Integrated heat pump unit system with high-temperature hot water and low-temperature cold water preparation functions

Abstract

The invention discloses an integrated heat pump unit system with a high-temperature hot water and low-temperature cold water preparation function, which comprises a low-temperature side circulation module, a middle heat exchange module and a high-temperature side circulation module, and is characterized in that the low-temperature side circulation module is connected with the high-temperature side circulation module through the middle heat exchange module; the low-temperature side circulation module comprises a frequency conversion compressor, a three-way valve, a low-temperature evaporator, a gas-liquid separator, a filter, a first throttling valve, a first electromagnetic valve, a second electromagnetic valve, a first one-way valve and a second one-way valve. The intermediate heat exchange module comprises an intermediate condenser, an intermediate water tank, an electric heater and a high-temperature evaporator; the high-temperature side circulation module comprises a fixed-frequency compressor, a high-temperature condenser and a second throttling valve. During cooperative operation, condensation heat at the refrigeration end is recycled for heating, gradient utilization of energy is achieved, compared with two traditional systems, the energy-saving effect can be achieved, meanwhile, heat of the condensation heat is preferentially utilized and recycled by the high-temperature side, electric heating is started only when necessary, and high-grade energy consumption is reduced.

Description

Technical Field

[0001] This invention relates to the field of heating, ventilation, air conditioning and refrigeration technology, and in particular to an integrated heat pump unit system that combines the functions of producing high-temperature hot water and low-temperature cold water. Background Technology

[0002] In many settings such as hotels, hospitals, factory processes, and regional energy stations, there is often a simultaneous demand for both high-temperature hot water (e.g., domestic hot water, process heating, and heating water supply) and low-temperature chilled water (e.g., air conditioning cooling and process cooling). Currently, the conventional solution is to set up separate boiler (or air source heat pump) systems to produce hot water and chiller units (e.g., air-cooled or water-cooled screw chillers or centrifugal chillers) systems to produce chilled water.

[0003] The existing model, which uses two systems to operate independently, cannot achieve energy cascade utilization. Under cooling conditions, a large amount of condensation heat emitted by the chiller unit is directly lost, while the hot water system needs to consume additional energy for heating, resulting in energy waste. Therefore, it is necessary to design an integrated heat pump unit system that can produce both high-temperature hot water and low-temperature chilled water. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and propose an integrated heat pump unit system that can simultaneously produce high-temperature hot water and low-temperature cold water.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an integrated heat pump unit system with both high-temperature hot water and low-temperature cold water preparation functions, comprising a low-temperature side circulation module, an intermediate heat exchange module, and a high-temperature side circulation module. The low-temperature side circulation module is connected to the high-temperature side circulation module through the intermediate heat exchange module. The low-temperature side circulation module includes a variable frequency compressor, a three-way valve, a low-temperature evaporator, a gas-liquid separator, a filter, a first throttle valve, a first solenoid valve, a second solenoid valve, a first check valve, and a second check valve. The intermediate heat exchange module includes an intermediate condenser, an intermediate water tank, an electric heater, and a high-temperature evaporator. The high-temperature side circulation module includes a fixed-frequency compressor, a high-temperature condenser, and a second throttle valve.

[0006] As a further description of the above technical solution:

[0007] The discharge port of the variable frequency compressor is connected to a three-way valve via a pipe. The two outlets of the three-way valve are respectively connected to the refrigerant inlet of the intermediate condenser and the inlet of the finned heat exchanger via pipes. The refrigerant outlet of the intermediate condenser is connected to a first solenoid valve via a pipe, and the outlet of the finned heat exchanger is connected to a second solenoid valve via a pipe. The outlet of the first solenoid valve is connected to a first check valve via a pipe, and the outlet of the second solenoid valve is connected to a second check valve via a pipe. The outlets of the first and second check valves are connected to a filter via a pipe. The outlet of the filter is connected to a first throttle valve via a pipe. The outlet of the first throttle valve is connected to the inlet of the low-temperature evaporator via a pipe. The outlet of the low-temperature evaporator is connected to a gas-liquid separator via a pipe. The outlet of the gas-liquid separator is connected to the suction port of the variable frequency compressor via a pipe.

[0008] As a further description of the above technical solution:

[0009] The water-side inlet and outlet of the low-temperature evaporator are connected to the cold water tank via pipes.

[0010] As a further description of the above technical solution:

[0011] The water-side outlet of the intermediate condenser is connected to the intermediate water tank via a pipe. The outlet of the intermediate water tank is connected to the electric heater via a pipe. The outlet of the electric heater is connected to the water-side inlet of the high-temperature evaporator via a pipe. The water-side outlet of the high-temperature evaporator is connected to the water-side inlet of the intermediate condenser via a pipe.

[0012] As a further description of the above technical solution:

[0013] The refrigerant inlet of the high-temperature evaporator is connected to the second throttle valve via a pipe, the second throttle valve is connected to the refrigerant outlet of the high-temperature condenser via a pipe, the refrigerant inlet of the high-temperature condenser is connected to the exhaust port of the fixed-frequency compressor via a pipe, and the suction port of the fixed-frequency compressor is connected to the refrigerant outlet of the high-temperature evaporator via a pipe.

[0014] As a further description of the above technical solution:

[0015] The water-side inlet and outlet of the high-temperature condenser are connected to the high-temperature water tank via pipes.

[0016] The present invention has the following beneficial effects:

[0017] Compared with existing technologies, this invention recovers the condensation heat of the cooling end for heating during collaborative operation, realizing the cascade utilization of energy. Compared with the traditional two-system approach, it can achieve energy saving. At the same time, the heat of condensation is preferentially utilized and recovered on the high-temperature side, and electric heating is only activated when necessary, reducing the consumption of high-grade energy. In addition, the cold and heat preparation functions are integrated into one unit, eliminating the need for two separate systems, reducing initial equipment investment and floor space, and lowering installation and maintenance costs. Attached Figure Description

[0018] Figure 1 This is a flowchart of an integrated heat pump unit system that combines the functions of producing high-temperature hot water and low-temperature cold water, as proposed in this invention.

[0019] Legend:

[0020] 1. Variable frequency compressor; 2. Three-way valve; 3. Intermediate condenser; 4. First solenoid valve; 5. First check valve; 6. Filter; 7. First throttle valve; 8. Low-temperature evaporator; 9. Gas-liquid separator; 10. Intermediate water tank; 11. Electric heater; 12. High-temperature evaporator; 13. Fixed frequency compressor; 14. High-temperature condenser; 15. Second throttle valve; 16. Finned heat exchanger; 17. Second solenoid valve; 18. Second check valve; 19. High-temperature water tank; 20. Cold water tank. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Reference Figure 1 This invention provides an integrated heat pump unit system that combines high-temperature hot water and low-temperature cold water preparation functions. It includes a low-temperature side circulation module, an intermediate heat exchange module, and a high-temperature side circulation module. The low-temperature side circulation module is connected to the high-temperature side circulation module via the intermediate heat exchange module. The low-temperature side circulation module includes a variable frequency compressor 1, a three-way valve 2, a low-temperature evaporator 8, a gas-liquid separator 9, a filter 6, a first throttle valve 7, a first solenoid valve 4, a second solenoid valve 17, a first one-way valve 5, and a second one-way valve 18. The intermediate heat exchange module includes an intermediate condenser 3, an intermediate water tank 10, an electric heater 11, and a high-temperature evaporator 12. The high-temperature side circulation module includes a fixed-frequency compressor 13, a high-temperature condenser 14, and a second throttle valve 15.

[0023] In operation, after the system starts, the variable frequency compressor 1 begins to work, compressing the low-temperature, low-pressure refrigerant gas into a high-temperature, high-pressure gas, which is then discharged from the exhaust port. The high-temperature, high-pressure refrigerant gas enters the three-way valve 2 through a pipeline. The three-way valve 2 distributes the refrigerant gas to the intermediate condenser 3 or the finned heat exchanger 16 according to system requirements. If the system needs to produce high-temperature hot water, the three-way valve 2 directs most of the refrigerant gas to the intermediate condenser 3. In the intermediate condenser 3, the refrigerant gas releases heat, heating the water to a high temperature, while simultaneously condensing itself into a liquid. The condensed refrigerant liquid passes through the first solenoid valve 4 and the first one-way valve 5, and then through the throttling and pressure reduction effects of the filter 6 and the first throttling valve 7, becoming a low-temperature, low-pressure liquid, which then enters the low-temperature evaporator 8. In the low-temperature evaporator 8, the refrigerant liquid absorbs heat from the water in the cold water tank 20 and evaporates, becoming a low-temperature, low-pressure gas. After passing through the gas-liquid separator 9 to remove any possible droplets, it returns to the suction port of the variable frequency compressor 1, completing the low-temperature side circulation.

[0024] If the system needs to produce low-temperature chilled water, the three-way valve 2 directs a portion of the refrigerant gas to the finned heat exchanger 16. In the finned heat exchanger 16, the refrigerant gas exchanges heat with the outside air, releasing heat and condensing into a liquid. The condensed refrigerant liquid then passes through the second solenoid valve 17 and the second one-way valve 18, and after passing through the filter 6 and the first throttling valve 7 for pressure reduction, enters the low-temperature evaporator 8 to undergo the same evaporation process as described above, thereby producing low-temperature chilled water.

[0025] In the intermediate heat exchange module, high-temperature water from the water-side outlet of the intermediate condenser 3 flows into the intermediate water tank 10. The water in the intermediate water tank 10 is further heated by the electric heater 11 (when the heat released by the intermediate condenser 3 is insufficient to heat the water to the required high temperature), and then enters the high-temperature evaporator 12. In the high-temperature evaporator 12, the water absorbs the heat released by the refrigerant and is heated to a higher temperature, while the refrigerant itself condenses into a liquid. The high-temperature water from the water-side outlet of the high-temperature evaporator 12 flows back to the water-side inlet of the intermediate condenser 3, forming a cycle to ensure a continuous supply of high-temperature hot water.

[0026] In the high-temperature side circulation module, the fixed-frequency compressor 13 compresses the high-temperature, low-pressure refrigerant gas into a high-temperature, high-pressure gas and discharges it into the high-temperature condenser 14. In the high-temperature condenser 14, the refrigerant gas releases heat, heating the water in the high-temperature water tank 19 to a higher temperature, while simultaneously condensing itself into a liquid. The condensed refrigerant liquid is then throttled and depressurized by the second throttling valve 15, becoming a low-temperature, low-pressure liquid, and then enters the high-temperature evaporator 12 to undergo the same evaporation and condensation process as described above, thereby maintaining the stable operation of the high-temperature side circulation.

[0027] The discharge port of the variable frequency compressor 1 is connected to a three-way valve 2 via a pipe. The two outlets of the three-way valve 2 are respectively connected to the refrigerant inlet of the intermediate condenser 3 and the inlet of the finned heat exchanger 16 via pipes. The refrigerant outlet of the intermediate condenser 3 is connected to a first solenoid valve 4 via a pipe, and the outlet of the finned heat exchanger 16 is connected to a second solenoid valve 17 via a pipe. The outlet of the first solenoid valve 4 is connected to a first check valve 5 via a pipe, and the outlet of the second solenoid valve 17 is connected to a second check valve 18 via a pipe. The outlets of the first check valve 5 and the second check valve 18 are connected to a filter 6 via a pipe. The outlet of the filter 6 is connected to a first throttle valve 7 via a pipe. The outlet of the first throttle valve 7 is connected to the inlet of the low-temperature evaporator 8 via a pipe. The outlet of the low-temperature evaporator 8 is connected to a gas-liquid separator 9 via a pipe. The outlet of the gas-liquid separator 9 is connected to the suction port of the variable frequency compressor 1 via a pipe. The water side inlet and outlet of the low-temperature evaporator 8 are connected to the cold water tank 20 via pipes.

[0028] The water-side outlet of the intermediate condenser 3 is connected to the intermediate water tank 10 via a pipe. The outlet of the intermediate water tank 10 is connected to the electric heater 11 via a pipe. The outlet of the electric heater 11 is connected to the water-side inlet of the high-temperature evaporator 12 via a pipe. The water-side outlet of the high-temperature evaporator 12 is connected to the water-side inlet of the intermediate condenser 3 via a pipe.

[0029] The refrigerant inlet of the high-temperature evaporator 12 is connected to the second throttle valve 15 via a pipe. The second throttle valve 15 is connected to the refrigerant outlet of the high-temperature condenser 14 via a pipe. The refrigerant inlet of the high-temperature condenser 14 is connected to the discharge port of the fixed-frequency compressor 13 via a pipe. The suction port of the fixed-frequency compressor 13 is connected to the refrigerant outlet of the high-temperature evaporator 12 via a pipe. The water-side inlet and outlet of the high-temperature condenser 14 are connected to the high-temperature water tank 19 via pipes.

[0030] Working principle:

[0031] Synergistic cooling and heating mode: The control module receives a signal that simultaneously generates cooling and heating, controls the three-way valve 2 to switch to the intermediate condenser 3 passage, the first solenoid valve 4 opens and the second solenoid valve 17 closes; the variable frequency compressor 1 is started, the low-temperature side circulates, and the low-temperature evaporator 8 outputs low-temperature chilled water; the water temperature of the intermediate water tank 10 is maintained by condensation heat, and the electric heater 11 is turned off; the fixed frequency compressor 13 is started, the high-temperature side circulates, and the high-temperature condenser 14 outputs high-temperature hot water.

[0032] Independent cooling mode: The control module receives only the cooling signal, controls the fixed frequency compressor 13 to stop, the three-way valve 2 switches to the finned heat exchanger 16 passage, the second solenoid valve 17 opens and the first solenoid valve 4 closes; the variable frequency compressor 1 starts, the low temperature side circulates, the finned heat exchanger 16 dissipates heat, and the low temperature evaporator 8 outputs low temperature chilled water.

[0033] High-efficiency heating mode: The control module receives a heating-only signal, controls the variable frequency compressor 1 to stop, and closes the first solenoid valve 4 and the second solenoid valve 17; starts the electric heater 11 to heat the water in the intermediate water tank 10 to the set value; starts the fixed frequency compressor 13, and the high-temperature side circulates, and the high-temperature condenser 14 outputs high-temperature hot water.

[0034] Heating mode: When the control module detects that the refrigeration is running at partial load and the water temperature of the intermediate water tank 10 is lower than the set value, it controls the three-way valve 2 to switch to the intermediate condenser 3 passage and the first solenoid valve 4 to open; the variable frequency compressor 1 is started to run at partial load, and the electric heater 11 is started in stages to supplement heat and maintain the water temperature of the intermediate water tank 10; the fixed frequency compressor 13 is started, and the high temperature side circulates and outputs high temperature hot water normally.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An integrated heat pump unit system that combines high-temperature hot water and low-temperature cold water preparation functions, characterized in that: It includes a low-temperature side circulation module, an intermediate heat exchange module, and a high-temperature side circulation module. The low-temperature side circulation module is connected to the high-temperature side circulation module through the intermediate heat exchange module. The low-temperature side circulation module includes a variable frequency compressor (1), a three-way valve (2), a low-temperature evaporator (8), a gas-liquid separator (9), a filter (6), a first throttle valve (7), a first solenoid valve (4), a second solenoid valve (17), a first check valve (5), and a second check valve (18). The intermediate heat exchange module includes an intermediate condenser (3), an intermediate water tank (10), an electric heater (11), and a high-temperature evaporator (12). The high-temperature side circulation module includes a fixed frequency compressor (13), a high-temperature condenser (14), and a second throttle valve (15).

2. The integrated heat pump unit system with both high-temperature hot water and low-temperature cold water preparation functions according to claim 1, characterized in that: The discharge port of the variable frequency compressor (1) is connected to a three-way valve (2) via a pipe. The two outlets of the three-way valve (2) are respectively connected to the refrigerant inlet of the intermediate condenser (3) and the inlet of the finned heat exchanger (16) via pipes. The refrigerant outlet of the intermediate condenser (3) is connected to a first solenoid valve (4) via a pipe, and the outlet of the finned heat exchanger (16) is connected to a second solenoid valve (17) via a pipe. The outlet of the first solenoid valve (4) is connected to a first check valve (5) via a pipe, and the outlet of the second solenoid valve (17) is connected to the first check valve (5). The outlet of the first check valve (5) is connected to a second check valve (18) via a pipe. The outlets of the first check valve (5) and the second check valve (18) are connected to a filter (6) via a pipe. The outlet of the filter (6) is connected to a first throttle valve (7) via a pipe. The outlet of the first throttle valve (7) is connected to the inlet of the low-temperature evaporator (8) via a pipe. The outlet of the low-temperature evaporator (8) is connected to a gas-liquid separator (9) via a pipe. The outlet of the gas-liquid separator (9) is connected to the suction port of the variable frequency compressor (1) via a pipe.

3. The integrated heat pump unit system with both high-temperature hot water and low-temperature cold water preparation functions according to claim 2, characterized in that: The water-side inlet and outlet of the low-temperature evaporator (8) are connected to the cold water tank (20) via pipes.

4. The integrated heat pump unit system with both high-temperature hot water and low-temperature cold water preparation functions according to claim 1, characterized in that: The water-side outlet of the intermediate condenser (3) is connected to the intermediate water tank (10) via a pipe. The outlet of the intermediate water tank (10) is connected to the electric heater (11) via a pipe. The outlet of the electric heater (11) is connected to the water-side inlet of the high-temperature evaporator (12) via a pipe. The water-side outlet of the high-temperature evaporator (12) is connected to the water-side inlet of the intermediate condenser (3) via a pipe.

5. The integrated heat pump unit system with both high-temperature hot water and low-temperature cold water preparation functions according to claim 1, characterized in that: The refrigerant inlet of the high-temperature evaporator (12) is connected to the second throttle valve (15) through a pipe. The second throttle valve (15) is connected to the refrigerant outlet of the high-temperature condenser (14) through a pipe. The refrigerant inlet of the high-temperature condenser (14) is connected to the exhaust port of the fixed-frequency compressor (13) through a pipe. The suction port of the fixed-frequency compressor (13) is connected to the refrigerant outlet of the high-temperature evaporator (12) through a pipe.

6. The integrated heat pump unit system with both high-temperature hot water and low-temperature cold water preparation functions according to claim 5, characterized in that: The water-side inlet and outlet of the high-temperature condenser (14) are connected to the high-temperature water tank (19) via pipes.

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