Quadruple combined supply system with coupled photovoltaic power supply and three-purpose machine

Abstract

The invention discloses a photovoltaic power source and three-purpose machine coupled quadruple supply system, and belongs to the field of photovoltaic energy, building energy conservation and air conditioners. The system comprises a photovoltaic power supply input system and a cold, warm and hot water three-purpose machine, according to the three-purpose machine, circulation of four working modes of refrigeration, refrigeration and water heating, heating and outdoor heat absorption water heating is achieved through unique connection of a throttler assembly composed of a compressor, a hot water heat exchanger, an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, a liquid storage device and four throttlers and a Y-shaped three-way connector. Seven efficient and energy-saving operation modes are developed in cooperation with forced hot water circulation prepared through hot water and dehumidification and heat compensation hot water circulation so as to meet the requirements of customers for air conditioning, heating, hot water and dehumidification and heat compensation at different environment temperatures, and the COP of the mode of refrigerating and preparing hot water at the same time is larger than 6.50; the energy-efficient four-combined supply system of electricity, cold water, warm water and hot water consumed on the spot by photovoltaic power generation is created; solar energy is scientifically utilized, and harmony and unification of energy consumption and low-carbon emission are achieved.

Description

Technical Field

[0001] This invention belongs to the field of distributed photovoltaic application and building heating, ventilation and air conditioning and heat pump water preparation technology, specifically involving a photovoltaic coupled electric cooling, heating and hot water four-in-one system. Background Technology

[0002] In building energy consumption, cooling, heating, and domestic hot water supply account for the majority. Currently, conventional solutions mostly rely on grid electricity to drive air conditioners and electric water heaters, putting enormous pressure on the grid during peak electricity consumption periods. While solar water heaters can save some electricity, they are highly dependent on weather conditions and suffer from a supply-demand imbalance, with excess heat in summer and insufficient heat in winter. From a thermodynamic perspective, solar radiation energy is a high-grade energy source containing a large amount of usable energy that can be converted into work. Using it only for producing low-temperature domestic hot water is essentially a waste of energy quality, yet this issue has long been neglected. Currently, solar photovoltaic power generation technology is becoming increasingly mature, with large-scale centralized photovoltaic power plants transmitting electricity to the national grid after inversion. However, the regional distribution of centralized power generation... Electricity consumption areas are often geographically dispersed, making energy storage and transmission technologies complex and accompanied by considerable energy loss. In contrast, distributed photovoltaic (PV) power generation combined with energy storage technology can provide on-site power for household appliances, offering significant advantages and representing an important development direction for new energy utilization. The application of solar PV in building energy supply and the construction of green energy buildings have received high attention. Existing technologies already include some solutions for directly driving air conditioners using PV power generation. For example, the invention patent application number 201110240252.8, "Solar Photovoltaic Grid-Connected Inverter and Solar Inverter Air Conditioning System," discloses a solar air conditioning system using a DC inverter air conditioner. Another example is application number 201811035927.3 (publication number 108870602). A) discloses an "integrated solar thermal, photovoltaic and air conditioning system", including a solar photovoltaic device, a solar heat pipe device, and an indoor absorption cooling device, radiant heating device and control system; another example is "an air conditioning system, air conditioner and control method" with application number 202311592722.6, which discloses a relatively complex system structure and has limited practical value; looking at such solutions, they are either single in function, usually only realizing cooling / heating or simple hot water production, or too complex and difficult to promote, and none of them have deeply integrated multiple functions such as power generation, cooling, heating and hot water into a highly efficient and coordinated whole system; Therefore, there is an urgent need in this field for a true four-in-one power system that can deeply integrate photovoltaic power generation, efficiently recover photovoltaic waste heat, and intelligently coordinate multiple loads such as cooling, heating, and hot water. Summary of the Invention

[0003] This invention aims to overcome the shortcomings of existing technologies and, based on the principle of efficient cascade utilization of solar energy, proposes a four-in-one system coupling photovoltaic power and a three-in-one water heater. The system first converts high-grade solar radiation energy into electrical energy using a photovoltaic power system, then uses this electrical energy to drive the three-in-one water heater. The three-in-one water heater absorbs low-grade air energy to produce heat, obtaining several times the amount of heat consumed for heating or producing domestic hot water. Simultaneously, cooling and air conditioning can be achieved during the extraction of indoor air heat. The overall energy efficiency ratio of the system can reach over 6.5. In summer, it greatly alleviates the power supply pressure on the public power grid. In spring and autumn, when the three-in-one water heater is idle, the photovoltaic power system can feed surplus electricity back to the municipal power grid. This invention constructs a unified four-in-one energy-saving system integrating electricity, air conditioning, heating, and hot water, realizing the scientific utilization of solar energy and the local consumption of solar power generation. It effectively reduces the dependence on traditional carbon-based electricity and gas for cooling, air conditioning, domestic hot water, and winter heating in the residential sector, reducing carbon emissions. It provides an advanced and feasible technological model for green energy buildings.

[0004] A four-phase power supply system coupling a photovoltaic power source with a three-phase power generator, characterized in that: it includes... The photovoltaic power input system is used to prioritize supplying photovoltaic power to user loads, with surplus power uploaded to the municipal power grid; The three-in-one machine for heating, cooling and hot water is electrically connected to the photovoltaic power input system. It absorbs air energy to produce heat for heating or producing domestic hot water, and absorbs indoor air energy to achieve both air conditioning and domestic hot water production. Indoor air conditioning and heating heat exchange system is used to transfer the cooling or heating capacity extracted by the three-in-one machine to the indoor air to achieve cooling or heating. A hot water preparation and supply system is used to heat domestic hot water using the heat extracted by the three-in-one machine and to provide domestic hot water supply. A dehumidification and heating hot water system is used to extend the production of domestic hot water to the dehumidification process to replenish the heat in the room; The signal detection, processing, and execution system is used to control the start and stop of relevant equipment in the system based on the detected signals and the set operating mode parameters.

[0005] The photovoltaic power input system is a photovoltaic and grid-connected system, which includes a photovoltaic module array, a DC combiner box, a grid-connected inverter, an AC distribution box / grid-connected box, and a bidirectional meter connected in sequence; the output end of the AC distribution box / grid-connected box is connected to the user's household main distribution box.

[0006] The three-in-one unit includes: a compressor, a hot water heat exchanger, an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, a liquid receiver, a throttle assembly, and a Y-type three-way connector; The connection method of the three-in-one machine is as follows: the air outlet of the compressor is connected to the inlet of the hot water heat exchanger; the hot water heat exchanger is installed vertically, and its outlet is connected to the first interface of the two upper ports of the vertically installed Y-type tee connector; the Y-type tee connector serves as a gas-liquid separator at the outlet of the hot water heat exchanger, and its upper second interface is the air outlet connected to the first interface inlet of the four-way valve; the lower liquid outlet third interface of the Y-type tee connector is connected to the first throttling interface of the throttling device assembly. The throttle assembly consists of a first, second, third, and fourth throttle and its one-way valve, and has a first, second, and third throttle interface; The first throttling interface is a parallel port of the inlet of the first and second throttling devices, and is connected to the third interface (outlet) of the Y-type three-way connector; The second throttling interface is a common port for the liquid outlets of the first and third throttling devices and the liquid inlet of the fourth throttling device, and is connected to the liquid port of the outdoor heat exchanger; The third throttling interface is the common connection point of the liquid outlet of the second and fourth throttling devices and the one-way valve and the liquid inlet of the third throttling device, and is connected to the liquid port of the indoor heat exchanger. The four-way valve has four ports, with its first, second, third, and fourth ports connected to the second port of the Y-type three-way connector, the air inlet of the indoor heat exchanger, the air inlet of the outdoor heat exchanger, and the air inlet of the liquid receiver, respectively. The outlet of the liquid receiver is connected to the compressor suction port; Connect the pipes as described above to form the three-in-one machine circuit, and charge it with refrigerant;

[0007] The four-way valve has two operating positions: a cooling cycle position and a heating cycle position; In the refrigeration cycle position, ports 1 and 3 of the four-way valve are connected, and ports 2 and 4 are connected. In the heating cycle position, ports 1 and 2 of the four-way valve are connected, and ports 3 and 4 are connected.

[0008] The three-in-one unit, through the switching of the four-way valve and the different throttles in the throttle assembly, can automatically select the liquid flow path and block the airflow according to the characteristics of the throttles, thus forming the following four refrigerant circulation loops: (1) First hot water production circulation loop: Compressor outlet → Hot water heat exchanger (heat release) → Y-type three-way connector 1st and 3rd interface passage → Second throttle → Indoor heat exchanger (heat absorption) → Four-way valve 2nd and 4th interface passage → Liquid receiver → Compressor inlet; (2) Second hot water production circulation loop: Compressor outlet → Hot water heat exchanger (heat release) → Y-type three-way connector 1st and 3rd interface passage → First throttle valve → Outdoor heat exchanger (heat absorption) → Four-way valve 3rd and 4th interface passage → Liquid receiver → Compressor inlet; (3) Heating and heating circulation loop: compressor outlet → hot water heat exchanger → Y-type three-way connector 1st and 2nd interface passage → four-way valve 1st and 2nd interface passage → indoor heat exchanger (heat release) → third throttle valve → outdoor heat exchanger (heat absorption) → four-way valve 3rd and 4th interface passage → liquid receiver → compressor inlet; (4) Refrigeration and air conditioning circulation loop: compressor outlet → hot water heat exchanger → Y-type three-way connector 1st and 2nd interface passage → four-way valve 1st and 3rd interface passage → outdoor heat exchanger (heat release) → fourth throttle and one-way valve → indoor heat exchanger (heat absorption) → four-way valve 2nd and 4th interface passage → liquid receiver → compressor inlet.

[0009] The indoor air conditioning and heating heat exchange system of the system is an indoor heat exchange system associated with the indoor heat exchanger of the three-in-one unit; based on the heat exchange mode of the indoor heat exchanger, the following two indoor heat exchange loops are configured: When the indoor heat exchanger is a refrigerant-air heat exchanger, the fan equipped with the indoor heat exchanger is used to blow air for heat exchange, forming an indoor air circulation heat exchange loop. When the indoor heat exchanger is a refrigerant-water heat exchanger, it together with multiple parallel indoor water-air fan coil heat exchangers, circulating water pumps, and buffer water tanks or cold / hot water storage tanks to form an indoor water circulation heat exchange loop. The indoor water circulation heat exchange circuit is as follows: circulating water pump outlet → refrigerant-water indoor heat exchanger → multiple water-air fan coil heat exchangers → return water tank → circulating water pump inlet; All indoor water-fan coil heat exchangers are equipped with temperature sensors and crossflow fans.

[0010] The hot water preparation and supply system is a hot water circulation system associated with the hot water heat exchanger of the three-in-one machine; it includes: a hot water heat exchanger, a hot water circulation pump, a hot water tank, a one-way valve, and a three-way valve; The three-way valve is configured to switch between hot water preparation and supply and dehumidification and heat replenishment supply; The hot water tank can be a pressurized tank or a non-pressurized tank; the pressurized tank is equipped with a pressure relief valve on its inlet pipe, and uses tap water to pressurize and dispense hot water; the non-pressurized tank is installed at a position higher than the user's hot water tap and is equipped with a water level gauge to control the water level; the hot water tank is equipped with a water level probe. The hot water circulation system includes a hot water heat exchanger that provides domestic hot water through a forced hot water circulation loop or a natural convection hot water heat exchange loop; The hot water heat exchanger in the forced hot water circulation loop is a plate heat exchanger, a shell-and-tube heat exchanger, or a coaxial heat exchanger. The hot water heat exchanger of the natural convection hot water heat exchange circuit is a combined hot water tank heat exchanger with built-in spiral coil. Hot water is produced by natural convection heat exchange and hot water is produced by pressing tap water. The hot water tank is a pressurized water tank. The forced hot water circulation loop is as follows: hot water circulation pump outlet → hot water heat exchanger → three-way valve port 1 and 2 → hot water tank → check valve → hot water circulation pump inlet.

[0011] The dehumidification and heat replenishment hot water system is a heat replenishment hot water circulation system that combines the hot water heat exchanger and the heat replenishment heat exchanger of the three-in-one machine; the heat replenishment heat exchanger is a specially designed hot water radiator that uses hot water to supply heat to the room. The hot water circulation loop is as follows: hot water circulation pump outlet → hot water heat exchanger → three-way valve 1st and 3rd port passage → hot water heat exchanger → hot water tank → one-way valve → hot water circulation pump inlet.

[0012] The system utilizes the four refrigerant cycles of the three-in-one unit, the forced hot water circulation loop of the hot water preparation and supply system, and the supplementary heating loop using an indoor heat exchanger to supplement indoor heating. It is configured with seven operating modes to meet customers' needs for air conditioning, heating, hot water, and dehumidification / heat supplementation under different ambient temperatures and water temperatures. The seven operating modes and their operating states are as follows: (1) First hot water production mode: suitable for occasions where the indoor temperature is higher than 25℃ in summer and cooling and domestic hot water production are required; In this mode, the three-in-one machine operates the first hot water production circulation loop, and the forced hot water circulation loop is in operation; The compressor, indoor fan, and hot water circulation pump are all running, while the outdoor fan is stopped. The four-way valve is in the refrigeration circulation position, and the three-way valve of the water circuit is in the first and second interface passages. The indoor heat exchanger acts as an evaporator to absorb heat from the indoor air, and the hot water heat exchanger acts as a condenser to produce hot water. The hot water is stored in the hot water tank. (2) Second hot water production mode: suitable for occasions in spring and autumn when there is no need for air conditioning and heating but domestic hot water needs to be produced; In this mode, the three-in-one machine operates the second hot water production circulation loop; the forced hot water circulation loop is in operation. The compressor, outdoor fan, and hot water circulation pump are all running, while the indoor fan is stopped. The four-way valve is in the heating circulation position, and the three-way valve of the water circuit is in the first and second interface passages. The outdoor heat exchanger acts as an evaporator to absorb heat from the outdoor air, and the hot water heat exchanger acts as a condenser to produce hot water, storing the heat in the hot water tank. (3) Heating mode: suitable for indoor temperatures below 18℃ during winter heating; In this mode, the three-in-one unit operates the heating and warming circulation loop; the indoor air conditioning heating and heat exchange system of the system is in operation; and the supplementary hot water circulation loop is in operation. The compressor, outdoor fan, indoor fan, and hot water circulation pump are all in operation; the four-way valve is in the heating circulation position, and the three-way valve of the water circuit is in the 1st and 3rd interface passage; the outdoor heat exchanger is used as an evaporator, the indoor heat exchanger is used as a condenser to release heat for heating; the hot water heat exchanger is used as a condenser to release heat to produce hot water, and the supplementary heat exchanger is used as a radiator to release heat to supplement heating. (4) Cooling and air conditioning mode: suitable for situations where the hot water tank temperature has reached the standard in summer and the indoor air conditioning is required; In this mode, the three-in-one unit operates a refrigeration and air conditioning circulation loop; the indoor air conditioning and heating heat exchange system of the system is in operation. The compressor, outdoor fan, and indoor fan are all running; the hot water circulation pump is stopped; the four-way valve is in the refrigeration circulation position; the three-way valve of the water circuit is in the first and second interface passages; the outdoor heat exchanger is used as a condenser to release heat; the indoor heat exchanger is used as an evaporator to absorb indoor air heat energy for refrigeration; the hot water heat exchanger has no heat exchange, and the supplementary heat exchanger has no heat exchange. (5) Reverse circulation defrosting mode: This mode is activated during heating and warming processes when severe frost buildup on the outdoor heat exchanger causes a sharp drop in compressor suction pressure. In this mode, the refrigerant circulation path of the three-purpose machine is the same as that of the refrigeration air conditioner circulation loop, and the forced hot water circulation loop is in operation; The compressor is running, the outdoor fan is stopped, the indoor fan is stopped; the hot water circulation pump is running; the four-way valve is in the refrigeration circulation position, and the three-way valve of the water circuit is in the first and second interface passages; the outdoor heat exchanger is used as a condenser and is being defrosted, the indoor heat exchanger is not exchanging heat; the hot water heat exchanger is exchanging heat, the hot water in the hot water tank is releasing heat, and the supplementary heat exchanger is not exchanging heat. (6) Dehumidification and heating mode: suitable for situations where the indoor relative humidity is greater than 60% in spring and dehumidification is required to prevent the indoor temperature from being too low; In this mode, the three-in-one machine operates the first hot water production circulation loop and the hot water replenishment circulation loop; The compressor is running at low speed, the outdoor fan is running at low speed, and the indoor fan is stopped; the hot water circulation pump is running; the four-way valve is in the refrigeration circulation position, and the three-way valve of the water circuit is in the 1st and 3rd interface passage; the outdoor heat exchanger is not exchanging heat, and the indoor heat exchanger is used as an evaporator to absorb heat, condense moisture, and dehumidify; the hot water heat exchanger is exchanging heat, and the heat exchanger is in the heat release and heat replenishment position. (7) Surplus electricity grid connection mode: During the daytime when the hot water and air conditioning heating tri-function machine is not needed and the household appliance load is relatively low, the photovoltaic power system will transmit the surplus photovoltaic electricity to the municipal power grid.

[0013] The main innovative points of this invention are: 1. Coupling photovoltaic power supply with a multi-purpose generator for the scientific utilization of solar energy. This invention proposes a four-in-one power supply system coupling photovoltaic power and a three-in-one water heater, organically combining photovoltaic power generation technology with a three-in-one water heater to achieve synergistic utilization of electricity and heat energy. The system supplies power to the three-in-one water heater via photovoltaic power, which absorbs low-grade air energy to produce heat for heating or hot water production. The heat obtained is far greater than the electricity consumed by the three-in-one water heater, and its hot water production efficiency is higher than that of a solar water heater with the same irradiance area. This invention achieves a doubling of energy utilization and comprehensive benefits compared to solar water heaters. In summer, when operating in cooling and hot water production mode, its coefficient of performance (COP) can exceed 6.5. In spring and autumn, the three-in-one water heater is used as a heat pump water heater, absorbing outdoor air energy to produce hot water, achieving 70% energy savings compared to electric water heaters. The three-in-one water heater can provide hot water at any time. During non-air conditioning seasons, surplus electricity can be output to the municipal power grid, achieving net electricity export, allowing users to enjoy cooling, heating, and hot water services while obtaining economic benefits and approaching zero carbon emissions.

[0014] 2. Innovative Structure and Multifunctional Cyclic Function of the Three-in-One Machine This invention relates to a three-in-one unit that combines cooling / air conditioning, heating, and all-weather hot water supply with a simple structure. Its key structural features include: a hot water heat exchanger added to the compressor exhaust port, with simple gas-liquid separation achieved via a Y-type three-way connector; the liquid outlet is connected to the indoor or outdoor heat exchanger via two expansion valves; this structure automatically selects the evaporator path without requiring additional control valves, allowing the unit to produce hot water in both cooling and heat pump modes while retaining all the functions of a traditional air conditioner; the system has four refrigerant circulation loops, with the cooling / hot water circulation loop showing particularly significant energy-saving effects, as demonstrated by excellent prototype testing.

[0015] 3. The system functionality has been expanded by adding a dehumidification and heating system. A refrigerant circulation loop that simultaneously cools and heats the room can supply hot water obtained from the hot water heat exchanger to the dehumidification and heat replenishment system, which in turn replenishes the room. In the cold and damp weather of spring, indoor dehumidification and heat replenishment can be achieved simultaneously. This process does not require additional energy consumption and can also handle part of the heating load in winter, significantly enhancing the system's practicality and energy efficiency throughout the year.

[0016] 4. Employs highly efficient and energy-saving reverse defrosting technology: Addressing the defrosting challenges of multi-purpose air source heat pumps during winter operation, this invention employs an innovative reverse defrosting method. Its unique feature is that the heat required for defrosting is directly derived from the system's self-generated heat energy stored in the hot water heat exchanger and hot water tank, rather than through traditional external electric heating or reverse circulation heat absorption. This method offers advantages such as fast and thorough defrosting, and low energy consumption, significantly improving the stability and energy efficiency of the air source heat pump during winter heating operation.

[0017] 5. Provides a cost-effective solution for centralized scenarios: When using a refrigerant-water indoor heat exchanger, this system can be expanded into a central air conditioning system suitable for collective apartments such as schools and hotels. The system consists of a refrigerant-water heat exchanger and fan coil units in multiple rooms, forming an indoor water circulation system to achieve centralized cooling and heating. According to preliminary cost-benefit analysis, this system can save about 50% in equipment costs compared to the traditional solution of "solar collector + air source heat pump + independent air conditioner". In terms of operation, cooling in summer is almost free, and electricity can be sold to the grid in spring and autumn. The annual average grid power consumption is expected to be close to zero, achieving a combination of cooling, heating, and power supply. It is a model for practicing the green concept of "local consumption of new energy" and "consumption as financial management".

[0018] In summary, the photovoltaic power supply and three-in-one machine coupling quad-power system proposed in this invention constructs a brand-new solar energy efficient utilization system through multi-energy complementarity and system integration; seven energy-saving operation modes have been developed to meet the needs of customers for air conditioning, heating and hot water, as well as dehumidification and heat replenishment under different ambient air temperature and water temperature; the system has the following significant advantages: (1) saving power transmission loss over long distances and alleviating the peak load pressure on the power grid; (2) the efficiency and cost of hot water production are better than traditional solar water heaters; (3) the comprehensive performance coefficient (COP) under the cooling and hot water production conditions can exceed 6.5; (4) when the three-in-one machine is idle in spring and autumn, the photovoltaic power supply system can transmit power to the power grid, which is expected to achieve energy self-balancing and zero carbon emissions throughout the year, so that users can enjoy a comfortable environment in all aspects and may obtain additional economic returns.

[0019] As stated above, the four-in-one power supply system coupled with a photovoltaic power source and a three-in-one generator of this application has outstanding inventiveness, novelty and practicality, and meets the conditions for granting a national invention patent. Attached Figure Description

[0020] An embodiment of a quad-power system of the present invention, which couples a photovoltaic power source with a three-in-one generator, is illustrated in the following figures. Figure 1 This is a structural schematic diagram and a working principle illustration diagram of Embodiment 1 of the system described in this invention; Figure 2 This is a schematic diagram of the structure and working principle of the system embodiment 2 of the present invention, characterized in that the indoor air conditioning heating heat exchange system is an indoor water heat exchange circuit.

[0021] The structure and working principle of a photovoltaic power supply coupled with a three-in-one generator system according to the present invention will be further described below with reference to the embodiments and accompanying drawings. However, the scope of protection of the present invention is not limited to the embodiments shown in the accompanying drawings. Detailed Implementation

[0022] Example 1 Figure 1 The figure shown is a four-in-one power supply system of the present invention, which is coupled with a photovoltaic power source and a three-in-one machine. The system mainly includes a photovoltaic power input system, a three-in-one machine and its indoor air conditioning, heating and hot water three-in-one system, a hot water system and a dehumidification and heat replenishment system. Figure 1 In the diagram, dashed box A represents the photovoltaic power input system, dashed box B represents the outdoor unit system of the three-in-one unit, and dashed box C represents the indoor unit of the three-in-one unit and its supporting air conditioning and heating indoor heat exchange systems. like Figure 1 As shown, the photovoltaic power input system is a combined photovoltaic power supply system with the municipal power grid, used to provide power to multi-purpose appliances and other electrical appliances of the user. The system includes a photovoltaic module array as a power generation unit, a DC combiner box and grid-connected inverter as power collection and conversion units, an AC distribution box / grid-connected box, a bidirectional meter, and a municipal power grid interface as grid-connected and distribution units, and a main household distribution box as the household power supply interface. It also includes auxiliary materials such as DC / AC cables and connectors. The system connection sequence is as follows: DC-side power generation process: Photovoltaic module (8) → DC cable → DC combiner box → DC input terminal of grid-connected inverter; Inverter and grid connection process: AC output terminal of grid-connected inverter → AC distribution box / grid-connected box → bidirectional meter → municipal power grid; Home power supply connection: Lead a cable from the AC distribution box / grid-connected box to the load side of the main circuit breaker in the home's main distribution box; this connection method ensures that photovoltaic power generation is given priority to home loads, and excess power can be fed into the public power grid.

[0023] like Figure 1As shown, the three-in-one machine consists of three heat exchangers: a compressor (1), a hot water heat exchanger (2), an indoor heat exchanger (5), and an outdoor heat exchanger (6), a four-way valve (4), a liquid receiver (7), a throttle assembly, and a Y-type three-way connector (3) for gas-liquid separation, which are connected by pipelines to realize four refrigerant circulation loops. The indoor heat exchanger is a refrigerant-air indoor heat exchanger (5) with an indoor fan (5a); the outdoor heat exchanger is an air-source outdoor heat exchanger (6) with an outdoor fan (6a). The hot water heat exchanger is a plate heat exchanger, a tank-type spiral tube heat exchanger, or a shell-and-tube heat exchanger, or an integrated hot water heat exchanger with a coil heat exchanger inside the hot water tank. The connection method of the three-in-one machine is as follows: the air outlet of the compressor is connected to the inlet of the hot water heat exchanger; the hot water heat exchanger is installed vertically, and its outlet is connected to the first interface of the two upper ports of the vertically installed Y-type tee connector; the Y-type tee connector serves as a gas-liquid separator at the outlet of the hot water heat exchanger, and its upper second interface is the air outlet connected to the first interface inlet of the four-way valve; the lower third interface of the Y-type tee connector is connected to the first throttling interface of the throttling device assembly. The throttling assembly consists of a first, second, third and fourth throttling device (J1, J2, J3, J4) and a one-way valve D1. It has three throttling ports, which are marked as the first, second and third throttling ports (①, ②, ③) respectively, and are connected to the condensate outlets of the hot water heat exchanger (2), the outdoor heat exchanger (6) and the indoor heat exchanger (5) respectively. The first throttling port (①) is the parallel port of the liquid inlet of the first throttling device (J1) and the second throttling device (J2), and is connected to the third port of the Y-type tee connector (3); the third port of the Y-type tee connector (3) is the actual outlet of the condensate of the heat exchanger. The second throttling interface (②) is connected to the liquid flow port of the outdoor heat exchanger (6) and is the common port for the liquid flow outlet of the first throttling device (J1) and the third throttling device (J3) and the liquid inlet of the fourth throttling device (J4). The third throttling interface (③) connects to the liquid flow port of the indoor heat exchanger (5) and is the common port for the liquid flow outlet of the second throttling device (J2) and the fourth throttling device (J4) and its directional check valve D1, as well as the liquid inlet of the third throttling device (J3). The four-way valve (4) has four ports (①, ②, ③, ④) and two working positions (refrigeration cycle position and heating cycle position); among them, the second and third ports (②, ③) are connected to the airflow ports of the indoor heat exchanger (5) and the outdoor heat exchanger (6) respectively, and the fourth port (④) is a low-pressure return port connected to the liquid receiver; the outlet of the liquid receiver (7) is connected to the compressor suction port; When the four-way valve (4) is in the refrigeration cycle position, the first port is connected to the third port (①, ③), and the second port is connected to the fourth port (②, ④). When in the heating cycle position, the first interface is connected to the second interface (①, ②), and the third interface is connected to the fourth interface (③, ④). Connect the pipes as described above to form the three-in-one machine circuit and charge it with refrigerant.

[0024] The three-in-one unit has the following four refrigerant circulation loops, corresponding to four working modes, through the working position switching of the four-way valve and the on / off combination of different throttles in the throttle assembly; See Figure 1 The four refrigerant circulation loops of the three-in-one machine are as follows: (1) First hot water production circulation loop (applicable to the first hot water production mode of summer air conditioning and hot water): Compressor (1) outlet → Hot water heat exchanger (2) (heat release) → Y-type three-way connector (3) 1st and 3rd interface passages (①, ③) → Second throttle (J2) → Indoor heat exchanger (5) (heat absorption) → Four-way valve (4) 2nd and 4th interface passages (②, ④) → Liquid receiver (7) → Compressor (1) inlet; Explanation: Although there is compressor exhaust in the Y-type three-way connector (3) 1 and 2 interface passages, four-way valve (4) 1 and 3 interface passages and outdoor heat exchanger (6) pipeline, there is no refrigerant flow in the pipeline because the outdoor fan (6a) is not running and the first, third and fourth throttles block the high pressure gas of the outdoor heat exchanger. Therefore, it is considered that there is no heat exchange. (2) Second hot water production circulation loop (applicable to the second hot water production mode in spring, autumn and summer): Compressor (1) outlet → Hot water heat exchanger (2) (heat release) → Y-type three-way connector (3) 1st and 3rd interface passages (①, ③) → First throttle (J1) → Outdoor heat exchanger (6) (heat absorption) → Four-way valve (4) 3rd and 4th interface passages (③, ④) → Liquid receiver (8) → Compressor (1) inlet; Explanation: Although there is compressor exhaust in the indoor heat exchanger (5) pipeline, because the indoor fan (5a) is not running and the second, third and fourth throttles block the high-pressure gas of the indoor heat exchanger, there is no refrigerant flow in the pipeline and no heat exchange. (3) Heating and heating circulation loop (applicable to winter heating mode): Compressor outlet → Hot water heat exchanger → Y-type three-way connector, ports 1 and 2 → Four-way valve, ports 1 and 2 → Indoor heat exchanger (heat release) → Third throttle (J3) → Outdoor heat exchanger (heat absorption) → Four-way valve, ports 3 and 4 → Liquid receiver → Compressor inlet; Note: In addition to blowing hot air directly into the room through the refrigerant-air indoor heat exchanger, heating can also be assisted through a supplementary hot water circulation loop; (4) Refrigeration and air conditioning circulation loop (applicable to single refrigeration mode): compressor outlet → hot water heat exchanger → Y-type three-way connector 1st and 2nd interface passage → four-way valve 1st and 3rd interface passage outdoor heat exchanger (6) (heat release) → fourth throttle (J4) → one-way valve (D1) → indoor heat exchanger (5) (heat absorption) → four-way valve 2nd and 4th interface passage → liquid receiver → compressor inlet.

[0025] See Figure 1 The hot water preparation and supply system of the system is a hot water circulation system associated with the hot water heat exchanger of the three-in-one machine, which consists of a hot water heat exchanger (2), a hot water circulation pump (B1), a hot water tank (11), a one-way valve (D2), a three-way valve (12), and is connected by pipelines. The three-way valve (12) is configured to switch between hot water preparation supply and dehumidification and heat replenishment supply; The hot water tank in Example 1 is a non-pressurized water tank, installed at a position higher than the user's hot water tap, and equipped with a water level gauge to control the water level; the hot water tank is equipped with a water level probe (G1). The system has two hot water circulation loops, and their connections and circulation loops are as follows: The first type of forced circulation hot water circuit for hot water heat exchanger is: hot water circulation pump (B1) outlet → hot water heat exchanger (2) → three-way valve (12) 1st and 2nd ports (①, ②) passage → hot water tank (11) → one-way valve (D2) → hot water circulation pump (B1) inlet; The second type is a supplementary hot water circulation loop: hot water circulation pump (B1) outlet → hot water heat exchanger (2) → three-way valve (12) 1st and 3rd ports (①, ③) passage → supplementary heat exchanger (13) → hot water tank (11) → one-way valve (D2) → hot water circulation pump (B1) inlet.

[0026] The system utilizes the four refrigerant cycles of the three-in-one unit, the forced circulation loop of the hot water preparation and supply system, and the supplementary hot water circulation loop using an indoor supplementary heat exchanger to provide supplementary heating to the room. It is configured with seven operating modes to meet customers' needs for air conditioning, heating, hot water, and dehumidification supplementary heating under different ambient temperatures and water temperatures. The seven operating modes and their operating states are as follows: (1) First hot water production mode: suitable for situations where the indoor temperature (T1) is higher than 25℃ in summer and cooling is required, and the water temperature in the hot water storage tank (T3) is lower than the set lower limit T3a, and domestic hot water needs to be produced. In this mode, the three-in-one machine operates the first hot water production circulation loop, and the forced hot water circulation loop is in operation; the compressor (1), indoor fan (5a), and hot water circulation pump (B1) are all in operation, and the outdoor fan (6a) is in a stopped state; the four-way valve (2) is in the refrigeration circulation position, and the three-way valve (12) of the water circuit is in the first and second interface passages; the indoor heat exchanger (5) is used as an evaporator to absorb the heat energy of the indoor air, and the hot water heat exchanger (2) is used as a condenser to release heat to produce hot water, and the hot water is stored in the hot water tank (11). When the water temperature (T3) in the hot water storage tank reaches the set upper limit T3b, the hot water circulation pump stops; the system switches to cooling and air conditioning mode. (2) This mode of air conditioning is suitable for situations where the room temperature (T1) is higher than 25°C in summer; This mode operates the refrigeration and air conditioning circulation loop; the compressor, indoor fan, and outdoor fan are running; the four-way valve is in the refrigeration circulation position; the three-in-one unit stops operating when the indoor temperature (T1) is lower than the lower limit of the indoor air conditioning set temperature. (3) Second hot water production mode: suitable for occasions where domestic hot water is needed in spring and autumn but indoor air conditioning and heating are not required; when the water temperature (T3) of the hot water storage tank is lower than the set lower limit T3a, and the room temperature is in the range of 18-26℃, this mode is activated; In this mode, the second hot water production circulation loop is activated; the forced hot water circulation loop is in operation. The compressor, outdoor fan, and hot water circulation pump are all running, while the indoor fan is stopped; the four-way valve is in the heating circulation position, and the three-way valve of the water circuit is in the first and second interface passages; the outdoor heat exchanger is used as an evaporator, the hot water heat exchanger is used as a condenser, and the heat is stored in the hot water tank. (4) Surplus electricity grid connection mode: In spring and autumn, when the indoor temperature is between 18-25℃, the water temperature (T3) of the hot water tank reaches the set upper limit T3b, and the three-in-one machine stops running; the system automatically switches to surplus electricity grid connection mode. In this mode, the photovoltaic power input system feeds surplus electricity into the grid through the bidirectional meter of the grid-connected inverter and the grid connection terminal. (5) Heating mode: This mode is activated when the indoor temperature is below 18°C ​​during winter heating. In this mode, the three-in-one unit operates the heating and warming circulation loop; the indoor air conditioning heating and heat exchange system of the system is in operation; and the supplementary hot water circulation loop is in operation. The compressor, outdoor fan, indoor fan, and hot water circulation pump are all in operation; the four-way valve is in the heating circulation position, and the three-way valve of the water circuit is in the 1st and 3rd interface passage; the outdoor heat exchanger is used as an evaporator, the indoor heat exchanger is used as a condenser to release heat for heating; the hot water heat exchanger is used as a condenser to release heat to produce hot water, and the supplementary heat exchanger is used as a radiator to release heat to supplement heating. (6) Reverse circulation defrosting mode: This mode is activated when the outdoor heat exchanger is severely frosted during the heating and warming operation, causing a sharp drop in the compressor suction pressure. In this mode, the four-way valve switches to the refrigeration cycle position; the refrigerant circulation path of the three-way machine is the same as that of the refrigeration air conditioner circulation loop, and the forced hot water circulation loop is in operation; The compressor is running, but the outdoor fan and indoor fan are stopped; the hot water circulation pump is running; the three-way valve of the water circuit is in the first and second interface passages; the hot water heat exchanger absorbs the heat of the hot water and transfers it to the outdoor heat exchanger, which acts as a condenser and is defrosted; the indoor heat exchanger does not exchange heat. (7) Dehumidification and heating mode: suitable for situations where the indoor relative humidity is greater than 60% in spring and dehumidification is required to prevent the indoor temperature from being too low; In this mode, the three-in-one machine operates the first hot water production circulation loop and the hot water replenishment circulation loop; The compressor is running at low speed, the outdoor fan is running at low speed, and the indoor fan is stopped; the hot water circulation pump is running; the four-way valve is in the refrigeration circulation position, and the three-way valve of the water circuit is in the 1st and 3rd interface passage; the outdoor heat exchanger is not exchanging heat, the indoor heat exchanger is used as an evaporator, and is in the process of absorbing heat, cooling and dehumidifying; the hot water heat exchanger is exchanging heat, and the heat exchanger is in the process of releasing heat and replenishing heat.

[0027] Example 2 Figure 2 This is a schematic diagram of the structure of a four-in-one power supply system coupled with a photovoltaic power source and a three-in-one unit according to the present invention; the three-in-one unit's composition and the two hot water circulation loops of the hot water preparation and supply system are the same as those in Example 1. The characteristic feature is that the indoor heat exchanger of the three-in-one unit in Example 3 is a refrigerant-water heat exchanger; its indoor heat exchange system is an indoor water circulation heat exchange system composed of a refrigerant-water heat exchanger and multiple indoor water-fan coil heat exchangers. This is a water circulation heat exchange system for central air conditioning chilled water or heating hot water, and its circulation loop is as follows: Circulating water pump (B2) outlet → refrigerant-water chamber heat exchanger (5) → multiple water-air coil fans (14, 15, ...) → return water tank (16) → circulating water pump (B2) inlet; Figure 2 The diagram illustrates a heating loop where heat is exchanged using a hot water heat exchanger and stored in a hot water tank, then released through an indoor supplementary heat exchanger for heating. (See [link to relevant documentation]). Figure 2 As shown by the hollow arrow in the image: The hot water circulation loop is as follows: hot water circulation pump (B1) outlet → hot water heat exchanger (2) → three-way valve (12) 1st and 3rd ports (①, ③) passage → hot water heat exchanger (13) → hot water tank (11) → one-way valve (D2) → hot water circulation pump (B1) inlet.

Claims

1. A quadruple supply system coupled with a three-purpose machine, comprising: a photovoltaic power supply input system for supplying photovoltaic power to user loads and uploading the remaining power to a power grid; a cold, warm and hot water three-purpose machine, referred to as a three-purpose machine, electrically connected to the photovoltaic power supply input system, for providing heat to users for heating and heating domestic hot water by absorbing air energy, or for air conditioning and heating domestic hot water by absorbing indoor air energy; an indoor air conditioning, heating and heat exchange system for transmitting the cold or heat generated by the three-purpose machine to indoor air to achieve air conditioning or heating; a hot water preparation and supply system for heating domestic hot water by the heat generated by the three-purpose machine and providing domestic hot water supply; a dehumidification and heat supply hot water system for expanding the domestic hot water to a dehumidification process to supply heat to a room; and a signal detection, processing and execution system for controlling the start and stop of related devices in the system according to detection signals and set operation mode parameters.

2. The system according to claim 1, wherein the photovoltaic power supply system is a photovoltaic and power grid connected system, comprising photovoltaic module arrays, a direct current combiner box, a grid-connected inverter, an alternating current distribution box / grid-connected box and a bidirectional metering electric meter connected in sequence, and the output end of the alternating current distribution box / grid-connected box is connected to a user household total distribution box.

3. The system according to claim 1, wherein the three-purpose machine comprises a compressor, a hot water heat exchanger, an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, a liquid accumulator, a restrictor assembly and a Y-shaped three-way joint; the three-purpose machine is connected in the following manner: the gas outlet of the compressor is connected to the inlet of the hot water heat exchanger; the hot water heat exchanger is vertically installed, and the outlet thereof is connected to the first port of the upper two ports of the Y-shaped three-way joint which is also vertically installed; the Y-shaped three-way joint serves as a gas-liquid separator of the hot water heat exchanger outlet, and the second port of the upper portion thereof is connected to the first gas inlet port of the four-way valve; the third port of the liquid outlet of the lower portion of the Y-shaped three-way joint is connected to the first throttling port of the restrictor assembly; the restrictor assembly is composed of first, second, third and fourth restrictors and one-way valves, and has first, second and third throttling ports; the first throttling port is a parallel port of the liquid inlets of the first and second restrictors, and is connected to the third port of the Y-shaped three-way joint (liquid outlet); the second throttling port is a common port of the liquid outlets of the first and third restrictors and the liquid inlet of the fourth restrictor, and is connected to the liquid port of the outdoor heat exchanger; the third throttling port is a common port of the liquid outlets of the second and fourth restrictors and the one-way valves and the liquid inlet of the third restrictor, and is connected to the liquid port of the indoor heat exchanger; the four-way valve has four ports, i.e., the first, second, third and fourth ports, which are respectively connected to the second port of the Y-shaped three-way joint, the gas inlet of the indoor heat exchanger, the gas inlet of the outdoor heat exchanger and the gas inlet of the liquid accumulator; the outlet of the liquid accumulator is connected to the suction port of the compressor; the three-purpose machine circuit is formed by connecting the above-mentioned pipes and is filled with refrigerant; the four-way valve has two working positions, i.e., a refrigeration cycle position and a heating cycle position. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ In the refrigeration cycle position, the first and third interfaces of the four-way valve are connected, and the second and fourth interfaces are connected; In the heating cycle position, the first and second interfaces of the four-way valve are connected, and the third and fourth interfaces are connected.

4. The system of claim 3, wherein: The three-in-one machine can automatically select the liquid flow path and block the gas flow path according to the characteristics of the different throttles through the switching of the four-way valve and the throttling assembly, and form the following four refrigerant circulation loops: (1) The first hot water preparation circulation loop: compressor outlet → hot water heat exchanger (heat release) → Y-shaped three-way joint first and third interface path → second throttle → indoor heat exchanger (heat absorption) → four-way valve second and fourth interface path → liquid accumulator → compressor inlet; (2) The second hot water preparation circulation loop: compressor outlet → hot water heat exchanger (heat release) → Y-shaped three-way joint first and third interface path → first throttle → outdoor heat exchanger (heat absorption) → four-way valve third and fourth interface path → liquid accumulator → compressor inlet; (3) The heating and cooling circulation loop: compressor outlet → hot water heat exchanger → Y-shaped three-way joint first and second interface path → four-way valve first and second interface path → indoor heat exchanger (heat release) → third throttle → outdoor heat exchanger (heat absorption) → four-way valve third and fourth interface path → liquid accumulator → compressor inlet; (4) The refrigeration and air conditioning circulation loop: for single refrigeration in summer: compressor outlet → hot water heat exchanger → Y-shaped three-way joint first and second interface path → four-way valve first and third interface path → outdoor heat exchanger (heat release) → fourth throttle and check valve → indoor heat exchanger (heat absorption) → four-way valve second and fourth interface path → liquid accumulator → compressor inlet.

5. The system of claim 1 or claim 3, wherein: The indoor air conditioning and heating heat exchange system of the system is an indoor heat exchanger associated indoor heat exchange system of the three-in-one machine; according to the heat exchange form of the indoor heat exchanger, the following two indoor heat exchange loops are configured: When the indoor heat exchanger is a refrigerant-air heat exchanger, an indoor air circulation heat exchange loop is directly used by the fan blowing heat exchange of the indoor heat exchanger; When the indoor heat exchanger is a refrigerant-water heat exchanger, it and multiple parallel indoor water-air fan coil heat exchangers, a circulating water pump, and a buffer water tank or a cold storage / heat storage water tank together form an indoor water circulation heat exchange loop; The indoor water circulation heat exchange loop is: circulating water pump outlet → refrigerant-water indoor heat exchanger → multiple water-air fan coil heat exchangers → return water tank → circulating water pump inlet; The indoor water-air fan coil heat exchangers are each provided with a temperature sensor and a cross-flow fan.

6. The system of claim 1 or claim 3, wherein: The hot water preparation and supply system of the system is a hot water circulation system associated with the hot water heat exchanger of the three-in-one machine, and includes a hot water heat exchanger, a hot water circulation pump, a hot water tank, a check valve, and a three-way valve. The three-way valve is configured to switch between hot water preparation supply and dehumidification and heat supply. The hot water tank is a pressure-bearing water tank or a non-pressure-bearing water tank; the pressure-bearing water tank is provided with a pressure relief valve on a water inlet pipeline, and hot water is discharged by using tap water to press; the non-pressure-bearing water tank is installed at a position higher than that of a hot water faucet of a user and is provided with a water level meter to control the water level; the hot water tank is provided with a water level probe. The hot water circulation system comprises a hot water heat exchanger which provides domestic hot water through a forced hot water circulation loop or a natural convection hot water heat exchange loop. The hot water heat exchanger of the forced hot water circulation loop is a plate heat exchanger, a shell-and-tube heat exchanger or a jacketed tube heat exchanger. The hot water heat exchanger of the natural convection hot water heat exchange loop is a hot water tank integrated heat exchanger with an internal spiral coil, and hot water is prepared by natural convection heat exchange and discharged by using tap water to press; the hot water tank is a pressure-bearing water tank. The forced hot water circulation loop is: hot water circulation pump outlet → hot water heat exchanger → three-way valve first and second interface passages → hot water tank → one-way valve → hot water circulation pump inlet.

7. The system according to claim 1 or claim 3, characterized in that: The dehumidification and heat supply hot water system of the system is a dehumidification and heat supply hot water circulation system composed of a hot water heat exchanger and a heat supply heat exchanger of the three-in-one machine; the heat supply heat exchanger is a special hot water radiator for supplying hot water to the room; The heat supply hot water circulation loop is: hot water circulation pump outlet → hot water heat exchanger → three-way valve first and third interface passages → heat supply heat exchanger → hot water tank → one-way valve → hot water circulation pump inlet.

8. The system according to claim 1 or claim 3, characterized in that: The system utilizes four refrigerant circulation loops of the three-in-one machine, and the forced hot water circulation loop and the heat supply hot water circulation loop of the hot water preparation supply system are configured with seven operation modes to meet the needs of customers for air conditioning, heating and hot water and dehumidification and heat supply in different environmental temperatures and water temperatures; the seven operation modes and their operation states are as follows: (1) First hot water preparation mode: operated when the indoor temperature is higher than 25℃ and hot water is needed in summer and the water temperature of the hot water tank is lower than the set lower limit value; In this mode, the first hot water preparation circulation loop and the forced hot water circulation loop are operated; the compressor, the indoor fan and the hot water circulation pump are in the running state, and the outdoor fan is in the stopped state; the four-way valve is in the refrigeration cycle position, and the three-way valve of the water circuit is in the first and second interface passages; The indoor heat exchanger is used as an evaporator to absorb the heat of indoor air, and the hot water heat exchanger is used as a condenser to release heat to prepare hot water, and the hot water is stored in the hot water tank; (2) Second hot water preparation mode: operated in spring and autumn when the room temperature is in the range of 18-25℃ and air conditioning and heating are not needed, but the water temperature of the hot water tank is lower than the set lower limit value; In this mode, the second hot water preparation circulation loop and the forced hot water circulation loop are in the running state; The compressor, outdoor fan, hot water circulating pump are in running state, indoor fan is in stop state; four-way valve is in heating cycle position, waterway three-way valve is in the first, second interface access; outdoor heat exchanger as evaporator, hot water heat exchanger as condenser, heat storage in hot water tank; (3) heating mode: suitable for winter heating indoor temperature below 18℃; In this mode, the heating cycle circuit is operated; indoor air circulation heat exchange circuit or water circulation heat exchange circuit is operated; the heat supplement hot water circulation circuit is also in running state; The compressor, outdoor fan, indoor fan, hot water circulating pump are in running state; four-way valve is in heating cycle position, waterway three-way valve is in the first, third interface access; outdoor heat exchanger as evaporator, indoor heat exchanger as condenser for heat release heating; hot water heat exchanger as condenser for heat release hot water, heat supplement heat exchanger as radiator for heat release to supplement heating; (4) refrigeration air conditioning mode: suitable for summer hot water tank water temperature has reached the standard and indoor temperature above 25℃ need refrigeration air conditioning occasions; In this mode, the refrigeration air conditioning cycle circuit is operated; indoor air circulation heat exchange circuit or water circulation heat exchange circuit is operated; The compressor, outdoor fan, indoor fan are in running state; hot water circulating pump is in stop state; four-way valve is in refrigeration cycle position, waterway three-way valve is in the first, second interface access; outdoor heat exchanger as condenser, heat release to outdoor air; indoor heat exchanger as evaporator, heat absorption refrigeration; hot water heat exchanger without heat exchange, heat supplement heat exchanger without heat exchange; (5) reverse cycle defrosting mode: in the process of heating, when the outdoor heat exchanger frost serious lead to compressor suction pressure drop sharply more than the set threshold value; In this mode, the three-way machine refrigerant cycle path is the same as the refrigeration air conditioning cycle circuit, the forced hot water circulation circuit is operated; The compressor is in running state, outdoor fan is in stop state, indoor fan is in stop state; hot water circulating pump is in running state; four-way valve is in refrigeration cycle position, waterway three-way valve is in the first, second interface access; outdoor heat exchanger as condenser, defrosting, indoor heat exchanger without heat exchange; hot water heat exchanger heat exchange, hot water tank hot water heat release, heat supplement heat exchanger without heat exchange; (6) dehumidification and heat supplement mode: suitable for spring indoor relative humidity greater than 60% need dehumidification and prevent indoor temperature too low occasions; In this mode, the three-way machine runs the first hot water circulation circuit and heat supplement hot water circulation circuit; The compressor is in low speed running state, outdoor fan is in low speed running state, indoor fan is in stop state; hot water circulating pump is in running; four-way valve is in refrigeration cycle position, waterway three-way valve is in the first, third interface access; Outdoor heat exchanger without heat exchange, indoor heat exchanger as evaporator, in the process of heat absorption refrigeration dehumidification; hot water heat exchanger heat exchange, heat supplement heat exchanger in heat release heat supplement; (7) surplus power grid mode: in the absence of hot water and air conditioning heating three-way machine in stop state, and the household electrical load is small in the daytime, the photovoltaic power supply system will deliver photovoltaic surplus power to the power grid.

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