Heat pump heat supply device and solar heating system comprising same

Abstract

The utility model discloses a heat pump heat supply device and a solar heating system comprising the heat pump heat supply device in the field of thermal devices, which comprise a compressor, an evaporation heat exchanger, a condensation heat exchanger, an expansion valve, a medium inlet, a medium outlet, a water supply port and a water return port, the output end of the heating circulating pump is connected with a water supply port, and the evaporation heat exchanger comprises an evaporator refrigerant inlet, an evaporator refrigerant outlet connected with an air suction port of the compressor, an evaporator water inlet connected with the output end of the evaporation side circulating pump and an evaporator water outlet communicated with a medium outlet. The condensing heat exchanger comprises a condenser refrigerant inlet connected with the compressor exhaust port, a condenser refrigerant outlet communicated with the evaporator refrigerant inlet, a condenser water inlet communicated with the water return port and a condenser water outlet connected with the water supply port, and the medium outlet is communicated with the water return port. According to the utility model, the problem of heating under the condition that the temperature of the heat storage water tank is lower can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal devices, and particularly relates to a heat pump heating device and a solar heating system comprising the device. Background Art

[0002] With more and more successful cases of solar heating in the north, this low-energy heating method has become more and more popular. The general practice is to install solar collectors on the roof of the building, circulate the hot water generated by the collector to the hot water storage tank through the heat collection circulation pump, and turn on the heating circulation pump after the water temperature reaches the set temperature to circulate the hot water to the terminal radiator for heating. Indoor heating terminals in northern regions are mostly radiator radiators. According to the relevant requirements of the "Design Code for Heating, Ventilation and Air Conditioning of Civil Buildings" GB50736-2012, "The radiator heating system should use hot water as the heat medium, and the radiator central heating system should be designed for continuous heating at a heat medium temperature of 75 / 50℃ or 85 / 60℃." It can be seen that the design water supply temperature should not be lower than 75℃. Without increasing the number of radiators or increasing the number of radiators, higher water temperatures can achieve better heating effects. In traditional solar heating systems, during the day, the water supply temperature changes continuously with the working conditions of the solar collector, and at night the water supply temperature continues to drop, resulting in a constant change in the terminal heating effect and a poor user experience. Once the temperature of the hot water storage tank is lower than 40°C, it cannot be used directly for radiator heating. However, at this temperature, the hot water storage tank still contains a large amount of thermal energy. The solar collector has the characteristic that the photothermal conversion efficiency decreases as the working water temperature increases. In addition, the heat loss is also greater at higher temperatures, resulting in a significant decrease in the daily heat gain when operating at high water temperatures compared to low water temperatures. How to make full use of free solar energy to solve the problem of heating when the temperature of the hot water storage tank is low, and then ensure the photothermal conversion efficiency of the solar collector is a problem that technicians in this field urgently need to solve. Utility Model Content

[0003] The purpose of the utility model is to provide a heat pump heating device and a solar heating system including the device. Compared with the traditional solar heating system, the system can fully utilize the heat of the solar collector and the water storage tank, reduce the operating temperature of the collector, increase the daily heat available in the system, significantly improve the operating cost, improve the utilization rate of the equipment, and enhance the user experience.

[0004] The purpose of the utility model is achieved as follows: a heat pump heating device, comprising a compressor, an evaporative heat exchanger, a condensing heat exchanger, an expansion valve, an evaporation side circulation pump, a heating circulation pump, a medium inlet, a medium outlet, a water supply port and a water return port, wherein the medium inlet is respectively connected to the evaporation side circulation pump input end and the heating circulation pump input end through a pipeline, and the heating circulation pump output end is connected to the water supply port, the evaporative heat exchanger comprises an evaporator refrigerant inlet, an evaporator refrigerant outlet connected to the compressor suction port, an evaporator water inlet connected to the evaporator side circulation pump output end and an evaporator water outlet communicated with the medium outlet, the condensing heat exchanger comprises a condenser refrigerant inlet connected to the compressor exhaust port, a condenser refrigerant outlet communicated with the evaporator refrigerant inlet, a condenser water inlet communicated with the water return port, and a condenser water outlet connected to the water supply port, the expansion valve is arranged on a pipeline connecting the evaporator refrigerant inlet and the condenser refrigerant outlet, and the medium outlet and the water return port are communicated through a pipeline.

[0005] When the utility model is used, the medium inlet and the medium outlet are connected to the hot water storage tank; when the temperature of the hot water storage tank cannot be directly used for radiator heating, the heat pump heating device is turned on, and the evaporation side circulation pump transports the water in the hot water storage tank to the evaporative heat exchanger, and transfers the heat to the refrigerant in the evaporative heat exchanger; the gas-liquid mixed refrigerant evaporates through the evaporative heat exchanger and enters the compressor suction port, and is compressed by the compressor and discharges the high-temperature and high-pressure refrigerant gas; the gas enters the condensing heat exchanger to condense and release heat, and transfers the heat to the water in the condensing heat exchanger; the hot water is transported to the heating terminal radiator through the water supply port for heating, and the heated water enters the condensing heat exchanger through the return water port for circulation, and the refrigerant becomes liquid after condensation; the liquid refrigerant enters the evaporative heat exchanger after throttling by the expansion valve to absorb heat and evaporate, and the evaporated gaseous refrigerant returns to the compressor for compression, and this cycle is repeated to continuously transfer the heat of the hot water storage tank to the terminal radiator, and at the same time obtain a higher water temperature to ensure the heating effect. Compared with the prior art, the beneficial effects of the utility model are: there is no need to replace or add the heating terminal radiator. By starting the heat pump heating device, heating can still be carried out when the temperature of the solar collector and the water storage tank is low, and a higher water supply temperature can be guaranteed; compared with the traditional solar heating system, the heat of the solar collector and the water storage tank can be fully utilized, thereby reducing the operating temperature of the collector, increasing the daily heat available in the system, significantly improving the operating cost, improving the utilization rate of the original equipment, and enhancing the user experience.

[0006] As a further improvement of the utility model, a terminal circulation pump is provided on the pipeline connecting the water outlet of the cooling device and the water supply port, and a one-way valve three is provided at the output end of the heating circulation pump, the flow direction of which points to the water supply port.

[0007] As a further improvement of the utility model, a second one-way valve with the flow direction directed to the water supply port is provided at the output end of the terminal circulation pump.

[0008] As a further improvement of the utility model, it also includes a three-way valve provided with an inlet a, an outlet b and a reversing port c, the inlet a is connected to the input end of the heating circulation pump, the outlet b is connected to the medium inlet, the reversing port c is connected to the water outlet of the refrigeration device, and the two states of the three-way valve are that the inlet a is connected to the outlet b or the inlet a is connected to the reversing port c.

[0009] As a further improvement of the utility model, a one-way valve 1 is provided at the output end of the evaporation-side circulation pump, the flow direction of which is directed to the water inlet of the evaporator.

[0010] The utility model also provides a solar heating system, comprising any of the above-mentioned heat pump heating devices, and also comprising a solar collector, a heat storage tank and a heat collection circulation pump, the heat storage tank comprising circulation port 1, circulation port 2, circulation port 3 and circulation port 4, the circulation port 1 and circulation port 2 are respectively connected to the medium inlet and the medium outlet, the circulation port 3 is connected to the collector output end of the solar collector, the circulation port 4 is connected to the heat collection circulation pump input end, and the heat collection circulation pump output end is connected to the collector input end. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of the first embodiment of the present utility model.

[0012] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present utility model.

[0013] Among them, 1. compressor; 2. evaporation heat exchanger; 3. condensation heat exchanger; 4. expansion valve; 5. evaporation side circulation pump; 6. terminal circulation pump; 7. heating circulation pump; 8. medium inlet; 9. medium outlet; 10. water supply port; 11. return water port; 12. hot water storage tank; 13. solar collector; 14. heat collection circulation pump; 15. three-way valve; 21. evaporator refrigerant inlet; 22. evaporator refrigerant outlet; 23. , evaporator water inlet; 24, evaporator water outlet; 31, condenser refrigerant inlet; 32, condenser refrigerant outlet; 33, condenser water inlet; 34, condenser water outlet; 51, one-way valve 1; 61, one-way valve 2; 71, one-way valve 3; 121, circulation port 1; 122, circulation port 2; 123, circulation port 3; 124, circulation port 4; 131, collector input; 132, collector output. DETAILED DESCRIPTION Embodiment 1

[0014] like Figure 1As shown, a solar heating system includes a heat pump heating device, a solar collector 13, a hot water storage tank 12 and a heat collection circulation pump 14; the heat pump heating device includes a compressor 1, an evaporation heat exchanger 2, a condensation heat exchanger 3, an expansion valve 4, an evaporation side circulation pump 5, a heating circulation pump 7, a medium inlet 8, a medium outlet 9, a water supply port 10 and a return port 11, the medium inlet 8 is connected to the input end of the evaporation side circulation pump 5 and the input end of the heating circulation pump 7 through a pipeline, and the output end of the heating circulation pump 7 is connected to the supply port 11. The evaporation heat exchanger 2 includes an evaporator refrigerant inlet 21, an evaporator refrigerant outlet 22 connected to the air intake of the compressor 1, an evaporator water inlet 23 connected to the output end of the evaporation side circulation pump 5, and an evaporator water outlet 24 connected to the medium outlet 9. The condensation heat exchanger 3 includes a condenser refrigerant inlet 31 connected to the exhaust port of the compressor 1, a condenser refrigerant outlet 32 ​​connected to the evaporator refrigerant inlet 21, a condenser water inlet 33 connected to the water return port 11, and a condenser water outlet 34 connected to the water supply port 9. 10 is connected to the condenser water outlet 34, the expansion valve 4 is arranged on the pipeline connecting the evaporator refrigerant inlet 21 and the condenser refrigerant outlet 32, and the medium outlet 9 and the return water port 11 are connected through a pipeline; the pipeline connecting the condenser water outlet 34 and the water supply port 10 is provided with a terminal circulation pump 6, and the output end of the heating circulation pump 7 is provided with a check valve 3 71 that flows to the water supply port 10; the output end of the terminal circulation pump 6 is provided with a check valve 2 61 that flows to the water supply port 10; the output end of the evaporation side circulation pump 5 A one-way valve 51 is provided, the flow direction of which points to the evaporator water inlet 23; the hot water storage tank 12 includes a circulation port 121, a circulation port 2 122, a circulation port 3 123 and a circulation port 4 124, the circulation port 121 and the circulation port 2 122 are respectively connected to the medium inlet 8 and the medium outlet 9, the circulation port 3 123 is connected to the collector output end 132 of the solar collector 13, the circulation port 4 124 is connected to the input end of the heat collection circulation pump 14, and the output end of the heat collection circulation pump 14 is connected to the collector input end 131. Embodiment 2

[0015] like Figure 2 As shown, the difference between this embodiment and the first embodiment is that a three-way valve 15 is used to replace the terminal circulation pump 6, the second one-way valve 61 and the third one-way valve 71; specifically, the three-way valve 15 includes an inlet a, an outlet b and a reversing port c, the inlet a is connected to the input end of the heating circulation pump 7, the outlet b is connected to the medium inlet 8, the reversing port c is connected to the water outlet 34 of the cooling device, and the two states of the three-way valve 15 are that the inlet a is connected to the outlet b or the inlet a is connected to the reversing port c.

[0016] The working mode of this system is as follows:

[0017] 1. Solar heating mode

[0018] The solar collector 13 and the hot water storage tank 12 run a temperature difference cycle to continuously heat the water in the hot water storage tank 12. After the water temperature reaches the set temperature, the heating circulation pump 7 is turned on. At this time, the hot water in the hot water storage tank 12 is pumped out through the medium inlet 8 by the heating circulation pump 7 and sent to the heating terminal radiator through the water supply port 10. The heated water enters the hot water storage tank 12 through the return water port 11 and the medium outlet 9 in turn, and circulates back and forth in sequence to achieve the purpose of heating.

[0019] In the second embodiment, in this mode, the heating circulation pump 7 is turned on, the inlet a and the outlet b of the three-way valve 15 are connected, and the working principle is the same as above.

[0020] 2. Heat Pump Heating Mode

[0021] When the temperature of the hot water storage tank 12 drops and is lower than the set solar heating temperature, the heating circulation pump 7 is turned off, and the compressor 1, the evaporation side circulation pump 5 and the terminal circulation pump 6 are turned on at this time. The evaporation side circulation pump 5 pumps the water of the hot water storage tank 12 into the evaporation heat exchanger 2, and transfers the heat to the refrigerant in the evaporation heat exchanger 2. The gas-liquid mixed refrigerant evaporates in the evaporation heat exchanger 2 and enters the compressor 1 for compression. The discharged high-temperature and high-pressure refrigerant gas enters the condensation heat exchanger 3 to condense and release heat, and transfers the heat to the water in the condensation heat exchanger 3. It is pumped into the heating terminal radiator through the terminal circulation pump 6 for heating. The heated water enters the condensation heat exchanger 3 through the return water port 11 for circulation; the refrigerant becomes liquid after condensation, and the liquid refrigerant enters the evaporation heat exchanger 2 after throttling by the expansion valve 4 to absorb heat and evaporate. The evaporated gaseous refrigerant returns to the compressor 1, and the cycle is repeated to continuously transfer the heat of the hot water storage tank 12 to the terminal radiator, and at the same time obtain a higher water temperature to ensure the heating effect.

[0022] In the second embodiment, in this mode, the compressor 1, the evaporation side circulation pump 5 and the heating circulation pump 7 are turned on, and the inlet a of the three-way valve 15 is connected to the reversing port c, and the working principle is the same as above.

[0023] The advantages of the utility model are: when the temperature of the solar collector 13 and the water storage tank 12 is low, heating can still be carried out by starting the heat pump heating mode, and a high water supply temperature can be guaranteed, thereby reducing the energy consumption of the auxiliary heat source turned on due to the low temperature of the water storage tank 12 and reducing the operating cost; by turning on the heat collection circulation pump 14, while ensuring heating, the operating temperature of the solar collector 13 is further reduced, the daily heat available from the collector is increased, and at the same time, heat loss is reduced, thereby improving system efficiency.

[0024] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present utility model, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. A heat pump heating device, characterized in that: It includes a compressor, an evaporative heat exchanger, a condensing heat exchanger, an expansion valve, an evaporative side circulation pump, a heating circulation pump, a medium inlet, a medium outlet, a water supply port and a return port. The medium inlet is respectively connected to the evaporative side circulation pump input end and the heating circulation pump input end through pipelines, and the heating circulation pump output end is connected to the water supply port. The evaporative heat exchanger includes an evaporator refrigerant inlet, an evaporator refrigerant outlet connected to the compressor suction port, an evaporator water inlet connected to the evaporative side circulation pump output end, and an evaporator water outlet connected to the medium outlet. The condensing heat exchanger includes a condenser refrigerant inlet connected to the compressor exhaust port, a condenser refrigerant outlet connected to the evaporator refrigerant inlet, a condenser water inlet connected to the return port, and a condenser water outlet connected to the water supply port. The expansion valve is arranged on the pipeline connecting the evaporator refrigerant inlet and the condenser refrigerant outlet, and the medium outlet and the return port are connected through a pipeline.

2. A heat pump heating device according to claim 1, characterized in that: A terminal circulation pump is arranged on the pipeline connecting the water outlet of the cooling device and the water supply port, and a one-way valve three is arranged at the output end of the heating circulation pump, the flow direction of which points to the water supply port.

3. A heat pump heating device according to claim 2, characterized in that: The output end of the terminal circulation pump is provided with a one-way valve 2 whose flow direction points to the water supply port.

4. A heat pump heating device according to claim 1, characterized in that: It also includes a three-way valve with an inlet a, an outlet b and a reversing port c, wherein the inlet a is connected to the input end of the heating circulation pump, the outlet b is connected to the medium inlet, and the reversing port c is connected to the water outlet of the cooling device. The two states of the three-way valve are that the inlet a is connected to the outlet b or the inlet a is connected to the reversing port c.

5. A heat pump heating device according to claim 1, characterized in that: The output end of the evaporation side circulation pump is provided with a one-way valve 1 whose flow direction is directed to the water inlet of the evaporator.

6. A solar heating system, characterized in that: It includes the heat pump heating device as described in any one of claims 1 to 5, and also includes a solar collector, a hot water storage tank and a heat collection circulation pump, the hot water storage tank includes circulation port 1, circulation port 2, circulation port 3 and circulation port 4, the circulation port 1 and circulation port 2 are respectively connected to the medium inlet and the medium outlet, the circulation port 3 is connected to the collector output end of the solar collector, the circulation port 4 is connected to the heat collection circulation pump input end, and the heat collection circulation pump output end is connected to the collector input end.

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