A refrigerant heat exchanger performance test system

Abstract

The invention relates to the technical field of heat exchanger performance testing, and discloses a refrigerant heat exchanger performance testing system, comprising an auxiliary compressor, an auxiliary condenser, a flow meter and a main circuit regulating valve connected in sequence, and also comprising a subcooler, a back pressure regulating valve, a first connecting pipe, a first valve, a second valve, a T1 measuring point, a T2 measuring point and a T3 measuring point, wherein the subcooler is arranged between the flow meter and the main circuit regulating valve; the back pressure regulating valve is connected to the air inlet of the auxiliary compressor; one end of the first connecting pipe is connected to a side of the subcooler close to the main circuit regulating valve, and the other end is connected to the T1 measuring point; the first valve is arranged on the first connecting pipe; the second valve is arranged on a connecting pipe connecting the subcooler and the main circuit regulating valve; the T2 measuring point is arranged on a side of the back pressure regulating valve away from the auxiliary compressor, the heat exchanger to be tested is connected to the T1 measuring point and the T2 measuring point, and the T3 measuring point is arranged at an end of the subcooler away from the flow meter.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchanger performance testing, and in particular to a refrigerant heat exchanger performance testing system. Background Art

[0002] Energy conservation and environmental protection have become the mainstream trend in China. As a replacement for traditional fuel vehicles, new energy vehicles have put forward higher requirements for energy conservation and low-temperature heating of vehicle air-conditioning systems. As a carrier for low-temperature heating operation, R744 (CO2) refrigerant has a large energy efficiency ratio and has gradually become a research direction for refrigeration systems of new energy vehicles. Compared with traditional refrigerants, R744 has obvious advantages in environmental protection, non-toxicity, economy and high refrigeration capacity per unit volume. As long as the pressure resistance of the air-conditioning system is reasonably designed, the safety and reliability of the CO2 system under supercritical pressure can be guaranteed, and it has high low-temperature heating performance. As one of the environmentally friendly refrigerants, R744 has a good application prospect. With the development of refrigeration and air-conditioning technology and the demand for new energy vehicles, R744 refrigeration systems will surely be widely used.

[0003] Since the R744 refrigeration system is affected by many factors such as temperature fluctuations, start-stop cycles, and heat pump defrosting during actual operation, its internal pressure is frequently alternating. In order to meet the testing requirements for the heat exchanger of the R744 refrigeration cycle system, there is an urgent need for a device that can perform multiple heat exchanger performance tests.

[0004] Based on this, there is an urgent need for a refrigerant heat exchanger performance testing system to solve the above-mentioned problems. Summary of the invention

[0005] Based on the above, the purpose of the present invention is to provide a refrigerant heat exchanger performance testing system, which can test two types of heat exchangers by switching a first valve and a second valve, thereby improving the practicality of the testing system and reducing the cost of the heat exchanger test detection system.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A refrigerant heat exchanger performance test system includes an auxiliary compressor, an auxiliary condenser, a flow meter and a main circuit regulating valve connected in sequence, and also includes:

[0008] A subcooler, which is arranged between the flow meter and the main circuit regulating valve;

[0009] a back pressure regulating valve connected to the air inlet of the auxiliary compressor;

[0010] A first connecting pipe, one end of which is connected to one end of the subcooler close to the main circuit regulating valve;

[0011] A first valve, which is disposed on the first connecting pipe;

[0012] A second valve, which is arranged on a connecting pipe connecting the subcooler and the main circuit regulating valve;

[0013] T1 measuring point, which is arranged at a side of the main circuit regulating valve away from the subcooler, and at an end of the first connecting pipe away from the subcooler;

[0014] A T2 measuring point, which is arranged on a side of the back pressure regulating valve away from the auxiliary compressor, and the heat exchanger to be tested is connected to the T1 measuring point and the T2 measuring point;

[0015] The T3 measuring point is arranged at one end of the subcooler away from the flow meter and is used to measure the inlet temperature and pressure of the main circuit regulating valve.

[0016] As an optimal technical solution for a refrigerant heat exchanger performance test system, it also includes a diversion component, which includes an auxiliary circuit regulating valve, an auxiliary evaporator and an intake pressure regulating valve connected in sequence, the auxiliary circuit regulating valve is connected to the end of the auxiliary condenser away from the auxiliary compressor, and the intake pressure regulating valve is connected to the air inlet of the auxiliary compressor.

[0017] As a preferred technical solution for a refrigerant heat exchanger performance test system, it also includes:

[0018] The T4 measurement point is arranged at the end of the suction pressure regulating valve away from the auxiliary evaporator, and is used to measure the temperature and pressure at the outlet side of the auxiliary evaporator.

[0019] As a preferred technical solution for a refrigerant heat exchanger performance test system, it also includes:

[0020] a third valve, which is arranged on a connecting pipe connecting the auxiliary condenser and the flow meter;

[0021] A second connecting pipe, one end of which is connected to the end of the auxiliary circuit regulating valve close to the auxiliary evaporator, and the other end of which is connected to the end of the main circuit regulating valve away from the subcooler;

[0022] a fourth valve, which is disposed on the second connecting pipe;

[0023] A fifth valve, which is arranged on a connecting pipe connecting the main circuit regulating valve and the T1 measuring point;

[0024] A third connecting pipe, one end of which is connected to the end of the flow meter away from the subcooler, and the other end is connected to the end of the T1 measuring point close to the main circuit regulating valve;

[0025] a sixth valve, which is disposed on the third connecting pipe;

[0026] a seventh valve, which is arranged on a connecting pipe connecting the back pressure regulating valve and the auxiliary compressor;

[0027] a fourth connecting pipe, one end of which is connected to the exhaust port of the auxiliary compressor, and the other end of which is connected to one end of the T2 measuring point close to the back pressure regulating valve;

[0028] an eighth valve, which is disposed on the fourth connecting pipe;

[0029] A superheater is disposed on the fourth connecting pipe and located between the eighth valve and the auxiliary compressor.

[0030] As a preferred technical solution for a refrigerant heat exchanger performance test system, it also includes:

[0031] a fifth connecting pipe, one end of which is connected to one end of the main circuit regulating valve close to the subcooler;

[0032] T5 measuring point, which is arranged at one end of the fifth connecting pipe away from the main circuit regulating valve;

[0033] a ninth valve, which is disposed on the fifth connecting pipe;

[0034] a sixth connecting pipe, one end of which is connected to an end of the main circuit regulating valve away from the subcooler;

[0035] a tenth valve, which is disposed on the sixth connecting pipe;

[0036] a calorimeter, which is disposed on the sixth connecting pipe;

[0037] T6 measuring point, which is arranged at one end of the sixth connecting pipe away from the main circuit regulating valve;

[0038] The heat exchanger to be tested is an intermediate heat exchanger, which is provided with a high-pressure inlet, a high-pressure outlet, a low-pressure inlet and a low-pressure outlet, the high-pressure inlet is connected to the T1 measuring point, the low-pressure outlet is connected to the T2 measuring point, the high-pressure outlet is connected to the T5 measuring point, and the low-pressure inlet is connected to the T6 measuring point.

[0039] As an optimal technical solution for a refrigerant heat exchanger performance testing system, the heat exchanger to be tested is a water-refrigerant heat exchanger, and the refrigerant heat exchanger performance testing system also includes a circulating water unit, and the water-refrigerant heat exchanger is connected to the circulating water unit, and the circulating water unit can provide circulating water with a preset temperature and a preset flow rate for the water-refrigerant heat exchanger.

[0040] As a preferred technical solution for a refrigerant heat exchanger performance test system, the heat exchanger to be tested is an air-refrigerant heat exchanger, and the air-refrigerant heat exchanger is provided with an air circulation system.

[0041] As an optimal technical solution for a refrigerant heat exchanger performance test system, it also includes an environmental chamber, and the air-refrigerant heat exchanger is located in the environmental chamber.

[0042] As an optimal technical solution for a refrigerant heat exchanger performance test system, a cooling coil and a heating tube are provided in the environmental chamber, the cooling coil is used to cool the environmental chamber, and the heating tube is used to heat the environmental chamber.

[0043] As an optimal technical solution for a refrigerant heat exchanger performance test system, it also includes a cooling water circulation unit, which includes a constant temperature water tank, a water pump and a regulating valve. The constant temperature water tank is externally connected to a circulating water circuit, and the auxiliary condenser is connected to the circulating water circuit. A water pump and a regulating valve are provided on the circulating water circuit to adjust the flow rate of water in the circulating water circuit.

[0044] The beneficial effects of the present invention are:

[0045] The refrigerant heat exchanger performance test system of the present invention can perform performance tests on the evaporator core and the evaporator assembly. When the evaporator core is tested, the heat exchanger to be tested is selected as the evaporator core, the second valve is opened, and the first valve is closed; the low-pressure and low-temperature gaseous refrigerant is converted into a high-pressure gaseous refrigerant through an auxiliary compressor, and then converted into a liquid refrigerant (subcritical refrigeration cycle) or a high-pressure gaseous refrigerant after cooling (supercritical refrigeration cycle) through an auxiliary condenser, and the high-pressure refrigerant at the outlet of the auxiliary condenser is measured by a flow meter for the flow of the refrigerant, and then the temperature of the refrigerant is adjusted through a supercooler to reach a temperature that meets the test requirements, and the T3 measuring point measures the inlet temperature and pressure of the main circuit regulating valve, and then the refrigerant flows through the evaporator core and tests it after throttling the main circuit regulating valve, and the inlet and outlet temperatures and pressures of the evaporator core are tested through the T1 measuring point and the T2 measuring point, and finally refluxes to the auxiliary compressor under the regulation of the back pressure regulating valve. The performance of the evaporator core can be obtained through the measured data of the T2 measuring point, the T3 measuring point and the flow meter, and the performance test of the evaporator core is realized.

[0046] When the evaporator assembly is tested, the heat exchanger to be tested is selected as the evaporator assembly. Since the evaporator assembly has its own expansion valve, the second valve is closed and the first valve is opened. The low-pressure and low-temperature gaseous refrigerant is converted into a high-pressure gaseous refrigerant through the auxiliary compressor, and then converted into a liquid refrigerant (subcritical refrigeration cycle) or a high-pressure gaseous refrigerant after cooling (supercritical refrigeration cycle) through the auxiliary condenser. The high-pressure refrigerant at the outlet of the auxiliary condenser is measured by a flow meter to measure the flow of the refrigerant, and then the temperature of the refrigerant is adjusted by a supercooler to reach a temperature that meets the test requirements, flows through the evaporator assembly and is tested, and the inlet and outlet temperatures and pressures of the evaporator assembly are tested by the T1 measuring point and the T2 measuring point at the same time, and finally flows back to the auxiliary compressor under the regulation of the back pressure regulating valve. The performance of the evaporator assembly can be obtained through the measured data of the T1 measuring point, the T2 measuring point and the flow meter, and the performance test of the evaporator assembly is realized. The present invention can test two types of heat exchangers by switching the second valve and the first valve, improves the practicality of the test system, and reduces the cost of the heat exchanger test detection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0048] Figure 1 is a schematic diagram of an evaporator core testing system provided in Embodiment 1 of the present invention;

[0049] Figure 2 is a schematic diagram of a refrigerant heat exchanger performance testing system provided in Embodiment 1 of the present invention;

[0050] Figure 3 is a schematic diagram of an evaporator assembly testing system provided in Embodiment 1 of the present invention;

[0051] Figure 4 is a schematic diagram of a refrigerant heat exchanger performance test system provided in Embodiment 2 of the present invention;

[0052] Figure 5 is a schematic diagram of a condenser testing system provided in Embodiment 2 of the present invention;

[0053] Figure 6 is a schematic diagram of a refrigerant heat exchanger performance test system provided in Embodiment 3 of the present invention;

[0054] Figure 7 It is a schematic diagram of the intermediate heat exchanger testing system provided in the third embodiment of the present invention.

[0055] The following are marked in the figure:

[0056] 11. Auxiliary compressor; 12. Auxiliary condenser; 13. Flow meter; 14. Subcooler; 15. Heat exchanger to be tested; 16. Auxiliary evaporator; 17. Superheater; 18. Calorimeter;

[0057] 21. Main circuit regulating valve; 22. Back pressure regulating valve; 23. Auxiliary circuit regulating valve; 24. Suction pressure regulating valve;

[0058] 31. First valve; 32. Second valve; 33. Third valve; 34. Fourth valve; 35. Fifth valve; 36. Sixth valve; 37. Seventh valve; 38. Eighth valve; 39. Ninth valve; 40. Tenth valve;

[0059] 41, T1 measuring point; 42, T2 measuring point; 43, T3 measuring point; 44, T4 measuring point; 45, T5 measuring point; 46, T6 measuring point. DETAILED DESCRIPTION

[0060] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0061] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0063] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0064] Embodiment 1

[0065] Since the R744 refrigeration system is affected by many factors such as temperature fluctuations, start-stop cycles, and heat pump defrosting during actual operation, its internal pressure is frequently alternating. In order to meet the testing requirements for the heat exchanger of the R744 refrigeration cycle system, there is an urgent need for a device that can perform performance tests on multiple refrigerant heat exchangers.

[0066] To solve the above problems, Figure 1 As shown, the present invention provides a refrigerant heat exchanger performance test system, including an auxiliary compressor 11, an auxiliary condenser 12, a flow meter 13, a subcooler 14, a main circuit regulating valve 21, a T1 measuring point 41, a T2 measuring point 42, a back pressure regulating valve 22 and a diversion component.

[0067] In this embodiment, the refrigerant heat exchanger performance test system can perform a performance test on the evaporator core. Specifically, the exhaust port of the auxiliary compressor 11 is connected to the auxiliary condenser 12, the flow meter 13, the subcooler 14, the T3 measuring point 43, the main circuit regulating valve 21 and the T1 measuring point 41 in sequence through a connecting pipe, and the air inlet of the auxiliary compressor 11 is connected to the back pressure regulating valve 22 and the T2 measuring point 42 in sequence through a connecting pipe. The heat exchanger 15 to be tested is connected between the T1 measuring point 41 and the T2 measuring point 42. The T1 measuring point 41 and the T2 measuring point 42 can test the pressure and temperature of the inlet and outlet of the heat exchanger 15 to be tested.

[0068] Specifically, due to the particularity of the refrigerant, its refrigeration cycle is divided into two modes: supercritical and subcritical. Since the capacity variation range of the auxiliary compressor 11 is limited, in order to ensure that the refrigerant heat exchanger performance test system can perform tests in a larger capacity range, the system is also provided with a shunt component. The shunt component includes an auxiliary circuit regulating valve 23, an auxiliary evaporator 16 and a suction pressure regulating valve 24 connected in sequence, wherein the auxiliary circuit regulating valve 23 is connected to the end of the auxiliary condenser 12 away from the auxiliary compressor 11, and the suction pressure regulating valve 24 is connected to the air inlet of the auxiliary compressor 11. The shunt component is used to shunt the liquid refrigerant discharged from the auxiliary condenser 12, so that the refrigerant demand circulating in the test system meets a variety of working conditions, thereby increasing the practicality of the test system and the accuracy of the test data. Specifically, after the auxiliary condenser 12 discharges the liquid refrigerant, the liquid refrigerant flows to the flow meter 13 and the auxiliary circuit regulating valve 23 respectively. The auxiliary circuit regulating valve 23 is adjusted to ensure the refrigerant flow distribution of the flow meter 13 and the auxiliary circuit regulating valve 23, so that the auxiliary condenser 12 discharges liquid refrigerant (subcritical refrigeration cycle state) or high-pressure gaseous refrigerant after cooling (supercritical refrigeration cycle state) to ensure that the test conditions required by the heat exchanger 15 to be tested are met. The refrigerant in the diversion component ensures that the auxiliary compressor 11 is in a suitable working state through the auxiliary evaporator 16 and the suction pressure regulating valve 24. The adjustment of the refrigerant flow rate in the test system is realized.

[0069] When the evaporator core needs to be tested, the heat exchanger 15 to be tested is selected as the evaporator core, and the inlet of the evaporator core is connected to the T1 measuring point 41, and the outlet of the evaporator core is connected to the T2 measuring point 42. During the test, the low-pressure and low-temperature gaseous refrigerant is converted into high-pressure gaseous refrigerant through the auxiliary compressor 11, and then converted into liquid refrigerant (subcritical refrigeration cycle) or high-pressure gaseous refrigerant (supercritical refrigeration cycle) after cooling through the auxiliary condenser 12 under the regulation of the diversion component, and then part of the high-pressure refrigerant is measured by the flow meter 13 for the flow of the refrigerant, and then the temperature of the refrigerant is adjusted through the subcooler 14 to reach the temperature that meets the test requirements, and the inlet temperature and pressure of the main circuit regulating valve 21 are measured at the T3 measuring point 43, and then the refrigerant flows through the evaporator core after throttling the main circuit regulating valve 21 and tests it, and the inlet and outlet temperatures and pressures of the evaporator core are tested through the T1 measuring point 41 and the T2 measuring point 42, and finally flows back to the auxiliary compressor 11 under the regulation of the back pressure regulating valve 22. The diversion component diverts the refrigerant discharged from the auxiliary condenser 12 so that the refrigerant demand of the test system can meet various working conditions. For example, the refrigeration system under supercritical and subcritical modes of the refrigerant in the evaporator core can be tested, thereby increasing the practicality of the test system. The performance of the evaporator core can be obtained through the measured data of the T2 measurement point 42, the T3 measurement point 43 and the flow meter 13, thereby realizing the performance test of the evaporator core.

[0070] This embodiment can test not only the evaporator core, but also the evaporator assembly. Figure 2 As shown, the refrigerant heat exchanger performance test system also includes a first connecting pipe, a first valve 31 and a second valve 32. Among them, one end of the first connecting pipe is connected to the side of the subcooler 14 close to the main circuit regulating valve 21, and the other end is connected to the side of the T1 measuring point 41 close to the main circuit regulating valve 21. The first connecting pipe is provided with the first valve 31; the second valve 32 is provided on the connecting pipe between the subcooler 14 and the main circuit regulating valve 21.

[0071] The specific test method is:

[0072] When testing the evaporator core, the heat exchanger 15 to be tested is selected as the evaporator core, the second valve 32 is opened, the first valve 31 is closed, the inlet of the evaporator core is connected to the T1 measuring point 41, and the outlet of the evaporator core is connected to the T2 measuring point 42.

[0073] When testing the evaporator assembly, the heat exchanger 15 to be tested is selected as the evaporator assembly. Since the evaporator assembly has its own expansion valve, the second valve 32 is closed and the first valve 31 is opened. The inlet of the evaporator assembly is connected to the T1 measuring point 41, and the outlet of the evaporator assembly is connected to the T2 measuring point 42.

[0074] like Figure 3 As shown, the low-pressure and low-temperature gaseous refrigerant is converted into high-pressure gaseous refrigerant by the auxiliary compressor 11, and then converted into liquid refrigerant (subcritical refrigeration cycle) or high-pressure gaseous refrigerant (supercritical refrigeration cycle) after cooling by the auxiliary condenser 12 under the regulation of the diversion component, and then part of the high-pressure refrigerant is measured by the flow meter 13 for the flow of the refrigerant, and then the temperature of the refrigerant is adjusted by the subcooler 14 to reach the temperature that meets the test requirements, and then flows through the evaporator assembly and is tested, and the inlet and outlet temperature and pressure of the evaporator assembly are tested at the same time through the T1 measuring point 41 and the T2 measuring point 42, and finally flows back to the auxiliary compressor 11 under the regulation of the back pressure regulating valve 22. The diversion component diverts the refrigerant discharged from the auxiliary condenser 12, so that the refrigerant demand of the test system meets a variety of working conditions, for example, testing the refrigeration system in the supercritical and subcritical modes of the refrigerant in the evaporator assembly, thereby increasing the practicality of the test system. The performance of the evaporator assembly can be obtained through the measured data of the T1 measuring point 41, the T2 measuring point 42 and the flow meter 13, thereby realizing the performance test of the evaporator assembly.

[0075] Preferably, the refrigerant heat exchanger performance test system further includes a T4 measurement point 44. The T4 measurement point 44 is disposed at the end of the suction pressure regulating valve 24 away from the auxiliary evaporator 16, and the T4 measurement point 44 is used to measure the temperature and pressure at the outlet side of the auxiliary evaporator 16. The data from the T4 measurement point 44 can measure the temperature and pressure at the outlet side of the auxiliary evaporator 16 to ensure that the auxiliary compressor 11 is in a suitable working state.

[0076] The circulation state of the cold medium in the test system is adjusted so that the cold medium reaches a state that meets the test requirements, the test accuracy of the test system is increased, and the debugging work of the test system is facilitated, saving debugging time.

[0077] Preferably, since the internal coldness needs to be transferred out during the test of the heat exchanger 15 to be tested, the refrigerant heat exchanger performance test system also includes an environmental chamber, in which a heating pipe is arranged. During the test of the heat exchanger 15 to be tested, the heat exchanger 15 to be tested is located in the environmental chamber, the heat exchanger 15 to be tested cools the environmental chamber, and the heating pipe heats the environmental chamber, so that the temperature of the environmental chamber simulates the actual ambient temperature of the heat exchanger 15 to be tested, thereby increasing the accuracy of the test data.

[0078] Preferably, the heat exchanger 15 to be tested can be an air-refrigerant heat exchanger or a water-refrigerant heat exchanger. When testing an air-refrigerant heat exchanger, the system also includes an environmental chamber, in which the air-refrigerant heat exchanger is arranged, and the air-refrigerant heat exchanger is provided with an air circulation system, and the air-refrigerant heat exchanger can directly transfer cold or heat to the environmental chamber through the air circulation system. In order to simulate the use environment of the air-refrigerant heat exchanger, a cooling coil and a heating tube are also provided in the environmental chamber. When testing a heating type heat exchanger, the cooling coil is used to cool the environmental chamber; when testing a cooling type heat exchanger, the heating tube is used to heat the environmental chamber to increase the accuracy of its test results. When testing a water-refrigerant heat exchanger, the system also includes a circulating water unit, the water-refrigerant heat exchanger is connected to the circulating water unit, the circulating water unit can provide the water-refrigerant heat exchanger with circulating water of a preset temperature and a preset flow rate, and the water-refrigerant heat exchanger can directly transfer cold or heat through the circulating water for heat exchange, so as to simulate the actual use scenario of the water-refrigerant heat exchanger and increase the accuracy of its test results. It should be noted that the air-refrigerant heat exchanger is provided with an air circulation system, and the water-refrigerant heat exchanger is provided with a circulating water unit, which are conventional settings in the art and will not be repeated here.

[0079] Preferably, the refrigerant heat exchanger performance test system further includes a cooling water circulation unit, which includes a constant temperature water tank, a water pump and a regulating valve. The constant temperature water tank is externally connected to a set of circulating water circuits, and the auxiliary condenser 12 is connected to the circulating water circuit. The circulating water circuit is provided with a water pump and a regulating valve for regulating the flow of water in the circulating water circuit. The cooling water circulation unit is used to make the auxiliary condenser 12 work normally and improve its heat exchange efficiency.

[0080] More specifically, the suction pressure regulating valve 24, the main circuit regulating valve 21, the auxiliary circuit regulating valve 23 and the back pressure regulating valve 22 in this embodiment are electric expansion valves, and may also be other types of regulating valves such as pneumatic regulating valves. The auxiliary condenser 12 and the auxiliary evaporator 16 are shell-and-tube heat exchangers, and may also be other types of heat exchangers such as plate heat exchangers.

[0081] It should be particularly noted that, in this embodiment, the refrigerant circulating in the test system may be R744 or other types of refrigerants.

[0082] Embodiment 2

[0083] This embodiment also provides a heat exchanger performance test system, which can test the evaporator core and the evaporator assembly, and can also test the condenser. Figure 4 As shown, the difference between this embodiment and the first embodiment is that, on the basis of the first embodiment, a second connecting pipe, a third connecting pipe, a fourth connecting pipe, a third valve 33, a fourth valve 34, a fifth valve 35, a sixth valve 36, a seventh valve 37, an eighth valve 38 and a superheater 17 are additionally provided. Among them, the third valve 33 is arranged on the connecting pipe between the auxiliary condenser 12 and the flowmeter 13; one end of the second connecting pipe is connected to the end of the auxiliary circuit regulating valve 23 close to the auxiliary evaporator 16, and the other end is connected to the end of the main circuit regulating valve 21 away from the subcooler 14, and the fourth valve 34 is arranged on the second connecting pipe; the fifth valve 35 is arranged on the connecting pipe between the main circuit regulating valve 21 and the T1 measuring point 41; one end of the third connecting pipe is connected to the end of the flowmeter 13 away from the subcooler 14, and the other end is connected to the end of the T1 measuring point 41 close to the main circuit regulating valve 21, and the sixth valve 36 is arranged on the third connecting pipe; the seventh valve 37 is arranged on the connecting pipe between the back pressure regulating valve 22 and the auxiliary compressor 11; one end of the fourth connecting pipe is connected to the exhaust port of the auxiliary compressor 11, and the other end is connected to the end of the T2 measuring point 42 close to the back pressure regulating valve 22, on the fourth connecting pipe, and the eighth valve 38 and the superheater 17 are arranged on the fourth connecting pipe.

[0084] The specific test method is:

[0085] When testing the evaporator core, the heat exchanger 15 to be tested is selected as the evaporator core, the fourth valve 34, the sixth valve 36, the eighth valve 38 and the first valve 31 are closed, the third valve 33, the second valve 32, the fifth valve 35 and the seventh valve 37 are opened, the inlet of the evaporator core is connected to the T1 measuring point 41, and the outlet of the evaporator core is connected to the T2 measuring point 42.

[0086] When the evaporator assembly is tested, the heat exchanger 15 to be tested is selected as the evaporator assembly, the fourth valve 34, the sixth valve 36, the eighth valve 38, the second valve 32 and the fifth valve 35 are closed, the third valve 33, the first valve 31 and the seventh valve 37 are opened, the inlet of the evaporator assembly is connected to the T1 measuring point 41, and the outlet of the evaporator assembly is connected to the T2 measuring point 42.

[0087] When testing the condenser, the heat exchanger 15 to be tested is selected as the condenser, the seventh valve 37, the fifth valve 35, the third valve 33, and the first valve 31 are closed, the eighth valve 38, the sixth valve 36, the second valve 32, and the fourth valve 34 are opened, the inlet of the condenser is connected to the T2 measuring point 42, and the outlet of the condenser is connected to the T1 measuring point 41.

[0088] like Figure 5 As shown, the low-pressure and low-temperature gaseous refrigerant is converted into high-pressure gaseous refrigerant through the auxiliary compressor 11, and a part of the high-pressure gaseous refrigerant is converted into liquid refrigerant through the auxiliary condenser 12, and then flows back to the auxiliary compressor 11 through the diversion component, so that the refrigerant demand of the test system meets various working conditions, for example, the refrigeration system in the supercritical and subcritical modes of the refrigerant in the test condenser; another part of the high-pressure gaseous refrigerant is converted into liquid refrigerant through the heater 17, and then the temperature of the high-pressure gaseous refrigerant is increased through the heater 17 to reach a temperature that meets the test requirements. After being discharged from the superheater 17, the high-temperature and high-pressure gaseous refrigerant directly flows through the condenser for heat exchange and becomes a liquid refrigerant. At the same time, the inlet and outlet temperatures and pressures of the condenser are tested and analyzed through the T1 measuring point 41 and the T2 measuring point 42. Then, the flow rate of the liquid refrigerant is measured by the flowmeter 13. Then, the liquid refrigerant is cooled again through the cooler 14. Then, the pressure and flow rate are adjusted by the main circuit regulating valve 21. Then, it is converted into a gaseous refrigerant through the auxiliary evaporator 16, and finally, it flows back to the auxiliary compressor 11 under the regulation of the auxiliary circuit regulating valve 23. The shunt component and the auxiliary condenser 12 shunt the high-pressure gaseous refrigerant discharged from the auxiliary compressor 11, so that the refrigerant demand of the test system meets various working conditions, thereby increasing the practicality of the test system. The performance of the tested condenser can be obtained through the measured data of the T1 measuring point 41, the T2 measuring point 42 and the flowmeter 13, thereby realizing the performance test of the condenser.

[0089] Embodiment 3

[0090] This embodiment also provides a heat exchanger performance test system, which can test the evaporator core, evaporator assembly and condenser, and can also test the intermediate heat exchanger. Figure 6 As shown, the difference between this embodiment and the second embodiment is that, on the basis of the second embodiment, a T5 measuring point 45, a T6 measuring point 46, a fifth connecting pipe, a sixth connecting pipe, a ninth valve 39, a tenth valve 40 and a calorimeter 18 are additionally provided. Among them, one end of the fifth connecting pipe is connected to the end of the main circuit regulating valve 21 close to the subcooler 14, and the other end is connected to the T5 measuring point 45, and the fifth connecting pipe is provided with the ninth valve 39; one end of the sixth connecting pipe is connected to the end of the main circuit regulating valve 21 away from the subcooler 14, and the other end is connected to the T6 measuring point 46, and the sixth connecting pipe is provided with the tenth valve 40; the calorimeter 18 is provided on the sixth connecting pipe and is located between the tenth valve 40 and the T6 measuring point 46.

[0091] The specific test method is:

[0092] When testing the evaporator core, the heat exchanger 15 to be tested is selected as the evaporator core, the fourth valve 34, the sixth valve 36, the eighth valve 38, the first valve 31, the ninth valve 39 and the tenth valve 40 are closed, the third valve 33, the second valve 32, the fifth valve 35 and the seventh valve 37 are opened, the inlet of the evaporator core is connected to the T1 measuring point 41, and the outlet of the evaporator core is connected to the T2 measuring point 42.

[0093] When the evaporator assembly is tested, the heat exchanger 15 to be tested is selected as the evaporator assembly, the fourth valve 34, the sixth valve 36, the eighth valve 38, the second valve 32, the fifth valve 35, the ninth valve 39 and the tenth valve 40 are closed, the third valve 33, the first valve 31 and the seventh valve 37 are opened, the inlet of the evaporator assembly is connected to the T1 measuring point 41, and the outlet of the evaporator assembly is connected to the T2 measuring point 42.

[0094] When testing the condenser, the heat exchanger 15 to be tested is selected as the condenser, the seventh valve 37, the fifth valve 35, the third valve 33, the first valve 31, the ninth valve 39 and the tenth valve 40 are closed, the eighth valve 38, the sixth valve 36, the second valve 32 and the fourth valve 34 are opened, the inlet of the condenser is connected to the T2 measuring point 42, and the outlet of the condenser is connected to the T1 measuring point 41.

[0095] When testing the intermediate heat exchanger, the heat exchanger to be tested 15 is selected as the intermediate heat exchanger, the fifth valve 35, the eighth valve 38, the sixth valve 36, the second valve 32 and the fourth valve 34 are closed, and the third valve 33, the first valve 31, the ninth valve 39, the tenth valve 40 and the seventh valve 37 are opened. The intermediate heat exchanger is provided with a high-pressure inlet, a high-pressure outlet, a low-pressure inlet and a low-pressure outlet. The high-pressure inlet is connected to the T1 measuring point 41, the low-pressure outlet is connected to the T2 measuring point 42, the high-pressure outlet is connected to the T5 measuring point 45, and the low-pressure inlet is connected to the T6 measuring point 46.

[0096] like Figure 7 As shown, the low-pressure and low-temperature gaseous refrigerant is converted into high-pressure gaseous refrigerant through the auxiliary compressor 11, and then converted into liquid refrigerant (subcritical refrigeration cycle) or high-pressure gaseous refrigerant (supercritical refrigeration cycle) after cooling through the auxiliary condenser 12 under the regulation of the diversion component, and then part of the high-pressure refrigerant is measured by the flow meter 13 for the flow of the refrigerant, and then the temperature of the liquid refrigerant is reduced through the cooler 14 to reach the temperature that meets the test requirements, and then flows through the T1 measurement point 41, the high-pressure inlet and high-pressure outlet of the intermediate heat exchanger and the T5 measurement point 45. Then, after the throttling of the main circuit regulating valve 21, it flows through the calorimeter 18 and then passes through the T6 measurement point 46, the low-pressure inlet and low-pressure outlet of the intermediate heat exchanger and the T2 measurement point 42 to become a gaseous refrigerant. At the same time, the temperature and pressure of the high-pressure inlet, high-pressure outlet, low-pressure inlet and low-pressure outlet of the intermediate heat exchanger are tested through the T1 measurement point 41, the T5 measurement point 45, the T2 measurement point 42 and the T6 measurement point 46, and finally flows back to the auxiliary compressor 11 under the regulation of the back pressure regulating valve 22. The diversion component diverts the refrigerant discharged from the auxiliary condenser 12 so that the refrigerant demand of the test system meets various working conditions. For example, the refrigeration system under supercritical and subcritical modes of the refrigerant in the intermediate heat exchanger is tested, thereby increasing the practicality of the test system.

[0097] The performance of the high-pressure side of the intermediate heat exchanger under test can be obtained through the data of T1 measuring point 41, T5 measuring point 45 and flow meter 13; the performance of the low-pressure side of the intermediate heat exchanger under test can be obtained through the data of T2 measuring point 42, T6 measuring point 46 and flow meter 13; the refrigerant flow measured and converted by the flow meter 13 and calorimeter 18 can verify the flow deviation, improve the accuracy of the test data, and realize the performance test of the intermediate heat exchanger.

[0098] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A refrigerant heat exchanger performance test system, comprising an auxiliary compressor (11), an auxiliary condenser (12), a flow meter (13) and a main circuit regulating valve (21) connected in sequence, characterized in that: Also includes: a subcooler (14), which is arranged between the flow meter (13) and the main circuit regulating valve (21); a back pressure regulating valve (22), connected to the air inlet of the auxiliary compressor (11); A first connecting pipe, one end of which is connected to one end of the subcooler (14) close to the main circuit regulating valve (21); a first valve (31), which is arranged on the first connecting pipe; a second valve (32) disposed on a connecting pipe connecting the subcooler (14) and the main circuit regulating valve (21); A T1 measuring point (41), which is arranged on a side of the main circuit regulating valve (21) away from the subcooler (14), and is arranged on an end of the first connecting pipe away from the subcooler (14); A T2 measuring point (42) is arranged on a side of the back pressure regulating valve (22) away from the auxiliary compressor (11), and the heat exchanger (15) to be tested is connected to the T1 measuring point (41) and the T2 measuring point (42); A T3 measuring point (43), which is arranged at an end of the subcooler (14) away from the flow meter (13) and is used to measure the inlet temperature and pressure of the main circuit regulating valve (21); a flow splitter assembly, the flow splitter assembly comprising an auxiliary circuit regulating valve (23), an auxiliary evaporator (16) and an air suction pressure regulating valve (24) connected in sequence, the auxiliary circuit regulating valve (23) being connected to an end of the auxiliary condenser (12) away from the auxiliary compressor (11), and the air suction pressure regulating valve (24) being connected to an air inlet of the auxiliary compressor (11); a third valve (33) disposed on a connecting pipe connecting the auxiliary condenser (12) and the flow meter (13); A second connecting pipe, one end of which is connected to an end of the auxiliary circuit regulating valve (23) close to the auxiliary evaporator (16), and the other end of which is connected to an end of the main circuit regulating valve (21) away from the subcooler (14); a fourth valve (34), which is arranged on the second connecting pipe; a fifth valve (35) disposed on a connecting pipe connecting the main circuit regulating valve (21) and the T1 measuring point (41); a third connecting pipe, one end of which is connected to an end of the flow meter (13) away from the subcooler (14), and the other end of which is connected to an end of the T1 measuring point (41) close to the main circuit regulating valve (21); a sixth valve (36), which is arranged on the third connecting pipe; a seventh valve (37) disposed on a connecting pipe connecting the back pressure regulating valve (22) and the auxiliary compressor (11); a fourth connecting pipe, one end of which is connected to the exhaust port of the auxiliary compressor (11), and the other end of which is connected to one end of the T2 measuring point (42) close to the back pressure regulating valve (22); an eighth valve (38), which is arranged on the fourth connecting pipe; A superheater (17) is arranged on the fourth connecting pipe and is located between the eighth valve (38) and the auxiliary compressor (11).

2. The refrigerant heat exchanger performance test system according to claim 1, characterized in that: Also includes: A T4 measuring point (44) is arranged at an end of the suction pressure regulating valve (24) away from the auxiliary evaporator (16) and is used to measure the temperature and pressure at the outlet side of the auxiliary evaporator (16).

3. The refrigerant heat exchanger performance testing system according to claim 1, characterized in that: Also includes: a fifth connecting pipe, one end of which is connected to one end of the main circuit regulating valve (21) close to the subcooler (14); A T5 measuring point (45), which is arranged at an end of the fifth connecting pipe away from the main circuit regulating valve (21); a ninth valve (39), which is arranged on the fifth connecting pipe; a sixth connecting pipe, one end of which is connected to an end of the main circuit regulating valve (21) away from the subcooler (14); a tenth valve (40), which is arranged on the sixth connecting pipe; a calorimeter (18), which is arranged on the sixth connecting pipe; A T6 measuring point (46), which is arranged at an end of the sixth connecting pipe away from the main circuit regulating valve (21); The heat exchanger to be tested (15) is an intermediate heat exchanger, and the intermediate heat exchanger is provided with a high-pressure inlet, a high-pressure outlet, a low-pressure inlet and a low-pressure outlet, the high-pressure inlet is connected to the T1 measuring point (41), the low-pressure outlet is connected to the T2 measuring point (42), the high-pressure outlet is connected to the T5 measuring point (45), and the low-pressure inlet is connected to the T6 measuring point (46).

4. The refrigerant heat exchanger performance test system according to claim 3, characterized in that: The heat exchanger (15) to be tested is a water-refrigerant heat exchanger, and the refrigerant heat exchanger performance test system also includes a circulating water unit. The water-refrigerant heat exchanger is connected to the circulating water unit, and the circulating water unit can provide circulating water with a preset temperature and a preset flow rate for the water-refrigerant heat exchanger.

5. The refrigerant heat exchanger performance testing system according to claim 3, characterized in that: The heat exchanger (15) to be tested is an air-refrigerant heat exchanger, and the air-refrigerant heat exchanger is provided with an air circulation system.

6. The refrigerant heat exchanger performance test system according to claim 5, characterized in that: It also includes an environmental chamber, in which the air-refrigerant heat exchanger is located.

7. The refrigerant heat exchanger performance testing system according to claim 6, characterized in that: A cooling coil and a heating tube are arranged in the environmental chamber. The cooling coil is used to cool the environmental chamber, and the heating tube is used to heat the environmental chamber.

8. The refrigerant heat exchanger performance testing system according to claim 1, characterized in that: It also includes a cooling water circulation unit, which includes a constant temperature water tank, a water pump and a regulating valve. The constant temperature water tank is externally connected to a circulating water circuit. The auxiliary condenser (12) is connected to the circulating water circuit. The circulating water circuit is provided with a water pump and a regulating valve for regulating the flow of water in the circulating water circuit.

Images