Intelligent compression high-temperature heat pump hot water system with large temperature difference

Abstract

This utility model discloses an intelligent compression high-temperature heat pump water heating system with large temperature difference, including a first transcritical carbon dioxide compressor, a second transcritical carbon dioxide compressor, an R515B compressor, a gas cooler, a regenerator, a constant pressure valve, an R744 liquid receiver, an R744 electronic expansion valve, a dual-system air heat exchanger, an electric three-way valve, a condenser, check valves, check valve a, check valve b, check valve c, check valve d, check valve e, electronic expansion valve a, electronic expansion valve b, R515B liquid receiver, and a four-way reversing valve. Using R744 and R515B as the heat pump working fluids, it meets low-carbon and environmentally friendly requirements. The system automatically adjusts its operation by monitoring ambient temperature and return water temperature to ensure optimal system operation. The system can achieve a maximum heat exchange temperature difference of 25℃. The parallel compression system addresses the impact of high return water temperature on the heating efficiency of the transcritical carbon dioxide cycle.

Description

Technical Field

[0001] This utility model relates to an intelligent compression high-temperature heat pump water heating system with large temperature difference, belonging to the technical field of the HVAC industry. Background Technology

[0002] As people's living standards continue to improve and new technologies develop, their demands for comfort in life and housing are increasing. In the Yellow River and Yangtze River basins, centralized heating is not available in winter, and the high humidity makes the perceived temperature even lower, resulting in an uncomfortable living environment. Providing a heating source can improve people's comfort. However, for some special buildings, such as airports and other large spaces, the heating terminals are more complex, requiring strict control over the water temperature and temperature difference of the water system. Traditional heat pumps cannot meet these needs. Utility Model Content

[0003] The purpose of this invention is to provide an intelligent compression high-temperature heat pump water heating system with large temperature difference to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: an intelligent compression high-temperature heat pump hot water system with large temperature difference, characterized in that it includes a first transcritical carbon dioxide compressor, a second transcritical carbon dioxide compressor, an R515B compressor, a gas cooler, a regenerator, a constant pressure valve, an R744 liquid receiver, an R744 electronic expansion valve, a dual-system air heat exchanger, an electric three-way valve, a condenser, check valves, check valve a, check valve b, check valve c, check valve d, check valve e, electronic expansion valve a, and electronic expansion valve b. The R515B receiver, four-way reversing valve, and dual-system air heat exchanger inlet and outlet ports are respectively connected to R744 electronic expansion valve, electronic expansion valve a, and check valve e. The R744 electronic expansion valve is independently connected to and installed with a first transcritical carbon dioxide compressor, a second transcritical carbon dioxide compressor, and an electric three-way valve. The regenerator and R744 receiver are sequentially connected by pipelines. Check valves a, b, c, and d are connected to the R515B receiver in series and parallel via pipelines. The gas cooler is sequentially connected to and installed with a condenser, electronic expansion valve b, and four-way reversing valve via pipelines. The four-way reversing valve is independently connected to the R515B compressor.

[0005] Preferably, when the ambient temperature is higher than 0°C, all compressors in the system are running. The R744 working fluid passes through the first transcritical carbon dioxide compressor and the second transcritical carbon dioxide compressor and then enters the gas cooler to exchange heat with water. When the return water temperature is higher than 40°C, the second transcritical carbon dioxide compressor draws gaseous R744 working fluid from the regenerator through an electric three-way valve. When the return water temperature is lower than 40°C, the second transcritical carbon dioxide compressor draws gaseous R744 working fluid from the dual-system air heat exchanger through an electric three-way valve. After being cooled by the gas cooler (4), the R744 enters the regenerator and enters the R744 liquid reservoir through a constant pressure valve. It then enters the dual-system air heat exchanger through the R744 electronic expansion valve to exchange heat with the outdoor air heat exchanger. After becoming gaseous, it returns to the compressor suction end to complete the cycle.

[0006] Preferably, when the ambient temperature is higher than 0°C, all compressors in the system are running. In the water supply circuit: the R515B compressor runs and enters the condenser through the four-way reversing valve to exchange heat with water. After heat exchange, it enters the R515B receiver through the one-way valve d, and then enters the electronic expansion valve a through the one-way valve a, and enters the dual-system air heat exchanger to exchange heat with the outdoor air heat exchanger. After becoming gaseous, it returns to the suction end of the R515B compressor to complete the cycle.

[0007] Preferably, when the ambient temperature is below 0°C, only the carbon dioxide compressor operates in the system. The R744 working fluid passes through the first transcritical carbon dioxide compressor and the second transcritical carbon dioxide compressor and then enters the gas cooler to exchange heat with the water. When the return water temperature is above 40°C, the second transcritical carbon dioxide compressor draws gaseous R744 working fluid from the regenerator through an electric three-way valve. When the return water temperature is below 40°C, the second transcritical carbon dioxide compressor draws gaseous R744 working fluid from the dual-system air heat exchanger through an electric three-way valve. After being cooled by the gas cooler (4), the R744 enters the regenerator and enters the R744 storage tank through a constant pressure valve. It then enters the dual-system air heat exchanger through the R744 electronic expansion valve to exchange heat with the outdoor air heat exchanger. After becoming gaseous, it returns to the compressor suction end to complete the cycle.

[0008] Preferably, the summer cooling and defrosting operation states are consistent. The R515B compressor operates by entering the dual-system air heat exchanger through the four-way reversing valve to exchange heat with the outdoor air heat exchanger, then entering the R515B liquid receiver through one-way valves e and b, and then entering the condenser through one-way valve c and electronic expansion valve b to exchange heat with water. After becoming gaseous, it returns to the suction end of the R515B compressor, completing the cycle.

[0009] Compared with the prior art, the beneficial effects of this utility model are: using R744 and R515B as the working fluid of the heat pump can meet the normal requirements of low carbon and environmental protection; the system can achieve a maximum supply water temperature of 85℃; the system can automatically adjust the system operation status by monitoring the ambient temperature and return water temperature to ensure that the system operates in the optimal state; the system can achieve a maximum heat exchange temperature difference of 25℃; and the parallel compression system solves the impact of high return water temperature on the heating efficiency of transcritical carbon dioxide cycle. Attached Figure Description

[0010] Figure 1 This is a system schematic diagram of the intelligent compression high temperature difference heat pump water heating system of this utility model; Figure 2 This is a schematic diagram of a partial installation structure of the return water pipeline of this utility model; Figure 3 This is a schematic diagram of a partial installation structure of the water supply pipeline of this utility model; Figure 4 This is a schematic diagram of the inlet and outlet water circuits of the intelligent compression high-temperature heat pump water heating system of this utility model.

[0011] In the diagram: 1. First transcritical CO2 compressor; 2. Second transcritical CO2 compressor; 3. R515B compressor; 4. Gas cooler; 5. Regenerator; 6. Constant pressure valve; 7. R744 receiver; 8. R744 electronic expansion valve; 9. Dual-system air heat exchanger; 10. Electric three-way valve; 11. Condenser; 12. Check valve; 12a. Check valve a; 12b. Check valve b; 12c. Check valve c; 12d. Check valve d; 12e. Check valve e; 13a. Electronic expansion valve a; 13b. Expansion valve b; 14. R515B receiver; 15. Four-way directional valve. Detailed Implementation

[0012] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0013] like Figures 1-3As shown, a smart compression high-temperature heat pump water heating system with large temperature difference includes a first transcritical carbon dioxide compressor 1, a second transcritical carbon dioxide compressor 2, an R515B compressor 3, a gas cooler 4, a regenerator 5, a constant pressure valve 6, an R744 liquid receiver 7, an R744 electronic expansion valve 8, a dual-system air heat exchanger 9, an electric three-way valve 10, a condenser 11, a one-way valve 12, one-way valves a12a, b12b, c12c, d12d, and e12e, an electronic expansion valve a13a, an electronic expansion valve b13b, an R515B liquid receiver 14, and a four-way reversing valve 15. The inlet and outlet ports of the dual-system air heat exchanger 9 are respectively connected to the R744 electronic expansion valve 8, electronic expansion valve a13a, and one-way valve e12e. The sub-expansion valve 8 is connected to the first transcritical carbon dioxide compressor 1, the second transcritical carbon dioxide compressor 2, and the electric three-way valve 10 via independent pipelines. The regenerator 5 and the R744 liquid receiver 7 are connected sequentially via pipelines. Check valves a12a, b12b, c12c, and d12d are connected to the R515B liquid receiver 14 via pipelines in series and parallel. The gas cooler 4 is connected to the condenser 11, the electronic expansion valve b13b, and the four-way reversing valve 15 via pipelines. The four-way reversing valve 15 is connected to the R515B compressor 3 via an independent pipeline.

[0014] When the ambient temperature is above 0°C, all compressors in the system are running. In the return water circuit: after passing through the first transcritical carbon dioxide compressor 1 and the second transcritical carbon dioxide compressor 2, the R744 working fluid enters the gas cooler 4 to exchange heat with the water. When the return water temperature is above 40°C, the second transcritical carbon dioxide compressor 2 draws gaseous R744 working fluid from the regenerator 5 through the electric three-way valve 10. When the return water temperature is below 40°C, the second transcritical carbon dioxide compressor 2 draws gaseous R744 working fluid from the dual-system air heat exchanger 9 through the electric three-way valve 10. After being cooled by the gas cooler (4), the R744 enters the regenerator 5 and enters the R744 liquid reservoir 7 through the constant pressure valve 6. It then enters the dual-system air heat exchanger 9 through the R744 electronic expansion valve 8 to exchange heat with the outdoor air heat exchanger. After becoming gaseous, it returns to the compressor suction end to complete the cycle.

[0015] When the ambient temperature is above 0℃, all compressors in the system are running. In the water supply circuit: the R515B compressor 3 runs through the four-way reversing valve 15 and enters the condenser 11 to exchange heat with water. After heat exchange, it enters the R515B receiver 14 through the one-way valve d12d, and then enters the electronic expansion valve a13a through the one-way valve a12a and enters the dual-system air heat exchanger 9 to exchange heat with the outdoor air heat exchanger. After turning into gas, it returns to the suction end of the R515B compressor 3 to complete the cycle.

[0016] When the ambient temperature is below 0°C, only the carbon dioxide compressor operates in the system. The R744 working fluid passes through the first transcritical carbon dioxide compressor 1 and the second transcritical carbon dioxide compressor 2, and then enters the gas cooler 4 to exchange heat with the water. When the return water temperature is above 40°C, the second transcritical carbon dioxide compressor 2 draws gaseous R744 working fluid from the regenerator 5 through the electric three-way valve 10. When the return water temperature is below 40°C, the second transcritical carbon dioxide compressor 2 draws gaseous R744 working fluid from the dual-system air heat exchanger 9 through the electric three-way valve 10. After being cooled by the gas cooler (4), the R744 enters the regenerator 5 and enters the R744 liquid reservoir 7 through the constant pressure valve 6. It then enters the dual-system air heat exchanger 9 through the R744 electronic expansion valve 8 to exchange heat with the outdoor air heat exchanger. After becoming gaseous, it returns to the compressor suction end to complete the cycle.

[0017] The summer cooling and defrosting operation states are consistent. The R515B compressor 3 enters the dual-system air heat exchanger 9 through the four-way reversing valve 15 to exchange heat with the outdoor air heat exchanger. It then enters the R515B liquid receiver 14 through the one-way valves e12e and b12b, and then enters the electronic expansion valve b13b through the one-way valve c12c to exchange heat with water in the condenser 11. After turning into a gaseous state, it returns to the suction end of the R515B compressor 3 to complete the cycle.

[0018] Specific application: A smart compression high-temperature heat pump hot water system with large temperature difference uses a low R744 working fluid to meet the normal requirements of low carbon and environmental protection; the system can achieve a maximum supply water temperature of 85℃; the system can automatically adjust its operating status by monitoring the ambient temperature and return water temperature to ensure that the system operates in the optimal state; the system can achieve a maximum heat exchange temperature difference of 25℃; and the parallel compression system solves the impact of high return water temperature on the heating efficiency of transcritical carbon dioxide cycle.

[0019] The above description is a preferred embodiment of the present utility model. For those skilled in the art, any changes, modifications, substitutions and variations made to the implementation methods without departing from the principles and spirit of the present utility model, based on the teachings of the present utility model, still fall within the protection scope of the present utility model.

Claims

1. An intelligent compression large-temperature-difference high-temperature heat pump hot water system, characterized in that, Includes a first transcritical carbon dioxide compressor (1), a second transcritical carbon dioxide compressor (2), an R515B compressor (3), a gas cooler (4), a regenerator (5), a constant pressure valve (6), an R744 liquid receiver (7), an R744 electronic expansion valve (8), a dual-system air heat exchanger (9), an electric three-way valve (10), a condenser (11), a check valve (12), check valve a (12a), check valve b (12b), check valve c (12c), check valve d (12d), check valve e (12e), electronic expansion valve a (13a), and electronic expansion valve b (13b). The R515B receiver (14), four-way reversing valve (15), and dual-system air heat exchanger (9) are connected to the R744 electronic expansion valve (8), electronic expansion valve a (13a), and one-way valve e (12e) at their inlet and outlet ports, respectively. The R744 electronic expansion valve (8) is connected to the first transcritical carbon dioxide compressor (1), the second transcritical carbon dioxide compressor (2), and an electric three-way valve (10) via independent pipelines. The regenerator (5) and the R744 receiver (7) are connected in sequence through pipelines. Check valves a (12a), b (12b), c (12c), and d (12d) are connected in series and parallel to the R515B receiver (14) through pipelines. The gas cooler (4) is connected in sequence through pipelines to the condenser (11), electronic expansion valve b (13b), and four-way reversing valve (15). The four-way reversing valve (15) is connected to the R515B compressor (3) through an independent pipeline.

2. The intelligent compression high-temperature heat pump hot water system with large temperature difference according to claim 1, characterized in that: When the ambient temperature is above 0℃, all compressors in the system are running. In the return water circuit: after passing through the first transcritical carbon dioxide compressor (1) and the second transcritical carbon dioxide compressor (2), the R744 working fluid enters the gas cooler (4) to exchange heat with the water. When the return water temperature is above 40℃, the second transcritical carbon dioxide compressor (2) draws gaseous R744 working fluid from the regenerator (5) through the electric three-way valve (10). When the return water temperature is below 40℃, the second transcritical carbon dioxide compressor (2) draws gaseous R744 working fluid from the dual-system air heat exchanger (9) through the electric three-way valve (10). After being cooled by the gas cooler (4), the R744 enters the regenerator (5) and enters the R744 liquid reservoir (7) through the constant pressure valve (6). It then enters the dual-system air heat exchanger (9) through the R744 electronic expansion valve (8) to exchange heat with the outdoor air heat exchanger. After becoming gaseous, it returns to the compressor suction end to complete the cycle.

3. The intelligent compression high-temperature heat pump hot water system with large temperature difference according to claim 1, characterized in that: When the ambient temperature is above 0℃, all compressors in the system are running. The R515B compressor (3) enters the condenser (11) through the four-way reversing valve (15) to exchange heat with water. After heat exchange, it enters the R515B liquid receiver (14) through the one-way valve d (12d), and then enters the electronic expansion valve a (13a) through the one-way valve a (12a) to exchange heat with the outdoor air heat exchanger in the dual system air heat exchanger. After becoming gaseous, it returns to the suction end of the R515B compressor (3) to complete the cycle.

4. The intelligent compression high-temperature heat pump hot water system with large temperature difference according to claim 1, characterized in that: When the ambient temperature is below 0℃, only the carbon dioxide compressor operates in the system. After passing through the first transcritical carbon dioxide compressor (1) and the second transcritical carbon dioxide compressor (2), the R744 working fluid enters the gas cooler (4) to exchange heat with water. When the return water temperature is above 40℃, the second transcritical carbon dioxide compressor (2) draws gaseous R744 working fluid from the regenerator (5) through the electric three-way valve (10). When the return water temperature is below 40℃, the second transcritical carbon dioxide compressor (2) draws gaseous R744 working fluid from the dual-system air heat exchanger (9) through the electric three-way valve (10). After being cooled by the gas cooler (4), the R744 enters the regenerator (5) and enters the R744 liquid reservoir (7) through the constant pressure valve (6). It then enters the dual-system air heat exchanger (9) through the R744 electronic expansion valve (8) to exchange heat with the outdoor air heat exchanger. After becoming gaseous, it returns to the compressor suction end to complete the cycle.

5. The intelligent compression high-temperature heat pump hot water system with large temperature difference according to claim 1, characterized in that: In summer, the operation of the cooling and defrosting modes is consistent. The R515B compressor (3) enters the dual-system air heat exchanger (9) through the four-way reversing valve (15) to exchange heat with the outdoor air heat exchanger. It then enters the R515B liquid receiver (14) through the one-way valve e (12e) and one-way valve b (12b). Finally, it enters the electronic expansion valve b (13b) through the one-way valve c (12c) to exchange heat with water in the condenser (11). After turning into a gaseous state, it returns to the suction end of the R515B compressor (3) to complete the cycle.

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