A cold charging test system and test method for phase change cold storage equipment

Abstract

The present invention discloses a cold charging test system and method for a phase change cold storage device. A coolant circulation loop is connected to the coolant flow channel of the phase change cold storage device for charging the phase change material. The main flow path of the coolant circulation loop is connected end to end along the direction of the coolant flow, with a coolant storage tank, a second valve, a coolant delivery pump, a fourth valve, an evaporator, a seventh valve, the phase change cold storage device, and a heater. Three bypass flow paths are provided on the coolant circulation loop. The main flow path and the bypass flow paths cooperate to realize cold charging of phase change cold storage devices of different sizes, realize precise control of the coolant inlet temperature of the phase change cold storage device, and ensure that the coolant inlet temperature and inlet flow rate of the phase change cold storage device reach target values. The present invention can realize the testing and verification of the cold charging performance and cold charging parameters of the phase change cold storage device, and can achieve the same initial conditions during the continuous cold charging process.

Description

Technical Field

[0001] The present invention relates to the technical field of cold charging and testing of phase change cold storage equipment, and in particular to a cold charging and testing system and method for phase change cold storage equipment. Background Art

[0002] Demand for low-temperature fresh-keeping distribution of fruits and vegetables, meat, poultry, eggs, seafood, flowers, and plants continues to expand. In addition to fresh produce delivery, the cold transportation of medical products such as vaccines, blood products, and biological pharmaceuticals is another major demand point for cold chain logistics. my country's cold chain transportation is primarily based on road transport. Currently, the vast majority of cold chain transport vehicles on the market still use refrigeration units to maintain cargo compartment temperature. This refrigeration method consumes a lot of fuel, produces a lot of exhaust emissions, and increases air pollution. Cold storage refrigeration, on the other hand, eliminates the need for refrigeration units on transport vehicles, generates no exhaust, and can utilize off-peak electricity prices to store cold.

[0003] The most critical part of a cold-storage cold chain transport vehicle is the cold storage equipment placed on the top of the vehicle compartment. The cold storage equipment is charged with cold before the vehicle performs its transportation mission. After the charging is completed, the vehicle performs its transportation mission. During the transportation mission, the cold storage equipment absorbs the heat generated by the items in the vehicle's cargo compartment, keeping the ambient temperature in the compartment constant.

[0004] The cold storage heat exchange equipment installed in cold chain transport vehicles, as a heat exchange equipment in the cold chain transportation process, its cold charging performance and cold charging parameters need to be tested and verified. Summary of the Invention

[0005] In order to overcome the above-mentioned defects in the prior art, the present invention provides a cold charging test system for a phase change cold storage device, which is used to test and verify the cold charging performance and cold charging parameters of the phase change cold storage device.

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

[0007] A cold charging test system for a phase change cold storage device comprises: a phase change cold storage device, and a coolant circulation loop connected to the phase change cold storage device; the phase change cold storage device comprises a coolant flow channel and a phase change material; the coolant circulation loop is connected to the coolant flow channel and is used to charge the phase change material with coolant; the main flow of the coolant circulation loop comprises: an evaporator, the phase change cold storage device, a heater, a coolant storage tank, and a coolant delivery pump;

[0008] Among them, the refrigerant outlet pipe of the evaporator is connected to the refrigerant flow channel inlet of the phase change cold storage device; the refrigerant flow channel outlet of the phase change cold storage device is connected to the refrigerant inlet pipe of the heater; the refrigerant outlet pipe of the heater is connected to the refrigerant storage tank inlet; the refrigerant storage tank outlet is connected to the inlet pipe of the refrigerant delivery pump; the outlet pipe of the refrigerant delivery pump is connected to the refrigerant inlet pipe of the evaporator.

[0009] Preferably, a first bypass flow path is provided on the coolant circulation loop;

[0010] The pipeline inlet end of the first bypass flow path is connected to the outlet pipeline of the brine delivery pump, and the pipeline outlet end of the first bypass flow path is connected to the inlet pipeline of the brine storage tank. A third valve is arranged on the first bypass flow path.

[0011] Preferably, a second bypass flow path is provided on the coolant circulation loop;

[0012] The pipe inlet end of the second bypass flow path is connected to the outlet pipe of the refrigerant delivery pump, and the pipe outlet end of the second bypass flow path is connected to the refrigerant outlet pipe of the evaporator. A fifth valve and a flow meter are arranged on the second bypass flow path.

[0013] Preferably, a third bypass flow path is provided on the coolant circulation loop;

[0014] The pipe inlet end of the third bypass flow path is connected to the coolant flow channel inlet of the phase change cold storage device, the pipe outlet end of the third bypass flow path is connected to the coolant flow channel outlet of the phase change cold storage device, and a sixth valve is arranged on the third bypass flow path.

[0015] Preferably, the refrigerant outlet pipe of the evaporator is connected to the refrigerant flow channel inlet in the phase change cold storage device through a seventh valve; the refrigerant storage tank outlet is connected to the inlet pipe of the refrigerant delivery pump through a second valve.

[0016] Preferably, the evaporator is used to cool the coolant flowing into the phase change cold storage device; the evaporator is connected to a refrigerant circulation circuit, and the refrigerant is used to cool the coolant;

[0017] The refrigerant circulation loop includes: an evaporator, a low-temperature compressor, a medium-temperature compressor, a gas cooler, and a liquid storage tank;

[0018] The refrigerant outlet pipeline of the evaporator is connected to the air intake of the low-temperature compressor, the air outlet of the low-temperature compressor is connected to the air intake of the medium-temperature compressor, the air outlet of the medium-temperature compressor is connected to the refrigerant inlet pipeline of the gas cooler, and the refrigerant outlet pipeline of the gas cooler is connected to the inlet pipeline of the liquid storage tank through a high-pressure electronic expansion valve; the liquid phase outlet pipeline of the liquid storage tank is connected to the refrigerant inlet pipeline of the evaporator through a low-pressure electronic expansion valve; the gas phase outlet pipeline of the liquid storage tank is also connected to the air intake of the medium-temperature compressor after being merged with the air outlet pipeline of the low-temperature compressor through an eighth valve.

[0019] Preferably, the coolant is an ethylene glycol aqueous solution, and the refrigerant is CO2.

[0020] Preferably, the heater is used to heat the coolant flowing out of the phase change cold storage device; the heater is connected to a water circulation loop, and uses hot water to heat the coolant;

[0021] The water circulation loop includes: a heater, a cooling tower, a first valve, and a water delivery pump; wherein the water outlet pipe of the heater is connected to the inlet pipe of the cooling tower, the outlet pipe of the cooling tower is connected to the inlet of the water delivery pump through the first valve, and the outlet of the water delivery pump is connected to the water inlet pipe of the heater.

[0022] Preferably, each circulation loop in the charging and cooling test system is provided with temperature, pressure and flow monitoring instruments.

[0023] The present invention also provides a method for testing a cold charging test system of a phase change cold storage device, comprising the following steps:

[0024] S1, assembling a phase change cold storage device, wherein a plurality of temperature sensors are provided in the phase change cold storage device;

[0025] S2, after the temperature and flow rate of the refrigerant outlet pipe of the evaporator are controlled by the cold charging test system to reach the set target values, the phase change cold storage device is connected to the cold charging test system to charge the phase change cold storage device with cold;

[0026] S3, during the cold charging process, the temperature and flow rate of the refrigerant outlet pipe of the evaporator are controlled by the cold charging test system to maintain the set target values, and the temperature distribution of the phase change material solidification process inside the phase change cold storage device is obtained by monitoring several temperature sensors inside the phase change cold storage device;

[0027] S4, using the temperature sensors in the phase change cold storage device (1) to determine whether the cold charging is completed. If the values ​​displayed by each temperature sensor are all lower than the freezing point temperature of the phase change material, that is, the phase change material in the phase change cold storage device has completely solidified, it means that the cold charging is completed.

[0028] The advantages of the present invention are:

[0029] (1) The cold charging test system of the present invention is used to charge a phase change cold storage device with cold, thereby realizing the test and verification of the cold charging performance and cold charging parameters of the phase change cold storage device.

[0030] (2) The present invention can be used to test the performance of refrigeration and freezing multi-temperature zone cold storage equipment, and the same initial conditions can be achieved during the continuous cold charging process.

[0031] (3) During the cold charging test of the phase change cold storage device, the cold charging of phase change cold storage devices of different sizes can be achieved through the main coolant path, the first bypass path and the second bypass path. The openings of the third valve, the fourth valve and the fifth valve are jointly adjusted to make the coolant flow entering the phase change cold storage device reach the target value, and monitoring is carried out through the flow monitoring instrument on the main coolant path and the flow meter on the second bypass path.

[0032] (4) During the cold charging test of the phase change cold storage device, the inlet temperature of the coolant of the phase change cold storage device can be accurately controlled through the main coolant path, the first bypass path and the second bypass path. The accurate control of the inlet temperature is very important for the comparative test.

[0033] (5) The refrigerant absorbs cold energy through the evaporator and its temperature decreases. When the temperature is lower than the target value of the inlet temperature of the phase change cold storage device, the openings of the fourth valve and the fifth valve are jointly adjusted, that is, the low-temperature refrigerant at different flow rates is mixed with the normal-temperature refrigerant using the second bypass flow path, so that the inlet temperature of the refrigerant of the phase change cold storage device reaches the target value, and is monitored by a temperature monitoring instrument.

[0034] (6) The present invention is provided with a heater and a water circulation loop to heat the refrigerant flowing out of the phase change cold storage device, so that the temperature of the refrigerant flowing into the refrigerant storage tank after circulation is the same as the temperature of the refrigerant flowing out, so that the refrigerant in the refrigerant storage tank maintains a constant temperature. Furthermore, the refrigerant inlet temperature of the evaporator is constant, and the refrigerant temperature of the second bypass flow path in the refrigerant circulation loop is constant. The refrigerant inlet temperature of the phase change cold storage device depends on the refrigerant flow rate in the evaporator and the refrigerant flow rate in the second bypass flow path in the refrigerant circulation loop. The adjustment variables are reduced, which can greatly shorten the debugging time, is conducive to the stability of the inlet temperature of the phase change cold storage device, and further conducive to the stable operation of the test system.

[0035] (7) The present invention requires that the inlet temperature and inlet flow rate reach the set target values ​​before the phase change cold storage device is subjected to the cold charging test. Before the phase change cold storage device is subjected to the cold charging test, if the inlet temperature and inlet flow rate do not reach the target values, the phase change cold storage device is not involved in the experimental cycle through the main coolant flow path, the first bypass flow path, the second bypass flow path and the third bypass flow path. When the inlet flow rate and inlet temperature of the phase change cold storage device reach the target values, it is connected to the experimental system for the experiment, thereby avoiding the influence of the debugging process on the temperature field of the phase change cold storage device, and achieving the same initial conditions in the comparative experiment.

[0036] (8) During the cold charging process, the cold charging test system is used to control the temperature and flow rate in the refrigerant outlet pipe of the evaporator to maintain the set target values, and by monitoring several temperature sensors inside the phase change cold storage device, the temperature distribution during the solidification process of the phase change material inside the phase change cold storage device is obtained, thereby realizing the test verification of the cold charging performance and cold charging parameters of the phase change cold storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of a cold charging test system for a phase change cold storage device.

[0038] Figure 2 The present invention is a flow chart of a cold charging test method for a phase change cold storage device.

[0039] Figure 3 Schematic diagram of a phase change cold storage device, where: Figure 3 a is the main view of the phase change cold storage device, and Figure 3b is the AA direction schematic diagram of the phase change cold storage device. Figure 3 c is a schematic diagram of the phase change cold storage equipment in the BB direction.

[0040] Figure 4 Schematic diagram of the opening in the connecting plate.

[0041] Description of reference numerals:

[0042] 1-Phase change cold storage device; 2-Cooling tower; 3-First valve; 4-Water delivery pump; 5-Heater; 6-Ethylene glycol aqueous solution storage tank; 7-Second valve; 8-Refrigerant delivery pump; 9-Third valve; 10-Fourth valve; 11-Evaporator; 12-Fifth valve; 13-Sixth valve; 14-Seventh valve; 15-CO2 low-temperature compressor; 16-CO2 medium-temperature compressor; 17-Gas cooler; 18-Electronic expansion valve; 19-Eighth valve; 20-Liquid storage tank; 21-Electronic expansion valve;

[0043] 1-1 Inlet pipe; 1-2A Inlet manifold; 1-2B Intermediate manifold; 1-2C Outlet manifold; 1-3 Heat transfer tube; 1-4A, 1-4B Corrugated plates; 1-5A, 1-5B, 1-5C Connecting plates; 1-6A, 1-6B, 1-6C, 1-6D, 1-6E Outer frame plates; 1-7 Outlet pipe. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] Example 1

[0046] Depend on Figure 1 As shown, a cold charging test system for a phase change cold storage device includes: a phase change cold storage device 1, and a coolant circulation loop connected to the phase change cold storage device 1; wherein, the phase change cold storage device 1 includes a coolant flow channel and a phase change material; the coolant circulation loop is connected to the coolant flow channel, and is used to charge the phase change material with cold; in this embodiment, the coolant is an ethylene glycol aqueous solution.

[0047] The brine circulation circuit includes a brine main flow path and a brine bypass flow path.

[0048] The brine main flow path includes a brine tank 6, a second valve 7, a brine pump 8, a third valve 9, a fourth valve 10, an evaporator 11, a fifth valve 12, a sixth valve 13, a seventh valve 14, a phase-change cold storage device 1, and a heater 5. The brine tank 6 outlet pipe is connected to the second valve 7 inlet pipe, which in turn is connected to the brine pump 8 inlet pipe. The brine is powered by the pump 8. The pump 8 outlet pipe is connected to the fourth valve 10 inlet pipe, which is connected to the evaporator 11 brine inlet pipe. The evaporator 11 brine outlet pipe is connected to the seventh valve 14 inlet pipe, which is connected to the phase-change cold storage device 1 inlet pipe. The phase-change cold storage device 1 outlet pipe is connected to the brine inlet pipe of the heater 5, which in turn is connected to the brine tank 6 inlet pipe, forming the brine main flow path. Temperature, pressure, and flow rate monitoring instruments are installed in the brine main flow path.

[0049] The brine bypass flow path includes: a first bypass flow path, a second bypass flow path, and a third bypass flow path.

[0050] The inlet of the first bypass flow path is connected to the outlet pipe of the brine delivery pump 8, and the outlet is connected to the inlet pipe of the brine storage tank 6. A third valve 9 is installed on the first bypass flow path. The inlet of the second bypass flow path is connected to the outlet pipe of the brine delivery pump 8, and the outlet is connected to the main pipe at the rear end of the main flow path evaporator 11. A fifth valve 12 and a flow meter are installed on the second bypass flow path. The inlet of the third bypass flow path is connected to the inlet of the seventh valve 14, and the outlet is connected to the brine outlet pipe of the phase change cold storage device 1. A sixth valve 13 is installed on the third bypass flow path.

[0051] The inlet and outlet pipes of the coolant flow channel of the phase change cold storage device 1 are connected to the system pipeline through flanges, which can realize the switching of different phase change cold storage devices.

[0052] During the cold charging process of the phase change cold storage device 1, cold charging of phase change cold storage devices 1 of different sizes can be achieved through the main coolant path, the first bypass path and the second bypass path. The openings of the third valve 9, the fourth valve 10 and the fifth valve 12 are jointly adjusted to make the coolant flow entering the phase change cold storage device 1 reach the target value, and monitoring is carried out through the flow monitoring instrument on the main coolant path and the flow meter on the second bypass path.

[0053] During the cold charging process of the phase change cold storage device 1, the coolant inlet temperature of the phase change cold storage device 1 can be accurately controlled through the coolant main flow path, the first bypass flow path and the second bypass flow path. Accurate control of the inlet temperature is very important for comparative tests.

[0054] The refrigerant absorbs cold energy through the evaporator 11 and its temperature decreases. When the temperature is lower than the target value of the inlet temperature of the phase change cold storage device 1, the openings of the fourth valve 10 and the fifth valve 12 are jointly adjusted to mix the low-temperature refrigerant at different flow rates with the normal-temperature refrigerant so that the inlet temperature of the refrigerant of the phase change cold storage device 1 reaches the target value and is monitored by a temperature monitoring instrument.

[0055] During the debugging process before the experimental test of the phase change cold storage device 1, when the inlet temperature and inlet flow rate do not reach the target value, the phase change cold storage device 1 is not involved in the experimental cycle through the main coolant path, the first bypass path, the second bypass path and the third bypass path.

[0056] When the inlet flow and inlet temperature of the phase change cold storage device 1 reach the target values, it is connected to the experimental system for experiment to avoid the impact of the debugging process on the temperature field of the phase change cold storage device 1, and the same initial conditions can be achieved in the comparative experiment.

[0057] The evaporator 11 is a brine-refrigerant heat exchanger for cooling the brine flowing into the phase change cold storage device 1. In this embodiment, the refrigerant is CO2.

[0058] The evaporator 11 is connected to a refrigerant circulation circuit, which includes the evaporator 11, a CO2 low-temperature compressor 15, a CO2 medium-temperature compressor 16, a gas cooler 17, a high-pressure electronic expansion valve 18, an eighth valve 19, a liquid storage tank 20, and a low-pressure electronic expansion valve 21. The refrigerant outlet pipeline of evaporator 11 is connected to the intake port of low-temperature CO2 compressor 15. The exhaust pipeline of low-temperature CO2 compressor 15 is connected to the gas phase pipeline of liquid storage tank 20 and then connected to the intake port of medium-temperature CO2 compressor 16. An eighth valve 19 is installed on the gas phase pipeline of liquid storage tank 20. The exhaust pipeline of medium-temperature CO2 compressor 16 is connected to the refrigerant inlet pipeline of gas cooler 17. The refrigerant outlet pipeline of gas cooler 17 is connected to the inlet pipeline of high-pressure electronic expansion valve 18. The outlet pipeline of high-pressure electronic expansion valve 18 is connected to the inlet pipeline of liquid storage tank 20. The liquid phase outlet pipeline of liquid storage tank 20 is connected to the inlet pipeline of low-pressure electronic expansion valve 21. The outlet pipeline of low-pressure electronic expansion valve 21 is connected to the refrigerant inlet pipeline of evaporator 11. The refrigerant circulation loop is equipped with temperature, pressure, and flow monitoring instruments.

[0059] In this embodiment, the refrigerant evaporation temperature is -35°C, and the gas cooler 17 is a CO2-air heat exchanger. The CO2 at the outlet of the CO2 medium-temperature compressor 16 releases heat through the gas cooler 17 before entering the high-pressure electronic expansion valve 18, where it is throttled, and then enters the liquid storage tank 20. The liquid CO2 in the liquid storage tank 20 enters the low-pressure electronic expansion valve 21, where it is further throttled, bringing the evaporation temperature in the evaporator 11 to -35°C. Within the evaporator 11, the CO2 absorbs heat from the refrigerant, raising its temperature. It then enters the CO2 low-temperature compressor 15, where it is heated and pressurized. The CO2 then merges with the gaseous CO2 in the liquid storage tank 20, enters the CO2 medium-temperature compressor 16, where it is further heated and pressurized, and then continues to cool in the gas cooler 17.

[0060] The heater 5 is a coolant-water heat exchanger, which is used to heat the coolant flowing out of the phase change cold storage device 1; the heater 5 is connected to a water circulation loop.

[0061] The water circulation loop includes a cooling tower 2, a first valve 3, a water delivery pump 4, and a heater 5. The outlet of the cooling tower 2 is connected to the inlet pipe of the first valve 3 via a pipe, the outlet pipe of the first valve 3 is connected to the inlet pipe of the water delivery pump 4, the outlet pipe of the water delivery pump 4 is connected to the water inlet pipe of the heater 5, and the water outlet pipe of the heater 5 is connected to the inlet pipe of the cooling tower 2.

[0062] The water circulation loop heats the refrigerant flowing out of the phase change cold storage device 1, so that the temperature of the refrigerant flowing into the refrigerant storage tank 6 after circulation is the same as the temperature of the refrigerant flowing out, so that the refrigerant in the refrigerant storage tank 6 maintains a constant temperature. Furthermore, the refrigerant inlet temperature of the evaporator 11 is constant, and the refrigerant temperature of the second bypass flow path in the refrigerant circulation loop is constant. The refrigerant inlet temperature in the phase change cold storage device 1 depends on the refrigerant flow in the evaporator 11 and the refrigerant flow in the second bypass flow path in the refrigerant circulation loop. The adjustment variables are reduced, which can greatly shorten the debugging time, is conducive to the stability of the inlet temperature of the phase change cold storage device 1, and thus is conducive to the stable operation of the test system.

[0063] Example 2

[0064] Depend on Figure 2 As shown, based on the cold charging test system of Example 1, a cold charging test is performed on the phase change cold storage device, including the following steps:

[0065] S1, assembling the phase change cold storage device 1. The phase change cold storage device 1 is provided with several temperature sensors. According to the experimental test content, the phase change cold storage device 1 is connected to the test system pipeline through a flange to ensure that each circulation loop can operate normally.

[0066] S2, start the refrigeration cycle: open the eighth valve 19, start the CO2 low-temperature compressor 15 and the CO2 medium-temperature compressor 16, and jointly adjust the high-pressure electronic expansion valve 18 and the low-pressure electronic expansion valve 21 to make the refrigerant inlet temperature of the evaporator 11 reach -35°C and the refrigerant flow rate reach the target value;

[0067] S3, start the water circulation loop: open the first valve 3 and start the water delivery pump 4;

[0068] S4, start the coolant circulation loop:

[0069] S41, close the fourth valve 10, the fifth valve 12, and the seventh valve 14, open the second valve 7 and the third valve 9, and start the coolant delivery pump 8;

[0070] S42: After the pump is operating stably, adjust the openings of the fourth valve 10 and the fifth valve 12, monitor the flow rate of the brine output pipe of the evaporator 11 and the flow rate of the second bypass flow path, and monitor the value of the temperature sensor on the brine main flow path connected to the inlet pipe of the sixth valve 13, so that the flow rate and temperature entering the third bypass flow path reach the target values. Simultaneously, adjust the first valve 3 so that the inlet temperature of the brine storage tank 6 is equal to the outlet temperature.

[0071] S43, opening the seventh valve 14, closing the sixth valve 13, and charging the phase change cold storage device 1;

[0072] During the cold charging process, the cold charging test system is used to control the temperature and flow rate in the refrigerant outlet pipe of the evaporator 11 to maintain the set target values, and by monitoring several temperature sensors inside the phase change cold storage device 1, the temperature distribution during the solidification process of the phase change material inside the phase change cold storage device 1 is obtained.

[0073] S5. When the display values ​​of the temperature sensors in the phase change cold storage device 1 are all lower than the freezing point temperature value of the phase change material used, it indicates that the phase change material inside the phase change cold storage device 1 has been completely solidified, that is, the cold charging is completed; after the phase change cold storage device 1 is completed, the refrigerant delivery pump 8 is stopped and the second valve 7 is closed; the water delivery pump 4 is stopped and the first valve 3 is closed; the CO2 low-temperature compressor 15 and the CO2 medium-temperature compressor 16 are stopped.

[0074] In this embodiment, data collection and monitoring are carried out throughout the entire debugging and testing process. Before the experiment, the flow rate, temperature, and pressure of the medium in the refrigerant and coolant-related pipelines in the system need to be monitored to determine whether the system operation is stable; by monitoring the temperature of the phase change material in the phase change cold storage device 1, it can be determined whether its charging and cooling process is completed.

[0075] Example 3:

[0076] Depend on Figure 3 As shown in Figures 3a, 3b, and 3c, a phase-change cold storage device comprises a coolant flow channel and a phase-change material storage space; the coolant flow channel is a multi-return flow channel within the phase-change cold storage device; the phase-change material storage space is the space within the phase-change cold storage device excluding the coolant flow channel, i.e., the phase-change material storage space is composed of the coolant flow channel and the shell of the phase-change cold storage device; corrugated plates are connected between the coolant flow channels and between the coolant flow channel and the shell in the phase-change cold storage space, and the corrugated plates are fixedly connected by connecting plates;

[0077] The coolant flow channel includes an inlet pipe 1-1, a liquid collecting pipe, a heat transfer pipe 1-3, and an outlet pipe 1-7.

[0078] The coolant enters the phase-change cold storage device 1 from the external pipeline through the inlet pipe 1 - 1 and flows out of the phase-change cold storage device 1 to the external pipeline through the outlet pipe 1 - 7 .

[0079] The collecting pipes are all rectangular tubes, including an inlet collecting pipe 1-2A, an intermediate collecting pipe 1-2B, and an outlet collecting pipe 1-2C; the liquid inlet end of the inlet collecting pipe 1-2A is connected to the inlet connecting pipe 1-1, the liquid outlet end of the inlet collecting pipe 1-2A is connected to the liquid inlet end of the heat transfer pipe 1-3, the liquid outlet end of the heat transfer pipe 1-3 is connected to the liquid inlet end of the intermediate collecting pipe 1-2B, the liquid outlet end of the intermediate collecting pipe 1-2B is connected to the liquid inlet end of the next heat transfer pipe 1-3, the liquid outlet end of the next heat transfer pipe 1-3 is connected to the liquid inlet end of the next intermediate collecting pipe 1-2B, the liquid outlet end of the last heat transfer pipe 1-3 is connected to the liquid inlet end of the outlet collecting pipe 1-2C, and the liquid outlet end of the outlet collecting pipe 1-2C is connected to the outlet connecting pipe 1-7; the coolant channel is a meandering multi-return flow path in the phase change cold storage device 1.

[0080] The heat transfer tubes 1-3 are rectangular parallelepipeds, and contain a plurality of parallel channels therein. The axes of the parallel channels are consistent with the flow direction of the coolant. The cross sections of the plurality of parallel channels can be circular, oblong, rectangular, square, etc.

[0081] The phase change material storage space is composed of a liquid collecting pipe, heat transfer pipes 1-3, a corrugated plate, a connecting plate, and an outer frame plate.

[0082] The corrugated plate includes a corrugated plate 1-4A welded between the heat transfer tube 1-3 and the outer frame plate 1-6B and a corrugated plate 1-4B welded between two adjacent heat transfer tubes 1-3.

[0083] The connecting plates include connecting plates 1-5A and 1-5B welded between adjacent corrugated plates 1-4A and 1-4B, and a connecting plate 1-5C welded between the corrugated plate 1-4B and the intermediate liquid collecting pipe 1-2B; Figure 4 As shown, a number of small holes are opened on the connecting plate, and the cross-section of the small holes can be various shapes such as square, rectangular, circular, elliptical, etc.

[0084] The outer frame plate includes plate 1-6A, plate 1-6B, plate 1-6C, plate 1-6D, and plate 1-6E; plate 1-6C has a hole, and the outer wall at the hole is connected to the inlet pipe 1-1 and the outlet pipe 1-7 respectively, and the inner wall at the hole is connected to the inlet collecting pipe 1-2A and the outlet collecting pipe 1-2C respectively; there are several ribs on the outer wall of plate 1-6E.

[0085] In this embodiment, the phase change cold storage device 1 is placed on the top of the cargo compartment, the outer frame plate 1-6D is connected to the top of the compartment, and the outer frame plate 1-6E is located above the cargo. The heat exchange between the phase change cold storage device 1 and the heat source in the cargo compartment is mainly concentrated on the outer frame plate 1-6E.

[0086] In this embodiment, the collecting pipe, heat transfer tubes 1-3, corrugated plates, connecting plates, and outer frame plates form a honeycomb storage space. The openings in the connecting plates connect adjacent honeycomb spaces. In terms of thermal performance, the phase change material has a very low thermal conductivity. The corrugated plates and connecting plates enhance heat transfer between the phase change materials, shortening the cooling time. Structurally, the corrugated plates and connecting plates reinforce the heat transfer tubes and outer frame plates.

[0087] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A cold charging test system for phase change cold storage equipment, characterized in that: include: A phase-change cold storage device (1), and a coolant circulation loop connected to the phase-change cold storage device (1); the phase-change cold storage device (1) comprises a coolant flow channel and a phase-change material; The brine circulation loop is connected to the brine flow channel and is used to charge the phase change material with cold. The main flow path of the brine circulation loop includes: an evaporator (11), a phase change cold storage device (1), a heater (5), a brine storage tank (6), and a brine delivery pump (8). The refrigerant outlet pipe of the evaporator (11) is connected to the refrigerant flow channel inlet of the phase-change cold storage device (1); the refrigerant flow channel outlet of the phase-change cold storage device (1) is connected to the refrigerant inlet pipe of the heater (5); the refrigerant outlet pipe of the heater (5) is connected to the inlet of the refrigerant storage tank (6); the outlet of the refrigerant storage tank (6) is connected to the inlet pipe of the refrigerant delivery pump (8); the outlet pipe of the refrigerant delivery pump (8) is connected to the refrigerant inlet pipe of the evaporator (11); The brine circulation loop is provided with a first bypass flow path; The pipe inlet end of the first bypass flow path is connected to the outlet pipe of the coolant delivery pump (8), and the pipe outlet end of the first bypass flow path is connected to the inlet pipe of the coolant storage tank (6). A third valve (9) is arranged on the first bypass flow path; A second bypass flow path is provided on the brine circulation circuit; The pipe inlet end of the second bypass flow path is connected to the outlet pipe of the coolant delivery pump (8), and the pipe outlet end of the second bypass flow path is connected to the coolant outlet pipe of the evaporator (11). A fifth valve (12) and a flow meter are arranged on the second bypass flow path; A third bypass flow path is provided on the brine circulation circuit; The pipeline inlet end of the third bypass flow path is connected to the coolant flow path inlet of the phase change cold storage device (1), and the pipeline outlet end of the third bypass flow path is connected to the coolant flow path outlet of the phase change cold storage device (1), and a sixth valve (13) is arranged on the third bypass flow path; The heater (5) is used to heat the coolant flowing out of the phase-change cold storage device (1); the heater (5) is connected to a water circulation loop, and uses hot water to heat the coolant.

2. A cold charging test system for a phase change cold storage device according to claim 1, characterized in that: The refrigerant outlet pipe of the evaporator (11) is connected to the refrigerant flow channel inlet in the phase change cold storage device (1) through a seventh valve (14); the outlet of the refrigerant storage tank (6) is connected to the inlet pipe of the refrigerant delivery pump (8) through a second valve (7).

3. The cold charging test system for phase change cold storage equipment according to claim 1, characterized in that: The evaporator (11) is used to cool the coolant flowing into the phase-change cold storage device (1); the evaporator (11) is connected to a refrigerant circulation circuit, and the refrigerant is used to cool the coolant; The refrigerant circulation circuit includes: an evaporator (11), a low-temperature compressor (15), a medium-temperature compressor (16), a gas cooler (17), and a liquid storage tank (20); The refrigerant outlet pipeline of the evaporator (11) is connected to the air intake of the low-temperature compressor (15), the air outlet of the low-temperature compressor (15) is connected to the air intake of the medium-temperature compressor (16), the air outlet of the medium-temperature compressor (16) is connected to the refrigerant inlet pipeline of the gas cooler (17), and the refrigerant outlet pipeline of the gas cooler (17) is connected to the inlet pipeline of the liquid storage tank (20) through a high-pressure electronic expansion valve (18); the liquid phase outlet pipeline of the liquid storage tank (20) is connected to the refrigerant inlet pipeline of the evaporator (11) through a low-pressure electronic expansion valve (21); the gas phase outlet pipeline of the liquid storage tank (20) is also connected to the air intake of the medium-temperature compressor (16) after being merged with the air outlet pipeline of the low-temperature compressor (15) through an eighth valve (19).

4. A cold charging test system for a phase change cold storage device according to claim 3, characterized in that: The coolant is ethylene glycol aqueous solution, and the refrigerant is CO2.

5. The cold charging test system for phase change cold storage equipment according to claim 1, characterized in that: The water circulation loop comprises: a heater (5), a cooling tower (2), a first valve (3), and a water delivery pump (4); wherein the water outlet pipeline of the heater (5) is connected to the inlet pipeline of the cooling tower (2), the outlet pipeline of the cooling tower (2) is connected to the inlet of the water delivery pump (4) through the first valve (3), and the outlet of the water delivery pump (4) is connected to the water inlet pipeline of the heater (5).

6. A cold charging test system for a phase change cold storage device according to any one of claims 1 to 5, characterized in that: Each circulation loop in the charging and cooling test system is equipped with temperature, pressure and flow monitoring instruments.

7. A test method for a cold charging test system of a phase change cold storage device according to claim 6, characterized in that: The following steps are involved: S1, assembling a phase-change cold storage device (1), wherein a plurality of temperature sensors are provided in the phase-change cold storage device (1); S2, after the temperature and flow rate of the refrigerant outlet pipe of the evaporator (11) are controlled by the cold charging test system to reach the set target values, the phase change cold storage device (1) is connected to the cold charging test system to charge the phase change cold storage device (1); S3, during the cold charging process, the temperature and flow rate in the coolant outlet pipe of the evaporator (11) are controlled by the cold charging test system to maintain the set target values, and the temperature distribution of the phase change material in the phase change cold storage device (1) during the solidification process is obtained by monitoring a plurality of temperature sensors inside the phase change cold storage device (1); S4, using the temperature sensors in the phase change cold storage device (1) to determine whether the cold charging is completed, if the values ​​displayed by each temperature sensor are all lower than the freezing point temperature value of the phase change material, that is, the phase change material in the phase change cold storage device (1) has completely solidified, it means that the cold charging is completed.

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