air suction temperature parameter and pressure of inspiration(Pi) parameter.
Described actual refrigerating capacity is：Qreal=Qeva-Qloss, wherein：QlossIt is thermal loss.
Described thermal loss is：Wherein：H is the coefficient of heat transfer, Dia
It is compressor external diameter, L is compressor length, and R is blower fan aperture (%), RbassThe reference opening amount of blower fan, T during for testoIt is compression
Machine delivery temperature, TrIt is evaporator return air temperature.
Described condenser heat exchange amount is：Qcond=m × (h2(p2,T2)-h3(p2,T3)), wherein：QcondFor condenser is changed
Heat, h2It is the enthalpy of condensator outlet, h3It is the enthalpy of condenser inlet, p2It is the pressure of condensator outlet, T2It is condenser
Liquid pipe temperature, T3It is the temperature of condenser inlet.
Described compressor actual power is：Wreal=Wceff+Qloss, wherein：WrealIt is compressor actual power, WceffFor
Compressor theoretical power (horse-power), Wceff=Qcond-Qeva。
Described Energy Efficiency Ratio is：Wherein：WeAnd WcIt is evaporator fan power and condenser wind
Acc power.
Described calculating based on characteristic curve of fan and blower fan resistance-heat exchanger characteristics equation refer to：According to blower fan manufacturer
The characteristic curve of fan relational expression (Pq-Power) of offer can obtain the of the pressure drop of the blower fan under given power and air quantity
One relational expression；With reference to heat exchanger (condenser and evaporator) air-side blockage characteristic equation and the relation of air quantity and wind speed,
Can obtain the pressure drop of heat exchanger air side and second relational expression of air quantity；Two relational expression simultaneous solutions, obtain given blower fan
Air quantity and pressure drop under power.
Described characteristic curve of fan is：Δ P=f (q, P), wherein：Δ P is pressure drop, and q is air quantity, and P is power of fan.
Described heat exchanger air-side blockage characteristic equation is：Wherein：G is acceleration of gravity,L、d
For the intrinsic parameter of heat exchanger and, it is known that v be wind speed.
The wind speed is with the relation of air quantity：Wherein：A is heat exchanger lateral area windward.
Air quantity and pressure drop under described given power of fan are：Wherein：K is multiplying for all constant terms
Product, is definite value for this heat exchanger k.
The present invention relates to a kind of system for realizing the above method, including：Refrigerant flow the Fitting Calculation module, two devices are calculated
Module and blower fan computing module, wherein：Refrigerant flow fitting module is connected and collect and process machine fortune with system monitoring measuring point
Line parameter, including evaporating temperature measuring point, condensation temperature measuring point, compressor frequency, and the real-time refrigerant flow parameter of Transmission system
To two device computing modules, two device computing modules are connected and transmit system according to the computational algorithm that evaporator, condenser import and export enthalpy difference
Cold, compressor horsepower, system EER, blower fan computing module are connected and pass with two device wind collateral resistance characteristics and characteristic curve of fan
The defeated real-time air quantity of blower fan and power information.
Technique effect
Compared with prior art, the present invention it is reasonable in design, without dismantling air-conditioner by under air-conditioning system running status
The performance of real-time monitoring air-conditioning system and other key parameters.
Brief description of the drawings
Fig. 1 is schematic diagram of the present invention；
Fig. 2 is arrangement measuring point schematic diagram；
Fig. 3 is kind of refrigeration cycle theory schematic diagram；
In figure：1 is compressor, 2 is compressor exhaust temperature measuring point, 3 is Compressor Discharge Pressure measuring point, 4 is condenser,
5 is condenser liquid pipe temperature point, 6 is expansion valve, 7 is evaporator fan return air temperature measuring point, 8 is evaporator, 9 is compressor
Suction temperature measuring point, 10 are suction pressure of compressor measuring point, WeIt is evaporator fan power instrument, WcIt is condenser fan power
Instrument.
Specific embodiment
As shown in figure 1, the present embodiment is comprised the following steps：
Arrangement measuring point, real time record measuring point parameter in step 1, air-conditioning system in operation.
As shown in Fig. 2 described arrangement measuring point refers to：Compressor is arranged between the compressor and condenser of air-conditioning system
Delivery temperature measuring point and Compressor Discharge Pressure measuring point, respectively obtain the delivery temperature parameter T of compressor0With pressure at expulsion parameter
p0；Go out to arrange liquid pipe temperature point in condenser liquid pipe, obtain liquid pipe temperature parameter T2；Arranged between evaporator and compressor
Compressor air suction temperature point and suction pressure of compressor measuring point, respectively obtain the suction temperature parameter T of compressor1And pressure of inspiration(Pi)
Force parameter p1；Evaporator fan return air temperature measuring point is arranged in the return side of evaporator fan, return air temperature parameter T is obtainedr。
Expansion valve is provided between described condenser and evaporator.
Evaporator fan power instrument and condenser fan power instrument are respectively equipped with described evaporator and condenser,
Record evaporator fan power WeWith condenser fan power Wc。
Step 2, the parameter obtained according to step 1 are compressed machine flow and are fitted by compressor flowrate the Fitting Calculation module
Calculate, obtain the refrigerant flow of air-conditioning system.
Described compressor flowrate the Fitting Calculation refer to：It is theoretical using the compressor by compressor performance parameter fitting
Computing formula, the compressor flowrate theoretical model under optional frequency is changed on the isoparametric multinomial of inlet and outlet pressure
Form, 10 Modulus Models provided by compressor manufacturer obtain volume of data point, so as to by the Coefficient Fitting in multinomial
Out, then can be used to calculate refrigerant flow.
Described compressor is frequency-changeable compressor.
Described refrigerant flow m is：Wherein：C0~C3To treat fitting system
Number,It is volume of cylinder, viIt is inspiratory volume, fxIt is compressor frequency, piIt is suction pressure of compressor.
Described Compressor Inlet Pressure pi, compressor delivery pressure po, volume of cylinderInspiratory volume viWith frequency fx
Know.
10 coefficient formulas that standard testing experiment according to compressor draws can be obtained in different evaporating temperatures, condensation temperature
A series of datas on flows under degree and frequency, are fitted, you can obtain C according to above formula by least square method0~C3。
It is step 3, theoretical with reference to kind of refrigeration cycle, refrigerating capacity, the condensation of air-conditioning system are calculated by two device computing modules
Device heat exchange amount, compressor horsepower and EER (Energy Efficiency Ratio).
Described kind of refrigeration cycle theory refers to：Enthalpy according to refrigerant flow and evaporator gateway is calculated air-conditioning
The medium side heat exchange amount (i.e. theoretical refrigerating capacity) of system, similarly calculates condenser heat exchange amount, but need to consider under special circumstances
Thermal loss calculates actual refrigerating capacity again；Due to the conservation of energy of air-conditioning system, can be according to actual refrigerating capacity, condenser heat exchange amount
With the actual power that thermal loss calculates compressor, the real-time EER of air-conditioning system is obtained.
The present embodiment is special circumstances, i.e. compressor is arranged near evaporator, and compressor can dissipate a part of evaporator
The cold of air side.
Described medium side heat exchange amount QevaFor：Qeva=m × (h1-h4), wherein：h1It is the enthalpy of evaporator outlet, h4For
The enthalpy of evaporator inlet.
As shown in figure 3, A points are evaporator outlet, B points are condenser inlet, and C points are condensator outlet, and D points are evaporator
Entrance, corresponding enthalpy is respectively h1、h2、h3And h4。
According to Calculation of Physical Properties formula, the enthalpy of the point can be calculated using the temperature and pressure of a bit.And A points and B points
Pressure p1、p2With temperature T1、T2, it is known that can obtain the enthalpy h of A points and B points1、h2；The temperature T of C points3, it is known that the pressure of C points
It is identical with B points, the enthalpy h of D points4It is identical with C points.
The medium side heat exchange amount obtained by above formula is theoretical refrigerating capacity, also needs to consider by the compressor and surrounding by evaporator
The thermal loss that causes of air heat-exchange, therefore theoretical refrigerating capacity is modified, obtain actual refrigerating capacity.
Described actual refrigerating capacity is：Qreal=Qeva-Qloss, wherein：QlossIt is thermal loss (dissipation amount).
Described thermal loss QlossFor：Wherein：H is the coefficient of heat transfer, d
It is compressor external diameter, L is compressor length, and R is blower fan aperture (%), RbassThe reference opening amount of blower fan, T during for testrIt is evaporation
Device return air temperature.
Described coefficient of heat transfer h is usually 50.
Described blower fan aperture R is directly read by blower fan instrument.
Described condenser heat exchange amount QcondFor：Qcond=m × (h2(p2,T2)-h3(p2,T3))。
Described compressor actual power can be analyzed calculating by the conservation of energy of air-conditioning system.
Described compressor actual power is：Wreal=Wceff+Qloss, wherein：WrealIt is compressor actual power, WceffFor
Compressor theoretical power (horse-power), Wceff=Qcond-Qeva。
Described Energy Efficiency Ratio is：
Step 4, calculated by blower fan computing module based on characteristic curve of fan and blower fan resistance-heat exchanger characteristics equation
To the air quantity of indoor and outdoor machine, the on-line checking to Performance for Air Conditioning Systems is realized.
Described calculating based on characteristic curve of fan and blower fan resistance-heat exchanger characteristics equation refer to：According to blower fan manufacturer
The characteristic curve of fan relational expression (Pq-Power) of offer can obtain the of the pressure drop of the blower fan under given power and air quantity
One relational expression；With reference to heat exchanger (condenser and evaporator) air-side blockage characteristic equation and the relation of air quantity and wind speed,
Can obtain the pressure drop of heat exchanger air side and second relational expression of air quantity；Two relational expression simultaneous solutions, obtain given blower fan
Air quantity and pressure drop under power.
Described characteristic curve of fan is：Δ P=f (q, P), wherein：Δ P is pressure drop, and q is air quantity, and P is power of fan.
The derivation of second described relational expression is as follows：The air wide pre. drop and wind speed of the indoor and outdoor machine of air-conditioning system
There is quadratic relation, and there is linear relationship with air quantity in wind speed, i.e.,：Wherein：G accelerates for gravity
Degree, A is heat exchanger lateral area windward,L, d are intrinsic (known) parameter of heat exchanger, by the measurement condition point data of heat exchanger with
And wind speed is substituted into the relation of air quantity, can be obtained：Δ P=kq2, wherein：K is heat exchanger characteristics resistance coefficient, i.e., all constant terms
Product.
Air quantity q and pressure drop Δ P under described given power of fan are：Known power of fan P's
In the case of, simultaneous equations are binary quadratic equation, can solve unique real root of pressure drop and air quantity.
There is linear relationship in described power of fan P and blower fan aperture R, i.e.,：P=aR+b, wherein：A and b wait to be fitted
Coefficient.
Described blower fan aperture R is with the relation of pressure drop Δ P：Δ P=f (R).
Described blower fan aperture R is with the relation of air quantity q：Q=f (R).
Above-mentioned specific implementation can by those skilled in the art on the premise of without departing substantially from the principle of the invention and objective with difference
Mode local directed complete set is carried out to it, protection scope of the present invention is defined and not by above-mentioned specific implementation institute by claims
Limit, each implementation in the range of it is by the constraint of the present invention.
Claims (8)
1. a kind of Performance for Air Conditioning Systems online test method in limited measure node, it is characterised in that by air-conditioning in operation
Arrangement measuring point real time record measuring point parameter, is compressed machine flow the Fitting Calculation in system, obtains the cold-producing medium stream of air-conditioning system
Amount；The heat exchange amount for carrying out condenser and evaporator with reference to kind of refrigeration cycle theory is calculated, and obtains actual refrigerating capacity, the pressure of air-conditioning system
Contracting machine actual power and real-time energy efficiency ratio, and be calculated based on characteristic curve of fan and blower fan resistance-heat exchanger characteristics equation
The air quantity of indoor and outdoor machine and pressure drop, realize the on-line checking to Performance for Air Conditioning Systems.
2. Performance for Air Conditioning Systems online test method according to claim 1, it is characterized in that, described arrangement measuring point is
Refer to：Compressor exhaust temperature measuring point and Compressor Discharge Pressure measuring point are arranged between the compressor and condenser of air-conditioning system,
Respectively obtain the delivery temperature parameter and pressure at expulsion parameter of compressor；Condenser liquid pipe is arranged between condenser and evaporator
Temperature point, obtains liquid pipe temperature parameter；Compressor air suction temperature point and compressor are arranged between evaporator and compressor
Pressure of inspiration(Pi) measuring point, respectively obtains the suction temperature parameter and pressure of inspiration(Pi) parameter of compressor；In the return side of evaporator fan
Arrangement evaporator fan return air temperature measuring point, obtains return air temperature parameter.
3. Performance for Air Conditioning Systems online test method according to claim 2, it is characterized in that, described evaporator and condensation
Evaporator fan power instrument and condenser fan power instrument are respectively equipped with device, evaporator fan power and condenser is recorded
Power of fan.
4. Performance for Air Conditioning Systems online test method according to claim 1, it is characterized in that, described compressor flowrate is intended
It is total to refer at last：Using the compressor theoretical calculation formula by compressor performance parameter fitting, by the compression under optional frequency
Machine flow theoretical model is changed on the isoparametric polynomial form of inlet and outlet pressure, 10 provided by compressor manufacturer
Modulus Model or 20 Modulus Models obtain volume of data point, so as to out, then can be used to the Coefficient Fitting in multinomial count
Calculate refrigerant flow.
5. Performance for Air Conditioning Systems online test method according to claim 4, it is characterized in that, described refrigerant flow
For：Wherein：M is refrigerant flow, C0~C3To treat fitting coefficient,For cylinder holds
Product, viIt is inspiratory volume, fxIt is compressor frequency, poIt is Compressor Discharge Pressure, piIt is suction pressure of compressor.
6. Performance for Air Conditioning Systems online test method according to claim 1, it is characterized in that, described kind of refrigeration cycle is theoretical
Refer to：Enthalpy according to refrigerant flow and evaporator gateway is calculated the medium side heat exchange amount of air-conditioning system, i.e., theoretical
Refrigerating capacity, then calculates condenser heat exchange amount；Due to the conservation of energy of air-conditioning system, changed according to actual refrigerating capacity, condenser
Heat and thermal loss calculate compressor actual power, obtain the real-time EER of air-conditioning system；
Described medium side heat exchange amount is：Qeva=m × (h1-h4), wherein：QevaIt is refrigerating capacity, h1It is the enthalpy of evaporator outlet
Value, can be obtained, h by compressor air suction temperature parameter and pressure of inspiration(Pi) parameter4It is the enthalpy of evaporator inlet, actual refrigerating capacity
For：Qreal=Qeva-Qloss, wherein：QlossIt is thermal loss,Wherein：H is to change
Hot coefficient, d is compressor external diameter, and L is compressor length, and R is blower fan aperture (%), RbassThe benchmark of blower fan is opened during for test
Degree, ToIt is compressor exhaust temperature, TrIt is evaporator return air temperature；
Described condenser heat exchange amount is：Qcond=m × (h2(p2,T2)-h3(p2,T3)), wherein：QcondIt is condenser heat exchange amount,
h2It is the enthalpy of condensator outlet, h3It is the enthalpy of condenser inlet, p2It is the pressure of condensator outlet, T2It is condenser liquid pipe
Temperature, T3It is the temperature of condenser inlet；
Described compressor actual power is：Wreal=Wceff+Qloss, wherein：WrealIt is compressor actual power, WceffIt is compression
Machine theoretical power (horse-power), Wceff=Qcond-Qeva；
Described Energy Efficiency Ratio is：Wherein：WeAnd WcIt is evaporator fan power and condenser fan work(
Rate.
7. Performance for Air Conditioning Systems online test method according to claim 1, it is characterized in that, it is described based on fan performance
Curve and blower fan resistance-heat exchanger characteristics equation calculate and refer to：Obtained according to the characteristic curve of fan relational expression that blower fan manufacturer provides
Pressure drop and first relational expression of air quantity to the blower fan under given power；With reference to heat exchanger air-side blockage characteristic equation with
And air quantity and the relation of wind speed, can obtain the pressure drop of heat exchanger air side and second relational expression of air quantity；Two relational expression connection
It is vertical to solve, the air quantity under given power of fan and pressure drop are obtained, specially：
Characteristic curve of fan is：Δ P=f (q, P), wherein：Δ P is pressure drop, and q is air quantity, and P is power of fan；
Heat exchanger air-side blockage characteristic equation is：Wherein：G is acceleration of gravity,L, d are that heat exchanger is intrinsic
Parameter and, it is known that v be wind speed；
Wind speed is with the relation of air quantity：Wherein：A is heat exchanger lateral area windward.
8. a kind of system for realizing any of the above-described claim methods described, it is characterised in that including：Refrigerant flow fitting meter
Module, two device computing modules and blower fan computing module are calculated, wherein：Refrigerant flow fitting module is connected with system monitoring measuring point
And collect and process machine operational factor and the real-time refrigerant flow parameter of Transmission system are to two device computing modules, two device computing module roots
It is connected and transmits refrigerating capacity, compressor horsepower, system EER, blower fan meter according to the computational algorithm of evaporator, condenser import and export enthalpy difference
Module is calculated to be connected with two device wind collateral resistance characteristics and characteristic curve of fan and transmit the real-time air quantity of blower fan and power information；
Described compressor operation parameters, including evaporating temperature measuring point, condensation temperature measuring point, compressor frequency.
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