A pressurized ultra-high temperature heat pump test bench

Abstract

The present invention discloses a pressurized ultra-high temperature heat pump test bench, including a hot water circulation module, a water replenishment boosting and voltage stabilizing module, a cold water circulation module and a cooling circulation module, each circulation module operates independently; a cold and hot balance heat exchanger is used between the hot water circulation module and the cold water circulation module to balance the heat loss in the cold water circulation module; a heat dissipation heat exchanger is used between the hot water circulation module and the cooling circulation module to balance the heat gain in the hot water circulation module; the water replenishment boosting and voltage stabilizing module is connected to the hot water circulation module to increase the pressure of the hot water circulation module. The heat pump test bench of the present invention adopts a self-thermal balance mode to achieve self-sufficiency in heat absorption and heat release during the entire circulation test process, reducing energy consumption during the test process; it also achieves pressure increase in the hot water circulation module, which can meet the ultra-high temperature heat pump test requirements above 100°C.

Description

Technical Field

[0001] The invention belongs to the fields of refrigeration, air conditioning and heat pumps, and in particular relates to a pressurized ultra-high temperature heat pump test bench. Background Art

[0002] As the social economy enters a new normal, energy conservation and environmental protection are becoming increasingly important in the energy system under the new situation. It is an important cornerstone for building a clean, low-carbon, safe and efficient modern energy system, and industrial waste heat recovery is an important part of it. A large amount of industrial waste heat is generated in industrial production. Direct discharge not only causes thermal pollution but also wastes energy. Therefore, it is necessary to recycle and reuse it. Heat pump is one of the recycling technologies. However, the heat pumps in the existing technology are all medium and low temperature air conditioning heat pumps, and their outlet water temperatures are relatively low, which cannot meet the high temperature requirements of industrial production activities for 100°C and above.

[0003] Based on market status and demand, many manufacturers at home and abroad are currently developing ultra-high temperature heat pump units to recycle waste heat resources above 35°C generated during industrial production. The hot water provided can reach a maximum temperature of 120°C or above. In conjunction with related equipment, steam can be directly supplied to meet the high temperature needs of industrial production.

[0004] The development of ultra-high temperature heat pump units inevitably requires a matching test bench for testing. However, since traditional chiller test benches are all operated under low temperature test conditions, the hot water temperature cannot even be maintained above 80°C for a long time, let alone meet the water temperature test above 100°C. Therefore, the pressurized ultra-high temperature heat pump test bench came into being, providing a hardware foundation for the testing and improvement of ultra-high temperature heat pump units. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a pressurized ultra-high temperature heat pump test bench that can test ultra-high temperature heat pump units with water outlet temperatures above 100°C without flash evaporation.

[0006] Technical solution: The present invention includes a hot water circulation module, a water replenishment, boosting and pressure stabilizing module, a cold water circulation module and a cooling circulation module, and each circulation module operates independently; a cold-heat balance heat exchanger is used between the hot water circulation module and the cold water circulation module to balance the heat loss in the cold water circulation module; a heat dissipation heat exchanger is used between the hot water circulation module and the cooling circulation module to balance the heat gain in the hot water circulation module; the water replenishment, boosting and pressure stabilizing module is connected to the hot water circulation module to increase the pressure of the hot water circulation module.

[0007] The hot water circulation module is driven by a hot water circulation pump, and the outlet of the hot water circulation pump is connected to the condenser of the test unit; the outlet of the condenser of the test unit is connected to an electric three-way regulating valve; the electric three-way regulating valve is a diversion type three-way valve, one branch is connected to the electric heater and the stop valve, and the other branch is connected to the cold and hot balance heat exchanger and the stop valve. After the two branches are merged, they are connected to the inlet of the hot water circulation pump through the heat dissipation heat exchanger.

[0008] The water replenishment, boosting and stabilizing module includes two parts: water replenishment and pressure stabilization. The water replenishment part includes a Y-type filter, a water replenishment boosting pump, and a one-way valve connected in series; the pressure stabilizing part includes a pressure-stabilizing diaphragm expansion tank and a stop valve connected in series. The water replenishment part and the pressure stabilizing part are connected to the hot water circulation module.

[0009] The cold water circulation module is driven by a cold water circulation pump, and its outlet is connected to a rubber hose, a one-way valve, an electromagnetic flowmeter, and a metal hose in sequence, and then connected to the evaporator of the test unit; the outlet of the test unit evaporator is connected to the hot and cold balance heat exchanger through a metal hose and a stop valve; a Y-type filter, a stop valve and a rubber hose are connected between the outlet of the hot and cold balance heat exchanger and the inlet of the cold water circulation pump.

[0010] The cooling circulation module is driven by a cooling water circulation pump, and its outlet is connected in sequence with a rubber flexible joint, a stop valve, a one-way valve, a stop valve, a rubber hose and an electric three-way regulating valve; the electric three-way regulating valve in the cooling circulation module is a diversion type three-way valve, the first branch connects the stop valve and the heat dissipation heat exchanger, and the second branch directly converges with the first branch at the outlet of the heat dissipation heat exchanger, and after convergence, it is connected to the inlet of the cooling water circulation pump through a rubber hose, a stop valve, a cooling tower and a constant temperature water tank.

[0011] The hot water circulation module, the cold water circulation module and the cooling circulation module are all provided with exhaust valves at their highest relative points. The inlet and outlet pipes of the test unit condenser are provided with pressure sensors and temperature sensors for measuring the inlet and outlet water temperature and water pressure of the test unit condenser, so as to adjust the system operation status according to the measured values.

[0012] A safety valve is provided at the outlet connection of the hot water circulation module and the test unit condenser to prevent the water pressure of the test bench from accidentally decreasing, causing flash evaporation and exhaust pressure reduction of high-temperature hot water, thereby ensuring the safety of system operation.

[0013] The inlet and outlet pipes of the test unit evaporator are both provided with pressure sensors and temperature sensors for measuring the inlet and outlet water temperature and water pressure of the test unit evaporator, and adjusting the system operation state according to the measured values.

[0014] An expansion water tank is provided in the cold water circulation module to bear the volume change of the cold water in the circulation pipeline caused by the rapid change of temperature.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following beneficial effects: (1) the hot water circulation module is pressurized and the overall high-temperature design is adopted, which can meet the test of ultra-high temperature hot water or steam heat pump with an outlet water temperature of more than 100°C; (2) a self-thermal balance mode is adopted, and heat balance is achieved between the hot water circulation module and the cold water circulation module through a heat exchanger, and excess heat is dissipated and balanced by the heat exchanger between the hot water circulation module and the cooling circulation module, thereby reducing the total energy consumption of the entire system and improving the energy efficiency of the entire test bench. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the present invention. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods and the accompanying drawings.

[0018] like Figure 1 As shown, the present invention includes a hot water circulation module, a water replenishment boosting and pressure stabilizing module, a cold water circulation module and a cooling circulation module. A cold and hot balance heat exchanger 23 is used between the hot water circulation module and the cold water circulation module to balance the heat loss in the cold water circulation module; a heat dissipation heat exchanger 15 is used between the hot water circulation module and the cooling circulation module to balance the heat gain in the hot water circulation module; the water replenishment boosting and pressure stabilizing module is connected to the hot water circulation module to increase the pressure of the hot water circulation module. An exhaust valve 21 is provided at the relative highest point of the hot water circulation module, the cold water circulation module and the cooling circulation module. The exhaust valve can automatically remove the gas in the pipeline system to avoid negative problems such as pipeline corrosion, water pump corrosion, reduced water pump performance, component damage, etc. caused by the presence of air.

[0019] The hot water circulation module is driven by a hot water circulation pump 10, and its outlet is connected with a rubber flexible joint 9, a stop valve 3, a check valve 5, an electromagnetic flowmeter 4, a stop valve 3, a metal hose 2 in sequence, and finally connected to the test unit condenser 1. The inlet and outlet of the hot water circulation pump 10 are provided with a pressure gauge 8 for monitoring the operation status of the hot water circulation pump. The outlet of the hot water circulation pump 10 is provided with a drain ball valve 7 for discharging the accumulated water in the circulation pipeline after shutdown to prevent the pipeline from being rusted. The inlet and outlet pipes of the test unit condenser 1 are provided with a pressure sensor 12 and a temperature sensor 13 for measuring the inlet and outlet water temperature and water pressure of the test unit condenser, and adjusting the system operation status according to the measured values. The hot water absorbs heat from the test unit condenser 1, and the hot water after heat exchange comes out of the test unit condenser 1 and returns to the hot water circulation module of the test bench again. A safety valve 26 is installed on the pipe between the outlet of the test unit condenser 1 and the hot water circulation module to prevent the flash exhaust pressure reduction of high-temperature hot water caused by accidental reduction of the water pressure of the test bench, so as to ensure the safety of system operation. The circulating hot water then passes through the metal hose 2 and the stop valve 3 in sequence to reach the electric three-way regulating valve 16. The electric three-way regulating valve 16 is a diversion type three-way valve, which diverts the hot water into two paths, one path passes through the electric heater 25 and the stop valve 3; the other path passes through the cold and hot balance heat exchanger 23 and the stop valve 3, after which the diverted hot water is gathered again, passes through the stop valve 3, the heat dissipation heat exchanger 15, the Y-type filter 11, the stop valve 3 and the rubber flexible joint 9, and finally returns to the inlet of the hot water circulation pump 10. A temperature sensor 13 is set at the outlet of the heat dissipation heat exchanger 15 to monitor the temperature of the hot water after heat dissipation, so as to ensure the stability of the temperature of the hot water circulating into the condenser 1 of the test unit.

[0020] The water replenishment boosting and pressure stabilizing module consists of two parts: water replenishment and pressure stabilizing. The water replenishment part includes a Y-type filter 11, a rubber flexible joint 9, a water replenishment boosting pump 14, a rubber flexible joint 9, a stop valve 3, a check valve 5 and a stop valve 3 connected in series, and finally merges into the hot water circulation module. The water replenishment part starts from the water replenishment source, and the water flows through the Y-type filter 11 and the rubber flexible joint 9 in turn into the water replenishment boosting pump 14. The boosted water flows through the rubber flexible joint 9, the stop valve 3, the check valve 5 and the stop valve 3 in turn, and finally merges into the hot water circulation module. Among them, a pressure gauge 8 is provided at the outlet of the water replenishment boosting pump 14 to monitor the operating status of the water replenishment boosting pump. The pressure stabilizing part includes a pressure stabilizing diaphragm expansion tank 6 and a stop valve 3 connected in series. A pressure sensor 12 is provided at the connection between the water replenishment boosting and pressure stabilizing module and the hot water circulation module. The measured pressure value is used to control the operation of the water replenishment boosting pump to ensure the minimum pressure of the hot water circulation module.

[0021] The cold water circulation module is driven by a cold water circulation pump 24, and its outlet is connected with a rubber flexible joint 9, a stop valve 3, a check valve 5, an electromagnetic flowmeter 4, a stop valve 3, and a metal hose 2 in sequence, and then connected to the test unit evaporator 27. The inlet and outlet of the cold water circulation pump 24 are provided with a pressure gauge 8 for monitoring the operation status of the cold water circulation pump. The outlet of the cold water circulation pump 24 is provided with a drain ball valve 7 for discharging the accumulated water in the circulation pipeline after shutdown to prevent the pipeline from being rusted. The inlet and outlet pipes of the test unit evaporator 27 are provided with a pressure sensor 12 and a temperature sensor 13 for measuring the inlet and outlet water temperature and water pressure of the test unit evaporator, and adjusting the system operation status according to the measured values. The outlet of the test unit evaporator 27 is connected to the cold and hot balance heat exchanger 23 through a metal hose 2 and a stop valve 3, and a Y-type filter 11, a stop valve 3 and a rubber flexible joint 9 are connected between the outlet of the cold and hot balance heat exchanger 23 and the inlet of the cold water circulation pump 24. The circulating cold water releases heat to the test unit evaporator 27. The cold water after heat exchange comes out of the test unit evaporator 27, passes through the metal hose 2 and the stop valve 3 in turn to reach the cold and hot balance heat exchanger 23, absorbs heat from the hot water circulation through the cold and hot balance heat exchanger 23, and balances the heat released in the test unit evaporator 27. A temperature sensor 13 is provided at the outlet of the cold and hot balance heat exchanger 23 to monitor the temperature of the cold water after absorbing heat and ensure the stability of the temperature of the cold water circulating into the test unit evaporator. After that, the cold water passes through the Y-type filter 11, the stop valve 3 and the rubber flexible joint 9 respectively, and finally returns to the inlet of the cold water circulation pump 24. An expansion water tank 22 is provided in the cold water circulation module, which is used to bear the volume change of the cold water in the circulation pipeline caused by the rapid change of temperature.

[0022] The cooling circulation module is driven by a cooling water circulation pump 20, which is a variable frequency water pump. A pressure gauge 8 is provided at its outlet to monitor the operating status of the cooling water circulation pump. A drain ball valve 7 is provided at the outlet of the cooling water circulation pump 20 to discharge the water accumulated in the circulation pipeline after shutdown to prevent the pipeline from being corroded. The outlet of the cooling water circulation pump 20 is connected in sequence with a rubber flexible joint 9, a stop valve 3, a one-way valve 5, a stop valve 3, a rubber hose 17 and an electric three-way regulating valve 16. The electric three-way regulating valve 16 in the cooling circulation module is also a diversion type three-way valve, which divides the cooling water into two paths, one path passes through the stop valve 3 and the heat exchanger 15, and the other path directly merges with the first path at the outlet of the heat exchanger 15. A temperature sensor 13 is provided at the inlet of the heat exchanger 15, which is used to monitor the water temperature entering the heat exchanger, ensure the stability of the cooling water temperature, and facilitate the heat exchange by adjusting the cooling water flow under the control variable condition. The collected cooling water then passes through the rubber hose 17, the stop valve 3 and the cooling tower 18, and after cooling, it is collected in the constant temperature water tank 19. The constant temperature water tank 19 provides stable constant temperature cooling water, and the water flows through the stop valve 3, the Y-type filter 11 and the rubber flexible joint 9 respectively, and finally returns to the inlet of the cooling water circulation pump 20.

[0023] During the operation of the test bench, each circulation module operates independently, and heat transfer and balance are achieved between modules through heat exchangers. Each module measures data through pressure and temperature sensors, and adjusts components such as the circulating water pump and electric three-way valve based on the measured data to achieve test tests under various working conditions.

Claims

1. A pressurized ultra-high temperature heat pump test bench, Features: The invention comprises a hot water circulation module, a water replenishment boosting and pressure stabilizing module, a cold water circulation module and a cooling circulation module, and each circulation module operates independently; a cold-heat balance heat exchanger (23) is used between the hot water circulation module and the cold water circulation module to compensate for the heat loss in the cold water circulation module; a heat dissipation heat exchanger (15) is used between the hot water circulation module and the cooling circulation module to balance the heat gain in the hot water circulation module; the water replenishment boosting and pressure stabilizing module is connected to the hot water circulation module to increase the pressure of the hot water circulation module; the hot water circulation module is driven by a hot water circulation pump (10), and the outlet of the hot water circulation pump (10) is connected to the test unit condenser (1); the outlet of the test unit condenser (1) is connected to an electric three-way regulating valve (16); The electric three-way regulating valve (16) is a diversion type three-way valve, one branch of which is connected to the electric heater (25) and the stop valve (3), and the other branch is connected to the cold and hot balance heat exchanger (23) and the stop valve (3). After the two branches are merged, they are connected to the inlet of the hot water circulation pump (10) through the heat dissipation heat exchanger (15); the water replenishment boosting and pressure stabilizing module comprises two parts: water replenishment and pressure stabilizing. The water replenishment part comprises a Y-type filter (11), a water replenishment boosting pump (14), and a one-way valve (5) connected in series; the pressure stabilizing part comprises a pressure stabilizing diaphragm expansion tank (6) and a stop valve (3) connected in series. The water replenishment part and the pressure stabilizing part are connected to the hot water circulation module.

2. According to the pressurized ultra-high temperature heat pump test bench of claim 1, Features: The cold water circulation module is driven by a cold water circulation pump (24), and its outlet is sequentially connected to a rubber flexible joint (9), a one-way valve (5), an electromagnetic flowmeter (4), and a metal hose (2), and then connected to the test unit evaporator (27); The outlet of the test unit evaporator (27) is connected to the cold and hot balance heat exchanger (23) through a metal hose (2) and a stop valve (3); a Y-type filter (11), a stop valve (3) and a rubber flexible joint (9) are connected between the outlet of the cold and hot balance heat exchanger (23) and the inlet of the cold water circulation pump (24).

3. According to the pressurized ultra-high temperature heat pump test bench of claim 1, Features: The cooling circulation module is driven by a cooling water circulation pump (20), and its outlet is sequentially connected to a rubber flexible joint (9), a stop valve (3), a one-way valve (5), a stop valve (3), a rubber hose (17) and an electric three-way regulating valve (16); The electric three-way regulating valve (16) in the cooling circulation module is a diversion type three-way valve, wherein the first branch is connected to the stop valve (3) and the heat dissipation heat exchanger (15), and the second branch is directly connected to the first branch at the outlet of the heat dissipation heat exchanger (15), and after being connected, the second branch is connected to the inlet of the cooling water circulation pump (20) via a rubber hose (17), a stop valve (3), a cooling tower (18), and a constant temperature water tank (19).

4. The pressurized ultra-high temperature heat pump test bench according to any one of claims 1 to 3, Features: An exhaust valve (21) is provided at the relative highest point of the hot water circulation module, the cold water circulation module and the cooling circulation module.

5. According to claim 1, the pressurized ultra-high temperature heat pump test bench, Features: A pressure sensor (12) and a temperature sensor (13) are provided at the inlet and outlet pipes of the test unit condenser (1).

6. According to claim 1, the pressurized ultra-high temperature heat pump test bench, Features: A safety valve (26) is provided at the outlet connection between the hot water circulation module and the test unit condenser (1).

7. According to claim 2, the pressurized ultra-high temperature heat pump test bench, Features: A pressure sensor (12) and a temperature sensor (13) are provided at the inlet and outlet pipes of the test unit evaporator (27).

8. The pressurized ultra-high temperature heat pump test bench according to claim 1, Features: An expansion water tank (22) is provided in the cold water circulation module.

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