A solar energy coupled dual-source heat pump heating and cooling system

Abstract

The utility model provides a kind of solar coupling dual-source heat pump's heating and cooling system, system includes solar heat storage circulation system, water source heat pump heat extraction circulation system, water source heat pump supplies domestic hot water circulation system, air energy supply circulation system, water source heat pump heating circulation system, air energy supply domestic hot water circulation system, air energy heat supplement circulation system and temperature monitoring system, improve efficiency by building energy structure optimization, the "PV / T low-temperature waste heat+high-temperature water source heat pump system" domestic hot water heating system form with high efficiency, good stability, low operating cost and other advantages are used, air energy heat supplement measures are realized simultaneously by system design, to improve the stability of solar energy supply domestic hot water, realize domestic hot water system, heating system interconnection, mutual standby, improve the stability of system heating, utilize solar energy, air energy, realize clean low-carbon heating and cooling, with wide application prospect.

Description

Technical Field

[0001] This utility model relates to the field of renewable energy technology, and in particular to a solar-coupled dual-source heat pump heating and cooling system. Background Technology

[0002] In 2020, the total carbon emissions from the entire building process in China reached 5.08 billion tons of CO2, accounting for 50.9% of the country's total carbon emissions. The building operation phase accounted for the largest share of building carbon emissions, approximately 21.9% of the national total. As people aspire to a better life, carbon emissions from the building operation phase will further increase, gradually approaching the levels of developed countries. The energy structure during the building operation phase mainly consists of heating in winter and cooling in summer. Therefore, considering the year-round demand for domestic hot water and electricity, accelerating the optimization of the building energy structure and implementing renewable energy substitution initiatives are important measures to achieve my country's goal of "carbon peaking and carbon neutrality."

[0003] At present, there are the following problems in the utilization of solar energy: (1) The temperature effect of photovoltaic modules is significant. As the operating temperature of photovoltaic modules increases, the power generation efficiency decreases linearly (the power generation efficiency decreases by about 0.3% for every 1°C increase); (2) The waste heat generated by photovoltaic modules cannot be utilized and inhibits power generation; (3) There are problems such as discontinuity and instability in solar energy output. Based on this, how to suppress the temperature effect of photovoltaic modules, utilize the waste heat of photovoltaic modules, and ensure the continuous stability of solar energy supply is one of the current research hotspots. Photovoltaic / thermal unit (PV / T) is a device that attaches a collector to the back of a photovoltaic panel. It can cool down the photovoltaic panel, improve the power generation efficiency, and extend its lifespan. However, while the photovoltaic panel is being cooled down, a large amount of low-grade heat is generated, which results in a waste of energy and resources. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a heating and cooling system of a solar-coupled dual-source heat pump.

[0005] The technical solution adopted in this utility model is:

[0006] A solar-coupled dual-source heat pump heating and cooling system comprises a solar thermal storage circulation system, a water source heat pump heat extraction circulation system, a water source heat pump domestic hot water supply circulation system, an air source energy supply circulation system, a water source heat pump heating circulation system, an air source domestic hot water supply circulation system, an air source heat replenishment circulation system, and a temperature monitoring system.

[0007] The solar thermal energy storage circulation system includes a PV / T, a first heat collection control valve, a hot water storage tank, a heat storage pump, and a second heat collection control valve. The outlet of the PV / T, the first heat collection control valve, the high-temperature inlet of the hot water storage tank, the low-temperature outlet of the hot water storage tank, the heat storage pump, the second heat collection control valve, and the inlet of the PV / T are sequentially connected through pipelines according to the flow direction of the heat transfer medium.

[0008] The water source heat pump heat extraction circulation system includes a hot water storage tank, a heat extraction pump, and a high-temperature water source heat pump unit. The high-temperature outlet of the hot water storage tank, the heat extraction pump, the evaporator inlet of the high-temperature water source heat pump unit, the evaporator outlet of the high-temperature water source heat pump unit, and the low-temperature inlet of the hot water storage tank are sequentially connected through pipelines according to the flow direction of the heat transfer medium. This can realize the thermal energy multiplication effect of solar energy and achieve large-scale energy cascade utilization of the hot water storage tank.

[0009] The water source heat pump domestic hot water circulation system includes a high-temperature water source heat pump unit, a first water source domestic hot water control valve, a domestic hot water device, a domestic hot water pump, a second water source domestic hot water control valve, and a constant pressure water supply device. The condenser outlet of the high-temperature water source heat pump unit, the first water source domestic hot water control valve, the inlet of the domestic hot water device, the outlet of the domestic hot water device, the domestic hot water pump, the second water source domestic hot water control valve, and the condenser inlet of the high-temperature water source heat pump unit are sequentially connected by pipelines according to the flow direction of the heat transfer medium. The constant pressure water supply device is installed at the inlet of the domestic hot water pump. The constant pressure water supply device provides constant pressure and water supply functions for the water source heat pump domestic hot water circulation system. The water source heat pump domestic hot water circulation system operates together with the water source heat pump heat extraction circulation system.

[0010] The air source energy supply circulation system includes an ultra-low temperature air source heat pump, a first air source fan coil control valve, a fan coil unit, a fan coil circulation pump, and a second air source fan coil control valve. The outlet of the ultra-low temperature air source heat pump, the first air source fan coil control valve, the inlet of the fan coil unit, the outlet of the fan coil unit, the fan coil circulation pump, the second air source fan coil control valve, and the inlet of the ultra-low temperature air source heat pump are sequentially connected through pipelines according to the flow direction of the heat transfer medium. The air source energy supply circulation system includes two cycles: an air source heating cycle and an air source cooling cycle. That is, the fan coil unit can provide heating in winter and cooling in summer by using the reverse Carnot cycle principle through the internal four-way reversing valve of the ultra-low temperature air source heat pump.

[0011] The water source heat pump heating cycle system includes a high-temperature water source heat pump unit, a first water source heating control valve, a fan coil unit, a fan coil unit circulation pump, and a second water source heating control valve. The condenser outlet of the high-temperature water source heat pump unit, the first water source heating control valve, the fan coil unit inlet, the fan coil unit outlet, the fan coil unit circulation pump, the second water source heating control valve, and the condenser inlet of the high-temperature water source heat pump unit are sequentially connected through pipelines according to the flow direction of the heat transfer medium. The water source heat pump domestic hot water circulation system needs to operate together with the water source heat pump heat extraction circulation system. When the ultra-low temperature air source heat pump fails, the air source heating cycle switches to the water source heat pump heating cycle to supply heat to the fan coil unit, so that the air source heating system and the high-temperature water source heat pump heating system are interconnected, serve as backups for each other, and improve the system heating stability.

[0012] The air-source heat pump domestic hot water circulation system includes an ultra-low temperature air source heat pump, a first air-source heat pump domestic hot water control valve, a domestic hot water device, a domestic hot water pump, a first air-source heat pump domestic hot water control valve, and a constant pressure water supply device. The outlet of the ultra-low temperature air source heat pump, the first air-source heat pump domestic hot water control valve, the inlet of the domestic hot water device, the outlet of the domestic hot water device, the domestic hot water pump, the first air-source heat pump domestic hot water control valve, and the inlet of the ultra-low temperature air source heat pump are sequentially connected through pipelines according to the flow direction of the heat transfer medium. The constant pressure water supply device is installed at the inlet of the domestic hot water pump. The constant pressure water supply device provides constant pressure and water supply for the water source heat pump domestic hot water circulation system. The air-source heat pump domestic hot water circulation system operates when the high-temperature water source heat pump unit fails. The water source heat pump domestic hot water circulation system and the air-source heat pump domestic hot water circulation system are interconnected and serve as backups for each other, improving the stability of the domestic hot water supply system. In daily operation, the domestic hot water supply is mainly provided by the water source heat pump domestic hot water circulation system, with the air-source heat pump domestic hot water circulation system as a supplement.

[0013] The air source heat pump circulation system includes an ultra-low temperature air source heat pump, a first heat replenishment control valve, a hot water storage tank, a heat storage pump, and a second heat replenishment control valve. The outlet of the ultra-low temperature air source heat pump, the first heat replenishment control valve, the high temperature inlet of the hot water storage tank, the low temperature outlet of the hot water storage tank, the heat storage pump, the second heat replenishment control valve, and the inlet of the ultra-low temperature air source heat pump are sequentially connected through pipelines according to the flow direction of the heat transfer medium. When there is no solar radiation for consecutive cloudy days or at night, and the high temperature outlet temperature of the hot water storage tank is lower than the set temperature, the air source heat pump circulation system can be started during off-peak electricity hours to replenish the hot water storage tank, thereby reducing the operating electricity cost of the system.

[0014] The temperature monitoring system, which is a system for monitoring the temperatures at the outlets of PV / T, the high-temperature outlet of the hot water storage tank, the outlet of the fan coil unit, and the outlet of the domestic hot water device, includes a controller, a first temperature sensor, a second temperature sensor, a third temperature sensor, and a fourth temperature sensor. The first temperature sensor is used to monitor the outlet temperature of PV / T, the second temperature sensor is used to monitor the high-temperature outlet temperature of the hot water storage tank, the third temperature sensor is used to monitor the outlet temperature of the fan coil unit, and the fourth temperature sensor is used to monitor the outlet temperature of the domestic hot water device. The controller is respectively connected in line control with the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, the first heat collection control valve, the second heat collection control valve, the first heat storage control valve, the second heat storage control valve, the first air energy supply fan coil control valve, the second air energy fan coil control valve, the first water source heating control valve, the second water source heating control valve, the first air energy supply domestic hot water control valve, the second air energy supply domestic hot water control valve, the first water source supply domestic hot water control valve, the second water source supply domestic hot water control valve, the heat storage pump, the heat extraction pump, the fan coil circulation pump, and the domestic hot water supply pump.

[0015] Preferably, in the above heating and cooling system of a solar-coupled dual-source heat pump, the PV / T adopts a vacuum tube type solar photovoltaic-thermal integrated module.

[0016] Preferably, in the above heating and cooling system of a solar-coupled dual-source heat pump, each of the control valves is an electric control valve.

[0017] Preferably, in the above heating and cooling system of a solar-coupled dual-source heat pump, the PV / T is successively connected to an inverter and the power grid. The inverter is respectively connected in load with a high-temperature water source heat pump unit, an ultra-low temperature air source heat pump, a heat storage pump, a heat extraction pump, a fan coil circulation pump, and a domestic hot water supply pump through a 380V AC bus. The direct current sent by the PV / T enters the inverter and is converted into alternating current to supply power to the high-temperature water source heat pump unit, the ultra-low temperature air source heat pump, the heat storage pump, the heat extraction pump, the fan coil circulation pump, and the domestic hot water supply pump, or the surplus electricity enters the power grid. The PV / T generates electricity throughout the year and adopts the mode of "spontaneous use of electricity and surplus electricity on the grid".

[0018] The beneficial effects of the present utility model are:

[0019] The aforementioned solar-coupled dual-source heat pump heating and cooling system includes a solar thermal storage circulation system, a water source heat pump heat extraction circulation system, a water source heat pump domestic hot water circulation system, an air source energy supply circulation system, a water source heat pump heating circulation system, an air source domestic hot water circulation system, an air source heat supplementation circulation system, and a temperature monitoring system. Through building energy structure optimization to improve efficiency, the adopted "PV / T low-temperature waste heat + high-temperature water source heat pump system" domestic hot water heating system has advantages such as high efficiency, good stability, and low operating costs. Simultaneously, through system design to implement air source heat supplementation measures, it improves the stability of solar-powered domestic hot water supply, achieving interconnection and mutual backup between the domestic hot water supply system and the heating system, thus improving the stability of the system's heating supply. Utilizing solar and air energy, it achieves clean and low-carbon heating and cooling, and has broad application prospects. Specifically, it manifests as follows:

[0020] (1) Utilize PV / T low-temperature waste heat as a heat source for high-temperature water source heat pumps, and increase the temperature of hot water by consuming a small amount of electricity (photovoltaic green electricity), thereby achieving efficient solar energy supply of domestic hot water.

[0021] (2) The “PV / T low-temperature waste heat + high-temperature water source heat pump system” domestic hot water supply system has advantages such as high efficiency, good stability and low operating cost compared with traditional collectors and air source heat pumps that directly supply domestic hot water.

[0022] (3) Considering the seasonality, discontinuity, instability and stability of solar heating, the system is optimized to implement air source heat supplementation measures, thereby improving the stability of solar-powered domestic hot water supply.

[0023] (4) Through system design, the high-temperature water source heat pump domestic hot water supply system and the air source domestic hot water supply system, as well as the high-temperature water source heat pump heating system and the air source heating system are interconnected, thereby improving the stability of the system heating.

[0024] (5) Setting a lower thermal storage start-up temperature can further improve the PV / T power generation efficiency and lifespan by cooling the photovoltaic cells; various energy-consuming equipment can absorb solar photovoltaic power generation, reduce fossil energy consumption, and reduce building heating and cooling operation costs, which has broad application prospects and is conducive to promotion and application. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the heating and cooling system of the solar-coupled dual-source heat pump described in this utility model.

[0026] In the figure: 1. PV / T; 2. hot water storage tank; 3. high-temperature water source heat pump unit; 4. ultra-low temperature air source heat pump; 5. fan coil unit; 6. domestic hot water device; 711. first heat collection control valve; 712. second heat collection control valve; 721. first heat supplement control valve; 722. second heat supplement control valve; 731. first air energy supply fan coil control valve; 732. second air energy fan coil control valve; 741. first water source heating control valve; 742. second water source heating control valve; 751. first air energy supply domestic hot water control valve; 752. second air energy supply domestic hot water control valve; 761. first water source supply domestic hot water control valve; 762. second water source supply domestic hot water control valve; 81. storage heat pump; 82. extraction heat pump; 83. fan coil circulation pump; 84. domestic hot water supply pump; 9. reverse control integrated machine; 10. power grid; 111. first temperature sensor; 112. second temperature sensor; 113. third temperature sensor; 114. fourth temperature sensor; 12. controller; 13. constant pressure water supply device Specific embodiments

[0027] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Embodiment 1

[0029] As Figure 1 shown, a heating and cooling system of a solar-coupled dual-source heat pump includes PV / T 1, a hot water storage tank 2, a high-temperature water source heat pump 3, an ultra-low temperature air source heat pump 4, a fan coil unit 5, a domestic hot water device 6, a first heat collection control valve 711, a second heat collection control valve 712, a first heat supplement control valve 721, a second heat supplement control valve 722, a first air energy supply fan coil control valve 731, a second air energy fan coil control valve 732, a first water source heating control valve 741, a second water source heating control valve 742, a first air energy supply domestic hot water control valve 751, a second air energy supply domestic hot water control valve 752, a first water source supply domestic hot water control valve 761, a second water source supply domestic hot water control valve 762, a storage heat pump 81, an extraction heat pump 82, a fan coil circulation pump 83, a domestic hot water supply pump 84, a reverse control integrated machine 9, a power grid 10, a first temperature sensor 111, a second temperature sensor 112, a third temperature sensor 113, a fourth temperature sensor 114, a controller 12, and a constant pressure water supply device 13. The PV / T 1 adopts a vacuum tube type solar photovoltaic-thermal integration component. The control valve is an electric control valve and is arranged in each system circulation. The constant pressure water supply device 13 provides constant pressure and water supply functions for the domestic hot water device. Specifically:[[]]

[0030] The outlet of PV / T1, the first heat collection control valve 711, the high-temperature inlet of the hot water storage tank 2, the low-temperature outlet of the hot water storage tank 2, the heat storage pump 81, the second heat collection control valve 712, and the inlet of PV / T1 are sequentially connected through pipelines in accordance with the flow direction of the heat transfer medium to form a solar thermal storage cycle.

[0031] The high-temperature outlet of the hot water storage tank 2, the heat pump 82, the evaporator inlet of the high-temperature water source heat pump unit 3, the evaporator outlet of the high-temperature water source heat pump unit 3, and the low-temperature inlet of the hot water storage tank 2 are sequentially connected through pipelines according to the flow direction of the heat transfer medium to form a water source heat pump heat extraction cycle. At this time, the thermal energy multiplication effect of solar energy can be realized, and the energy cascade utilization of the hot water storage tank 2 can be realized over a large span.

[0032] The high-temperature water source heat pump unit 3, its condenser outlet, first water source domestic hot water control valve 761, domestic hot water device 6 inlet, domestic hot water device 6 outlet, domestic hot water pump 84, second water source domestic hot water control valve 762, and high-temperature water source heat pump unit 3 condenser inlet are sequentially connected via pipelines according to the heat transfer fluid flow direction to form a water source heat pump domestic hot water circulation system. A constant pressure water supply device 13 is installed at the inlet of the domestic hot water pump. This constant pressure water supply device provides constant pressure and water supply for the water source heat pump domestic hot water circulation system. The water source heat pump domestic hot water circulation system needs to operate in conjunction with the water source heat pump heat extraction circulation system. In this invention, solar energy serves as the low-temperature source side, and the high-temperature water source heat pump unit 2 raises the temperature to meet the temperature requirements of the domestic hot water device 6, thereby achieving year-round domestic hot water supply.

[0033] The outlet of the ultra-low temperature air source heat pump 4, the first air source fan coil control valve 731, the inlet of the fan coil 5, the outlet of the fan coil 5, the fan coil circulation pump 83, the second air source fan coil control valve 732, and the inlet of the ultra-low temperature air source heat pump 4 are sequentially connected through pipelines according to the flow direction of the heat transfer medium to form an air energy supply cycle. The air energy supply cycle includes two cycles: an air energy heating cycle and an air energy cooling cycle. That is, the fan coil 5 can achieve the function of heating in winter and cooling in summer by using the reverse Carnot cycle principle through the internal four-way reversing valve of the ultra-low temperature air source heat pump 4.

[0034] The high-temperature water source heat pump unit 3 condenser outlet, first water source heating control valve 741, fan coil unit 5 inlet, fan coil unit 5 outlet, fan coil unit circulation pump 83, second water source heating control valve 742, and high-temperature water source heat pump unit 3 condenser inlet are sequentially connected through pipelines according to the heat transfer medium flow direction to form a water source heat pump heating cycle. The water source heat pump domestic hot water cycle needs to operate together with the water source heat pump heat extraction cycle. When the ultra-low temperature air source heat pump 4 fails, the air source heating cycle switches to the water source heat pump heating cycle to supply heat to the fan coil unit 5. It can be seen that the air source heating system and the high-temperature water source heat pump heating system are interconnected, serve as backups for each other, and improve the system heating stability. In the daily heating operation, the air source heating system is the main system, and the high-temperature water source heat pump heating system is the auxiliary system.

[0035] The outlet of the ultra-low temperature air source heat pump 4, the first air source heat pump control valve 751, the inlet of the domestic hot water device 6, the outlet of the domestic hot water device 6, the domestic hot water pump 84, the first air source heat pump control valve 752, and the inlet of the ultra-low temperature air source heat pump 4 are sequentially connected through pipelines according to the flow direction of the heat transfer medium to form an air source heat pump domestic hot water circulation system. A constant pressure water supply device 13 is installed at the inlet of the domestic hot water pump. This constant pressure water supply device provides constant pressure and water supply for the water source heat pump domestic hot water circulation system. The air source heat pump domestic hot water circulation system operates when the high-temperature water source heat pump unit 3 fails. Therefore, the high-temperature water source heat pump domestic hot water system and the air source heat pump domestic hot water system are interconnected, serve as backups for each other, and improve the stability of the domestic hot water supply system. In daily operation, the high-temperature water source heat pump domestic hot water system is the primary system, with the air source heat pump domestic hot water system as a secondary system.

[0036] The outlet of the ultra-low temperature air source heat pump 4, the first heat replenishment control valve 721, the high temperature inlet of the hot water storage tank 2, the low temperature outlet of the hot water storage tank 2, the heat storage pump 81, the second heat replenishment control valve 722, and the inlet of the ultra-low temperature air source heat pump 4 are sequentially connected through pipelines in accordance with the flow direction of the heat transfer medium to form an air energy heat replenishment cycle. When there is no solar radiation for consecutive cloudy days or at night, and the high temperature outlet temperature of the hot water storage tank 2 is lower than the set temperature (second temperature sensor), the air energy heat replenishment cycle can be started during off-peak hours to replenish the hot water storage tank 2, thereby reducing the operating electricity cost of the system.

[0037] The temperature monitoring system monitors four temperatures: the PV / T outlet, the high-temperature outlet of the hot water storage tank 2, the fan coil unit outlet, and the domestic hot water device outlet. It includes a first temperature sensor 111, a second temperature sensor 112, a third temperature sensor 113, and a fourth temperature sensor 114. The first temperature sensor 111 monitors the outlet temperature of the PV / T1; the second temperature sensor 112 monitors the high-temperature outlet temperature of the hot water storage tank 2; the third temperature sensor 113 monitors the outlet temperature of the fan coil unit 5; and the fourth temperature sensor 114 monitors the outlet temperature of the domestic hot water device 6. The controller 12 is connected to the first temperature sensor 111, the second temperature sensor 112, the third temperature sensor 113, and the fourth temperature sensor 114. Sensor 112, third temperature sensor 113, fourth temperature sensor 114, first heat collection control valve 711, second heat collection control valve 712, first heat storage control valve 721, second heat storage control valve 722, first air source fan coil control valve 731, second air source fan coil control valve 732, first water source heating control valve 741, second water source heating control valve 742, first air source domestic hot water control valve 751, second air source domestic hot water control valve 752, first water source domestic hot water control valve 761, second water source domestic hot water control valve 762, heat storage pump 81, heat extraction pump 82, fan coil circulation pump 83, and domestic hot water pump 84 are connected.

[0038] The PV / T1 is connected in sequence to the inverter control unit 9 and the power grid 10. The inverter control unit 9 is connected to the loads of the high-temperature water source heat pump 3, the ultra-low temperature air source heat pump 4, the heat storage pump 81, the heat extraction pump 82, the fan coil circulation pump 83, and the domestic hot water pump 84 via a 380V AC bus. The DC power sent by the PV / T1 is converted into AC power by the inverter control unit 9 and then used to power the loads of the high-temperature water source heat pump 3, the ultra-low temperature air source heat pump 4, the heat storage pump 81, the heat extraction pump 82, the fan coil circulation pump 83, and the domestic hot water pump 84, or the surplus power is fed into the power grid 10. The PV / T1 photovoltaic power generation operates throughout the year and adopts a "self-consumption and surplus power grid connection" mode.

[0039] The control method for the above-mentioned solar-coupled dual-source heat pump heating and cooling system includes the following specific steps:

[0040] (I) Non-heating season

[0041] During the day, as solar radiation increases, the heat collected by PV / T1 continuously increases, and the outlet temperature of PV / T1 continuously rises. When the outlet temperature of PV / T1 reaches the first set value (20°C in this embodiment), the controller 12 outputs a signal to start the heat storage pump 81. At this time, both the first heat collection control valve 711 and the second heat collection control valve 712 are open, and both the first heat storage control valve 721 and the second heat storage control valve 722 are closed, storing the heat collected by PV / T1 in the hot water storage tank 2, ready for use as the heat source for the high-temperature water source heat pump, i.e., operating in solar thermal storage mode. Simultaneously, by cooling PV / T1, the power generation efficiency of PV / T1 is improved.

[0042] When domestic hot water is supplied year-round, if the outlet temperature of the domestic hot water device 6 is lower than the fourth temperature setting value (50℃ in this embodiment), the controller 12 outputs a signal to start the domestic hot water pump 84. At this time, both the first water source domestic hot water control valve 761 and the second water source domestic hot water control valve 762 are open, and both the first water source heating control valve 741 and the second water source heating control valve 742 are closed, supplying domestic hot water to the building, i.e., operating the water source heat pump for domestic hot water circulation. Simultaneously, the controller 12 outputs a signal to start the heat extraction pump 82, extracting the heat stored in the hot water storage tank 2, i.e., operating the water source heat pump for heat extraction circulation. At this time, a small amount of electrical energy (photovoltaic green electricity) is consumed, thereby realizing the solar energy multiplication effect.

[0043] When there are consecutive cloudy days or no solar radiation at night, and the inlet temperature of the evaporator of the high-temperature water source heat pump unit 3 is lower than the second temperature setpoint (7°C in this embodiment), the controller 12 outputs a signal to start the heat storage pump 81. At this time, both the first heat replenishment control valve 721 and the second heat replenishment control valve 722 are open, and both the first water source heating control valve 741 and the second water source heating control valve 742 are closed, replenishing heat to the hot water storage tank 2, i.e., operating the air source heat replenishment cycle. When the temperature is lower than the second temperature setpoint, the water tank can be replenished during off-peak electricity hours at night to meet the heat demand of the water source heat pump for domestic hot water.

[0044] This invention sets the first temperature setting to a relatively low heat storage start-up temperature (20℃ in this embodiment), thereby increasing the solar heat storage time and providing a PV / T1 cooling effect. Simultaneously, it serves as a heat source for the warm water source heat pump, increasing the amount of stored heat. The second temperature setting is set to a relatively low heat extraction start-up temperature (7℃ in this embodiment), increasing the heat extraction temperature difference and thus increasing the solar energy extraction capacity, thereby improving the utilization efficiency of solar energy.

[0045] (II) Heating Season

[0046] During winter heating, when the outlet temperature of fan coil unit 5 is lower than the third temperature setting value (40℃ in this embodiment), controller 12 outputs a signal to start the fan coil circulation pump 83. At this time, the first air-source fan coil control valve 731 and the second air-source fan coil control valve 732 are both open, and the first heat replenishment control valve 721 and the second heat replenishment control valve 722, the first air-source domestic hot water control valve 751 and the second air-source domestic hot water control valve 752 are all closed, supplying heat to the building, that is, running the air-source heating cycle.

[0047] (III) Cooling Season

[0048] During summer cooling, when the outlet temperature of fan coil unit 5 is higher than the third temperature setting value (12℃ in this embodiment), controller 12 outputs a signal to start the fan coil circulation pump 83. At this time, the first air-source fan coil control valve 731 and the second air-source fan coil control valve 732 are both open, and the first heat supply control valve 721 and the second heat supply control valve 722, the first air-source domestic hot water control valve 751 and the second air-source domestic hot water control valve 752 are all closed, supplying cooling to the building, that is, running the air-source cooling cycle.

[0049] The control method for the heating and cooling system of the above-mentioned solar-coupled dual-source heat pump can be configured such that the first temperature setting value can be set to 20℃-25℃; the second temperature setting value can be set to 7℃-12℃; the third temperature setting value can be set to 40℃-45℃ during the heating season and 12℃-17℃ during the cooling season; and the fourth temperature setting value can be set to 50℃-60℃.

[0050] The above control method takes into account the seasonality, discontinuity, and instability of solar heating. It optimizes the control system to implement air source heat supplementation measures, thereby improving the stability of solar-powered domestic hot water supply. Utilizing low-temperature waste heat from a PV / T system as the heat source for a high-temperature water source heat pump, and consuming a small amount of electricity (photovoltaic green electricity) to heat the water, achieves efficient solar-powered domestic hot water supply. Compared to traditional collectors and air source heat pumps directly supplying domestic hot water, the "PV / T low-temperature waste heat + high-temperature water source heat pump system" domestic hot water supply system has advantages such as high efficiency, good stability, and low operating costs. Setting a lowered heat storage start-up temperature and cooling the photovoltaic cells can further improve the PV / T power generation efficiency and lifespan. Various energy-consuming devices can absorb solar photovoltaic power generation, reducing fossil fuel consumption and lowering building heating and cooling operating costs, demonstrating broad application prospects and facilitating widespread application.

[0051] In summary, this utility model utilizes the waste heat generated by photovoltaic panels as the low-grade heat extraction for a high-temperature water source heat pump through system design. By consuming a small amount of electricity, it converts the waste heat into hot water at 50℃~60℃, thereby improving the overall efficiency of solar energy utilization. Simultaneously, the system design incorporates air source heat supplementation measures, thereby enhancing the continuous stability of solar energy supply. It achieves interconnectivity between the high-temperature water source heat pump system for domestic hot water supply and the air source heat pump system for domestic hot water supply, as well as between the high-temperature water source heat pump system for heating and the air source heat pump system for heating, improving the stability of the system's heating supply. Utilizing solar and air energy, it realizes clean and low-carbon heating and cooling for buildings, demonstrating broad application prospects.

[0052] The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements to the technical solutions of the present utility model made by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope of the present utility model.

Claims

1. A solar-coupled dual-source heat pump heating and cooling system, characterized in that: It consists of a solar thermal storage circulation system, a water source heat pump heat extraction circulation system, a water source heat pump domestic hot water circulation system, an air source energy supply circulation system, a water source heat pump heating circulation system, an air source domestic hot water circulation system, an air source heat replenishment circulation system, and a temperature monitoring system. The solar thermal energy storage circulation system includes a PV / T (1), a first heat collection control valve (711), a hot water storage tank (2), a heat storage pump (81), and a second heat collection control valve (712). The outlet of the PV / T, the first heat collection control valve, the high-temperature inlet of the hot water storage tank, the low-temperature outlet of the hot water storage tank, the heat storage pump, the second heat collection control valve, and the inlet of the PV / T1 are sequentially connected through pipelines according to the flow direction of the heat transfer medium. The water source heat pump heat extraction circulation system includes a hot water storage tank (2), a heat pump (82) and a high-temperature water source heat pump unit (3). The high-temperature outlet of the hot water storage tank, the heat pump, the evaporator inlet of the high-temperature water source heat pump unit, the evaporator outlet of the high-temperature water source heat pump unit and the low-temperature inlet of the hot water storage tank are sequentially connected by pipelines according to the flow direction of the heat transfer medium. The water source heat pump domestic hot water circulation system includes a high-temperature water source heat pump unit (3), a first water source domestic hot water control valve (761), a domestic hot water device (6), a domestic hot water pump (84), a second water source domestic hot water control valve (762), and a constant pressure water supply device (13). The condenser outlet of the high-temperature water source heat pump unit, the first water source domestic hot water control valve, the inlet of the domestic hot water device, the outlet of the domestic hot water device, the domestic hot water pump, the second water source domestic hot water control valve, and the condenser inlet of the high-temperature water source heat pump unit are sequentially connected through pipelines according to the flow direction of the heat transfer medium. The constant pressure water supply device is installed at the inlet of the domestic hot water pump. The air source heat pump circulation system includes an ultra-low temperature air source heat pump (4), a first air source fan coil control valve (731), a fan coil unit (5), a fan coil circulation pump (83), and a second air source fan coil control valve (732). The outlet of the ultra-low temperature air source heat pump, the first air source fan coil control valve, the inlet of the fan coil unit, the outlet of the fan coil unit, the fan coil circulation pump, the second air source fan coil control valve, and the inlet of the ultra-low temperature air source heat pump are sequentially connected through pipelines according to the flow direction of the heat transfer medium. The water source heat pump heating circulation system includes a high-temperature water source heat pump unit (3), a first water source heating control valve (741), a fan coil unit (5), a fan coil unit circulation pump (83), and a second water source heating control valve (742). The condenser outlet of the high-temperature water source heat pump unit, the first water source heating control valve, the fan coil unit inlet, the fan coil unit outlet, the fan coil unit circulation pump, the second water source heating control valve, and the condenser inlet of the high-temperature water source heat pump unit are sequentially connected through pipelines according to the flow direction of the heat transfer medium. The air-source heat pump system for domestic hot water circulation includes an ultra-low temperature air source heat pump (4), a first air-source heat pump control valve for domestic hot water (751), a domestic hot water device (6), a domestic hot water pump (84), a second air-source heat pump control valve for domestic hot water (752), and a constant pressure water supply device (13). The outlet of the ultra-low temperature air source heat pump, the first air-source heat pump control valve for domestic hot water, the inlet of the domestic hot water device, the outlet of the domestic hot water device, the domestic hot water pump, the second air-source heat pump control valve for domestic hot water, and the inlet of the ultra-low temperature air source heat pump are sequentially connected through pipelines according to the flow direction of the heat transfer medium. The constant pressure water supply device is installed at the inlet of the domestic hot water pump. The air source heat replenishment circulation system includes an ultra-low temperature air source heat pump (4), a first heat replenishment control valve (721), a hot water storage tank (2), a heat storage pump (81), and a second heat replenishment control valve (722). The outlet of the ultra-low temperature air source heat pump, the first heat replenishment control valve, the high temperature inlet of the hot water storage tank, the low temperature outlet of the hot water storage tank, the heat storage pump, the second heat replenishment control valve, and the inlet of the ultra-low temperature air source heat pump are sequentially connected through pipelines according to the flow direction of the heat transfer medium. The temperature monitoring system, which monitors the temperatures of four outlets—PV / T outlet, hot water storage tank high-temperature outlet, fan coil unit outlet, and domestic hot water device outlet—includes a controller (12), a first temperature sensor (111), a second temperature sensor (112), a third temperature sensor (113), and a fourth temperature sensor (114). The first temperature sensor is used to monitor the outlet temperature of PV / T, the second temperature sensor is used to monitor the high-temperature outlet temperature of the hot water storage tank, the third temperature sensor is used to monitor the outlet temperature of the fan coil unit, and the fourth temperature sensor is used to monitor the outlet temperature of the domestic hot water device. The controller is connected to the circuit control of the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, the first heat collection control valve, the second heat collection control valve, the first heat storage control valve, the second heat storage control valve, the first air source fan coil control valve, the second air source fan coil control valve, the first water source heating control valve, the second water source heating control valve, the first air source domestic hot water control valve, the second air source domestic hot water control valve, the first water source domestic hot water control valve, the second water source domestic hot water control valve, the heat storage pump, the heat extraction pump, the fan coil circulation pump, and the domestic hot water pump.

2. The solar-coupled dual-source heat pump heating and cooling system according to claim 1, characterized in that: The PV / T uses a vacuum tube solar photovoltaic-thermal integrated module.

3. The solar-coupled dual-source heat pump heating and cooling system according to claim 1, characterized in that: Each of the control valves is an electrically controlled valve.

4. The solar-coupled dual-source heat pump heating and cooling system according to claim 1, characterized in that: The PV / T is connected in sequence to the inverter control unit (9) and the power grid (10). The inverter control unit is connected to the loads of the high temperature water source heat pump unit (3), the ultra-low temperature air source heat pump (4), the heat storage pump (81), the heat extraction pump (82), the fan coil circulation pump (83), and the domestic hot water pump (84) through the AC bus.

Images