CN109030055B - CO2Performance test system and test method for air conditioner heat exchanger - Google Patents
CO2Performance test system and test method for air conditioner heat exchanger Download PDFInfo
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- CN109030055B CN109030055B CN201810971944.1A CN201810971944A CN109030055B CN 109030055 B CN109030055 B CN 109030055B CN 201810971944 A CN201810971944 A CN 201810971944A CN 109030055 B CN109030055 B CN 109030055B
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- 238000012360 testing method Methods 0.000 title claims abstract description 76
- 238000010998 test method Methods 0.000 title description 3
- 230000001105 regulatory effect Effects 0.000 claims abstract description 173
- 238000004378 air conditioning Methods 0.000 claims abstract description 45
- 238000011056 performance test Methods 0.000 claims abstract description 43
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 239000003507 refrigerant Substances 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 65
- 239000000498 cooling water Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 11
- 230000007613 environmental effect Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 abstract description 6
- 238000009530 blood pressure measurement Methods 0.000 description 11
- 238000009529 body temperature measurement Methods 0.000 description 9
- 238000001816 cooling Methods 0.000 description 6
- 238000005057 refrigeration Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
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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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- G01M99/002—Thermal testing
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Abstract
The invention discloses a performance test system of a CO 2 air-conditioning heat exchanger, which comprises the following components: the system comprises a compressor, an auxiliary condenser, a flowmeter, first to eleventh regulating valves, an auxiliary evaporator, a gas-liquid separator, a calorimeter, a superheater and first to fifth temperature and pressure measuring points; the combination of opening and closing of the regulating valve forms a test loop with different test modes of the CO 2 condenser and the CO 2 evaporator. The invention also discloses a performance test method of the CO 2 air-conditioning heat exchanger. According to the invention, by controlling the working states of all the components in the test system, the temperature and the pressure of the high-pressure outlet and the low-pressure outlet of the tested CO 2 heat exchanger and the flow of the tested CO 2 heat exchanger can be always kept under the test condition, so that whether the performance of the tested CO 2 heat exchanger meets the requirements or not can be accurately monitored; the test conditions and the test objects can be switched through the arrangement and the switching of the valve and the position change of the measuring point, and the flow direction of the refrigerant in the pipeline can be changed according to the need on the basis of not increasing the hardware cost, so that the function of testing the CO 2 air-conditioning heat exchanger is realized.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a test system adopting CO 2 as a refrigerant air conditioner heat exchanger. The invention also relates to a test method for the heat exchanger of the air conditioner by adopting the CO 2 as the refrigerant.
Background
Compared with the traditional refrigerant, the CO 2 has the obvious advantages of environmental protection, no toxicity, economy, unit volume refrigerating capacity and other performance aspects, and the safety and reliability of the CO 2 refrigerant system running under the transcritical pressure can be ensured as long as the compression strength of the air conditioning system is reasonably designed, the performance of the heat exchanger is improved, and the circulation efficiency of the system is improved. CO 2 is used as one of environment-friendly refrigerants, has good application prospect, and can be widely applied along with the development of the technical fields of refrigeration and air conditioning.
Because the CO 2 refrigerating system is affected by temperature fluctuation, start-stop circulation, heat pump defrosting and other factors in actual operation, the internal pressure of the refrigerating system is frequently alternated, so that in order to meet the test requirement of a heat exchanger used in the CO 2 air conditioning system, a safe and reliable test device is urgently needed to test the performance of the heat exchanger at present.
Disclosure of Invention
The invention aims to provide a CO 2 air-conditioning heat exchanger performance test system capable of accurately controlling test conditions and monitoring performance parameters of a tested CO 2 heat exchanger. The invention also provides a performance test method of the CO 2 air-conditioning heat exchanger, which can accurately control the test conditions and monitor the performance parameters of the tested CO 2 heat exchanger.
In order to solve the technical problems, the performance test system for the CO 2 air-conditioning heat exchanger provided by the invention comprises: the system comprises a compressor 1, an auxiliary condenser 2, a flowmeter 3, first to eleventh regulating valves 4 to 14, an auxiliary evaporator 15, a gas-liquid separator 16, a calorimeter 17, a superheater 18 and first to fifth temperature and pressure measuring points 19 to 23;
The compressor 1 is respectively connected with the first ends of the auxiliary condenser 2, the gas-liquid separator 16, the calorimeter 17 and the superheater 18, the second end of the auxiliary condenser 2 is respectively connected with the first ends of the flowmeter 3, the auxiliary evaporator 15 and the detected heat exchanger A, the second end of the auxiliary evaporator 15 is connected with the second end of the gas-liquid separator 16, the first end of the detected heat exchanger A is respectively connected with the first end of the auxiliary evaporator 15 and the second end of the flowmeter 3, and the second end of the detected heat exchanger A is respectively connected with the second end of the calorimeter 17 and the second end of the superheater 18;
The first regulating valve 4 is arranged on a pipeline between the second end of the auxiliary condenser 2 and the first end of the flowmeter 3, the second regulating valve 5 and the third regulating valve 6 are connected in parallel on a pipeline between the second end of the auxiliary condenser 2 and the first end of the auxiliary evaporator 15, the fourth regulating valve 7 and the fifth regulating valve 8 are connected in parallel and then are connected in series with the sixth regulating valve 9 to be arranged between the second end of the flowmeter 3 and the first end of the heat exchanger A to be tested, the seventh regulating valve 10 and the sixth regulating valve 9 are connected in series and are arranged between the first end of the auxiliary evaporator 15 and the first end of the heat exchanger A to be tested, the first regulating valve 4 and the eighth regulating valve 11 are connected in series and are arranged between the second end of the auxiliary condenser 2 and the first end of the heat exchanger A to be tested, the ninth regulating valve 12 is arranged between the first end of the compressor 1 and the first end of the calorimeter 17, the tenth regulating valve 13 is arranged between the second end of the calorimeter 17 and the second end of the heat exchanger A to be tested, and the eleventh regulating valve 14 is arranged between the second end of the superheater 18 and the second end of the heat exchanger A to be tested;
The first temperature and pressure measuring point 19 is arranged between the sixth regulating valve 9 and the first end of the measured heat exchanger A, the second temperature and pressure measuring point 20 is arranged between the tenth regulating valve 13 and the second end of the measured heat exchanger A, the third temperature and pressure measuring point 21 is arranged between the fourth control valve 7 and the second end of the flowmeter 3, the fourth temperature and pressure measuring point 22 is arranged between the second end of the compressor 1 and the first end of the gas-liquid separator 16, and the fifth temperature and pressure measuring point 23 is arranged between the ninth control valve 12 and the first end of the calorimeter 17.
Further improving the performance test system of the CO 2 air-conditioning heat exchanger, the first temperature and pressure measuring point 19 is arranged on a pipeline close to the first end of the measured heat exchanger A, the second temperature and pressure measuring point 20 is arranged on a pipeline close to the second end of the measured heat exchanger A, the fourth temperature and pressure measuring point 22 is arranged on a pipeline close to the first end of the gas-liquid separator 16, and the fifth temperature and pressure measuring point 23 is arranged on a pipeline close to the first end of the calorimeter 17.
The performance test system of the CO 2 air-conditioning heat exchanger is further improved and is divided into a CO 2 condenser test mode and a CO 2 evaporator test mode.
The performance test system of the CO 2 air-conditioning heat exchanger is further improved, and when the system executes the CO 2 condenser test mode, the first control valve 4, the sixth control valve 9 and the tenth control valve 13 are closed to form a CO 2 condenser test loop.
Further improving the performance test system of the CO 2 air-conditioning heat exchanger, when the system executes the CO 2 evaporator test mode, the seventh control valve 10, the eighth control valve 11 and the eleventh control valve 14 are closed to form a CO 2 evaporator test loop.
Further improve CO 2 air conditioner heat exchanger performance test system still includes: a cooling water circulation unit including a constant temperature water tank 30, a circulation water pump 31, and first to fourth water flow rate adjustment valves 32 to 34;
The constant temperature water tank 30 is connected with the auxiliary condenser 2, the auxiliary evaporator 15 and the gas-liquid separator 16 respectively through a water outlet pipeline and a water return pipeline, a circulating water pump 31 is arranged on the water outlet pipeline of the constant temperature water tank 30, a first water flow regulating valve 32 is arranged on the water return pipeline of the constant temperature water tank 30 connected with the auxiliary condenser 2, a second water flow regulating valve 33 is arranged on the water return pipeline of the constant temperature water tank 30 connected with the auxiliary evaporator 15, and a third water flow regulating valve 34 is arranged on the water return pipeline of the constant temperature water tank 30 connected with the gas-liquid separator 16.
Further improve CO 2 air conditioner heat exchanger performance test system still includes: the thermostatic chamber 25, the measured heat exchanger a, the tenth control valve 13, the eleventh control valve 14, the first temperature pressure measurement point 19, and the second temperature pressure measurement point 20 are disposed in the thermostatic chamber 25.
Further improving the performance test system of the CO 2 air-conditioning heat exchanger, wherein the thermostatic chamber 25 comprises an air volume measuring device 24, an air-conditioning cabinet 26, a refrigeration coil 27, an air-conditioning cabinet circulating fan 28 and a humidifier 29;
The air volume measuring device 24 is connected to an air outlet of the tested heat exchanger A, and the air conditioning cabinet 26, the refrigerating coil 27 and the humidifier 29 are arranged in the thermostatic chamber 25. The air conditioning cabinet 26 and the refrigerating coil 27 control the temperature of the thermostatic chamber 25, the humidifier 29 controls the humidity of the thermostatic chamber 25, the tested heat exchanger A is arranged at an air outlet of the air conditioning cabinet of the environmental chamber, the refrigerating coil 27 is arranged beside the air conditioning cabinet 26, and the air conditioning cabinet circulating fan 28 is arranged beside the refrigerating coil 27.
The cooling water circulation unit ensures that the operation states of the auxiliary condenser 2, the auxiliary evaporator 15 and the gas-liquid separator 16 are stable. The thermostatic chamber 25 ensures that the temperature and humidity state of the air inlet of the heat exchanger A to be tested are stable.
Further improving the performance test system of the CO 2 air-conditioning heat exchanger, the first control valve 4, the sixth control valve 9, the seventh control valve 10, the eighth control valve 11, the tenth control valve 13 and the eleventh control valve 14 are ball valves, and the second control valve 5, the third control valve 6, the fourth control valve 7, the fifth control valve 8 and the ninth control valve 12 are electric expansion valves.
The performance test system of the CO 2 air-conditioning heat exchanger is further improved, and the compressor 1 is a variable-speed compressor or a variable-frequency compressor.
Further improving the performance test system of the CO 2 air-conditioning heat exchanger, the auxiliary condenser 2 and the auxiliary evaporator 15 are sleeve heat exchangers.
Further improving the performance test system of the CO 2 air-conditioning heat exchanger, the superheater 18 is a plate heat exchanger.
The invention provides a method for executing performance test of a CO 2 air conditioner heat exchanger by utilizing the performance test system of the CO 2 air conditioner heat exchanger, which comprises the following steps:
closing the seventh control valve 10, the eighth control valve 11 and the eleventh control valve 14 to form a CO2 evaporator test loop;
Starting the compressor 1 to enable the refrigerant to flow in the CO 2 evaporator test loop;
The cooling water quantity of the auxiliary condenser 2 and the auxiliary evaporator 15, the heating oil quantity of the superheater 18, the opening degree of the second regulating valve 5 and the fourth regulating valve 7 and the input power of the calorimeter 17 are regulated and controlled by one or a combination of more than one of the opening degrees, so that the temperature and the pressure of the refrigerant at the inlet and the outlet of the tested sample meet the test condition;
the flow rate of the refrigerant flowing through the sample to be measured is controlled by the rotation speed or frequency of the compressor 1, or the opening degrees of the third control valve 6 and the fifth control valve 8.
The performance test method for the CO 2 air-conditioning heat exchanger is further improved and comprises the following steps of:
Closing the seventh control valve 10, the eighth control valve 11 and the eleventh control valve 14 to form a CO 2 evaporator test loop;
starting the compressor 1 to enable the refrigerant to flow in the CO2 evaporator test loop;
The cooling water quantity of the auxiliary condenser 2 and the auxiliary evaporator 15, the heating oil quantity of the superheater 18, the opening degree of the second regulating valve 5 and the fourth regulating valve 7 and the input power of the calorimeter 17 are regulated and controlled by one or a combination of more than one of the opening degrees, so that the temperature and the pressure of the refrigerant at the inlet and the outlet of the tested sample meet the test condition; and, the flow rate of the refrigerant flowing through the sample to be measured is controlled by the rotation speed or frequency of the compressor 1, or the opening degrees of the third control valve 6 and the fifth control valve 8.
The performance test system for the CO 2 air-conditioning heat exchanger can realize a CO 2 condenser test mode and a CO 2 evaporator test mode according to test requirements.
In the CO 2 condenser test mode, the high pressure inlet of the tested CO 2 condenser is connected to the outlet of the superheater 18 and the high pressure outlet is connected to the inlet of the flow meter 3. The high pressure inlet temperature and pressure measurement point of the measured CO 2 condenser is located between the outlet of the superheater 18 and the high pressure inlet of the measured CO 2 condenser; the high pressure outlet temperature and pressure measurement point is located between the inlet of the flow meter 3 and the high pressure outlet of the measured CO 2 condenser. The outlet of the compressor 1 is connected with the inlet of a superheater 18, the outlet of the superheater 18 is connected with the high-pressure inlet of a measured CO 2 condenser, the high-pressure outlet of the CO 2 condenser is connected with the inlet of a flowmeter 3, the outlet of the flowmeter 3 is connected with a regulating valve (a bypass valve connected with the regulating valve in parallel), the outlet of the regulating valve is connected with the inlet of an auxiliary evaporator 15, the outlet of the auxiliary evaporator 15 is connected with a gas-liquid separator 16, and the gas-liquid separator 16 is connected with the inlet of the compressor 1 to form a main loop; an auxiliary condenser 2 is connected at the outlet of the compressor 1 in a bypass way, and a regulating valve (a bypass valve connected with the regulating valve in parallel) is connected between the outlet of the auxiliary condenser 2 and the inlet of the auxiliary evaporator 15 to form a bypass loop; in addition, a valve is arranged at the inlet and outlet of the tested CO 2 condenser, and a valve is arranged behind the outlet regulating valve of the flowmeter 3. The high pressure inlet temperature and pressure measurement point of the measured CO 2 condenser is located between the outlet of the superheater 18 and the high pressure inlet of the measured CO 2 condenser; the high pressure outlet temperature and pressure measurement point is located between the inlet of the flow meter 3 and the high pressure outlet of the measured CO 2 condenser. And a pressure temperature measuring point is respectively arranged between the outlet of the flowmeter 3 and the inlet of the following regulating valve and between the outlet of the gas-liquid separator 16 and the inlet of the compressor 1.
In the CO2 evaporator test mode, the low pressure inlet of the measured CO 2 evaporator is connected to the regulator valve at the outlet of the flow meter 3, and the low pressure outlet is connected to the inlet of the calorimeter 17. The temperature and pressure measuring point of the low pressure inlet of the tested CO 2 evaporator is positioned between the outlet of the flowmeter 3 and the low pressure inlet of the tested CO 2 evaporator; the low pressure outlet temperature and pressure measurement is located between the inlet of calorimeter 17 and the low pressure outlet of the measured CO 2 evaporator. The outlet of the compressor 1 is connected with the inlet of the auxiliary condenser 2, the outlet of the auxiliary condenser 2 is connected with the flow meter 3, the outlet of the flow meter 3 is connected with a regulating valve (a bypass valve connected with the regulating valve in parallel), the outlet of the regulating valve is connected with the inlet of the measured CO 2 evaporator, the outlet of the measured CO 2 evaporator is connected with the inlet of the calorimeter 17, the outlet of the calorimeter 17 is connected with a regulating valve, and the outlet of the regulating valve is connected with the inlet of the compressor 1 to form a main loop; the outlet of the auxiliary condenser 2 is connected with a regulating valve (a bypass valve which is connected with the regulating valve in parallel), the outlet of the regulating valve is connected with the inlet of the auxiliary evaporator 15, the outlet of the auxiliary evaporator 15 is connected with the gas-liquid separator 16, and the outlet of the gas-liquid separator 16 is connected with the inlet of the compressor 1 to form a bypass loop; in addition, a valve is arranged at the inlet of the flowmeter 3, and a valve is arranged at the inlet and outlet of the detected CO 2 evaporator. The temperature and pressure measuring point of the low pressure inlet of the tested CO 2 evaporator is positioned between the outlet of the flowmeter 3 and the low pressure inlet of the tested CO 2 evaporator; the low pressure outlet temperature and pressure measurement is located between the inlet of calorimeter 17 and the low pressure outlet of the measured CO 2 evaporator. And a pressure temperature measuring point is arranged between the outlet of the flowmeter 3 and the inlet of the subsequent regulating valve, between the outlet of the gas-liquid separator 16 and the inlet of the compressor 1, and between the outlet of the calorimeter 17 and the inlet of the compressor 1.
The invention can at least realize the following beneficial effects:
1. According to the invention, by controlling the working states of all the components in the test system, the temperature and the pressure of the high-pressure outlet and the low-pressure outlet of the tested CO 2 heat exchanger and the flow of the tested CO 2 heat exchanger can be always kept under the test condition, so that whether the performance of the tested CO 2 heat exchanger meets the requirements or not can be accurately monitored;
2. according to the invention, the test conditions and the test objects can be switched through the setting and switching of the valve and the position change of the measuring point, and the flow direction of the refrigerant in the pipeline can be changed according to the need on the basis of not increasing the hardware cost, so that the function of testing the CO 2 air-conditioning heat exchanger is realized.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a first embodiment of the performance test system for a CO 2 air-conditioning heat exchanger of the present invention;
FIG. 2 is a schematic diagram of the overall structure of a second embodiment of the performance test system for a CO 2 air-conditioning heat exchanger of the present invention;
FIG. 3 is a schematic diagram of the structure of the present invention for the CO 2 condenser test mode;
FIG. 4 is a schematic diagram of the structure of the present invention for the CO 2 evaporator test mode.
Wherein the reference numerals are as follows:
Compressor 1
Auxiliary condenser 2
Flowmeter 3
First to eleventh regulating valves 4 to 14
Auxiliary evaporator 15
Gas-liquid separator 16
Calorimeter 17
Superheater 18
First to fifth temperature and pressure measuring points 19-23
Air volume measuring device 24
Thermostatic chamber 25
Air conditioner cabinet 26
Refrigerating coil 27
Air conditioner cabinet circulating fan 28
Humidifier 29
Warm water tank 30
Circulating water pump 31
First to fourth water flow rate regulating valves 32 to 34
Tested heat exchanger (i.e. tested CO 2 condenser or tested CO 2 evaporator) A
Constant temperature water tank water outlet pipeline a
Constant temperature water tank water return pipeline b
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
As shown in fig. 1, a first embodiment of a performance test system for a CO 2 air-conditioning heat exchanger provided by the present invention includes: the system comprises a compressor 1, an auxiliary condenser 2, a flowmeter 3, first to eleventh regulating valves 4 to 14, an auxiliary evaporator 15, a gas-liquid separator 16, a calorimeter 17, a superheater 18 and first to fifth temperature and pressure measuring points 19 to 23;
The compressor 1 is respectively connected with the first ends of the auxiliary condenser 2, the gas-liquid separator 16, the calorimeter 17 and the superheater 18, the second end of the auxiliary condenser 2 is respectively connected with the first ends of the flowmeter 3, the auxiliary evaporator 15 and the detected heat exchanger A, the second end of the auxiliary evaporator 15 is connected with the second end of the gas-liquid separator 16, the first end of the detected heat exchanger A is respectively connected with the first end of the auxiliary evaporator 15 and the second end of the flowmeter 3, and the second end of the detected heat exchanger A is respectively connected with the second end of the calorimeter 17 and the second end of the superheater 18;
The first regulating valve 4 is arranged on a pipeline between the second end of the auxiliary condenser 2 and the first end of the flowmeter 3, the second regulating valve 5 and the third regulating valve 6 are connected in parallel on a pipeline between the second end of the auxiliary condenser 2 and the first end of the auxiliary evaporator 15, the fourth regulating valve 7 and the fifth regulating valve 8 are connected in parallel and then are connected in series with the sixth regulating valve 9 to be arranged between the second end of the flowmeter 3 and the first end of the heat exchanger A to be tested, the seventh regulating valve 10 and the sixth regulating valve 9 are connected in series and are arranged between the first end of the auxiliary evaporator 15 and the first end of the heat exchanger A to be tested, the first regulating valve 4 and the eighth regulating valve 11 are connected in series and are arranged between the second end of the auxiliary condenser 2 and the first end of the heat exchanger A to be tested, the ninth regulating valve 12 is arranged between the first end of the compressor 1 and the first end of the calorimeter 17, the tenth regulating valve 13 is arranged between the second end of the calorimeter 17 and the second end of the heat exchanger A to be tested, and the eleventh regulating valve 14 is arranged between the second end of the superheater 18 and the second end of the heat exchanger A to be tested;
The first temperature and pressure measuring point 19 is arranged between the sixth regulating valve 9 and the first end of the measured heat exchanger A, the second temperature and pressure measuring point 20 is arranged between the tenth regulating valve 13 and the second end of the measured heat exchanger A, the third temperature and pressure measuring point 21 is arranged between the fourth control valve 7 and the second end of the flowmeter 3, the fourth temperature and pressure measuring point 22 is arranged between the second end of the compressor 1 and the first end of the gas-liquid separator 16, and the fifth temperature and pressure measuring point 23 is arranged between the ninth control valve 12 and the first end of the calorimeter 17.
In the present embodiment, the first control valve 4, the sixth control valve 9, the seventh control valve 10, the eighth control valve 11, the tenth control valve 13, and the eleventh control valve 14 are ball valves, the second control valve 5, the third control valve 6, the fourth control valve 7, the fifth control valve 8, and the ninth control valve 12 are electric expansion valves, the compressor 1 is a variable rotation speed compressor or a variable frequency compressor, the auxiliary condenser 2 and the auxiliary evaporator 15 are double pipe heat exchangers, and the superheater 18 is a plate heat exchanger.
As shown in fig. 2, according to the second embodiment of the performance test system for the CO 2 air-conditioning heat exchanger provided by the present invention, a cooling water circulation unit and a thermostatic chamber 25 are added on the basis of the first embodiment;
the cooling water circulation unit comprises a constant temperature water tank 30, a circulating water pump 31 and first to fourth water flow regulating valves 32 to 34;
The constant temperature water tank 30 is connected with the auxiliary condenser 2, the auxiliary evaporator 15 and the gas-liquid separator 16 respectively through a water outlet pipeline and a water return pipeline, a circulating water pump 31 is arranged on the water outlet pipeline of the constant temperature water tank 30, a first water flow regulating valve 32 is arranged on the water return pipeline of the constant temperature water tank 30 connected with the auxiliary condenser 2, a second water flow regulating valve 33 is arranged on the water return pipeline of the constant temperature water tank 30 connected with the auxiliary evaporator 15, and a third water flow regulating valve 34 is arranged on the water return pipeline of the constant temperature water tank 30 connected with the gas-liquid separator 16.
The thermostatic chamber 25 comprises an air volume measuring device 24, an air conditioning cabinet 26, a refrigerating coil 27, an air conditioning cabinet circulating fan 28 and a humidifier 29;
The air quantity measuring device 24 is connected to an air outlet of a measured heat exchanger A, an air conditioning cabinet 26, a refrigerating coil 27 and a humidifier 29 are arranged in a thermostatic chamber 25, the measured heat exchanger A is arranged at an air conditioning cabinet air outlet of an environment chamber, the refrigerating coil 27 is arranged beside the air conditioning cabinet 26, and an air conditioning cabinet circulating fan 28 is arranged beside the refrigerating coil 27. The air conditioning cabinet 26 and the refrigerating coil 27 control the temperature of the thermostatic chamber 25, and the humidifier 29 controls the humidity of the thermostatic chamber 25. The measured heat exchanger a, the tenth control valve 13, the eleventh control valve 14, the first temperature pressure measuring point 19 and the second temperature pressure measuring point 20 are disposed in the thermostatic chamber 25.
As shown in fig. 3 (the unused piping is omitted), the system performs the CO 2 condenser test mode by closing the first control valve 4, the sixth control valve 9 and the tenth control valve 13, and the test system enters the CO2 condenser test mode.
The outlet of the compressor 1 is connected with the inlet of the superheater 18, the outlet of the superheater 18 is connected with the high-pressure inlet of the measured CO 2 condenser, the high-pressure outlet of the measured CO2 condenser is connected with the inlet of the flowmeter 3, the outlet of the flowmeter 3 is connected with the fourth regulating valve 7, the fourth regulating valve 7 is connected with the fifth regulating valve 8 in parallel to serve as a bypass valve, the outlet of the fourth regulating valve 7 is connected with the inlet of the auxiliary evaporator 15, the outlet of the auxiliary evaporator 15 is connected with the gas-liquid separator 16, and the gas-liquid separator 16 is connected with the inlet of the compressor 1 to form a main loop; the outlet of the compressor 1 is connected with the auxiliary condenser 2 in a bypass way, a second regulating valve 5 is connected between the outlet of the auxiliary condenser 2 and the inlet of the auxiliary evaporator 15, and the second regulating valve 5 is connected with a third regulating valve 6 in parallel to serve as a bypass valve to form a bypass loop; in addition, the tested CO 2 condenser inlet and outlet are respectively provided with an eighth regulating valve 11, an eleventh regulating valve 14 and a seventh regulating valve 10 behind the fourth regulating valve 7. The high pressure inlet temperature and pressure measurement point 20 of the measured CO 2 condenser is located between the outlet of the superheater 18 and the high pressure inlet of the measured CO 2 condenser; the high pressure outlet temperature and pressure measurement 19 is located between the inlet of the flow meter 3 and the high pressure outlet of the measured CO 2 condenser. A pressure temperature measuring point 21 is arranged between the outlet of the flowmeter 3 and the inlet of the fourth regulating valve 7, and a pressure temperature measuring point 22 is arranged between the outlet of the gas-liquid separator 16 and the inlet of the compressor 1.
The test system further comprises a refrigeration cycle unit, a cooling water circulation unit, a heating oil circulation unit and an environment chamber, wherein the refrigeration cycle unit comprises a cooling coil and a heater, the cooling coil, the heater and the tested CO 2 condenser are positioned in the environment chamber, and the cooling coil and the heater control the temperature of the environment chamber to meet the requirement of the tested CO 2 condenser on the test environment. The cooling water circulation unit comprises a constant-temperature water tank, a water pump and a regulating valve and is used for regulating the working states of the auxiliary condenser and the auxiliary evaporator. The heating oil circulation system comprises a constant-temperature oil groove, an oil pump and a regulating valve and is used for regulating the working state of the 7-superheater. Thereby indirectly controlling the temperature and pressure point 20 at the high pressure inlet and the temperature and pressure 19 at the high pressure outlet of the measured CO 2 condenser.
When the performance test is carried out on the tested CO 2 condenser, the low-temperature low-pressure CO 2 refrigerant in the main loop enters from the air inlet of the compressor 1, enters the superheater 8 for heating after being compressed by the compressor 1, enters the tested CO 2 condenser for condensation after being heated, enters the fourth regulating valve 7 after flowing through the flowmeter 3, enters the auxiliary evaporator 15 after being throttled and depressurized in the fourth regulating valve 7, and returns to the air inlet of the compressor 1 after being evaporated; the high-temperature high-pressure CO 2 refrigerant in the bypass loop enters the auxiliary condenser 2 to be condensed, and then enters the auxiliary evaporator 15 after being throttled and depressurized by the second regulating valve 5. In the testing process, the opening degree of the second regulating valve 5 is changed to control the pressure of the high-pressure inlet of the tested CO 2 condenser, the heating oil flow of the superheater 18 is regulated by the heating oil circulation unit to control the temperature of the high-pressure inlet of the tested CO 2 condenser, and the opening degree of the fourth regulating valve 7 is changed to control the outlet temperature of the high-pressure pipe of the tested CO 2 condenser. The measured CO 2 condenser was placed under the conditions required for testing while the flow of refrigerant through the measured CO 2 condenser was controlled by varying the speed or frequency of the compressor 1.
As shown in fig. 4 (the unused piping is omitted), the seventh control valve 10, the eighth control valve 11 and the eleventh control valve 14 are closed to form a CO 2 evaporator test circuit.
The outlet of the compressor 1 is connected with the inlet of the auxiliary condenser 2, the outlet of the auxiliary condenser 2 is connected with the flow meter 3, the outlet of the flow meter 3 is connected with the fourth regulating valve 7, the fourth regulating valve 7 is connected in parallel with the fifth regulating valve 8 as a bypass valve, the outlet of the fourth regulating valve 7 is connected with the inlet of the tested CO 2 evaporator, the outlet of the tested CO 2 evaporator is connected with the inlet of the 5 calorimeter 17, the outlet of the 5 calorimeter 17 is connected with the F7 regulating valve, and the outlet of the F7 regulating valve is connected with the inlet of the 1 compressor 1 to form a main loop; the outlet of the auxiliary condenser 2 is connected with a second regulating valve 5 in a bypass way, the second regulating valve 5 is connected with a third regulating valve 6 in parallel and used as a bypass valve, the outlet of the second regulating valve 5 is connected with the inlet of an auxiliary evaporator 15, the outlet of the auxiliary evaporator 15 is connected with a gas-liquid separator 16, and the outlet of the gas-liquid separator 16 is connected with the inlet of the compressor 1 to form a bypass loop; in addition, a first regulating valve 4 is arranged at the inlet of the flowmeter 3, and a valve sixth regulating valve 9 and a valve tenth regulating valve 13 are respectively arranged at the inlet and outlet of the measured CO 2 evaporator. The low pressure inlet temperature and pressure measuring point 19 of the tested CO 2 evaporator is positioned between the outlet of the flowmeter 3 and the low pressure inlet of the tested CO 2 evaporator; the low pressure outlet temperature and pressure measurement point 20 is located between the inlet of the 5 calorimeter 17 and the low pressure outlet of the measured CO 2 evaporator. A temperature and pressure measuring point 21 is arranged between the outlet of the flowmeter 3 and the inlet of the fourth regulating valve 7, a temperature and pressure measuring point 22 is arranged between the outlet of the gas-liquid separator 16 and the inlet of the compressor 1, and a pressure and temperature measuring point 23 is arranged between the outlet of the calorimeter 17 and the ninth regulating valve 12.
At this time, the refrigeration cycle unit in the test system comprises a cooling coil and a heater, wherein the cooling coil, the heater and the tested CO 2 heat exchanger are positioned in an environment chamber, and the cooling coil and the heater control the temperature of the environment chamber so as to meet the requirement of the tested CO2 heat exchanger on the test environment. The cooling water circulation unit comprises a constant-temperature water tank, a water pump and a regulating valve and is used for regulating the working states of the auxiliary condenser and the auxiliary evaporator. Thereby indirectly controlling the temperature and pressure 20 at the high pressure inlet and the temperature and pressure 19 at the high pressure outlet of the tested CO 2 heat exchanger.
When the performance test is carried out on the tested CO 2 evaporator, the low-temperature low-pressure CO 2 refrigerant in the main loop enters from the air inlet of the compressor 1, enters the auxiliary condenser 2 for condensation after being compressed by the compressor 1, enters the fourth regulating valve 7 after flowing through the flowmeter 3, enters the tested CO 2 evaporator after being throttled and depressurized in the fourth regulating valve 7, enters the calorimeter 17 after being evaporated, and then returns to the air inlet of the compressor 1; the refrigerant condensed in the bypass loop is throttled and depressurized by the second regulating valve 5 and then enters the auxiliary evaporator 15. In the test process, the inlet pressure of the regulating valve F5 is controlled by changing the opening degree of the second regulating valve 5, the low-pressure outlet temperature of the measured CO 2 evaporator 4 is controlled by changing the opening degree of the regulating valve F5, the low-pressure outlet pressure of the measured CO 2 evaporator is controlled by changing the opening degree of the ninth regulating valve 12, and the outlet temperature of the calorimeter 17 is controlled by changing the power of the calorimeter 17. The measured CO 2 evaporator was subjected to the conditions required for the test while the flow of refrigerant through the measured CO 2 evaporator was controlled by varying the speed or frequency of the compressor 1.
According to the invention, by controlling the working states of all the components in the test system, the temperature and the pressure of the high-pressure outlet and the low-pressure outlet of the tested CO 2 heat exchanger and the flow of the tested CO 2 heat exchanger can be always kept under the test condition, so that whether the performance of the tested CO 2 heat exchanger meets the requirements or not can be accurately monitored; the system can switch the test conditions and the test objects through the setting and switching of the valve and the position change of the measuring point, and change the flow direction of the refrigerant in the pipeline according to the need on the basis of not increasing the hardware cost, thereby realizing the function of testing the CO 2 air-conditioning heat exchanger.
The invention provides a method for executing performance test of a CO 2 air conditioner heat exchanger by utilizing the performance test system of the CO 2 air conditioner heat exchanger, which comprises the following steps:
Closing the seventh control valve 10, the eighth control valve 11 and the eleventh control valve 14 to form a CO 2 evaporator test loop;
Starting the compressor 1 to enable the refrigerant to flow in the CO 2 evaporator test loop;
The cooling water quantity of the auxiliary condenser 2 and the auxiliary evaporator 15, the heating oil quantity of the superheater 18, the opening degree of the second regulating valve 5 and the fourth regulating valve 7 and the input power of the calorimeter 17 are regulated and controlled by one or a combination of more than one of the opening degrees, so that the temperature and the pressure of the refrigerant at the inlet and the outlet of the tested sample meet the test condition;
the flow rate of the refrigerant flowing through the sample to be measured is controlled by the rotation speed or frequency of the compressor 1, or the opening degrees of the third control valve 6 and the fifth control valve 8.
Closing the seventh control valve 10, the eighth control valve 11 and the eleventh control valve 14 to form a CO 2 evaporator test loop;
Starting the compressor 1 to enable the refrigerant to flow in the CO 2 evaporator test loop;
The cooling water quantity of the auxiliary condenser 2 and the auxiliary evaporator 15, the heating oil quantity of the superheater 18, the opening degree of the second regulating valve 5 and the fourth regulating valve 7 and the input power of the calorimeter 17 are regulated and controlled by one or a combination of more than one of the opening degrees, so that the temperature and the pressure of the refrigerant at the inlet and the outlet of the tested sample meet the test condition;
the flow rate of the refrigerant flowing through the sample to be measured is controlled by the rotation speed or frequency of the compressor 1, or the opening degrees of the third control valve 6 and the fifth control valve 8.
The invention has been described in detail with reference to specific embodiments thereof, which are merely preferred embodiments of the invention and are not intended to limit the invention thereto. Equivalent substitutions and modifications of the arrangement of components in the test system, the arrangement of the position of the valves, the selection of the position of the measuring points, etc. by those skilled in the art without departing from the principles of the present invention should be considered as falling within the technical scope of the present invention.
Claims (14)
1. A CO 2 air conditioner heat exchanger performance test system, comprising: the system comprises a compressor (1), an auxiliary condenser (2), a flowmeter (3), first to eleventh regulating valves (4 to 14), an auxiliary evaporator (15), a gas-liquid separator (16), a calorimeter (17), a superheater (18) and first to fifth temperature and pressure measuring points (19 to 23);
The compressor (1) is respectively connected with the first ends of the auxiliary condenser (2), the gas-liquid separator (16), the calorimeter (17) and the superheater (18), the second end of the auxiliary condenser (2) is respectively connected with the first ends of the flowmeter (3), the auxiliary evaporator (15) and the detected heat exchanger (A), the second end of the auxiliary evaporator (15) is connected with the second end of the gas-liquid separator (16), the first end of the detected heat exchanger (A) is respectively connected with the first end of the auxiliary evaporator (15) and the second end of the flowmeter (3), and the second end of the detected heat exchanger (A) is respectively connected with the second end of the calorimeter (17) and the second end of the superheater (18);
The first regulating valve (4) is arranged on a pipeline between the second end of the auxiliary condenser (2) and the first end of the flowmeter (3), the second regulating valve (5) and the third regulating valve (6) are connected in parallel on a pipeline between the second end of the auxiliary condenser (2) and the first end of the auxiliary evaporator (15), the fourth regulating valve (7) and the fifth regulating valve (8) are connected in parallel and then are connected in series with the sixth regulating valve (9) between the second end of the flowmeter (3) and the first end of the tested heat exchanger (A), the seventh regulating valve (10) and the sixth regulating valve (9) are connected in series and are connected between the first end of the auxiliary evaporator (15) and the first end of the tested heat exchanger (A), the first regulating valve (4) and the eighth regulating valve (11) are connected in series and are arranged between the second end of the auxiliary condenser (2) and the first end of the tested heat exchanger (A), the ninth regulating valve (12) is arranged between the first end of the compressor (1) and the first end of the calorimeter (17), the tenth regulating valve (13) is arranged between the calorimeter (17) and the first end of the tested heat exchanger (17) and the second end of the tested heat exchanger (14) is arranged between the second end of the heat exchanger (14) and the second end of the tested heat exchanger (14) is arranged between the second end of the evaporator (A);
The first temperature and pressure measuring point (19) is arranged between the sixth regulating valve (9) and the first end of the measured heat exchanger (A), the second temperature and pressure measuring point (20) is arranged between the tenth regulating valve (13) and the second end of the measured heat exchanger (A), the third temperature and pressure measuring point (21) is arranged between the fourth regulating valve (7) and the second end of the flowmeter (3), the fourth temperature and pressure measuring point (22) is arranged between the second end of the compressor (1) and the first end of the gas-liquid separator (16), and the fifth temperature and pressure measuring point (23) is arranged between the ninth regulating valve (12) and the first end of the calorimeter (17).
2. The CO 2 air conditioner heat exchanger performance test system as set forth in claim 1, wherein: the first temperature and pressure measuring point (19) is arranged on a pipeline close to the first end of the measured heat exchanger (A), the second temperature and pressure measuring point (20) is arranged on a pipeline close to the second end of the measured heat exchanger (A), the fourth temperature and pressure measuring point (22) is arranged on a pipeline close to the first end of the gas-liquid separator (16), and the fifth temperature and pressure measuring point (23) is arranged on a pipeline close to the first end of the calorimeter (17).
3. The CO 2 air conditioner heat exchanger performance test system as set forth in claim 1, wherein: the system is divided into a CO 2 condenser test mode and a CO 2 evaporator test mode.
4. The CO 2 air conditioner heat exchanger performance test system as set forth in claim 1, wherein: when the system executes a CO 2 condenser test mode, the first regulating valve (4), the sixth regulating valve (9) and the tenth regulating valve (13) are closed to form a CO 2 condenser test loop.
5. The CO 2 air conditioner heat exchanger performance test system as set forth in claim 1, wherein: when the system executes the CO 2 evaporator test mode, the seventh regulating valve (10), the eighth regulating valve (11) and the eleventh regulating valve (14) are closed to form a CO 2 evaporator test loop.
6. The CO 2 air conditioner heat exchanger performance test system as set forth in claim 1, further comprising: the cooling water circulation unit comprises a constant-temperature water tank (30), a circulating water pump (31) and first to fourth water flow regulating valves (32 to 34);
The constant temperature water tank (30) is connected with the auxiliary condenser (2), the auxiliary evaporator (15) and the gas-liquid separator (16) through a water outlet pipeline and a water return pipeline respectively, a circulating water pump (31) is arranged on the water outlet pipeline of the constant temperature water tank (30), a first water flow regulating valve (32) is arranged on the water return pipeline of the constant temperature water tank (30) connected with the auxiliary condenser (2), a second water flow regulating valve (33) is arranged on the water return pipeline of the constant temperature water tank (30) connected with the auxiliary evaporator (15), and a third water flow regulating valve (34) is arranged on the water return pipeline of the constant temperature water tank (30) connected with the gas-liquid separator (16).
7. The CO 2 air conditioner heat exchanger performance test system as recited in any one of claims 1-6, further comprising: the constant temperature chamber (25), the measured heat exchanger (A), the tenth regulating valve (13), the eleventh regulating valve (14), the first temperature and pressure measuring point (19) and the second temperature and pressure measuring point (20) are arranged in the constant temperature chamber (25).
8. The CO 2 air conditioner heat exchanger performance test system as set forth in claim 7, wherein: the thermostatic chamber (25) comprises an air volume measuring device (24), an air conditioning cabinet body (26), a refrigerating coil (27), an air conditioning cabinet circulating fan (28) and a humidifier (29);
The air quantity measuring device (24) is connected to an air outlet of the measured heat exchanger (A), the air conditioning cabinet body (26), the refrigerating coil (27), the air conditioning cabinet circulating fan (28) and the humidifier (29) are arranged in the thermostatic chamber (25), and the measured heat exchanger (A) is arranged at an air outlet of the air conditioning cabinet of the environmental chamber.
9. The performance test system for a CO 2 air conditioner heat exchanger according to any one of claims 1 to 6, wherein: the first regulating valve (4), the sixth regulating valve (9), the seventh regulating valve (10), the eighth regulating valve (11), the tenth regulating valve (13) and the eleventh regulating valve (14) are ball valves, and the second regulating valve (5), the third regulating valve (6), the fourth regulating valve (7), the fifth regulating valve (8) and the ninth regulating valve (12) are electric expansion valves.
10. The performance test system for a CO 2 air conditioner heat exchanger according to any one of claims 1 to 6, wherein: the compressor (1) is a variable speed compressor or a variable frequency compressor.
11. A performance test system for a CO 2 air conditioner heat exchanger as claimed in any one of claims 1 to 6, wherein the auxiliary condenser (2) and the auxiliary evaporator (15) are double pipe heat exchangers.
12. A performance test system for a CO 2 air conditioner heat exchanger as set forth in any one of claims 1 to 6, wherein the superheater (18) is a plate heat exchanger.
13. A method for performing performance testing of a CO 2 air conditioner heat exchanger using the CO 2 air conditioner heat exchanger performance testing system of claim 1, comprising the steps of:
Closing the seventh regulating valve (10), the eighth regulating valve (11) and the eleventh regulating valve (14) to form a CO 2 evaporator test loop;
Starting a compressor (1) to enable a refrigerant to flow in a CO 2 evaporator test loop;
The cooling water quantity of the auxiliary condenser (2) and the auxiliary evaporator (15), the heating oil quantity of the superheater (18), the opening degree of the second regulating valve (5) and the fourth regulating valve (7) and the input power of the calorimeter (17) are regulated and controlled by one or a combination of more than one of the opening degree and the input power of the calorimeter (17), so that the temperature and the pressure of the refrigerant at the inlet and the outlet of the tested sample meet the test condition;
The flow rate of the refrigerant flowing through the sample to be measured is controlled by the rotation speed or frequency of the compressor (1) or the opening degrees of the third regulating valve (6) and the fifth regulating valve (8).
14. A method for performing a CO 2 air conditioner heat exchanger performance test using the CO 2 air conditioner heat exchanger performance test system of claim 1, comprising the steps of:
Closing the seventh regulating valve (10), the eighth regulating valve (11) and the eleventh regulating valve (14) to form a CO 2 evaporator test loop;
Starting a compressor (1) to enable a refrigerant to flow in a CO 2 evaporator test loop;
The cooling water quantity of the auxiliary condenser (2) and the auxiliary evaporator (15), the heating oil quantity of the superheater (18), the opening degree of the second regulating valve (5) and the fourth regulating valve (7) and the input power of the calorimeter (17) are regulated and controlled by one or a combination of more than one of the opening degree and the input power of the calorimeter (17), so that the temperature and the pressure of the refrigerant at the inlet and the outlet of the tested sample meet the test condition;
The flow rate of the refrigerant flowing through the sample to be measured is controlled by the rotation speed or frequency of the compressor (1) or the opening degrees of the third regulating valve (6) and the fifth regulating valve (8).
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