A circulating heating-cooling-hot water system based on solar photovoltaic direct drive

Abstract

The application discloses a kind of based on solar photovoltaic direct drive's circulating heating-cooling-hot water system.The system contains two subsystems, wherein heating-cooling-hot water system is composed of PV / T component, compressor, intermediate cooler, three electronic expansion valves, eight three-way valves, a four-way valve, first heat exchanger, second heat exchanger, third heat exchanger, fourth heat exchanger and heat preservation water tank;Solar photovoltaic system is composed of photovoltaic component, photovoltaic controller and inverter.The electric energy required by heat pump system is directly driven by solar photovoltaic, and the system is provided with battery and can store additional electric energy.The third heat exchanger exchanges heat with bathing wastewater.The fourth heat exchanger is connected with solar PV / T component, absorbs heat as heat pump heat source.The refrigerant flow in first heat exchanger and second heat exchanger is adjusted by first three-way valve, to realize dynamic and accurate adjustment of refrigerating capacity in temperature zone.

Description

Technical Field

[0001] This invention relates to the fields of PV / T air conditioning and hot water technology, and in particular to a circulating heating-cooling-hot water system based on direct solar photovoltaic drive. Background Technology

[0002] The demand for domestic hot water and cooling in summer and domestic hot water and heating in winter is a basic necessity for people to achieve a better life. To achieve this goal, two independent systems, air conditioning and water heaters, are usually required. These systems consume a lot of electricity, emit a lot of carbon, and are large, immobile, and can only be used in fixed buildings. Traditional air conditioning and hot water systems are not suitable for outdoor areas or remote areas without power grid access. Summary of the Invention

[0003] The purpose of this invention is to address the problems existing in the background technology by proposing a solar photovoltaic direct-drive circulating heating-cooling-hot water system that can simultaneously meet the needs of indoor heating and domestic hot water in winter, as well as indoor cooling and domestic hot water in summer. At the same time, it improves heating efficiency, reduces system energy consumption and carbon emissions, and solves the heating-cooling-hot water needs of outdoor areas and remote areas without power grid access.

[0004] The technical solution of the present invention is a circulating heating-cooling-hot water system based on direct drive of solar photovoltaic, comprising a heating-cooling-hot water system and a solar photovoltaic electronic system;

[0005] The heating-cooling-hot water system includes PV / T components, compressor, cooler, three-way valve, four-way valve, expansion valve, heat exchanger, and piping for connection. The refrigerant flows through the system via the piping.

[0006] The compressor includes a low-pressure stage compressor and a high-pressure stage compressor; the heat exchanger includes a first heat exchanger, a second heat exchanger, a third heat exchanger, and a fourth heat exchanger; multiple three-way valves and expansion valves are installed on the pipes used for connection;

[0007] The solar photovoltaic electronic system includes photovoltaic modules, photovoltaic controllers, inverters, and batteries; multiple photovoltaic modules are installed and integrated on the PV / T module; the electrical energy output by the PV / T module is stored in the battery through the photovoltaic controller; the DC power output from the photovoltaic controller is sent to the power supply terminals of the low-voltage compressor, the high-voltage compressor, and the DC water pump.

[0008] The low-pressure stage compressor is connected to the inlet of the high-pressure stage compressor via a cooler; the refrigerant is compressed to a high temperature and high pressure state by the two-stage compressor; the outlet of the high-pressure stage compressor is connected to the first inlet of the first heat exchanger; the second inlet of the first heat exchanger is connected to a water source, and the second outlet is connected to an insulated water tank; the incoming water source condenses the refrigerant to produce high-temperature domestic hot water, which is stored in the insulated water tank.

[0009] The first outlet of the first heat exchanger is divided into two branches via a three-way valve. One branch is connected to the inlet of the second heat exchanger via an expansion valve, where the refrigerant heats the water to produce medium-temperature hot water. The other branch is connected to the first inlet of the fourth heat exchanger via an expansion valve. The outlet of the second heat exchanger is connected to the first inlet of the third heat exchanger. The first outlet of the third heat exchanger is connected to the inlet of the low-pressure stage compressor, forming a refrigerant circulation loop. The second inlet of the third heat exchanger is connected to the bath wastewater outlet, and the second outlet of the third heat exchanger is connected to the wastewater recycling tank, where the refrigerant absorbs heat from the wastewater.

[0010] The second inlet end of the fourth heat exchanger is connected to the outlet end of the PV / T module, and the second outlet end of the fourth heat exchanger is connected to the inlet end of the PV / T module. The fourth heat exchanger absorbs heat as a heat source for the heat pump to cool the PV / T module. The four-way reversing valve is used to realize the switching between winter and summer operation modes of the circulation. In winter, it can simultaneously provide domestic hot water and indoor low-temperature heating, and in summer, it can simultaneously meet the needs of domestic hot water and indoor cooling.

[0011] Compared with the prior art, the present invention has the following beneficial technical effects:

[0012] 1. This invention can meet the needs of indoor heating and domestic hot water in winter, as well as the needs of domestic hot water and indoor cooling in summer. It realizes that a single set of equipment can meet the year-round needs of HVAC equipment in both residential and commercial environments. Compared with existing equipment, the equipment is simpler and has a higher utilization rate.

[0013] 2. This invention has a high degree of comprehensive utilization of solar energy and does not require grid connection. Theoretically, apart from the initial investment cost, there are no operating costs. It can even supply power to other products, reducing the burden on the grid, greatly saving energy consumption, and may even achieve "zero energy consumption". Furthermore, the system does not increase carbon dioxide emissions during use.

[0014] 3. The system of the present invention does not rely on the power grid and the equipment is small in size, so it can be used outdoors to meet the living and working needs of long-term outdoor workers.

[0015] 4. The system of this invention not only has a storage battery to store the additional electrical energy generated by the photovoltaic modules, making it convenient to use the storage battery to power the entire system at night and on rainy days, ensuring the reliability of the system in various weather conditions, but also has multiple working modes to meet different user needs. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the present invention;

[0017] Figure 2 This is the operating diagram for sunny summer conditions;

[0018] Figure 3 This is the operating diagram for a sunny winter day when indoor heating demand is high.

[0019] Figure 4 This is the operating diagram for a sunny winter day when the demand for domestic hot water is high.

[0020] Figure 5 Operating diagram of a single wastewater source heat pump under cloudy winter conditions;

[0021] Figure 6 This is the operating diagram of a single sewage source heat pump under cloudy conditions.

[0022] Reference numerals: 1. Low-pressure stage compressor; 2. Cooler; 3. First three-way valve; 4. High-pressure stage compressor; 5. First heat exchanger; 6. Second three-way valve; 7. First expansion valve; 8. Third three-way valve; 9. Fourth three-way valve; 10. Second heat exchanger; 11. Second expansion valve; 12. Fifth three-way valve; 13. Third heat exchanger; 14. Sixth three-way valve; 15. Seventh three-way valve; 16. Four-way valve; 17. Fourth heat exchanger; 18. Eighth three-way valve; 19. Third expansion valve; 20. DC water pump; 21. Water inlet; 22. PV / T module; 23. Battery; 24. Photovoltaic controller; 25. Inverter; 26. Water source; 27. Insulated water tank. Detailed Implementation

[0023] Example 1

[0024] like Figure 1-6 As shown, the present invention proposes a circulating heating-cooling-hot water system based on direct solar photovoltaic drive. The system consists of two subsystems: a heating-cooling-hot water system and a solar photovoltaic electronic system.

[0025] The solar photovoltaic electronic system consists of six photovoltaic modules, a photovoltaic controller 24, an inverter 25, and a battery 23. The heating-cooling-hot water system consists of a PV / T module 22, a low-pressure stage compressor 1, a cooler 2, a first three-way valve 3, a high-pressure stage compressor 4, a first heat exchanger, a second three-way valve 6, a first expansion valve 7, a third three-way valve 8, a fourth three-way valve 9, a second heat exchanger 10, a second expansion valve 11, a fifth three-way valve 12, a third heat exchanger 13, a sixth three-way valve 14, a seventh three-way valve 15, a four-way valve 16, a fourth heat exchanger 17, an eighth three-way valve 18, and a third expansion valve 19. The refrigerant flows through the system via pipes, and a DC water pump 20 drives the circulating water to flow within the system. A water inlet 21 is provided on the pipes for convenient water replenishment to the PV / T module 22.

[0026] First, the outlet of the low-pressure stage compressor 1 is connected to the inlet of the cooler 2. The outlet of the cooler 2 is connected to the first inlet of the first three-way valve 3. The first outlet of the first three-way valve 3 is connected to the inlet of the high-pressure stage compressor 4. The outlet of the high-pressure stage compressor 4 is connected to the first inlet of the first heat exchanger. The first outlet of the first heat exchanger is connected to the inlet of the second three-way valve 6. The first outlet of the second three-way valve 6 is connected to the inlet of the first expansion valve 7. The outlet of the first expansion valve 7 is connected to the inlet of the third three-way valve 8. The first outlet of the third three-way valve 8 is connected to the fourth three-way valve. The first inlet end of valve 9 is connected to the outlet end of the fourth three-way valve 9, which is connected to the inlet end of the second heat exchanger 10. The outlet end of the second heat exchanger 10 is connected to the inlet end of the second expansion valve 11, which is connected to the inlet end of the fifth three-way valve 12. The first outlet end of the fifth three-way valve 12 is connected to the first inlet end of the third heat exchanger 13, which is connected to the first inlet end of the sixth three-way valve 14. The outlet end of the sixth three-way valve 14 is connected to the first inlet end of the seventh three-way valve 15, and the outlet end of the seventh three-way valve 15 is connected to the first port of the four-way valve 16. The second port of the four-way valve 16 is connected to the inlet of the low-pressure stage compressor 1; the second outlet of the first three-way valve 3 is connected to the third port of the four-way valve 16, and the fourth port of the four-way valve 16 is connected to the second outlet of the fourth three-way valve 9; the second outlet of the second three-way valve 6 is connected to the inlet of the third expansion valve 19, the outlet of the third expansion valve 19 is connected to the first inlet of the eighth three-way valve 18, the outlet of the eighth three-way valve 18 is connected to the first inlet of the fourth heat exchanger 17, and the first outlet of the fourth heat exchanger 17 is connected to the second inlet of the seventh three-way valve 15; the second outlet of the third three-way valve 8... The outlet end is connected to the second inlet end of the sixth three-way valve 14; the second outlet end of the fifth three-way valve 12 is connected to the second inlet end of the eighth three-way valve 18; the second inlet end of the first heat exchanger is connected to the clean water source 26, and the second outlet end of the first heat exchanger is connected to the insulated water tank 27; the second inlet end of the third heat exchanger 13 is connected to the bath wastewater end, and the second outlet end of the third heat exchanger 13 is connected to the sewage recycling treatment tank; the second inlet end of the fourth heat exchanger 17 is connected to the outlet end of the PV / T module 22, and the second outlet end of the fourth heat exchanger 17 is connected to the inlet end of the PV / T module 22.

[0027] Secondly, a four-way reversing valve is used to switch between winter and summer operating modes. In winter, it simultaneously provides domestic hot water and low-temperature indoor heating, while in summer, it simultaneously meets the needs for domestic hot water and indoor cooling. When solar energy is abundant, in winter operation, the low-pressure stage compressor 1 and the high-pressure stage compressor 4 compress the refrigerant to a high-temperature and high-pressure state. The first heat exchanger condenses the refrigerant and produces high-temperature domestic hot water. The condensed refrigerant liquid passes through the second three-way valve 6. Part of it passes through the first expansion valve 7 to reduce the pressure to the pressure in the second heat exchanger 10, and then passes through the fourth three-way valve 9 to enter the second heat exchanger 10 for condensation and to produce medium-temperature hot water for low-temperature indoor heating. The other part passes through the third expansion valve 19 to enter the fourth heat exchanger 17 to evaporate and absorb heat from the PV / T module 22. When solar energy is abundant, in summer operation, the refrigerant is compressed to a high-temperature, high-pressure state using low-pressure stage compressor 1 and high-pressure stage compressor 4. The refrigerant is condensed in the first heat exchanger to produce high-temperature domestic hot water. The condensed refrigerant liquid passes through the second three-way valve 6, and part of it passes through the first expansion valve 7 to reduce pressure, then through the third three-way valve 8 and the sixth three-way valve 14 to enter the third heat exchanger 13 for condensation. Afterwards, the refrigerant is throttled to a low-temperature, low-pressure state using the second expansion valve 11, and evaporates in the second heat exchanger 10 to produce low-temperature chilled water for indoor cooling; another part passes through the third expansion valve 19 to enter the fourth heat exchanger 17 to evaporate and absorb heat from the PV / T module 22. When solar energy is insufficient, the system can operate normally as a single sewage source heat pump.

[0028] Finally, the system is directly driven by a solar photovoltaic system, requiring no grid connection, is portable, and is equipped with a battery 23 to store additional electrical energy for emergencies. Furthermore, the fourth heat exchanger 17 is connected to the solar PV / T module 22, absorbing heat as a heat pump source and simultaneously cooling the PV / T module 22, extending its lifespan. The third heat exchanger 13 exchanges heat with bath wastewater; since bath wastewater is generally at a higher temperature, the heating effect is better and power consumption is lower. Simultaneously, by regulating the refrigerant flow into the first and second heat exchangers 10 through the first three-way valve 3, dynamic and precise adjustment of the cooling capacity in different temperature zones can be achieved.

[0029] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A solar photovoltaic direct drive based heating-cooling-hot water system, characterized in that, The system comprises a heating-cooling-hot water system and a solar photovoltaic electronic system; The heating-cooling-hot water system comprises a PV / T assembly (22), a compressor, a cooler (2), a three-way valve, a four-way valve (16), an expansion valve, a heat exchanger and pipes for connection through which a refrigerant working medium flows in the system; The compressor comprises a low-pressure stage compressor (1) and a high-pressure stage compressor (4); the heat exchanger comprises a first heat exchanger (5), a second heat exchanger (10), a third heat exchanger (13) and a fourth heat exchanger (17); the three-way valve and the expansion valve are each provided with multiple pipes for connection; The solar photovoltaic electronic system comprises a photovoltaic assembly, a photovoltaic controller (24), an inverter (25) and a storage battery (23); the photovoltaic assembly is provided with multiple assemblies and is integrated on the PV / T assembly (22); the electric energy output by the PV / T assembly (22) is stored in the storage battery (23) through the photovoltaic controller (24); the direct current output at the outlet of the photovoltaic controller (24) is supplied to the power supply ends of the low-pressure stage compressor (1), the high-pressure stage compressor (4) and a direct current water pump (20); The low-pressure stage compressor (1) is connected to the inlet end of the high-pressure stage compressor (4) through the cooler (2); The refrigerant working medium is compressed to a high-temperature and high-pressure state through the two-stage compressor; the outlet end of the high-pressure stage compressor (4) is connected to the first inlet end of the first heat exchanger (5); the second inlet of the first heat exchanger (5) is connected to a water source and the second outlet is connected to a heat preservation water tank (27); the water source is used to condense the refrigerant working medium to generate high-temperature domestic hot water and store the hot water in the heat preservation water tank (27); The first outlet of the first heat exchanger (5) is divided into two branches through the three-way valve, one branch is connected to the inlet end of the second heat exchanger (10) through an expansion valve, the refrigerant working medium exchanges heat in the second heat exchanger (10) to generate medium-temperature hot water; the other branch is connected to the first inlet end of the fourth heat exchanger (17) through an expansion valve; the outlet end of the second heat exchanger (10) is connected to the first inlet end of the third heat exchanger (13); the first outlet end of the third heat exchanger (13) is connected to the inlet end of the low-pressure stage compressor (1) to form a refrigerant working medium circulation; the second inlet end of the third heat exchanger (13) is connected to a bathing wastewater end and the second outlet end is connected to a sewage recycling treatment pool, the refrigerant working medium absorbs heat from the sewage; The second inlet end of the fourth heat exchanger (17) is connected to the outlet end of the PV / T assembly (22) and the second outlet end is connected to the inlet end of the PV / T assembly (22), the fourth heat exchanger (17) absorbs heat as a heat pump heat source to cool the PV / T assembly (22).

2. The solar photovoltaic direct drive circulating heating-cooling-hot water system according to claim 1, characterized in that, The three-way valve is provided with multiple three-way valves, i.e., a first three-way valve (3), a second three-way valve (6), a third three-way valve (8), a fourth three-way valve (9), a fifth three-way valve (12), a sixth three-way valve (14), a seventh three-way valve (15) and an eighth three-way valve (18); the expansion valve is provided with multiple expansion valves, i.e., a first expansion valve (7), a second expansion valve (11) and a third expansion valve (19). The first inlet end of the first three-way valve (3) is connected with the outlet end of the cooler (2), and the first outlet end of the first three-way valve (3) is connected with the inlet end of the high-pressure stage compressor (4); the second outlet end of the first three-way valve (3) is connected with the third port of the four-way valve (16), and the fourth port of the four-way valve (16) is connected with the second outlet end of the fourth three-way valve (9); the outlet end of the seventh three-way valve (15) is connected with the first port of the four-way valve (16), and the second port of the four-way valve (16) is connected with the inlet end of the low-pressure stage compressor (1); the four-way valve (16) switches the pipelines participating in the refrigerant working medium cycle.

3. The solar photovoltaic direct drive based heating-cooling-hot water system according to claim 2, characterized in that, The inlet end of the second three-way valve (6) is connected with the first outlet end of the first heat exchanger (5), and the first outlet end of the second three-way valve (6) is connected with the inlet end of the first expansion valve (7); the second outlet of the second three-way valve (6) is connected with the inlet end of the third expansion valve (19), the outlet end of the third expansion valve (19) is connected with the first inlet end of the eighth three-way valve (18), the outlet end of the eighth three-way valve (18) is connected with the first inlet end of the fourth heat exchanger (17), and the first outlet end of the fourth heat exchanger (17) is connected with the second inlet end of the seventh three-way valve (15); The outlet end of the first expansion valve (7) is connected with the inlet end of the third three-way valve (8), the first outlet of the third three-way valve (8) is connected with the first inlet end of the fourth three-way valve (9), the outlet end of the fourth three-way valve (9) is connected with the inlet end of the second heat exchanger (10), the inlet end of the second expansion valve (11) is connected with the outlet end of the second heat exchanger (10), the outlet end of the second expansion valve (11) is connected with the inlet end of the fifth three-way valve (12), the first outlet end of the fifth three-way valve (12) is connected with the first inlet end of the third heat exchanger (13), the first outlet end of the third heat exchanger (13) is connected with the first inlet end of the sixth three-way valve (14), and the outlet end of the sixth three-way valve (14) is connected with the first inlet end of the seventh three-way valve (15).

4. The solar photovoltaic direct drive circulating heating-cooling-hot water system according to claim 1, characterized in that, The temperature of the high-temperature domestic hot water is 50-60 degrees Celsius, and the temperature of the medium-temperature hot water is 30-35 degrees Celsius.

5. The solar photovoltaic direct drive based heating-cooling-hot water system according to claim 3, wherein, In winter, the low-pressure stage compressor (1) and the high-pressure stage compressor (4) compress the refrigerant working medium to a high-temperature and high-pressure state; the first heat exchanger (5) exchanges heat with the refrigerant working medium to supply hot water; the refrigerant working medium passes through the second three-way valve (6), part of which is reduced in pressure by the first expansion valve (7) to the pressure in the second heat exchanger (10), and enters the second heat exchanger (10) through the fourth three-way valve (9) to exchange heat with the refrigerant working medium for heating.

6. The solar photovoltaic direct drive based heating-cooling-hot water system according to claim 3, wherein, In summer, the low-pressure stage compressor (1) and the high-pressure stage compressor (4) compress the refrigerant working medium to a high-temperature and high-pressure state; the first heat exchanger (5) exchanges heat with the refrigerant working medium to supply hot water; the refrigerant working medium passes through the second three-way valve (6), part of which is reduced in pressure by the first expansion valve (7), enters the third heat exchanger (13) through the third three-way valve (8) and the sixth three-way valve (14) to condense, then the second expansion valve (11) throttles the refrigerant to a low-temperature and low-pressure state, and evaporates in the second heat exchanger (10) to produce low-temperature chilled water for cooling.

7. The solar photovoltaic direct drive based heating-cooling-hot water system according to claim 1, wherein, The system can run normally as a single sewage source heat pump when the solar energy is insufficient.

8. The solar photovoltaic direct drive based heating-cooling-hot water system according to claim 7, characterized in that, The power consumption of the heat pump system is directly driven by the solar photovoltaic system, without the need to access the power grid.

9. The solar photovoltaic direct drive based heating-cooling-hot water system according to claim 1, wherein, The first three-way valve (3) adjusts the flow of refrigerant working medium into the first heat exchanger (5) and the second heat exchanger (10), accurately controlling the temperature.

10. The solar photovoltaic direct drive based heating-cooling-hot water system according to claim 1, wherein, The mains power is connected to the photovoltaic controller (24) through the inverter (25) for auxiliary power supply.

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