CN106840733A - A kind of Properties of Air-conditioning Unit online test method and its testing equipment - Google Patents
A kind of Properties of Air-conditioning Unit online test method and its testing equipment Download PDFInfo
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- CN106840733A CN106840733A CN201710199761.8A CN201710199761A CN106840733A CN 106840733 A CN106840733 A CN 106840733A CN 201710199761 A CN201710199761 A CN 201710199761A CN 106840733 A CN106840733 A CN 106840733A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention provides a kind of Properties of Air-conditioning Unit online test method, it is characterised in that：Database, calculating heat exchange ratio are stored into including building database, collecting test data, linear fit acquisition enthalpy equation of linear regression group, calculating enthalpy, enthalpy, judge whether the step such as qualified.The method can realize Properties of Air-conditioning Unit on-line checking, be easy to technical staff to grasp air-conditioner set operation conditions in time, improve the efficiency of air-conditioner set research and development and troubleshooting, and accuracy in detection is high.The present invention also provides a kind of accuracy in detection Properties of Air-conditioning Unit online detection instrument high, easy to use.
Description
Technical field
The present invention relates to Properties of Air-conditioning Unit online measuring technique field, more specifically to a kind of air-conditioner set
Can online test method and its testing equipment.
Background technology
With expanding economy and the improvement of people's living standards, people to indoor air quality attention degree more and more higher,
Air-conditioning turns into the essential product of huge numbers of families.Service behaviour judgement to air-conditioner set is current air-conditioner set maintenance and answers
A key project in.In the middle of conventional maintenance and application, otherwise being only according to temperature is judged to the performance of air-conditioner set
Estimate, lack the judgement of effective test data and rationality, or being depot repair, cause workload big, and can not exist in real time
Line detection, inconvenience is brought to application.Therefore, on-line monitoring detection technique is greatly developed and using the advanced property of contemporary society
Energy monitoring device carries out scientific and effective performance judgement, and to refrigerating and air conditioning industry and instrument and meter industry, further development has
Profound significance.
Return factory's Measuring error except can not allow technical staff's technology grasp Properties of Air-conditioning Unit situation in addition to, its accuracy in detection
It is also undesirable, reason mainly have it is following some：1) thermometry for being used in engineering mostly wall temperature measurement method, due to working medium
Temperature distributing disproportionation in pipeline is even, and the temperature of this method measurement has deviation；2) pressure measurement method for being used in engineering is more
It is static pressure measurement method, the practical work process of working medium is flowing, and the measurement of this method can less survey the dynamic pressure of fluid, deposit measured value
In deviation；3) enthalpy of working medium in theory can be by thermodynamics universal relation formula directly by state equation and perfect gas specific heat capacity
Equation is calculated.But, requirement of this method to state equation is higher, and equation must have meter higher to gas-liquid two-phase simultaneously
Calculate precision.4) the real work engineering of working medium is flowing, but working medium is often inquired about in scene using static temperature, pressure value
Enthalpy, then carry out the calculating of the performances such as refrigerating capacity, heating capacity, COP, even if even, to have consideration dynamic be also by means of various warps
Test correlation to be calculated, result of calculation is produced deviation.
The content of the invention
It is online it is an object of the invention to provide a kind of Properties of Air-conditioning Unit to overcome shortcoming of the prior art and deficiency
Detection method, the method can realize Properties of Air-conditioning Unit on-line checking, be easy to technical staff to grasp air-conditioner set operation shape in time
Condition, improves the efficiency of air-conditioner set research and development and troubleshooting, and accuracy in detection is high.It is another object of the present invention to provide one
Plant the Properties of Air-conditioning Unit online detection instrument that accuracy in detection is high, easy to use, saves the set-up time, improve operating efficiency.
In order to achieve the above object, the technical scheme is that：A kind of Properties of Air-conditioning Unit is online
Detection method, it is characterised in that：Comprise the following steps：
The first step, the existing temperature and pressure on water and refrigerant-enthalpy list is stored in database, to build
Water enthalpy database and refrigerant enthalpy Value Data storehouse；
Second step, testing equipment is connected on tested air-conditioner set；Start tested air-conditioner set and testing equipment；
The test data of the tested air-conditioner set of collection within a period of time, test data includes water inlet temperature T1, water inlet pressure
p1, water volume flow rate V, water density ρ, water outlet temperature T2, water out pressure p2, refrigerant inlet temperature T3, refrigerant inlet pressure
Power p3, refrigerant mass fluxes m, refrigerant exit temperature T4With refrigerant outlet pressure p4；
3rd step, number attribute is converted into by test data using the unification of GRI algorithms；Temperature model is chosen according to test data
Enclose and pressure limit；The temperature range and pressure limit are chosen respectively in water enthalpy database and refrigerant enthalpy Value Data storehouse
The enthalpy data of interior water and the enthalpy data of refrigerant；
4th step, the enthalpy data of enthalpy data and refrigerant to water are respectively adopted linear fit mode and obtain water enthalpy
Equation of linear regression group and refrigerant enthalpy equation of linear regression group, water enthalpy equation of linear regression group and refrigerant enthalpy are linear
The independent variable of regression equation group is temperature and pressure, and dependent variable is enthalpy；Using exponential smoothing respectively to water enthalpy line
Property regression equation group and refrigerant enthalpy equation of linear regression group are optimized；
5th step, judges whether water enthalpy equation of linear regression group and refrigerant enthalpy equation of linear regression group meet essence
Degree is required：The 6th step is skipped to if meeting；Otherwise to not meeting the water enthalpy equation of linear regression group and/or refrigeration of required precision
Agent enthalpy equation of linear regression group is fitted and obtains new water enthalpy equation of linear regression again using another linear fit mode
Group and/or refrigerant enthalpy equation of linear regression group, and optimized using exponential smoothing, until meeting required precision；
6th step, water inlet enthalpy is calculated using water enthalpy equation of linear regression group and refrigerant enthalpy equation of linear regression group
Value h1, water out enthalpy h2, refrigerant inlet enthalpy h3With refrigerant outlet enthalpy h4；By water inlet enthalpy h1With water out enthalpy
h2It is stored into water enthalpy database, by refrigerant inlet enthalpy h3With refrigerant outlet enthalpy h4It is stored into refrigerant enthalpy number
According in storehouse；
Calculate heat transfer in water side Q, refrigerant side heat exchange amount Q ' and heat exchange ratio R：
Q=ρ×V×(|h1-h2|)；
Q'=m×(|h3-h4|)；
Wherein, ρIt is the average of water density ρ, VIt is the average of water volume flow rate V；mIt is equal for refrigerant mass fluxes m
Value；
Judge the size of heat exchange ratio R and pre-set ratio threshold value：If R ＜ pre-set ratio threshold values, tested air-conditioning is judged
Unit is qualified, otherwise judges tested air-conditioner set as unqualified.
Preferably, in the 3rd step, temperature range and pressure limit are chosen according to test data；In water enthalpy data
The enthalpy data and refrigerant of water in the temperature range and pressure limit are chosen in storehouse and refrigerant enthalpy Value Data storehouse respectively
Enthalpy data, refer to：
Search water inlet temperature T1With water outlet temperature T2Maximum MAX in two groups of test datasWater temperatureAnd minimum value
MINWater temperature；Search water inlet pressure p1With water out pressure p2Maximum MAX in two groups of test datasHydraulic pressureAnd minimum value MINHydraulic pressure；
Search refrigerant inlet temperature T3With refrigerant exit temperature T4Maximum MAX in two groups of test datasRefrigerant temperatureAnd minimum value
MINRefrigerant temperature；Search refrigerant inlet pressure p3With refrigerant outlet pressure p4Maximum MAX in two groups of test datasRefrigerant pressure
And minimum value MINRefrigerant pressure；Set water temperature degree scope is [MINWater temperature,MAXWater temperature], water pressure scope is [MINHydraulic pressure、MAXHydraulic pressure], refrigeration
Agent temperature range is [MINRefrigerant temperature、MAXRefrigerant temperature], refrigerant pressure scope is [MINRefrigerant pressure、MAXRefrigerant pressure]；In water enthalpy
The enthalpy of temperature is in the range of coolant-temperature gage and pressure is in the range of water pressure all enthalpy data as water is chosen in database
Data；Temperature is in the range of refrigerant temperature and pressure is in the range of refrigerant pressure for selection in refrigerant enthalpy Value Data storehouse
All enthalpy data as refrigerant enthalpy data.
Preferably, in the 5th step, judge whether water enthalpy equation of linear regression group meets required precision, refer to：
The enthalpy data of the water are divided into three parts using K- folding cross-validation methods；Wherein two numbers are linear according to water enthalpy is substituted into respectively
Enter the optimization of water-filling enthalpy equation of linear regression group in regression equation group；The water enthalpy that remaining portion data are substituted into after optimization is linear
Regression equation group digital simulation goodness, judges whether water enthalpy equation of linear regression group is equal by judging the size of the goodness of fit
Meet required precision；
Judge whether refrigerant enthalpy equation of linear regression group meets required precision, refer to：Cross-validation method is rolled over using K-
The enthalpy data of the refrigerant are divided into three parts；By wherein two numbers according to substitution refrigerant enthalpy equation of linear regression group respectively
In carry out refrigerant enthalpy equation of linear regression group optimization；The refrigerant enthalpy that remaining portion data are substituted into after optimization is linearly returned
Return equation group digital simulation goodness, refrigerant enthalpy equation of linear regression group is judged by judging the size of the goodness of fit whether
Meet required precision.
Preferably, in the 6th step, using water enthalpy equation of linear regression group and refrigerant enthalpy linear regression side
Journey group calculates water inlet enthalpy h1, water out enthalpy h2, refrigerant inlet enthalpy h3With refrigerant outlet enthalpy h4, refer to：By water
Inlet temperature T1With water inlet pressure p1Water enthalpy equation of linear regression group is substituted into, water inlet enthalpy h is drawn1；By water outlet temperature
T2With water out pressure p2Water enthalpy equation of linear regression group is substituted into, water out enthalpy h is drawn2；By refrigerant inlet temperature T3With
Refrigerant inlet pressure p3Refrigerant enthalpy equation of linear regression group is substituted into, refrigerant inlet enthalpy h is drawn3；By refrigerant outlet
Temperature T4With refrigerant outlet pressure p4Refrigerant enthalpy equation of linear regression group is substituted into, refrigerant outlet enthalpy h is drawn4。
Preferably, the water inlet temperature T1With water inlet pressure p1Respectively by being arranged on the cold of tested air-conditioner set
Temperature sensor and pressure sensor measurement inside condenser water tank water intake side ducts is obtained；The water outlet temperature T2Go out with water
Mouth pressure p2Respectively by be arranged on temperature sensor inside the condenser tank water outlet side ducts of tested air-conditioner set and
Pressure sensor measurement is obtained；The refrigerant inlet temperature T3With refrigerant inlet pressure p3It is tested by being arranged on respectively
Temperature sensor and pressure sensor measurement inside the condenser coil input pipeline of air-conditioner set is obtained；The refrigerant
Outlet temperature T4With refrigerant outlet pressure p4Respectively by being arranged on the condenser coil pipeline at output of tested air-conditioner set
Internal temperature sensor and pressure sensor measurement is obtained.
A kind of Properties of Air-conditioning Unit online detection instrument, includes successively for connecting with testing air conditioner unit, air-conditioner set
The evaporator of connection, compressor, condenser and choke valve；It is characterized in that：Including data collecting instrument, and and data collecting instrument
Electromagnetic flowmeter, mass flowmenter and main frame that signal is connected；The mass flowmenter respectively with condenser coil and choke valve
Connection, to measure refrigerant mass fluxes；The electromagnetic flowmeter is connected with condenser tank water inlet end and water side respectively, with
Measurement water volume flow rate and water density；Between compressor and condenser coil, between mass flowmenter and condenser coil, electromagnetism
Pass through respectively between flowmeter and the water inlet end of condenser tank and between electromagnetic flowmeter and the water side of condenser tank
Pipeline is connected；Each pipeline includes pipeline body and test pipeline section respectively；
The test pipeline section includes body, temperature sensor and pressure sensor that two ends are connected with pipeline body respectively；
The temperature sensor is arranged in body tube chamber；Pressure sensor is L-type Pitot tube；The Measurement portion of L-type Pitot tube is along body
Length direction is set, and L-type Pitot tube Measurement portion head end towards direction of flow.
Preferably, the temperature sensor includes temperature sensor one, temperature sensor two and temperature sensor three；It is described
Temperature sensor one and temperature sensor two are separately positioned on inboard wall of tube body；Temperature sensor three is arranged on body middle part.
Preferably, the Measurement portion of the temperature sensor one, temperature sensor two, temperature sensor three and L-type Pitot tube
Head end is located on same body cross section.
Preferably, also including wireless communication unit；The data collecting instrument is connected by wireless communication unit with host signal
Connect.
Compared with prior art, the invention has the advantages that and beneficial effect：
1st, the inventive method can realize Properties of Air-conditioning Unit on-line checking, when test data occurs abnormal can rapidly by
Situation is fed back, and technical staff can take suitable solution according to feedback data, improves at air-conditioner set research and development and failure
The efficiency of reason；
2nd, the test data that the inventive method will be collected in a period of time takes into full account air-conditioner set as analysis foundation
Dynamic parameter during on-line operation；Compared with conventionally employed lookup table mode obtains enthalpy, the inventive method is obtained using fit approach
Water enthalpy equation of linear regression group and refrigerant enthalpy equation of linear regression group is obtained to calculate water inlet enthalpy h1, water out enthalpy
h2, refrigerant inlet enthalpy h3With refrigerant outlet enthalpy h4, it is possible to reduce it is secondary that the enthalpy measuring carried out in laboratory is tested
Number, it is also possible to make up the not enough defect of experimental data；Existing enthalpy is chosen according to the extreme value that obtains of test to be fitted, obtain
Water enthalpy equation of linear regression group and refrigerant enthalpy equation of linear regression group it is higher with the goodness of fit of this test data, meter
The enthalpy for calculating is more accurate, so as to improve the degree of accuracy of Properties of Air-conditioning Unit detection；
3rd, the water inlet enthalpy h that the inventive method will be calculated newly1, water out enthalpy h2, refrigerant inlet enthalpy h3With
Refrigerant outlet enthalpy h4And its corresponding temperature and pressure is stored into water enthalpy database and refrigerant enthalpy Value Data storehouse, can
Many accurate reference datas are provided with for enthalpy calculating next time；With water enthalpy database and refrigerant enthalpy Value Data storehouse
Use time increase, more accurate enthalpy data can be accumulated so that the enthalpy data of reckoning are more accurate more reliable；
4th, present device can realize Properties of Air-conditioning Unit on-line checking, when test data occurs abnormal can rapidly by
Situation is fed back, and technical staff can take suitable solution according to feedback data, improves unit research and development and troubleshooting
Efficiency；Temperature sensor and pressure sensor are respectively provided with the duct, and the temperature and pressure in pipeline is detected respectively, can avoid wall
The error that temperature measurement method and static pressure measurement method are brought；Temperature sensor and pressure sensor are set using test pipeline section, can be improved
Degree easy to use, saves the set-up time of testing equipment and air-conditioner set, improves operating efficiency；
5th, in present device, three temperature measuring points are arranged in body, takes into full account Temperature Distribution in body not
Uniformity, improves the precision of measured value；
6th, present device is realized reliable and stable between data collecting instrument and main frame from wireless communication unit principal and subordinate's module
Wireless data real-time Transmission.
Brief description of the drawings
Fig. 1 is the flow chart of the inventive method；
Fig. 2 is the detection principle diagram of the inventive method；
Fig. 3 is the structural representation of testing equipment of the present invention；
Fig. 4 is the structural representation of test pipeline section in testing equipment of the present invention；
Wherein, 1 be air-conditioner set, 11 be evaporator, 12 be compressor, 13 be condenser, 14 be choke valve, 2 for detection
Equipment, 21 be electromagnetic flowmeter, 22 be mass flowmenter, 23 be data collecting instrument, 24 be main frame, 3 be pipeline, 31 be testing tube
Section, 311 be body, 312 be temperature sensor one, 313 be temperature sensor two, 314 be temperature sensor three, 315 be pressure
Sensor.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment one
As depicted in figs. 1 and 2, the present embodiment provides a kind of Properties of Air-conditioning Unit online test method, it is characterised in that：Bag
Include following steps：
The first step, the existing temperature and pressure on water and refrigerant-enthalpy list is stored in database, to build
Water enthalpy database and refrigerant enthalpy Value Data storehouse；The existing temperature and pressure on water and refrigerant-enthalpy list is from research
The interpretation of the authoritative institutions such as institute, colleges and universities is obtained；
Second step, testing equipment is connected on tested air-conditioner set；Start tested air-conditioner set and testing equipment；
The test data of the tested air-conditioner set of testing equipment collection within a period of time, test data includes water inlet temperature T1, water
Inlet pressure p1, water volume flow rate V, water density ρ, water outlet temperature T2, water out pressure p2, refrigerant inlet temperature T3, refrigeration
Agent inlet pressure p3, refrigerant mass fluxes m, refrigerant exit temperature T4With refrigerant outlet pressure p4；
3rd step, number attribute is converted into by test data using the unification of GRI algorithms；Temperature model is chosen according to test data
Enclose and pressure limit；The temperature range and pressure limit are chosen respectively in water enthalpy database and refrigerant enthalpy Value Data storehouse
The enthalpy data of interior water and the enthalpy data of refrigerant；
4th step, the enthalpy data of enthalpy data and refrigerant to water are respectively adopted linear fit mode and obtain water enthalpy
Equation of linear regression group and refrigerant enthalpy equation of linear regression group, water enthalpy equation of linear regression group and refrigerant enthalpy are linear
The independent variable of regression equation group is temperature and pressure, and dependent variable is enthalpy；Using exponential smoothing respectively to water enthalpy line
Property regression equation group and refrigerant enthalpy equation of linear regression group are optimized；
5th step, judges whether water enthalpy equation of linear regression group and refrigerant enthalpy equation of linear regression group meet essence
Degree is required：The 6th step is skipped to if meeting；Otherwise to not meeting the water enthalpy equation of linear regression group and/or refrigeration of required precision
Agent enthalpy equation of linear regression group is fitted and obtains new water enthalpy equation of linear regression again using another linear fit mode
Group and/or refrigerant enthalpy equation of linear regression group, and optimized using exponential smoothing, until meeting required precision；
6th step, water inlet enthalpy is calculated using water enthalpy equation of linear regression group and refrigerant enthalpy equation of linear regression group
Value h1, water out enthalpy h2, refrigerant inlet enthalpy h3With refrigerant outlet enthalpy h4；By water inlet enthalpy h1With water out enthalpy
h2It is stored into water enthalpy database, by refrigerant inlet enthalpy h3With refrigerant outlet enthalpy h4It is stored into refrigerant enthalpy number
According in storehouse；
Calculate heat transfer in water side Q, refrigerant side heat exchange amount Q ' and heat exchange ratio R：
Q=ρ×V×(|h1-h2|)；
Q'=m×(|h3-h4|)；
Wherein, ρIt is the average of water density ρ, VIt is the average of water volume flow rate V；mIt is equal for refrigerant mass fluxes m
Value；
Judge the size of heat exchange ratio R and pre-set ratio threshold value：If R ＜ pre-set ratio threshold values, tested air-conditioning is judged
Unit is qualified, otherwise judges tested air-conditioner set as unqualified.
Preferably, in the 3rd step, temperature range and pressure limit are chosen according to test data；In water enthalpy data
The enthalpy data and refrigerant of water in the temperature range and pressure limit are chosen in storehouse and refrigerant enthalpy Value Data storehouse respectively
Enthalpy data, refer to：
Search water inlet temperature T1With water outlet temperature T2Maximum MAX in two groups of test datasWater temperatureAnd minimum value
MINWater temperature；Search water inlet pressure p1With water out pressure p2Maximum MAX in two groups of test datasHydraulic pressureAnd minimum value MINHydraulic pressure；
Search refrigerant inlet temperature T3With refrigerant exit temperature T4Maximum MAX in two groups of test datasRefrigerant temperatureAnd minimum value
MINRefrigerant temperature；Search refrigerant inlet pressure p3With refrigerant outlet pressure p4Maximum MAX in two groups of test datasRefrigerant pressure
And minimum value MINRefrigerant pressure；Set water temperature degree scope is [MINWater temperature,MAXWater temperature], water pressure scope is [MINHydraulic pressure、MAXHydraulic pressure], refrigeration
Agent temperature range is [MINRefrigerant temperature、MAXRefrigerant temperature], refrigerant pressure scope is [MINRefrigerant pressure、MAXRefrigerant pressure]；In water enthalpy
The enthalpy of temperature is in the range of coolant-temperature gage and pressure is in the range of water pressure all enthalpy data as water is chosen in database
Data；Temperature is in the range of refrigerant temperature and pressure is in the range of refrigerant pressure for selection in refrigerant enthalpy Value Data storehouse
All enthalpy data as refrigerant enthalpy data.
Preferably, in the 5th step, judge whether water enthalpy equation of linear regression group meets required precision, refer to：
The enthalpy data that water is selected in the 3rd step are divided into three parts using K- folding cross-validation methods；By wherein two numbers according to generation respectively
To enter enter in water enthalpy equation of linear regression group the optimization of water-filling enthalpy equation of linear regression group；After remaining portion data are substituted into optimization
Water enthalpy equation of linear regression group digital simulation goodness, water enthalpy linear regression is judged by judging the size of the goodness of fit
Whether equation group meets required precision；
Judge whether refrigerant enthalpy equation of linear regression group meets required precision, refer to：Cross-validation method is rolled over using K-
The enthalpy data for carrying out refrigerant will be selected in 3rd step and is divided into three parts；By wherein two numbers according to substitution refrigerant enthalpy line respectively
Property regression equation group in carry out refrigerant enthalpy equation of linear regression group optimization；Remaining portion data are substituted into the refrigeration after optimization
Agent enthalpy equation of linear regression group digital simulation goodness, judges that refrigerant enthalpy is linearly returned by judging the size of the goodness of fit
Return whether equation group meets required precision.
Preferably, in the 6th step, using water enthalpy equation of linear regression group and refrigerant enthalpy linear regression side
Journey group calculates water inlet enthalpy h1, water out enthalpy h2, refrigerant inlet enthalpy h3With refrigerant outlet enthalpy h4, refer to：By water
Inlet temperature T1With water inlet pressure p1Water enthalpy equation of linear regression group is substituted into, water inlet enthalpy h is drawn1；By water outlet temperature
T2With water out pressure p2Water enthalpy equation of linear regression group is substituted into, water out enthalpy h is drawn2；By refrigerant inlet temperature T3With
Refrigerant inlet pressure p3Refrigerant enthalpy equation of linear regression group is substituted into, refrigerant inlet enthalpy h is drawn3；By refrigerant outlet
Temperature T4With refrigerant outlet pressure p4Refrigerant enthalpy equation of linear regression group is substituted into, refrigerant outlet enthalpy h is drawn4。
Preferably, the water inlet temperature T1With water inlet pressure p1Respectively by being arranged on the cold of tested air-conditioner set
Temperature sensor and pressure sensor measurement inside condenser water tank water intake side ducts is obtained；The water outlet temperature T2Go out with water
Mouth pressure p2Respectively by be arranged on temperature sensor inside the condenser tank water outlet side ducts of tested air-conditioner set and
Pressure sensor measurement is obtained；The refrigerant inlet temperature T3With refrigerant inlet pressure p3It is tested by being arranged on respectively
Temperature sensor and pressure sensor measurement inside the condenser coil input pipeline of air-conditioner set is obtained；The refrigerant
Outlet temperature T4With refrigerant outlet pressure p4Respectively by being arranged on the condenser coil pipeline at output of tested air-conditioner set
Internal temperature sensor and pressure sensor measurement is obtained.
The invention has the advantages that and beneficial effect：
1st, the inventive method can realize Properties of Air-conditioning Unit on-line checking, when test data occurs abnormal can rapidly by
Situation is fed back, and technical staff can take suitable solution according to feedback data, improves unit research and development and troubleshooting
Efficiency；
2nd, the test data that the inventive method will be collected in a period of time takes into full account air-conditioner set as analysis foundation
Dynamic parameter during on-line operation；Compared with conventionally employed lookup table mode obtains enthalpy, the inventive method is obtained using fit approach
Water enthalpy equation of linear regression group and refrigerant enthalpy equation of linear regression group is obtained to calculate water inlet enthalpy h1, water out enthalpy
h2, refrigerant inlet enthalpy h3With refrigerant outlet enthalpy h4, it is possible to reduce it is secondary that the enthalpy measuring carried out in laboratory is tested
Number, it is also possible to make up the not enough defect of experimental data；Existing enthalpy is chosen according to the extreme value that obtains of test to be fitted, obtain
Water enthalpy equation of linear regression group and refrigerant enthalpy equation of linear regression group it is higher with the goodness of fit of this test data, meter
The enthalpy for calculating is more accurate；
3rd, the water inlet enthalpy h that the inventive method will be calculated newly1, water out enthalpy h2, refrigerant inlet enthalpy h3With
Refrigerant outlet enthalpy h4And its corresponding temperature and pressure is stored into water enthalpy database and refrigerant enthalpy Value Data storehouse, can
Many accurate reference datas are provided with for enthalpy calculating next time；With water enthalpy database and refrigerant enthalpy Value Data storehouse
Use time increase, more accurate enthalpy data can be accumulated so that the enthalpy data of reckoning are more accurate more reliable.
Embodiment two
As shown in Figure 3 and Figure 4, the present embodiment provides a kind of Properties of Air-conditioning Unit online detection instrument, for connecting and surveying
Examination air-conditioner set, air-conditioner set includes the evaporator 11, compressor 12, condenser 13 and the choke valve 14 that are sequentially connected；Equipment bag
Data collecting instrument 23 is included, and electromagnetic flowmeter 21, mass flowmenter 22 and the main frame 24 being connected with the signal of data collecting instrument 23.
Data collecting instrument 23 can use available data Acquisition Instrument.The mass flowmenter 22 respectively with the coil pipe of condenser 13 and choke valve 14
Connection, to measure refrigerant mass fluxes；The electromagnetic flowmeter 21 connects with the water tank water intake end of condenser 13 and water side respectively
Connect, to measure water volume flow rate and water density；Between compressor 12 and the coil pipe of condenser 13, mass flowmenter 22 and condenser 13
Between coil pipe, between electromagnetic flowmeter 21 and the water inlet end of the water tank of condenser 13 and electromagnetic flowmeter 21 and the water tank of condenser 13
Water side between connected by pipeline 3 respectively；Each pipeline 3 includes pipeline body and test pipeline section 31 respectively.
The body 311, temperature sensor and pressure that the test pipeline section 31 is connected with pipeline body respectively including two ends are passed
Sensor 315；The temperature sensor is arranged in the tube chamber of body 311；Pressure sensor 315 is L-type Pitot tube；L-type Pitot tube
Measurement portion set along tube length direction, and L-type Pitot tube Measurement portion head end towards direction of flow.
It is connected to temperature sensor and pressure in the test pipeline section between electromagnetic flowmeter 21 and the water tank water intake end of condenser 13
Force snesor detects water inlet temperature T respectively1With water inlet pressure p1；Electromagnetic flowmeter 21 is connected to go out with the water tank of condenser 13
Temperature sensor and pressure sensor detect water outlet temperature T respectively in test pipeline section between water end (W.E.)2With water out pressure p2；
It is connected to temperature sensor and pressure sensor in the test pipeline section between compressor 12 and the coil pipe of condenser 13 and detects system respectively
Cryogen inlet temperature T3With refrigerant inlet pressure p3；It is connected to the testing tube between mass flowmenter 22 and the coil pipe of condenser 13
Temperature sensor and pressure sensor detect refrigerant exit temperature T respectively in section4With refrigerant outlet pressure p4.Mass flow
Count 22 detectable refrigerant mass flow m；Electromagnetic flowmeter 21 can detect water volume flow rate V and water density ρ.
Preferably, the temperature sensor includes temperature sensor 1, temperature sensor 2 313 and temperature sensor
3 314；The temperature sensor 1 and temperature sensor 2 313 are separately positioned on the inwall of body 311；Temperature sensor
3 315 are arranged on the middle part of body 311.
Preferably, the temperature sensor 1, temperature sensor 2 313, temperature sensor 3 314 and L-type Pitot tube
Measurement portion head end be located at same body cross section on.
Preferably, also including wireless communication unit；The data collecting instrument is connected by wireless communication unit with host signal
Connect.
Present device can realize Properties of Air-conditioning Unit on-line checking, can rapidly by feelings when test data occurs abnormal
Condition is fed back, and technical staff can take suitable solution according to feedback data, improves the effect of unit research and development and troubleshooting
Rate；Temperature sensor and pressure sensor are respectively provided with the duct, and the temperature and pressure in pipeline is detected respectively, can avoid wall temperature
The error that mensuration and static pressure measurement method are brought；Temperature sensor and pressure sensor are set using test pipeline section, can improve makes
Convenient degree is used, the set-up time of testing equipment and air-conditioner set is saved, operating efficiency is improved.
In present device, three temperature measuring points are arranged in body, take into full account the temperature distributing disproportionation in body
Even property, improves the precision of measured value；Present device realizes data collecting instrument and master from wireless communication unit principal and subordinate's module
Wireless data real-time Transmission reliable and stable between machine.
Above-described embodiment is the present invention preferably implementation method, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from Spirit Essence of the invention and the change, modification, replacement made under principle, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (9)
1. a kind of Properties of Air-conditioning Unit online test method, it is characterised in that：Comprise the following steps：
The first step, the existing temperature and pressure on water and refrigerant-enthalpy list is stored in database, to build water enthalpy
Value Data storehouse and refrigerant enthalpy Value Data storehouse；
Second step, testing equipment is connected on tested air-conditioner set；Start tested air-conditioner set and testing equipment；One
The test data of the tested air-conditioner set of collection in the section time, test data includes water inlet temperature T1, water inlet pressure p1, water
Volume flow V, water density ρ, water outlet temperature T2, water out pressure p2, refrigerant inlet temperature T3, refrigerant inlet pressure p3、
Refrigerant mass fluxes m, refrigerant exit temperature T4With refrigerant outlet pressure p4；
3rd step, number attribute is converted into by test data using the unification of GRI algorithms；According to test data choose temperature range and
Pressure limit；Water in the temperature range and pressure limit is chosen respectively in water enthalpy database and refrigerant enthalpy Value Data storehouse
Enthalpy data and refrigerant enthalpy data；
4th step, the enthalpy data of enthalpy data and refrigerant to water are respectively adopted linear fit mode, and to obtain water enthalpy linear
Regression equation group and refrigerant enthalpy equation of linear regression group, water enthalpy equation of linear regression group and refrigerant enthalpy linear regression
The independent variable of equation group is temperature and pressure, and dependent variable is enthalpy；Water enthalpy is linearly returned respectively using exponential smoothing
Equation group and refrigerant enthalpy equation of linear regression group is returned to optimize；
5th step, judges whether water enthalpy equation of linear regression group and refrigerant enthalpy equation of linear regression group meet precision and want
Ask：The 6th step is skipped to if meeting；Otherwise to not meeting the water enthalpy equation of linear regression group and/or refrigerant enthalpy of required precision
Value equation of linear regression group be fitted again using another linear fit mode obtain new water enthalpy equation of linear regression group and/
Or refrigerant enthalpy equation of linear regression group, and optimized using exponential smoothing, until meeting required precision；
6th step, water inlet enthalpy h is calculated using water enthalpy equation of linear regression group and refrigerant enthalpy equation of linear regression group1、
Water out enthalpy h2, refrigerant inlet enthalpy h3With refrigerant outlet enthalpy h4；By water inlet enthalpy h1With water out enthalpy h2Storage
It is stored in water enthalpy database, by refrigerant inlet enthalpy h3With refrigerant outlet enthalpy h4It is stored into refrigerant enthalpy Value Data storehouse
In；
Calculate heat transfer in water side Q, refrigerant side heat exchange amount Q ' and heat exchange ratio R：
Q=ρ ×V ×(|h1-h2|)；
Q'=m ×(|h3-h4|)；
Wherein, ρ It is the average of water density ρ, V It is the average of water volume flow rate V；m It is the average of refrigerant mass fluxes m；
Judge the size of heat exchange ratio R and pre-set ratio threshold value：If R ＜ pre-set ratio threshold values, tested air-conditioner set is judged
For qualified, otherwise judge tested air-conditioner set as unqualified.
2. Properties of Air-conditioning Unit online test method according to claim 1, it is characterised in that：In the 3rd step,
Temperature range and pressure limit are chosen according to test data；Chosen respectively in water enthalpy database and refrigerant enthalpy Value Data storehouse
The enthalpy data of the enthalpy data of water and refrigerant in the temperature range and pressure limit, refer to：
Search water inlet temperature T1With water outlet temperature T2Maximum MAX in two groups of test datasWater temperatureAnd minimum value MINWater temperature；Look into
Water detection inlet pressure p1With water out pressure p2Maximum MAX in two groups of test datasHydraulic pressureAnd minimum value MINHydraulic pressure；Search refrigeration
Agent inlet temperature T3With refrigerant exit temperature T4Maximum MAX in two groups of test datasRefrigerant temperatureAnd minimum value MINRefrigerant temperature；
Search refrigerant inlet pressure p3With refrigerant outlet pressure p4Maximum MAX in two groups of test datasRefrigerant pressureAnd minimum value
MINRefrigerant pressure；Set water temperature degree scope is [MINWater temperature,MAXWater temperature], water pressure scope is [MINHydraulic pressure、MAXHydraulic pressure], refrigerant temperature model
It is [MIN to encloseRefrigerant temperature、MAXRefrigerant temperature], refrigerant pressure scope is [MINRefrigerant pressure、MAXRefrigerant pressure]；In water enthalpy database
Choose the enthalpy data of temperature is in the range of coolant-temperature gage and pressure is in the range of water pressure all enthalpy data as water；In system
All enthalpies that temperature is in the range of refrigerant temperature and pressure is in the range of refrigerant pressure are chosen in cryogen enthalpy database
Data as refrigerant enthalpy data.
3. Properties of Air-conditioning Unit online test method according to claim 1, it is characterised in that：In the 5th step,
Judge whether water enthalpy equation of linear regression group meets required precision, refer to：Cross-validation method is rolled over by the enthalpy of the water using K-
Value Data is divided into three parts；By wherein two numbers according to respectively substitute into water enthalpy equation of linear regression group in enter water-filling enthalpy linear regression
Equation group optimizes；Remaining portion data are substituted into the water enthalpy equation of linear regression group digital simulation goodness after optimization, by sentencing
The size of the disconnected goodness of fit judges whether water enthalpy equation of linear regression group meets required precision；
Judge whether refrigerant enthalpy equation of linear regression group meets required precision, refer to：Cross-validation method is rolled over by institute using K-
The enthalpy data for stating refrigerant are divided into three parts；By wherein two numbers according to respectively substitute into refrigerant enthalpy equation of linear regression group in enter
Row refrigerant enthalpy equation of linear regression group optimizes；Remaining portion data are substituted into the refrigerant enthalpy linear regression side after optimization
Journey group digital simulation goodness, judges whether refrigerant enthalpy equation of linear regression group accords with by judging the size of the goodness of fit
Close required precision.
4. Properties of Air-conditioning Unit online test method according to claim 1, it is characterised in that：In the 6th step,
Water inlet enthalpy h is calculated using water enthalpy equation of linear regression group and refrigerant enthalpy equation of linear regression group1, water out enthalpy
h2, refrigerant inlet enthalpy h3With refrigerant outlet enthalpy h4, refer to：By water inlet temperature T1With water inlet pressure p1Substitute into water enthalpy
Value equation of linear regression group, draws water inlet enthalpy h1；By water outlet temperature T2With water out pressure p2Water enthalpy is substituted into linearly to return
Return equation group, draw water out enthalpy h2；By refrigerant inlet temperature T3With refrigerant inlet pressure p3Substitute into refrigerant enthalpy line
Property regression equation group, draws refrigerant inlet enthalpy h3；By refrigerant exit temperature T4With refrigerant outlet pressure p4Substitute into refrigeration
Agent enthalpy equation of linear regression group, draws refrigerant outlet enthalpy h4。
5. Properties of Air-conditioning Unit online test method according to claim 1, it is characterised in that：The water inlet temperature T1
With water inlet pressure p1Passed by being arranged on the temperature inside the condenser tank of tested air-conditioner set water inlet side ducts respectively
Sensor and pressure sensor measurement are obtained；The water outlet temperature T2With water out pressure p2Respectively by being arranged on tested sky
The temperature sensor and pressure sensor measurement inside the condenser tank water outlet side ducts of unit is adjusted to obtain；The refrigerant enters
Mouth temperature T3With refrigerant inlet pressure p3Respectively by being arranged in the condenser coil input pipeline of tested air-conditioner set
The temperature sensor and pressure sensor measurement in portion is obtained；The refrigerant exit temperature T4With refrigerant outlet pressure p4Respectively
Surveyed by being arranged on the temperature sensor and pressure sensor inside the condenser coil pipeline at output of tested air-conditioner set
Amount is obtained.
6. a kind of Properties of Air-conditioning Unit online detection instrument, includes connecting successively for connecting with testing air conditioner unit, air-conditioner set
Evaporator, compressor, condenser and the choke valve for connecing；It is characterized in that：Including data collecting instrument, and believe with data collecting instrument
Electromagnetic flowmeter, mass flowmenter and the main frame of number connection；The mass flowmenter connects with condenser coil and choke valve respectively
Connect, to measure refrigerant mass fluxes；The electromagnetic flowmeter is connected with condenser tank water inlet end and water side respectively, to survey
Amount water volume flow rate and water density；Between compressor and condenser coil, between mass flowmenter and condenser coil, electromagnetic current
Pass through pipe between gauge and the water inlet end of condenser tank and between electromagnetic flowmeter and the water side of condenser tank respectively
Road is connected；Each pipeline includes pipeline body and test pipeline section respectively；
The test pipeline section includes body, temperature sensor and pressure sensor that two ends are connected with pipeline body respectively；It is described
Temperature sensor is arranged in body tube chamber；Pressure sensor is L-type Pitot tube；The Measurement portion of L-type Pitot tube is along tube length
Direction is set, and L-type Pitot tube Measurement portion head end towards direction of flow.
7. Properties of Air-conditioning Unit online detection instrument according to claim 6, it is characterised in that：The temperature sensor bag
Include temperature sensor one, temperature sensor two and temperature sensor three；The temperature sensor one and temperature sensor two are distinguished
It is arranged on inboard wall of tube body；Temperature sensor three is arranged on body middle part.
8. Properties of Air-conditioning Unit online detection instrument according to claim 7, it is characterised in that：The temperature sensor
First, the Measurement portion head end of temperature sensor two, temperature sensor three and L-type Pitot tube is located on same body cross section.
9. Properties of Air-conditioning Unit online detection instrument according to claim 6, it is characterised in that：Also include radio communication list
Unit；The data collecting instrument is connected by wireless communication unit with host signal.
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