Phase change fluorine pump heating system and control method thereof

Abstract

The present disclosure provides a phase change fluorine pump heating system and a control method thereof, which comprises a fluorine pump, a phase change material-containing heat exchanger module, an indoor heat exchanger, an outdoor heat exchanger, an outdoor all-in-one machine, a one-way valve, an electrical control valve, a three-way valve, a power storage module, a filter, an electronic expansion valve and a solar photovoltaic panel, etc. In the winter sunlight sufficient operation condition, the solar photovoltaic-thermal system can store heat for the phase change material-containing heat exchanger module and send it to the indoor heat exchanger for heat exchange through the fluorine pump, which can realize multi-connected heating and phase change material heat storage. In the winter sunlight insufficient condition, the solar photovoltaic system provides power for the compressor and the fluorine pump, the phase change material stores heat and then defrosts the outdoor unit, so that the compressor heating cycle is more efficient.

Description

Technical Field

[0001] This disclosure relates to the field of heating, ventilation and air conditioning (HVAC) technology, and in particular to a phase change fluorine pump heating system and its control method. Background Technology

[0002] In numerous fields such as building heating, data center temperature control, and industrial production temperature control, heating systems are core infrastructures ensuring the normal operation of production and daily life, and their energy consumption accounts for a consistently high proportion of total social energy consumption. With the advancement of global "dual carbon" goals and the continuous rise in energy prices, the problems of high energy consumption and low efficiency of traditional heating systems are becoming increasingly prominent, urgently requiring the development of new heating technologies that combine energy efficiency, stability, and adaptability.

[0003] Currently, among the mainstream heating systems on the market, the traditional refrigerant pump heating system is one of the most widely used energy-saving solutions. This system uses refrigerant as the heat transfer medium, and the core relies on the refrigerant pump to provide circulation power, eliminating the need for a compressor. The energy-saving logic lies in replacing the high-energy-consuming work of the compressor with the low-power operation of the refrigerant pump. During transitional seasons, the system can extract natural cold sources or low-grade heat energy from the outside to drive the refrigerant to circulate and exchange heat between indoor and outdoor heat exchangers, achieving gentle heating. However, the structure and working principle of this system result in shortcomings at low temperatures in winter: First, when the outdoor temperature is below 0°C, the refrigerant evaporation efficiency drops sharply, and the refrigerant pump's driving force is insufficient to increase the refrigerant temperature and pressure like a compressor, leading to a sharp reduction in effective indoor heating. High-power electric heating is required to supplement the heating, resulting in the loss of energy-saving advantages and a rebound in energy consumption. Second, at low temperatures, the surface of the outdoor heat exchanger is prone to frost formation. The frost layer hinders heat exchange and exacerbates the heating attenuation. Manual defrosting requires shutdown, which is time-consuming, laborious, and interrupts heating. Electric defrosting consumes additional energy and causes a sharp drop in heating, making it difficult to meet the continuous and stable heating needs in winter.

[0004] Phase change energy storage technology has garnered significant attention in the heating sector in recent years due to its ability to achieve intertemporal air conditioning and efficient utilization of energy. Phase change materials can store and release energy by absorbing or releasing latent heat within a specific temperature range. If this technology can be organically combined with refrigerant pump systems and integrated with clean energy utilization, it is expected to overcome the performance deficiencies of traditional refrigerant pump heating systems under extreme conditions. For example, in winter, phase change materials can be used to store solar thermal energy or heat generated during off-peak hours, which can then be efficiently delivered to the heating terminals during the day via a refrigerant pump system, ensuring continuous and stable heating.

[0005] Currently, although some solutions attempt to combine phase change technology with fluorine pump heating systems, they generally suffer from several shortcomings: First, the system integration is low, and the matching between phase change materials and fluorine pump systems is poor. Most solutions are simply a superposition of phase change devices and fluorine pump systems, failing to achieve dynamic coupling of flow and pressure between phase change heat storage and fluorine pump circulation, resulting in limited improvement in heating energy efficiency. Second, they do not integrate solar photovoltaic and solar thermal integration design. Existing solar heating solutions mostly focus only on the single function of solar thermal utilization or photovoltaic power generation, failing to achieve a synergistic design of "photovoltaic power generation and energy storage + solar thermal collection and storage," thus limiting the effectiveness of solar energy. First, the heat resources are not fully integrated for heating, and the coupling depth with the fluorine pump and phase change material is insufficient. It is impossible to provide power for the fluorine pump heating cycle through the energy storage module, and it is also impossible to efficiently store solar heat through the phase change material, resulting in a waste of clean energy. Second, the control strategy is simple and lacks a dynamic control strategy based on multiple parameters such as ambient temperature, terminal heating load, phase change material heat storage status, and solar radiation intensity. It is impossible to realize intelligent switching of heating operation mode and it is difficult to adapt to complex heating conditions such as "sufficient sunshine heating, weak sunshine heating, no sunshine heating, and off-peak electricity heating + defrosting at night".

[0006] Therefore, in response to the problems of insufficient heating, high defrosting energy consumption and heating interruption in traditional fluorine pump heating systems during winter, as well as the shortcomings of existing phase change and fluorine pump combined heating systems such as low integration, poor coordination, low clean energy utilization and imprecise control, it is hoped to develop a new type of heating system that deeply integrates solar photovoltaic thermal energy, phase change energy storage and fluorine pump circulation, and has the ability to intelligently switch between multiple modes, so as to achieve the integrated heating goal of "energy saving, stable heating and efficient defrosting", and adapt to the heating needs under different sunshine and temperature conditions. Summary of the Invention

[0007] The purpose of this disclosure is to provide a phase change fluorine pump heating system and its control method to address the aforementioned problems. The phase change fluorine pump heating system has four core modes: solar thermal storage heating mode, solar thermal storage defrosting mode, phase change module heating mode, and electric auxiliary defrosting mode. It has the advantages of strong power supply continuity and flexible energy regulation, and can be widely adapted to various working conditions such as conventional use, low temperature defrosting, and energy utilization.

[0008] This disclosure provides a phase change refrigerant pump heating system, including a first on / off valve 1, a second on / off valve 2, a first indoor heat exchanger 3, a second indoor heat exchanger 4, a fourth three-way valve 5, a first three-way valve 6, an outdoor heat exchanger 7, a fourth electronic expansion valve 8, a heat exchanger module 10 containing phase change material 9, a compressor 11, a second electronic expansion valve 12, a first electronic expansion valve 13, a first filter 14, an eighth on / off valve 15, a first liquid storage tank 16, an energy storage module 17, a solar photovoltaic panel 18, a second electrical control valve 19, a third electrical control valve 20, and a second liquid storage tank 21. The system includes: a second fluorine pump 22, an eleventh-way shut-off valve 23, a third electronic expansion valve 24, a first electrical control valve 25, a seventh-way shut-off valve 26, a second three-way valve 27, a sixth-way shut-off valve 28, a fifth-way shut-off valve 29, a fourth-way shut-off valve 30, a third-way shut-off valve 31, a sixth three-way valve 32, a third check valve 33, a fifth three-way valve 34, a second check valve 35, a first fluorine pump 36, a first check valve 37, a ninth-way shut-off valve 39, a second filter 40, a tenth-way shut-off valve 41, a twelfth-way shut-off valve 42, an outdoor integrated unit 43, a third three-way valve 46, and a solar thermal collector 47. The outdoor unit 43 includes a heat exchanger module 10 and an outdoor heat exchanger 7. A solar photovoltaic panel 18 is installed on a solar collector 47. The solar photovoltaic panel 18 is electrically connected to a storage module 17. The storage module 17 is electrically connected to a first refrigerant pump 36, and its power supply circuit is controlled by a first electrical control valve 25. The storage module 17 is electrically connected to a second refrigerant pump 22, and its power supply circuit is controlled by a second electrical control valve 19. The second refrigerant pump 22 is electrically connected to the compressor 11, and its power supply circuit is controlled by the third electrical control valve 20. The second refrigerant pump 22 is also connected to the compressor 11 in sequence through the third check valve 33, the second on / off valve 2, the third on / off valve 31, and the sixth three-way valve 32. The second refrigerant pump 22 is connected to the first liquid storage tank 16 in sequence through the third check valve 33, the second on / off valve 2, the fifth on / off valve 29, and the sixth on / off valve 28. The second refrigerant pump 22 is connected to the heat exchanger module 10 in sequence through the third check valve 33, the second on / off valve 2, and the fourth on / off valve 30. The second refrigerant pump 22 is also connected to the first refrigerant pump 36 in sequence through the third check valve 33, the second on / off valve 2, the fifth on / off valve 29, the first on / off valve 1, the fifth three-way valve 34, and the seventh on / off valve 26. The first liquid storage tank 16 is connected to the first indoor heat exchanger 3 and the second indoor heat exchanger 4 in sequence through the first one-way valve 37, the eighth shut-off valve 15 and the fourth three-way valve 5. The first liquid storage tank 16 is also connected to the first indoor heat exchanger 3 and the second indoor heat exchanger 4 in sequence through the first one-way valve 37, the first fluorine pump 36, the second one-way valve 35 and the fourth three-way valve 5. The compressor 11 is connected to the outdoor heat exchanger 7. The outdoor heat exchanger 7 is connected to the second indoor heat exchanger 4 in sequence through the fourth electronic expansion valve 8, the ninth on / off valve 39, the first three-way valve 6, and the second electronic expansion valve 12. The outdoor heat exchanger 7 is connected to the first indoor heat exchanger 3 in sequence through the fourth electronic expansion valve 8, the ninth on / off valve 39, the first three-way valve 6, and the first electronic expansion valve 13. The first indoor heat exchanger 3 is connected to the first filter 14 in sequence through the first electronic expansion valve 13, the first three-way valve 6 and the tenth shut-off valve 41; the second indoor heat exchanger 4 is connected to the first filter 14 in sequence through the second electronic expansion valve 12, the first three-way valve 6 and the tenth shut-off valve 41. The first filter 14 is connected to the heat exchanger module 10 in sequence through the second three-way valve 27 and the third electronic expansion valve 24. The first filter 14 is connected to the outdoor heat exchanger 7 in sequence through the second three-way valve 27, the eleventh shut-off valve 23, the third three-way valve 46, the twelfth shut-off valve 42 and the fourth electronic expansion valve 8. The first filter 14 is connected to the second filter 40 in sequence through the second three-way valve 27, the eleventh shut-off valve 23 and the third three-way valve 46. The second filter 40 is connected to the second liquid storage tank 21. The second liquid storage tank 21 is connected to the solar collector 47.

[0009] In some embodiments, the phase change fluorine pump heating system is equipped with an electric auxiliary heating device 38 on the side near the outdoor heat exchanger 7.

[0010] In some embodiments, an air inlet 44 is provided above the outdoor unit 43, and an air outlet 45 is provided below the outdoor unit 47.

[0011] This disclosure also provides a control method for a phase change fluorine pump heating system. The phase change fluorine pump heating system includes a solar thermal storage heating mode. In this mode, solar photovoltaic panels 18 generate electricity, which is stored in an energy storage module 17, thereby supplying power to the first fluorine pump 36 and the second fluorine pump 22. Refrigerant flows from the second storage tank 21, passes through a solar collector 47, and enters the second fluorine pump 22. At this time, the first shut-off valve 1, the second shut-off valve 2, the fifth shut-off valve 29, the fourth shut-off valve 30, the tenth shut-off valve 41, the eleventh shut-off valve 23, and the seventh shut-off valve 26 are open, while the third shut-off valve 31, the sixth shut-off valve 28, the eighth shut-off valve 15, the ninth shut-off valve 39, and the twelfth shut-off valve 42 are closed. After flowing to the second shut-off valve 2, the refrigerant splits into two paths: one path flows through the fourth shut-off valve 30 into a heat exchanger module 10 containing phase change material 9. After the refrigerant flows out, it passes through the second three-way valve 27, the eleventh shut-off valve 23, and the third three-way valve 46, flows to the second filter 40, and finally returns to the second liquid storage tank 21, completing one cycle. Another path flows through the fifth shut-off valve 29 into the first shut-off valve 1. After the refrigerant flows out of the fifth three-way valve 34, it flows through the seventh shut-off valve 26 to the first refrigerant pump 36. The refrigerant from the first refrigerant pump 36 flows into the fourth three-way valve 5 and is divided into two paths: one path flows through the second indoor heat exchanger 4 into the second electronic expansion valve 12, and then into the first three-way valve 6; the other path flows through the first indoor heat exchanger 3 into the first electronic expansion valve 13, and then into the first three-way valve 6. The refrigerant in the first three-way valve 6 passes through the first filter 14 and flows sequentially into the second three-way valve 27, the eleventh shut-off valve 23, and the third three-way valve 46. Finally, the refrigerant returns to the second liquid storage tank 21 through the second filter 40.

[0012] In some embodiments, the phase change refrigerant pump heating system includes a solar thermal storage defrosting mode. In this mode, solar photovoltaic panels 18 generate electricity, which is stored in the energy storage module 17, thereby powering the second refrigerant pump 22 and compressor 11 to start them. Refrigerant flows out from the second liquid storage tank 21, passes through the solar collector 47, and enters the second refrigerant pump 22. At this time, the eighth shut-off valve 15, the second shut-off valve 2, the fourth shut-off valve 30, the ninth shut-off valve 39, the seventh shut-off valve 26, and the eleventh shut-off valve 23 are open, while the third shut-off valve 31, the sixth shut-off valve 28, the fifth shut-off valve 29, the tenth shut-off valve 41, the twelfth shut-off valve 42, and the first shut-off valve 1 are closed. One path of refrigerant flows through the third check valve 33 to the second shut-off valve 2, and then through the fourth shut-off valve 30 into a container containing refrigerant. In the heat exchanger module 10 of phase change material 9, after the refrigerant flows out, it passes through the second three-way valve 27, the eleventh shut-off valve 23, and the third three-way valve 46 in sequence, flows to the second filter 40, and finally returns to the second liquid storage tank 21, completing one cycle. In another path, the refrigerant comes out of the compressor 11, passes through the sixth three-way valve 32, the fifth three-way valve 34, the seventh shut-off valve 26, and the eighth shut-off valve 15 into the fourth three-way valve 5, and splits into two paths: one path flows through the second indoor heat exchanger 4 into the second electronic expansion valve 12, and then into the first three-way valve 6; the other path flows through the first indoor heat exchanger 3 into the first electronic expansion valve 13, and then into the first three-way valve 6. After the two refrigerant paths converge in the first three-way valve 6, they flow through the ninth shut-off valve 39 and the fourth electronic expansion valve 8 to the outdoor heat exchanger 7, and return to the compressor 11, completing one cycle.

[0013] In some embodiments, the phase change refrigerant pump heating system includes a phase change module heating mode. In the phase change module heating mode, when the phase change material 9 has sufficient heat storage, the first electrical control valve 25 is opened, and the energy storage module 17 supplies power to the first refrigerant pump 36; the fourth shut-off valve 30, the sixth shut-off valve 28, the fifth shut-off valve 29, and the tenth shut-off valve 41 are opened, and the third shut-off valve 31, the second shut-off valve 2, the first shut-off valve 1, the seventh shut-off valve 26, the ninth shut-off valve 39, the eleventh shut-off valve 23, the eighth shut-off valve 15, and the twelfth shut-off valve 42 are closed, starting the first refrigerant pump 36; refrigerant flows from the first liquid storage tank 16 through the first one-way valve 37 to the first refrigerant pump 36. Pump 36 then flows through the second one-way valve 35 to the fourth three-way valve 5, splitting into two paths: one path flows through the second indoor heat exchanger 4 into the second electronic expansion valve 12, and then into the first three-way valve 6; the other path flows through the first indoor heat exchanger 3 into the first electronic expansion valve 13, and then into the first three-way valve 6; the two refrigerants converge in the first three-way valve 6, first through the tenth shut-off valve 41 and then through the first filter 14 into the second three-way valve 27; then through the third electronic expansion valve 24 into the heat exchanger module 10 containing the phase change material 9, and finally through the fourth shut-off valve 30, the fifth shut-off valve 29 and the sixth shut-off valve 28 back to the first liquid storage tank 16, completing one cycle.

[0014] In some embodiments, the phase change refrigerant pump heating system includes an electric auxiliary defrosting mode. In the electric auxiliary defrosting mode, during nighttime heating operation, the electric auxiliary heating device 38 is turned on. Because the electric auxiliary heating device 38 is close to the outdoor unit heat exchanger, it defrosts the outdoor heat exchanger 7 through the air duct formed by the air inlet and air outlet, and can store heat for the phase change material 9.

[0015] In some embodiments, the phase change fluorine pump heating system uses solar photovoltaic panels 18 to convert solar energy into electrical energy and store it in the energy storage module 17 to provide power to the first fluorine pump 36, the second fluorine pump 22 and the compressor 11. The refrigerant carries the heat to the phase change material 9 through the solar thermal collector 47 for heat storage, thereby achieving heat storage and defrosting.

[0016] In some embodiments, when the phase change material 9 in the heat exchanger module 10 has sufficient heat storage, it provides heating to the room through the first indoor heat exchanger 3 and the second indoor heat exchanger 4.

[0017] In some embodiments, the switching between solar thermal storage heating mode, solar thermal storage defrosting mode, phase change module heating mode, and electric auxiliary defrosting mode is achieved by opening and closing the on / off valve and the electronic expansion valve.

[0018] Due to the adoption of the above technical solution, the beneficial effects of this disclosure are: 1. This invention makes a breakthrough in utilizing solar energy conversion to power the refrigerant pump and compressor with electrical energy, and the converted heat energy is delivered to the room for heating via refrigerant, while the other part is stored in phase change material, thus achieving full utilization of solar energy and the refrigerant pump system. 2. This disclosure utilizes phase change material within the heat exchanger to store energy and maintain a stable heating temperature, thereby reducing energy storage and forming a thermal buffer, and preparing for subsequent indoor heating via refrigerant. The heat stored in the phase change material can also be used for defrosting the outdoor heat exchanger during operation. 3. This disclosure controls the direction and flow rate of refrigerant in the channel by setting multiple on / off valves, electronic expansion valves and check valves, so as to realize the conversion of four core modes, effectively meet the different heat demand of indoor units and the defrosting of outdoor units under different operating conditions, and make full use of heat energy and reduce heat energy waste. 4. This disclosure utilizes the advantage of low electricity prices to defrost the outdoor heat exchanger by installing an electric auxiliary heating device on the outside of the outdoor heat exchanger during winter nighttime operation. Attached Figure Description

[0019] This disclosure will be illustrated by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the phase change fluorine pump heating system disclosed herein; Figure 2 This is a schematic diagram of the first embodiment of the present disclosure; Figure 3 This is a schematic diagram of the second embodiment of the present disclosure; Figure 4 This is a schematic diagram of the third embodiment of the present disclosure; Figure 5 This is a schematic diagram of the fourth embodiment of the present disclosure.

[0020] Reference numerals: 1-First on / off valve, 2-Second on / off valve, 3-First indoor heat exchanger, 4-Second indoor heat exchanger, 5-Fourth three-way valve, 6-First three-way valve, 7-Outdoor heat exchanger, 8-Fourth electronic expansion valve, 9-Phase change material, 10-Heat exchanger module containing phase change material, 11-Compressor, 12-Second electronic expansion valve, 13-First electronic expansion valve, 14-First filter, 15-Eighth on / off valve, 16-First liquid storage tank, 17-Electric energy storage module, 18-Solar photovoltaic panel, 19-Second electrical control valve, 20-Third electrical control valve, 2 1-Second liquid storage tank, 22-Second fluorine pump, 23-Eleventh shut-off valve, 24-Third electronic expansion valve, 25-First electrical control valve, 26-Seventh shut-off valve, 27-Second three-way valve, 28-Sixth shut-off valve, 29-Fifth shut-off valve, 30-Fourth shut-off valve, 31-Third shut-off valve, 32-Sixth three-way valve, 33-Third check valve, 34-Fifth three-way valve, 35-Second check valve, 36-First fluorine pump, 37-First check valve, 38-Electric auxiliary heating device, 39-Ninth shut-off valve, 40-Second filter, 41-Tenth shut-off valve, 42-Twelfth shut-off valve, 43-Outdoor integrated unit, 44-Air inlet, 45-Air outlet, 46-Third three-way valve, 47-Solar thermal collector. Detailed Implementation

[0021] In the description of this specification, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this specification.

[0022] Furthermore, the use of terms such as "horizontal" or "vertical" in this specification does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of this specification, it should also be noted that, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” should be interpreted broadly. For example, a link can be a fixed link, a detachable link, or an integral link; it can be a mechanical link or an electrical link; it can be a direct link or an indirect link through an intermediate medium; it can be a connection within two components.

[0024] Figure 1 This is a schematic diagram of the phase change fluorine pump heating system disclosed herein; Figure 2 This is a schematic diagram of the first embodiment of the present disclosure; Figure 3 This is a schematic diagram of the second embodiment of the present disclosure; Figure 4 This is a schematic diagram of the third embodiment of the present disclosure; Figure 5 This is a schematic diagram of the fourth embodiment of this disclosure. Figures 2 to 5 In the image, the fluid's path is highlighted with thick lines. Example 1

[0025] like Figure 1 and Figure 2As shown, the solar thermal storage heating mode includes: solar photovoltaic power generation is stored in the energy storage module 17, which is in a fully charged standby state, thereby providing stable operating power to the first refrigerant pump 36 and the second refrigerant pump 22; low-temperature and low-pressure liquid refrigerant flows out from the bottom of the second liquid storage tank 21, absorbs solar radiation heat from the environment through the solar thermal collector 47, and is heated to a medium temperature before entering the second refrigerant pump 22; at this time, each on / off valve is precisely switched on and off by electromagnetic control: the valve cores of the first on / off valve 1, the second on / off valve 2, the fifth on / off valve 29, the fourth on / off valve 30, the tenth on / off valve 41, the eleventh on / off valve 23, and the seventh on / off valve 26 are fully open. When opened, the valve cores of the third shut-off valve 31, the sixth shut-off valve 28, the eighth shut-off valve 15, the ninth shut-off valve 39, and the twelfth shut-off valve 42 are tightly closed, cutting off the refrigerant flow in this branch. The refrigerant flows to the second shut-off valve 2 and splits into two paths: one path flows through the unobstructed pipeline of the fourth shut-off valve 30 into the phase change material heat exchanger module 10, where it exchanges heat with the internal phase change material 9 and releases some heat. The refrigerant then flows out of the module 10, guided by the valve core of the second three-way valve 27, and flows through the eleventh shut-off valve 23 and the third three-way valve 46 to the second filter 40 (to filter out impurities that may be mixed in during the circulation), and finally returns to the bottom of the second liquid storage tank 21. One path completes a small cycle; the other path flows through the passage of the fifth shut-off valve 29 into the first shut-off valve 1. After the refrigerant flows out of the fifth three-way valve 34 for diversion and regulation, it flows through the guide pipe of the seventh shut-off valve 26 to the first refrigerant pump 36 (the first refrigerant pump 36 pressurizes the refrigerant to the working pressure after starting). The pressurized first refrigerant pump 36 sends the medium-temperature and high-pressure refrigerant into the fourth three-way valve 5, and splits it into two paths: one path releases heat into the room through the second indoor heat exchanger 4, cools down to a low-temperature liquid state, and then flows into the second electronic expansion valve 12 (the second electronic expansion valve 12 performs throttling and pressure reduction, adjusting the refrigerant to a low-pressure gas-liquid mixture state), and then enters the first three-way valve 6. The other refrigerant releases heat into the room through the first indoor heat exchanger 3, cools down to a low-temperature liquid state, and then flows into the first electronic expansion valve 13 (the first electronic expansion valve 13 simultaneously throttles and reduces pressure to maintain a consistent medium state), and then enters the first three-way valve 6; the two refrigerants are fully mixed in the first three-way valve 6 to form a stable flow of low-temperature, low-pressure refrigerant, which, after secondary filtration by the first filter 14, flows sequentially into the unobstructed pipelines of the second three-way valve 27 (completing the path switching), the eleventh shut-off valve 23, and the third three-way valve 46; finally, after the refrigerant is purified again by the second filter 40, it flows smoothly back to the top of the second liquid storage tank 21, completing the entire cycle process. Example 2

[0026] like Figure 1 and Figure 3As shown, the solar thermal defrosting mode includes: during cloudy or snowy winter days or short-day periods with less than 4 hours of sunshine, when the solar irradiance is only about 25% of the rated value, the solar photovoltaic panel 18 converts the weak light energy into low-voltage DC power, which is temporarily stored in the lithium-ion energy storage unit of the energy storage module 17 to ensure low-load operation of the equipment, thereby providing circulating power for the second fluorine pump 22 and starting power for the compressor 11; subsequently, the second fluorine pump 22 first enters a 15-second pre-run to check for pipeline blockages and establish initial pressure, and the compressor 11 completes the pre-filling of lubricating oil. After looping, it starts smoothly at a low load of 25%; the low-temperature, low-pressure liquid refrigerant slowly flows out from the outlet at the bottom of the second liquid storage tank 21, and after being heated to 4-6℃ by the solar thermal collector 47, it enters the inlet chamber of the second refrigerant pump 22; at this time, the electric control valve group precisely controls the opening and closing status: the solenoid valve cores of the eighth shut-off valve 15, the second shut-off valve 2, the fourth shut-off valve 30, the ninth shut-off valve 39, the seventh shut-off valve 26, and the eleventh shut-off valve 23 are fully engaged, and the valve ports are 100% fully open; the third shut-off valve 31, the sixth shut-off valve 28, and the tenth shut-off valve... The valve cores of shut-off valves 41, 42, 29, and 1 are de-energized and reset, resulting in tight valve closure. One path of refrigerant, propelled by the second refrigerant pump 22, passes through the third check valve 33. The valve core is opened unidirectionally by the medium's thrust, allowing only forward flow of refrigerant to prevent backflow from interfering with the main circulation pressure. The refrigerant flows to the fully open second shut-off valve 2, and then through the unobstructed pipeline of the fourth shut-off valve 30, into the phase change material heat exchanger module 10, where it interacts with the previously stored residual heat in the phase change material 9 (temperature approximately 22-25°C). After heat exchange, the refrigerant temperature rises to 10-13℃ and flows out of module 10 in a medium-temperature, low-pressure liquid state. Then, it flows sequentially through the second three-way valve 27, the eleventh shut-off valve 23, and the third three-way valve 46 to the second filter 40, where trace amounts of phase change material debris and pipeline oxidation impurities mixed in during the circulation are filtered out. Finally, it flows back to the inlet of the second liquid storage tank 21 in a clean, low-temperature liquid state, completing the "heat storage-circulation" process of this branch. In the other branch, the compressor 11 compresses the drawn-in low-temperature, low-pressure gaseous refrigerant to 115-125℃ and 2.8-3.The high-temperature, high-pressure gaseous refrigerant (0MPa) is discharged from the exhaust port, passes through the sixth three-way valve 32 and the fifth three-way valve 34, and then through the fully open seventh shut-off valve 26 and the eighth shut-off valve 15, flowing unimpeded into the manifold of the fourth three-way valve 5. Here, the high-temperature, high-pressure refrigerant is divided into two paths: one path flows into the second indoor heat exchanger 4, releasing heat into the room through the fins to maintain the indoor base temperature at no less than 17℃. After the temperature drops to 48-52℃, it becomes a medium-temperature, high-pressure liquid, then flows into the second electronic expansion valve 12. The valve core opening is precisely adjusted to 28%, throttling and depressurizing the medium to a low-temperature, low-pressure gas-liquid mixture of 18-22℃, before entering the side port of the first three-way valve 6; the other path flows into the first indoor heat exchanger 3. Simultaneously, heat is released into the room, and after cooling to 50-54℃, it becomes a medium-temperature, high-pressure liquid, flowing into the first electronic expansion valve 13. The two low-temperature, low-pressure gas-liquid mixtures are fully mixed in the first three-way valve 6, and then flow into the fourth electronic expansion valve 8 through the fully open ninth shut-off valve 39. The valve core opening is finely adjusted to 22% to further optimize the gas-liquid ratio of the medium. It then flows to the outdoor heat exchanger 7, where the residual heat carried by the refrigerant gradually melts the 2-4mm thick frost layer on the surface of the heat exchanger. After the frost melts, it is discharged as liquid water along the guide channel, while its own temperature drops to 3-5℃. Finally, it returns to the suction port of the compressor 11 in a low-temperature, low-pressure gaseous state, completing the main cycle of "compression-heat release-defrosting". Example 3

[0027] like Figure 1 and Figure 4As shown, the phase change module heating mode includes: when the phase change material 9 in the phase change material heat exchanger module 10 has sufficient heat storage, the temperature rises to 35-40℃, and the heat storage reaches more than 90% of the rated value, the system temperature control sensor triggers a command, and the solenoid valve core of the first electrical control valve 25 is attracted and opened; at the same time, the energy storage module 17 outputs stable DC power to provide working power for the first fluorine pump 36, and the fluorine pump enters the pre-start pressure self-test stage; subsequently, the electrical control valve group accurately executes the opening and closing commands: the valve discs of the fourth shut-off valve 30, the sixth shut-off valve 28, the fifth shut-off valve 29, and the tenth shut-off valve 41 are fully raised, and the passage is 100% unobstructed; the third shut-off valve 3... 1. The valve discs of the second shut-off valve 2, the first shut-off valve 1, the seventh shut-off valve 26, the ninth shut-off valve 39, the eleventh shut-off valve 23, the eighth shut-off valve 15, and the twelfth shut-off valve 42 are tightly fitted to the valve seats, completely cutting off the passage. After the command is confirmed to be correct, the first refrigerant pump 36 is officially started at 70% of its rated power. The low-temperature, low-pressure liquid refrigerant, with a temperature of about 5-8℃ and a pressure of 0.4MPa, flows smoothly from the outlet of the first liquid storage tank 16, flows through the second one-way valve 37 to the inlet of the first refrigerant pump 36. After the refrigerant pump starts running, it pressurizes the refrigerant to 1.2-1.5MPa, and then flows steadily through the first one-way valve 35 to the fourth three-way valve 5. The refrigerant flows into the first three-way valve 6 and splits into two streams: one stream flows into the second indoor heat exchanger 4, releasing heat into the room through the fins to maintain the indoor temperature at 20-22℃. After the temperature drops to 25-28℃, it becomes a medium-temperature, high-pressure liquid and then flows into the second electronic expansion valve 12. The valve core opening is adjusted to 35%, throttling and depressurizing the medium to a low-temperature, low-pressure gas-liquid mixture at 10-12℃, before entering the side port of the first three-way valve 6. The other stream flows into the first indoor heat exchanger 3, simultaneously releasing heat into the room. After the temperature drops to 26-29℃, it becomes a medium-temperature, high-pressure liquid and flows into the first electronic expansion valve 13. The two low-temperature, low-pressure gas-liquid mixtures of refrigerant flow into the first three-way valve 6. The refrigerant flows through the fully open tenth shut-off valve 41, then through the first filter 14, and into the second three-way valve 27. Subsequently, it flows through the third electronic expansion valve 24, with the valve core opening finely adjusted to 30% to optimize the gas-liquid ratio of the medium. It then flows to the phase change material heat exchanger module 10 to exchange heat with the internally sufficient heat-storing phase change material 9. After absorbing the heat released by the phase change material, the refrigerant temperature rises to 20-23℃. Finally, it flows through the unobstructed pipelines of the fourth shut-off valve 30, the fifth shut-off valve 29, and the sixth shut-off valve 28 in sequence, returning to the inlet of the first liquid storage tank 16 in a medium-temperature, low-pressure gaseous state, completing the "phase change heat release indoor heating" cycle. Example 4

[0028] like Figure 1 and Figure 5As shown, the electric auxiliary heating defrosting mode includes: From 22:00 to 6:00 the next day, which is the off-peak electricity period, the electricity price is only 30% of the daytime peak price, making it ideal for low-cost equipment operation. At this time, the outdoor temperature drops to -3℃ to -1℃, and 4-6mm thick frost has formed on the fins of the outdoor heat exchanger 7, severely affecting heat exchange efficiency. Taking advantage of the low electricity price, the electric auxiliary heating device 38, which is closely attached to the outside of the fins of the phase change material heat exchanger 10, is turned on. This device uses a positive temperature coefficient (PTC) ceramic heating module with a rated power of 1.8kW, and a 5cm wide air duct space is intentionally left between its outer shell and the heat exchanger fins.

[0029] Once the electric auxiliary heating device 38 is activated, its built-in miniature centrifugal fan also starts spinning: the air inlet draws in cold air from the outside, the airflow is heated to 45℃~50℃ by the PTC module, and then steadily blows onto the heat exchanger fins through the closed air duct formed by the directional air guide plate. The hot airflow first softens the surface of the frost layer, and then slowly seeps into the interior of the frost layer, quickly melting it into water. The melted water gathers along the inclined guide groove at the bottom of the heat exchanger and flows through the drain pipe to the outdoor drain outlet, thus completing the defrosting of the outdoor heat exchanger.

[0030] Some of the residual heat from defrosting is transferred through the fins to the pipes inside the heat exchanger, where it is absorbed by the low-temperature refrigerant. The refrigerant temperature rises slightly to 8°C~10°C, and then it is piped to the heat exchanger module 10 containing phase change material (PCM), where it exchanges heat with PCM 9. The PCM 9, initially solid, absorbs heat and slowly liquefies, storing the heat and raising its temperature to 25°C~28°C – essentially storing the residual heat from defrosting a second time within the PCM, making it economical and practical.

[0031] The technical solution disclosed herein has at least the following advantages: (1) Under the condition of sufficient sunlight in winter, the solar photovoltaic system can store heat for the heat exchanger module containing phase change material and send it to the indoor heat exchanger through the fluorine pump for heat exchange, which can realize the heating of multi-unit heating and heat storage of phase change material; (2) Under the condition of insufficient sunlight in winter, the solar photovoltaic system provides electricity for the compressor and fluorine pump, and the phase change material stores heat to defrost the outdoor unit, making the compressor heating cycle more efficient; (3) In the phase change material heating mode, the characteristics of phase change material are used to exchange heat for the indoor heat exchanger, so as to provide more sufficient and economical heating; (4) In the case of night heating, the off-peak electricity price is used to provide electric auxiliary heating for defrosting the outdoor unit heat exchanger; (5) This disclosure enables the fluorine pump to maintain a constant heating effect in extreme weather and defrosting operation mode, and improves the reliability of the system.

[0032] Example embodiments have been disclosed herein, and while specific terminology has been used, it is for illustrative purposes only and should be construed as such, and is not intended to be limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in connection with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in connection with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of this disclosure as set forth by the appended claims.

Claims

1. A phase change fluorine pump heating system, characterized in that, Includes a first on / off valve (1), a second on / off valve (2), a first indoor heat exchanger (3), a second indoor heat exchanger (4), a fourth three-way valve (5), a first three-way valve (6), an outdoor heat exchanger (7), a fourth electronic expansion valve (8), a heat exchanger module (10) containing phase change material (9), a compressor (11), a second electronic expansion valve (12), a first electronic expansion valve (13), a first filter (14), an eighth on / off valve (15), a first liquid storage tank (16), an energy storage module (17), a solar photovoltaic panel (18), a second electrical control valve (19), a third electrical control valve (20), a second liquid storage tank (21), a second fluorine pump (22), and a third electrical control valve. Eleven-way shut-off valve (23), third electronic expansion valve (24), first electrical control valve (25), seventh shut-off valve (26), second three-way valve (27), sixth shut-off valve (28), fifth shut-off valve (29), fourth shut-off valve (30), third shut-off valve (31), sixth three-way valve (32), third check valve (33), fifth three-way valve (34), second check valve (35), first fluorine pump (36), first check valve (37), ninth shut-off valve (39), second filter (40), tenth shut-off valve (41), twelfth shut-off valve (42), outdoor integrated unit (43), third three-way valve (46), and solar thermal collector (47); The outdoor integrated unit (43) includes the heat exchanger module (10) and the outdoor heat exchanger (7). The solar photovoltaic panel (18) is installed on the solar collector (47). The solar photovoltaic panel (18) is electrically connected to the energy storage module (17). The energy storage module (17) is electrically connected to the first fluorine pump (36), and its power supply circuit is controlled by the first electrical control valve (25). The energy storage module (17) is electrically connected to the second fluorine pump (22), and its power supply circuit is controlled by the second electrical control valve (19). The second fluorine pump (22) is electrically connected to the compressor (11), and its power supply circuit is controlled to open and close via the third electrical control valve (20). The second fluorine pump (22) is also connected to the compressor (11) in sequence via the third check valve (33), the second on / off valve (2), the third on / off valve (31), and the sixth three-way valve (32). The second fluorine pump (22) is connected to the compressor (11) in sequence via the third check valve (33), the second on / off valve (2), the fifth on / off valve (29), and the sixth on / off valve (20). Valve (28) is connected to the first liquid storage tank (16). The second fluorine pump (22) is connected to the heat exchanger module (10) in sequence through the third check valve (33), the second on / off valve (2), and the fourth on / off valve (30). The second fluorine pump (22) is also connected to the first fluorine pump (36) in sequence through the third check valve (33), the second on / off valve (2), the fifth on / off valve (29), the first on / off valve (1), the fifth three-way valve (34), and the seventh on / off valve (26). The first liquid storage tank (16) is connected to the first indoor heat exchanger (3) and the second indoor heat exchanger (4) in sequence through the first one-way valve (37), the eighth shut-off valve (15) and the fourth three-way valve (5). The first liquid storage tank (16) is also connected to the first indoor heat exchanger (3) and the second indoor heat exchanger (4) in sequence through the first one-way valve (37), the first fluorine pump (36), the second one-way valve (35) and the fourth three-way valve (5). The compressor (11) is connected to the outdoor heat exchanger (7), and the outdoor heat exchanger (7) is connected to the second indoor heat exchanger (4) in sequence through the fourth electronic expansion valve (8), the ninth on / off valve (39), the first three-way valve (6) and the second electronic expansion valve (12). The outdoor heat exchanger (7) is connected to the first indoor heat exchanger (3) in sequence through the fourth electronic expansion valve (8), the ninth on / off valve (39), the first three-way valve (6) and the first electronic expansion valve (13). The first indoor heat exchanger (3) is connected to the first filter (14) in sequence through the first electronic expansion valve (13), the first three-way valve (6) and the tenth shut-off valve (41), and the second indoor heat exchanger (4) is connected to the first filter (14) in sequence through the second electronic expansion valve (12), the first three-way valve (6) and the tenth shut-off valve (41). The first filter (14) is connected to the heat exchanger module (10) in sequence through the second three-way valve (27) and the third electronic expansion valve (24). The first filter (14) is connected to the outdoor heat exchanger (7) in sequence through the second three-way valve (27), the eleventh shut-off valve (23), the third three-way valve (46), the twelfth shut-off valve (42) and the fourth electronic expansion valve (8). The first filter (14) is connected to the second filter (40) in sequence through the second three-way valve (27), the eleventh shut-off valve (23) and the third three-way valve (46). The second filter (40) is connected to the second liquid storage tank (21). The second liquid storage tank (21) is connected to the solar collector (47).

2. The phase change fluorine pump heating system according to claim 1, characterized in that, The phase change fluorine pump heating system is equipped with an electric auxiliary heating device (38) on the side near the outdoor heat exchanger (7).

3. The phase change fluorine pump heating system according to claim 1, characterized in that, The outdoor unit (43) has an air inlet (44) at the top and an air outlet (45) at the bottom.

4. The control method for the phase change fluorine pump heating system according to claim 1, characterized in that, The phase change fluorine pump heating system includes a solar thermal storage heating mode. In this mode, the solar photovoltaic panel (18) generates electricity, which is stored in the energy storage module (17) to power the first fluorine pump (36), the second fluorine pump (22), and the compressor (11). The refrigerant flows out from the second liquid storage tank (21), passes through the solar thermal collector (47), and enters the second fluorine pump (22). At this time, the first on / off valve (1), the second on / off valve (2), and the fifth on / off valve (29) are connected. The fourth shut-off valve (30), the tenth shut-off valve (41), the eleventh shut-off valve (23), and the seventh shut-off valve (26) are open, while the third shut-off valve (31), the sixth shut-off valve (28), the eighth shut-off valve (15), the ninth shut-off valve (39), and the twelfth shut-off valve (42) are closed. After the refrigerant flows to the second shut-off valve (2), it splits into two paths: one path flows through the fourth shut-off valve (30) into the heat exchanger module (10) containing the phase change material (9), and the other path flows out through the second shut-off valve (2). The second three-way valve (27), the eleventh shut-off valve (23), and the third three-way valve (46) flow to the second filter (40) and finally return to the second liquid storage tank (21) to complete one cycle; another path flows into the first shut-off valve (1) through the fifth shut-off valve (29), and after the refrigerant flows out of the fifth three-way valve (34), it flows to the first fluorine pump (36) through the seventh shut-off valve (26); the refrigerant of the first fluorine pump (36) flows into the fourth three-way valve (5) and is divided into two paths: one path flows through the second chamber The refrigerant from the internal heat exchanger (4) flows into the second electronic expansion valve (12) and then into the first three-way valve (6); another path flows into the first electronic expansion valve (13) through the first indoor heat exchanger (3) and then into the first three-way valve (6); the refrigerant from the first three-way valve (6) flows into the second three-way valve (27), the eleventh shut-off valve (23) and the third three-way valve (46) in sequence through the first filter (14); finally, the refrigerant returns to the second liquid storage tank (21) through the second filter (40).

5. The control method for the phase change fluorine pump heating system according to claim 4, characterized in that, The phase change fluorine pump heating system includes a solar thermal storage defrosting mode. In this mode, the solar photovoltaic panel (18) generates electricity, which is stored in the energy storage module (17) to power the second fluorine pump (22) and the compressor (11), thus starting the second fluorine pump (22) and the compressor (11). The refrigerant flows out from the second liquid storage tank (21), enters the second fluorine pump (22) through the solar thermal collector (47), and at this time, the eighth shut-off valve (15) and the second... The on / off valve (2), the fourth on / off valve (30), the ninth on / off valve (39), the seventh on / off valve (26), and the eleventh on / off valve (23) are open, while the third on / off valve (31), the sixth on / off valve (28), the fifth on / off valve (29), the tenth on / off valve (41), the twelfth on / off valve (42), and the first on / off valve (1) are closed; one path of refrigerant flows through the third check valve (33) to the second on / off valve (2), and then through the fourth on / off valve (30) into the phase-containing... In the heat exchanger module (10) of the variable material (9), after the refrigerant flows out, it passes through the second three-way valve (27), the eleventh shut-off valve (23) and the third three-way valve (46) in sequence, flows to the second filter (40), and finally returns to the second liquid storage tank (21) to complete one cycle; on the other side, the refrigerant comes out from the compressor (11), passes through the sixth three-way valve (32), the fifth three-way valve (34), the seventh shut-off valve (26) and the eighth shut-off valve (15) and flows into the fourth three-way valve. (5) The refrigerant is divided into two paths: one path flows into the second electronic expansion valve (12) through the second indoor heat exchanger (4) and then into the first three-way valve (6); the other path flows into the first electronic expansion valve (13) through the first indoor heat exchanger (3) and then into the first three-way valve (6); after the two refrigerants converge in the first three-way valve (6), they flow to the outdoor heat exchanger (7) through the ninth shut-off valve (39) and the fourth electronic expansion valve (8) and return to the compressor (11) to complete one cycle.

6. The control method for the phase change fluorine pump heating system according to claim 5, characterized in that, The phase change fluorine pump heating system includes a phase change module heating mode. In the phase change module heating mode, when the phase change material (9) has sufficient heat storage, the first electrical control valve (25) is opened, and the energy storage module (17) supplies power to the first fluorine pump (36). The fourth shut-off valve (30), the sixth shut-off valve (28), the fifth shut-off valve (29), and the tenth shut-off valve (41) are opened, and the third shut-off valve (31), the second shut-off valve (2), the first shut-off valve (1), the seventh shut-off valve (26), the ninth shut-off valve (39), the eleventh shut-off valve (23), the eighth shut-off valve (15), and the twelfth shut-off valve (42) are closed, and the first fluorine pump (36) is started. The refrigerant flows from the first liquid storage tank (16) through the first check valve (37) to the first fluorine pump. (36), and then flows through the second one-way valve (35) to the fourth three-way valve (5), splitting into two paths: one path flows through the second indoor heat exchanger (4) into the second electronic expansion valve (12), and then into the first three-way valve (6); the other path flows through the first indoor heat exchanger (3) into the first electronic expansion valve (13), and then into the first three-way valve (6); after the two refrigerants converge in the first three-way valve (6), they first flow through the tenth shut-off valve (41) and then through the first filter (14) into the second three-way valve (27); then through the third electronic expansion valve (24) to the heat exchanger module (10) containing the phase change material (9), and finally through the fourth shut-off valve (30), the fifth shut-off valve (29) and the sixth shut-off valve (28) back to the first liquid storage tank (16), completing one cycle.

7. The control method for the phase change fluorine pump heating system according to claim 6, characterized in that, The phase change fluorine pump heating system includes an electric auxiliary defrosting mode. In the electric auxiliary defrosting mode, during the night heating operation, the electric auxiliary heating device (38) is turned on. Because the electric auxiliary heating device (38) is close to the outdoor unit heat exchanger, it defrosts the outdoor heat exchanger (7) through the air duct formed by the air inlet and air outlet, and can store heat for the phase change material (9).

8. The control method for the phase change fluorine pump heating system according to claim 7, characterized in that, The phase change fluorine pump heating system converts solar energy into electrical energy through the solar photovoltaic panel (18) and stores it in the energy storage module (17) to provide power to the first fluorine pump (36), the second fluorine pump (22) and the compressor (11). The refrigerant carries the heat to the phase change material (9) through the solar thermal collector (47) for heat storage, thereby achieving heat storage and defrosting.

9. The control method for the phase change fluorine pump heating system according to claim 7, characterized in that, When the phase change material (9) in the heat exchanger module (10) has sufficient heat storage, it provides heating to the room through the first indoor heat exchanger (3) and the second indoor heat exchanger (4).

10. The control method for the phase change fluorine pump heating system according to claim 7, characterized in that, The switching between solar thermal storage heating mode, solar thermal storage defrosting mode, phase change module heating mode, and electric auxiliary defrosting mode is achieved by opening and closing the on / off valve and the electronic expansion valve.

Images