Multi-heat-supply-mode solar auxiliary heat pump system capable of achieving rapid defrosting

Abstract

The utility model discloses a multi-heat-supply-mode solar auxiliary heat pump system capable of achieving rapid defrosting, and relates to the technical field of solar auxiliary heat pumps. Comprising an air-cooled evaporator, a compressor, a condenser and an expansion valve which are connected end to end through pipelines to form a first circulation channel, a water outlet of a solar heat collector is connected with a water inlet pipe of the air-cooled evaporator through a first pipeline, and the solar heat collector, the first pipeline, the air-cooled evaporator and a second pipeline are connected end to end to form a second circulation channel. A circulating pipeline on the condenser extends into the water storage tank, a water inlet pipe of the heat storage tank is connected with a water outlet of the solar heat collector, and a water outlet pipe of the heat storage tank is connected with the second pipeline through a backflow pipeline. According to the multi-heat-supply-mode solar auxiliary heat pump system capable of achieving rapid defrosting, intermittent heating is not needed in the defrosting process, temperature fluctuation is avoided, and the defrosting speed is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of solar energy assisted heat pumps, and more specifically to a solar energy assisted heat pump system with multiple heating modes for rapid defrosting. Background Art

[0002] In the context of energy conservation and emission reduction, the use of clean energy is the general trend. The application of solar energy has almost no pollution to the environment, and its collection and utilization are very flexible. It can be installed and used in a variety of occasions, which plays an important role in alleviating climate change and reducing air pollution.

[0003] The air energy heat pump system is based on heat pump technology, which absorbs heat from the outside air and heats it up, and then transfers the heat to the indoor heating or hot water system. Conventional air energy heat pump systems are generally composed of compressors, evaporators, condensers, etc. These components work together to complete the conversion and transfer of energy.

[0004] In order to reduce system energy consumption and meet heating needs, solar energy is often coupled with air source heat pumps. Solar-Assisted Heat Pump (SAHP) is a heat pump system that uses solar energy as a heat source for auxiliary heating. This system combines the efficient heat collection performance of solar collectors and the energy-saving characteristics of heat pumps, aiming to improve overall energy efficiency and reduce dependence on traditional energy.

[0005] Although solar energy has many advantages, its application is greatly affected by seasons and weather, and its heat flux density is low. The heating operation mode is single, and it is difficult to fully meet the heating needs of users, which limits the application scope of solar direct thermal utilization systems. When the air energy heat pump is in heating conditions, frost often appears on the evaporator surface, which is a key factor affecting the heating effect of the heat pump and seriously affects the working performance of the heat pump. At present, the reverse defrosting technology is mostly used for heat pump air-conditioning units with air-cooled finned tube outdoor units. During reverse defrosting, it will cause interruptions in heating and fluctuations in indoor temperature, reducing comfort. Utility Model Content

[0006] In view of this, the utility model provides a multi-heating mode solar-assisted heat pump system with fast defrosting, aiming to solve the problems in the above-mentioned background technology. During the defrosting process, there is no need to interrupt heating, avoid temperature fluctuations, and speed up the defrosting speed. In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] The utility model discloses a multi-heating mode solar-assisted heat pump system with rapid defrosting, comprising:

[0008] An air source heat pump system comprises an air-cooled evaporator, a compressor, a condenser and an expansion valve, wherein the air-cooled evaporator, the compressor, the condenser and the expansion valve are connected end to end through a pipeline to form a first circulation channel;

[0009] A solar thermal collector, wherein a water outlet of the solar thermal collector is connected to a water inlet pipe of the air-cooled evaporator via a first pipeline, a water inlet of the solar thermal collector is connected to a water outlet pipe of the air-cooled evaporator via a second pipeline, and the solar thermal collector, the first pipeline, the air-cooled evaporator and the second pipeline are connected end to end to form a second circulation channel;

[0010] A water storage tank, wherein a circulation pipeline is arranged on the condenser, the circulation pipeline extends into the water storage tank, a third circulation pump is arranged on the circulation pipeline, and the circulation pipeline is used to heat the water in the water storage tank;

[0011] A heat storage tank, wherein a phase change material is arranged in the heat storage tank, a water inlet pipe of the heat storage tank is connected to a water outlet of the solar thermal collector, a water outlet pipe of the heat storage tank is connected to the second pipeline through a return pipeline, a first solenoid valve is arranged between the heat storage tank and the solar thermal collector, a second solenoid valve is arranged at the connection between the water outlet of the solar thermal collector and the water inlet of the first pipeline, a fifth solenoid valve is arranged on the water inlet pipe of the air-cooled evaporator, and a fourth solenoid valve is arranged on the return pipeline.

[0012] Furthermore, a heating pipe is provided in the water storage tank, a water inlet of the heating pipe is connected to a water outlet of the first pipeline, a water outlet of the heating pipe is connected to a water inlet of the second pipeline, and a second circulation pump is provided on the second pipeline.

[0013] Furthermore, the water outlet pipe of the heat storage tank is also connected to the first pipeline, and a third solenoid valve is provided between the water outlet pipe of the heat storage tank and the first pipeline.

[0014] Furthermore, the water inlet pipe of the air-cooled evaporator is connected to the first pipeline, the water inlet pipe of the air-cooled evaporator is arranged between the third solenoid valve and the water inlet of the heating tube, and the water outlet pipe of the air-cooled evaporator is connected to the second pipeline.

[0015] Furthermore, it also includes an evaporator, which is connected to the first pipeline through a three-way reversing valve, a sixth solenoid valve is arranged between the evaporator and the first pipeline, the three-way reversing valve is arranged between the water inlet pipe of the air-cooled evaporator and the water inlet of the heating tube, the water outlet pipe of the evaporator is connected to the second pipeline, the liquid inlet of the evaporator is connected to the outlet of the expansion valve, the liquid outlet of the evaporator is connected to the liquid inlet of the compressor, a seventh solenoid valve is arranged between the expansion valve and the evaporator, and an eighth solenoid valve is arranged between the expansion valve and the air-cooled evaporator.

[0016] It can be seen from the above technical scheme that compared with the prior art, the utility model discloses a multi-heating mode solar assisted heat pump system with fast defrosting. The refrigerant after absorbing heat in the solar collector flows out from the water outlet of the solar collector, passes through the air-cooled evaporator, and then flows into the water inlet of the solar collector. The refrigerant flowing out of the solar collector flows in the circulation channel formed by the solar collector and the air-cooled evaporator and releases heat, so that the frost on the surface of the air-cooled evaporator melts. During the defrosting process, there is no need to interrupt the heating of the air-cooled evaporator, which avoids temperature fluctuations and speeds up the defrosting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of a multi-heating mode solar-assisted heat pump system for rapid defrosting provided by the utility model.

[0019] In the figure: 1, solar collector; 2, first temperature sensor; 3, second temperature sensor; 4, heat storage tank; 5, third temperature sensor; 6, compressor; 7, condenser; 8, expansion valve; 9, evaporator; 10, air-cooled evaporator; 11, water storage tank; 12, fourth temperature sensor; 13, three-way reversing valve; 14-1, first circulation pump; 14-2, second circulation pump; 14-3, third circulation pump; 15-1, first solenoid valve; 15-2, second solenoid valve; 15-3, third solenoid valve; 15-4, fourth solenoid valve; 15-5, fifth solenoid valve; 15-6, sixth solenoid valve; 15-7, seventh solenoid valve; 15-8, eighth solenoid valve. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1 The utility model discloses a solar-assisted heat pump system with multiple heating modes for rapid defrosting, comprising:

[0022] The air source heat pump system comprises an air-cooled evaporator 10, a compressor 6, a condenser 7 and an expansion valve 8, wherein the air-cooled evaporator 10, the compressor 6, the condenser 7 and the expansion valve 8 are connected end to end through a pipeline to form a first circulation channel;

[0023] A solar thermal collector 1, a water outlet of the solar thermal collector 1 is connected to a water inlet pipe of an air-cooled evaporator 10 via a first pipeline, a water inlet of the solar thermal collector 1 is connected to a water outlet pipe of the air-cooled evaporator 10 via a second pipeline, and the solar thermal collector 1, the first pipeline, the air-cooled evaporator 10 and the second pipeline are connected end to end to form a second circulation channel;

[0024] The water storage tank 11 and the condenser 7 are provided with a circulation pipeline, the circulation pipeline extends into the water storage tank 11, a third circulation pump 14-3 is provided on the circulation pipeline, and the circulation pipeline is used to heat the water in the water storage tank 11;

[0025] A heat storage tank 4 is provided with a phase change material, a water inlet pipe of the heat storage tank 4 is connected to a water outlet of the solar thermal collector 1, a water outlet pipe of the heat storage tank 4 is connected to the second pipeline through a reflux pipeline, a first solenoid valve 15-1 is provided between the heat storage tank 4 and the solar thermal collector 1, and a second solenoid valve 15-2 is provided at the connection between the water outlet of the solar thermal collector 1 and the water inlet of the first pipeline.

[0026] A fifth solenoid valve 15 - 5 is provided on the water inlet pipe of the air-cooled evaporator 10 , and a fourth solenoid valve 15 - 4 is provided on the return pipe.

[0027] When the air-cooled evaporator 10 needs to be defrosted and there is sufficient solar energy, the fifth solenoid valve 15-5 and the second solenoid valve 15-2 are opened, and the other solenoid valves are closed. The refrigerant in the solar collector 1 flows in the second circulation channel and releases heat. The refrigerant flowing out of the solar collector 1 heats the surface of the air-cooled evaporator 10 during the heat release process, so that the frost on the surface of the air-cooled evaporator 10 melts without absorbing heat from the room, preventing indoor temperature fluctuations and thus ensuring indoor temperature comfort. The system does not need to run in reverse, avoiding the disadvantage of the traditional defrosting method having a large impact on the system and improving system stability.

[0028] When solar energy is insufficient, the water in the water tank 11 is heated by the condenser 7, and the compressor 6 increases the pressure and temperature of the low-temperature and low-pressure refrigerant gas to become a high-temperature and high-pressure refrigerant gas, which enters the condenser 7 and heats the water in the water tank 11. At this time, the temperature of the refrigerant is reduced and discharged from the water outlet of the condenser 7. The gaseous refrigerant is then depressurized by the expansion valve 8 to form a low-temperature and low-pressure fluid. The refrigerant then enters the air-cooled evaporator 10, which absorbs heat from the outside air to evaporate the refrigerant liquid into gas. The refrigerant coming out of the air-cooled evaporator 10 returns to the compressor 6 and returns to its initial state, and the refrigerant completes a closed cycle.

[0029] When the solar energy is sufficient, the first solenoid valve 15-1 and the fifth solenoid valve 15-4 are opened, and the other solenoid valves are closed. The coolant in the solar collector 1 flows out from the water outlet of the solar collector 1, enters the heat storage tank 4 through the water inlet pipe of the heat storage tank 4, and exchanges heat with the phase change material in the heat storage tank 4. The coolant flowing out of the solar collector 1 releases heat and flows out through the water outlet pipe of the heat storage tank 4, passes through the second pipeline, and then enters the solar collector 1 through the water inlet of the solar collector 1 to absorb heat.

[0030] According to some embodiments provided by the utility model, a heating pipe is arranged in the water tank 11, a first pipeline is connected to the water outlet of the solar thermal collector 1, a second pipeline is arranged at the water inlet of the solar thermal collector 1, the water outlet of the first pipeline is connected to the water inlet of the heating pipe, the water outlet of the heating pipe is connected to the water inlet of the second pipeline, and a second circulation pump 14-2 is arranged on the second pipeline.

[0031] A first temperature sensor 2 is arranged at the water outlet of the solar thermal collector 1 .

[0032] When the solar energy is sufficient and the temperature measured by the first temperature sensor 2 reaches the heating demand, the second solenoid valve 15-2 is opened and the other solenoid valves are closed. The refrigerant after absorbing heat in the solar collector 1 flows out from the water outlet of the solar collector 1 and passes through the first pipeline. It enters the heating pipe from the water inlet of the heating pipe to heat the water in the water tank 11, and then enters the second pipeline from the water outlet of the heating pipe. Under the action of the second circulation pump 14-2, the refrigerant in the second pipeline enters the solar collector 1 from the water inlet of the solar collector 1 to reabsorb heat, completing a heating cycle.

[0033] A fourth temperature sensor 12 is arranged in the water storage tank 11. When the heat generated by the solar energy is sufficient, after the temperature measured by the fourth temperature sensor 12 reaches a certain value, the first solenoid valve 15-1 is opened, and the other solenoid valves are closed. The coolant in the solar thermal collector 1 flows out from the water outlet of the solar thermal collector 1, enters the heat storage tank 4 through the water inlet pipe of the heat storage tank 4, exchanges heat with the phase change material in the heat storage tank 4, and the coolant flowing out of the solar thermal collector 1 releases heat and then flows out through the water outlet pipe of the heat storage tank 4, passes through the second pipeline, and then enters the solar thermal collector 1 through the water inlet of the solar thermal collector 1 to absorb heat.

[0034] According to some embodiments provided by the utility model, the water outlet pipe of the heat storage tank 4 is also connected to the first pipeline, and a third solenoid valve 15-3 is provided between the water outlet pipe of the heat storage tank 4 and the first pipeline.

[0035] A second temperature sensor 3 is arranged in the heat storage tank 4. When the solar energy is insufficient and the second temperature sensor 3 reaches a certain value, the third solenoid valve 15-3 is opened and the other solenoid valves are closed. The heat stored in the heat storage tank 4 flows out through the outlet pipe of the heat storage tank 4 and enters the heating pipe through the first pipeline to complete the heating of the water in the water storage tank 11. The fluid after the heat exchange enters the second pipeline from the outlet pipe of the water storage tank 11 and flows along the second pipeline, and finally enters the solar collector 1 from the water inlet of the solar collector 1.

[0036] According to some embodiments provided by the utility model, a first circulation pump 14-1 is also included. The heated water in the water tank 11 is delivered into the user's room through the first circulation pump 14-1 to complete the heating.

[0037] According to some embodiments provided by the utility model, the water inlet pipe of the air-cooled evaporator 10 is connected to the first pipeline, the water inlet pipe of the air-cooled evaporator 10 is arranged between the third solenoid valve 15-3 and the water inlet of the heating pipe, and the water outlet pipe of the air-cooled evaporator 10 is connected to the second pipeline.

[0038] When there is a need to defrost the surface of the air-cooled evaporator 10 and there is insufficient sunlight, the third solenoid valve 15-3 and the fifth solenoid valve 15-5 are opened, and the other solenoid valves are closed. The heat stored in the heat storage tank 4 flows out through the outlet pipe of the heat storage tank 4 and enters the air-cooled evaporator 10 through the first pipeline. The heat is exchanged with the frost on the fin surface of the air-cooled evaporator 10, thereby removing the frost on the surface of the air-cooled evaporator 10. The gas after the heat exchange returns to the solar collector 1 through the second pipeline.

[0039] According to some embodiments provided by the utility model, a third temperature sensor 5 is arranged on the first pipeline between the third solenoid valve 15-3 and the water inlet pipe of the air-cooled evaporator 10. When the temperature measured by the second temperature sensor 3 is insufficient, if the temperature measured by the third temperature sensor 5 meets the heating demand, the second solenoid valve 15-2 and the third solenoid valve 15-3 are opened, and the other solenoid valves are closed, and the heat generated by the solar collector 1 and the heat released by the heat storage tank 4 are used to heat the water in the water storage tank 11.

[0040] According to some embodiments provided by the utility model, it also includes an evaporator 9, which is connected to the first pipeline through a three-way reversing valve 13, and a sixth solenoid valve 15-6 is arranged between the evaporator 9 and the first pipeline. The three-way reversing valve 13 is arranged between the water inlet pipe of the air-cooled evaporator 10 and the water inlet of the heating pipe, the water outlet pipe of the evaporator 9 is connected to the second pipeline, the liquid inlet of the evaporator 9 is connected to the outlet of the expansion valve 8, and the liquid outlet of the evaporator 9 is connected to the liquid inlet of the compressor 6. A seventh solenoid valve 15-7 is arranged between the expansion valve 8 and the evaporator 9, and an eighth solenoid valve 15-8 is arranged between the expansion valve 8 and the air-cooled evaporator 10.

[0041] When the light conditions are insufficient, the heat collected by the solar collector 1 is insufficient to meet the user's heating needs. The second solenoid valve 15-2, the third solenoid valve 15-3, the sixth solenoid valve 15-6 and the seventh solenoid valve 15-7 are opened, and the other solenoid valves are closed. At this time, the solar heat serves as the heat source of the evaporator 9, and the refrigerant carrying the solar heat flows out from the water outlet of the solar collector 1, and the refrigerant carrying the heat flows out from the heat storage tank 4. The two fluids flow to the three-way reversing valve 13 through the first pipeline, flow through the evaporator 9 and exchange heat, and then flow back to the solar collector 1. At this time, the refrigerant in the condenser 7 flows out from the water outlet pipe of the condenser 7 and enters the evaporator 9 through the expansion valve 8, and exchanges heat with the refrigerant carrying heat in the evaporator 9 to make the refrigerant become gas. The refrigerant after heat exchange is compressed by the compressor 6 and enters the condenser 7 through the water inlet pipe of the condenser 7 to heat the water in the water storage tank 11.

[0042] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-heating mode solar-assisted heat pump system with rapid defrosting, characterized in that: include: An air source heat pump system comprises an air-cooled evaporator, a compressor, a condenser and an expansion valve, wherein the air-cooled evaporator, the compressor, the condenser and the expansion valve are connected end to end through a pipeline to form a first circulation channel; A solar thermal collector, wherein a water outlet of the solar thermal collector is connected to a water inlet pipe of the air-cooled evaporator via a first pipeline, a water inlet of the solar thermal collector is connected to a water outlet pipe of the air-cooled evaporator via a second pipeline, and the solar thermal collector, the first pipeline, the air-cooled evaporator and the second pipeline are connected end to end to form a second circulation channel; A water storage tank, wherein a circulation pipeline is arranged on the condenser, the circulation pipeline extends into the water storage tank, a third circulation pump is arranged on the circulation pipeline, and the circulation pipeline is used to heat the water in the water storage tank; A heat storage tank, wherein a phase change material is arranged in the heat storage tank, a water inlet pipe of the heat storage tank is connected to a water outlet of the solar thermal collector, a water outlet pipe of the heat storage tank is connected to the second pipeline through a return pipeline, a first solenoid valve is arranged between the heat storage tank and the solar thermal collector, a second solenoid valve is arranged at the connection between the water outlet of the solar thermal collector and the water inlet of the first pipeline, a fifth solenoid valve is arranged on the water inlet pipe of the air-cooled evaporator, and a fourth solenoid valve is arranged on the return pipeline.

2. The multi-heating mode solar-assisted heat pump system for rapid defrosting according to claim 1 is characterized in that: A heating pipe is arranged in the water storage tank, the water inlet of the heating pipe is connected to the water outlet of the first pipeline, the water outlet of the heating pipe is connected to the water inlet of the second pipeline, and a second circulation pump is arranged on the second pipeline.

3. The multi-heating mode solar-assisted heat pump system for rapid defrosting according to claim 2 is characterized in that: The water outlet pipe of the heat storage tank is also connected to the first pipeline, and a third solenoid valve is arranged between the water outlet pipe of the heat storage tank and the first pipeline.

4. The multi-heating mode solar-assisted heat pump system for rapid defrosting according to claim 3 is characterized in that: The water inlet pipe of the air-cooled evaporator is connected to the first pipeline, the water inlet pipe of the air-cooled evaporator is arranged between the third solenoid valve and the water inlet of the heating tube, and the water outlet pipe of the air-cooled evaporator is connected to the second pipeline.

5. The multi-heating mode solar-assisted heat pump system for rapid defrosting according to claim 2, characterized in that: It also includes an evaporator, which is connected to the first pipeline through a three-way reversing valve, a sixth solenoid valve is arranged between the evaporator and the first pipeline, the three-way reversing valve is arranged between the water inlet pipe of the air-cooled evaporator and the water inlet of the heating tube, the water outlet pipe of the evaporator is connected to the second pipeline, the liquid inlet of the evaporator is connected to the outlet of the expansion valve, the liquid outlet of the evaporator is connected to the liquid inlet of the compressor, a seventh solenoid valve is arranged between the expansion valve and the evaporator, and an eighth solenoid valve is arranged between the expansion valve and the air-cooled evaporator.

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