Cold and hot storage shaft type rotary buried pipe energy supply system and energy supply method

Abstract

The invention relates to the field of clean energy supply technology research, in particular to a cold and heat storage shaft type rotary buried pipe energy supply system and method, and the system comprises a pipe network, a rotary buried pipe energy storage assembly, a cold storage assembly, a heat storage assembly, an energy supply assembly and a hot water supply assembly. Compared with a system in the prior art, the system can achieve four operation modes of cold storage, heat storage, energy supply and hot water supply. Particularly, the rotary buried pipe energy storage assembly is additionally arranged in the system and used in cooperation with other assemblies, and the energy supply efficiency can be effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of clean energy supply, and relates to the research field of underground energy storage and ground energy supply technology, and specifically is a shaft-type rotating buried pipe energy supply system and energy supply method with dual cold and hot storage. Background Art

[0002] As a key technical means, ground source heat pump technology has been widely used in the exploitation of geothermal energy. Among them, the buried pipe ground source heat pump system is a closed-loop circulation system that uses the heat in the underground rock or groundwater to achieve heat transfer between the system and the earth through the flow of circulating fluid in the closed underground buried pipe. It releases heat to the earth and absorbs cold in summer and releases cold in winter. It is an energy-saving and environmentally friendly heating and cooling technology that is widely used in building heating and cooling by inputting a small amount of high potential energy.

[0003] However, the initial conditions underground are warm in winter and cool in summer. The newly built geothermal heat pump system has high energy efficiency in the first few years. As the geothermal heat pump system operates for a longer period of time, the underground temperature often deviates from the original ground temperature, resulting in the accumulation of cold / heat year by year, reducing the operating efficiency of the geothermal heat pump system, or even making it impossible to operate. Therefore, artificial heating or cooling is required to maintain the cold and heat balance underground. In addition, the traditional vertical U-shaped buried pipes commonly used in geothermal heat pump systems have problems such as a large number of drill holes, high cost, and slow heat storage speed, which are not conducive to the construction of energy storage systems. Therefore, it is more important to speed up the rate of cold / heat storage to improve the utilization efficiency of geothermal heat pumps. Summary of the invention

[0004] Based on the problems existing in the prior art, the present invention proposes a shaft-type rotary buried pipe energy supply system and energy supply method with dual cold and hot storage.

[0005] The present invention provides a cold and hot dual storage wellbore rotary buried pipe energy supply system, comprising:

[0006] Pipeline network;

[0007] A rotating buried pipe energy storage assembly for cold or heat storage, which is connected to the water inlet and outlet of the pipe network respectively;

[0008] A cold storage component for cold storage cycle connected to the water inlet and the water outlet of the rotary buried pipe energy storage component;

[0009] A heat storage component for heat storage cycle connected to the water inlet and the water outlet of the rotary buried pipe energy storage component;

[0010] An energy supply component connected to the water inlet and outlet of the rotary buried pipe energy storage component and used for performing a heating cycle or a cooling cycle for the user side;

[0011] and a hot water supply assembly in communication with the heat storage assembly for supplying water to users;

[0012] Among them, the water outlet end of the heat storage component and the water outlet end of the cold storage component are connected to the water inlet end of the rotating buried tube energy storage component, and the water outlet end of the rotating buried tube energy storage component is connected to the water inlet end of the cold storage component and the water inlet end of the heat storage component.

[0013] Based on the above scheme, the rotating buried pipe energy storage assembly includes a shaft pile buried in the inner layer of the soil, a double-layer steel cage for support arranged inside the shaft pile, and a double-layer water pipe spirally wound on the double-layer steel cage for water circulation.

[0014] On the basis of the above scheme, it also includes: an energy storage component water inlet pipe connected to the water inlet end of the double-layer water pipe through a water inlet pipe tee and an energy storage component water outlet pipe connected to the water outlet end of the water inlet end of the double-layer water pipe through a water outlet pipe tee.

[0015] Based on the above solution, the cold storage component includes a cooling tower;

[0016] Wherein, the water outlet end of the cooling tower is connected to the cooling tower water outlet pipe, and the water inlet end of the cooling tower is connected to the cooling tower water inlet pipe;

[0017] The water outlet end of the cooling tower water outlet pipe is connected to the water inlet end of the energy storage component water inlet pipe for outputting cold water after spraying and cooling. The water inlet end of the cooling tower water inlet pipe is connected to the water outlet end of the energy storage component water outlet pipe for inputting water whose temperature is increased by the rotating buried pipe energy storage component.

[0018] On the basis of the above scheme, the cooling tower outlet pipe is provided with a cold storage component water outlet solenoid valve for opening and closing the cooling tower outlet pipe and controlling the opening and closing degree of the flow path in the cooling tower outlet pipe, a first three-way for connecting the water outlet end of the heat storage component, a second three-way for connecting the water outlet end of the energy supply component, and an energy storage component water inlet control valve for opening and closing the water inlet pipe of the energy storage component in sequence along the fluid flow direction;

[0019] The cooling tower water inlet pipe is provided with an energy storage component water outlet control valve for opening and closing the energy storage component water outlet pipe, a third three-way valve for circulating the water inlet end of the energy supply component, a fourth three-way valve for connecting the water inlet end of the heat storage component, a cold storage component water inlet solenoid valve for opening and closing the cooling tower water inlet pipe and controlling the opening degree of the flow path in the cooling tower water inlet pipe, and a cooling tower circulating water pump for providing water supply power for the cooling tower in the order of fluid flow direction.

[0020] Based on the above solution, the heat storage component includes a solar collector and a hot water storage tank;

[0021] Among them, the water outlet end of the solar collector is connected to the water inlet end of the hot water storage tank through the collector water outlet pipe, and the water inlet end of the solar collector is connected to the water outlet end of the hot water storage tank through the collector water inlet pipe; the water outlet end of the hot water storage tank is connected to the first tee through the hot water storage tank water outlet pipe for flowing high-temperature water into the rotating buried pipe energy storage assembly for storage, and the water inlet end of the hot water storage tank is connected to the fourth tee through the hot water storage tank water inlet pipe for inputting low-temperature water into the rotating buried pipe energy storage assembly.

[0022] On the basis of the above scheme, the outlet pipe of the hot water storage tank is provided with a fifth three-way connection for connecting the water inlet end of the hot water supply component and a water outlet solenoid valve of the heat storage component for opening and closing the outlet pipe of the hot water storage tank and controlling the opening degree of the flow path in the outlet pipe of the hot water storage tank in sequence along the fluid flow direction;

[0023] The water inlet pipe of the hot water storage tank is provided with a heat storage component water inlet control valve for opening and closing the water inlet pipe of the hot water storage tank, a sixth three-way valve for connecting the water outlet end of the hot water supply component, and a heat storage component circulating water pump for providing water delivery power for the hot water storage tank in sequence along the fluid flow direction;

[0024] The collector outlet pipe is provided with a collector outlet control valve for opening and closing the collector outlet pipe, and the collector inlet pipe is provided with a collector inlet control valve for opening and closing the collector inlet pipe.

[0025] Based on the above solution, the energy supply component includes a ground source heat pump and a user side;

[0026] Among them, the underground side of the ground source heat pump is connected to the rotating buried pipe energy storage module through the ground source heat pump water inlet pipe and the ground source heat pump water outlet pipe; the ground source heat pump air conditioning side is connected to the user side through the energy supply module water supply pipe and the energy supply module return pipe.

[0027] Based on the above solution, the hot water supply assembly includes a plate heat exchanger;

[0028] The first water inlet end of the plate heat exchanger is connected to the fifth tee through the first heat exchanger water inlet pipe for inputting high-temperature water in the hot water storage tank; the second water inlet end of the plate heat exchanger is connected to the second heat exchanger water inlet pipe for inputting low-temperature water for heat exchange;

[0029] The first water outlet end of the plate heat exchanger is connected to the sixth tee through the first plate heat exchanger water outlet pipe to flow the low-temperature water in the plate heat exchanger to the hot water storage tank for reheating; the second water outlet end of the plate heat exchanger is connected to the second heat exchanger water inlet pipe to supply high-temperature water to users.

[0030] In addition, the present invention also provides a cold and hot dual storage wellbore rotary buried pipe energy supply method, using the energy supply system, specifically including:

[0031] When the cold storage mode is in operation: the cold storage component water inlet solenoid valve, cooling tower circulating water pump, cold storage component water outlet solenoid valve, energy storage component water inlet control valve and energy storage component water outlet control valve are turned on, and the other valves and water pumps are all closed; the cold water generated by the cooling tower flows into the rotating buried pipe energy storage component for storage, and the cold water with increased temperature flows out of the energy storage component outlet pipe, and then flows into the cooling tower through the cooling tower inlet pipe, where water is sprayed for cooling, and the next cold storage cycle begins;

[0032] When the heat storage mode is in operation: open all valves of the heat storage component and the water outlet control valve of the energy storage component, and the other valves and water pumps are closed; the water in the hot water storage tank flows into the solar collector through the collector inlet pipe, absorbs solar energy in the solar collector to raise the water temperature, and then enters the hot water storage tank through the collector outlet pipe to complete the solar energy collection; the hot water stored in the hot water storage tank flows through the hot water storage tank outlet pipe, the cooling tower outlet pipe, and the energy storage component inlet pipe in turn, and is stored in the rotary buried pipe energy storage component through the tee of the inlet pipe. The hot water with reduced temperature passes through the outer water pipe and the inner water pipe, and merges to the energy storage component outlet pipe through the outlet pipe tee, and then flows into the hot water storage tank through the hot water tank inlet pipe to carry out the next heat storage cycle;

[0033] When the energy supply mode is in operation: open the energy storage component water inlet control valve, energy storage component water outlet control valve, and energy supply component valves, and the remaining valves and water pumps are in the closed state; in summer cooling, the ground source heat pump transports the heat from the user side through the ground source heat pump outlet pipe and the energy storage component inlet pipe to the rotating buried pipe energy storage component below the ground, extracts the cold in the rotating buried pipe energy storage component through the energy storage component outlet pipe and the ground source heat pump inlet pipe to the ground source heat pump, and supplies it to the user side through the energy supply module water supply pipe; in winter heating, the ground source heat pump extracts heat from the rotating buried pipe energy storage component below the ground, and hot water enters the ground source heat pump through the energy storage component outlet pipe and the ground source heat pump inlet pipe. After further temperature increase in the ground source heat pump, it is transported to the user side for heating. The ground source heat pump transports the cold from the user side through the ground source heat pump outlet pipe and the energy storage component inlet pipe to the medium layer of the rotating buried pipe energy storage component below the ground, completing the cooling and heating cycle;

[0034] When the hot water supply mode is in operation: the collector water outlet control valve, the collector water inlet control valve, the heat storage component circulation water pump and the valves of the hot water supply component are opened, and the other valves and water pumps are closed; the water in the hot water storage tank flows into the solar collector through the collector water inlet pipe, absorbs solar energy in the solar collector to raise the water temperature, and then enters the hot water storage tank through the collector water outlet pipe, completing the solar energy collection; the hot water in the hot water storage tank enters the plate heat exchanger through the hot water storage tank water outlet pipe and the first heat exchanger water inlet pipe, and exchanges heat with the water from the second heat exchanger water inlet pipe. The water with lowered temperature after the heat exchange enters the hot water storage tank through the first plate heat exchanger water outlet pipe and the hot water storage tank water inlet pipe, and is heated again; the water in the second heat exchanger water inlet pipe is heated by the hot water from the hot water storage tank and is supplied to users through the second heat exchanger water inlet pipe, realizing the supply of domestic hot water.

[0035] Compared with the existing technology system, the present invention makes the most of natural energy such as dry air energy, solar energy and geothermal energy, solves the problem of underground cold and heat imbalance, realizes the integration of energy supply and energy storage, and realizes the sustainable utilization of geothermal resources. It realizes four operation modes of cold storage, heat storage, energy supply and hot water supply, truly realizes the integration of supply and storage, and the system is simple and easy to install and maintain; in particular, the rotating buried pipe energy storage component solves the problems of the large number of drilling holes, high cost and slow heat storage speed of the U-shaped pipe of the traditional ground source heat pump system. The cold storage component, the heat storage component and the rotating buried pipe energy storage component are used in combination. Compared with the use with the traditional U-shaped buried pipe energy storage component, the cold storage and heat storage rate can be improved, and the cold storage and heat efficiency can be improved; at the same time, the transition season cooling tower cold storage and solar energy heat storage are used to realize "cold and hot dual storage", breaking the limitations of traditional single energy storage, and the cross-season energy storage improves the operation efficiency of the heat pump, which is conducive to the long-term stable operation of the system and realizes the sustainable utilization of geothermal resources. In addition, the components included in the system of the present invention are easy to purchase and assemble, and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the structure of the shaft-type rotary buried pipe energy supply system with cold and hot dual storage in Example 1 of the present invention;

[0037] Figure 2 Schematic diagram of the structure of the rotary buried pipe energy storage assembly in Example 1 of the present invention (showing a cross-sectional view);

[0038] Figure 3 This is a schematic diagram of the structure of the rotary buried pipe energy storage assembly in Example 1 of the present invention;

[0039] Figure 4 Schematic diagram of the cold storage mode in Example 1 of the present invention (showing the cold storage component);

[0040] Figure 5 Schematic diagram of heat storage mode in Example 1 of the present invention (showing heat storage components);

[0041] Figure 6 Schematic diagram of energy supply mode in Embodiment 1 of the present invention (showing energy supply components);

[0042] Figure 7 Schematic diagram of hot water supply mode in embodiment 1 of the present invention (showing hot water supply components). DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be pointed out that the embodiments described below are intended to facilitate the understanding of the present invention and do not have any limiting effect on the present invention.

[0044] Example 1

[0045] like Figure 1 As shown, the present invention provides a wellbore type rotary buried pipe energy supply system with cold and hot dual storage, comprising:

[0046] Pipeline network 1;

[0047] A rotating buried pipe energy storage assembly 2 for cold or heat storage, which is respectively connected to the water inlet and the water outlet of the pipe network 1;

[0048] A cold storage component 3 for cold storage cycle, which is connected to the water inlet and the water outlet of the rotary buried pipe energy storage component 2;

[0049] A heat storage component 4 for heat storage cycle connected to the water inlet and the water outlet of the rotary buried pipe energy storage component 2;

[0050] An energy supply component 5 connected to the water inlet and outlet of the rotary buried pipe energy storage component 2 and used for performing a heating cycle or a cooling cycle for the user side;

[0051] A hot water supply component 6 is communicated with the heat storage component 4 and is used to supply water to users.

[0052] Among them, the water outlet end of the heat storage component 4 and the water outlet end of the cold storage component 3 are connected to the water inlet end of the rotating buried tube energy storage component 2, and the water outlet end of the rotating buried tube energy storage component 2 is connected to the water inlet end of the cold storage component 3 and the water inlet end of the heat storage component 4.

[0053] The above-mentioned system of the present invention includes a dry air energy cold storage component, a solar energy heat storage component, a rotating buried pipe energy storage component and a ground source heat pump energy supply component, which can provide users with cold storage, heat storage, energy supply or hot water supply, and can provide one energy supply mode alone or both heat storage and hot water supply.

[0054] like Figure 2As shown, as a specific implementation scheme, the rotating buried pipe energy storage assembly 2 includes a shaft pile 2-1 buried in the inner layer of the soil, a double-layer steel cage 2-2 for support arranged inside the shaft pile 2-1, and a double-layer water pipe 2-3 spirally wound on the double-layer steel cage 2-2 for water circulation.

[0055] The double-layer steel cage 2-2 comprises an outer steel cage 2-2-1 and an inner steel cage 2-2-2 arranged inside the outer steel cage 2-2-1.

[0056] The double-layer water pipe 2-3 includes an outer water pipe 2-3-1 spirally wound clockwise on the outer steel cage 2-2-1 and an inner water pipe 2-3-2 spirally wound clockwise on the inner steel cage 2-2-2. Specifically, the water pipe is spirally wound clockwise downward from the top of the outer steel cage 2-2-1 to the outside of the outer steel cage 2-2-1, and then spirally wound to the bottom of the outer steel cage 2-2-1, and then vertically extended to the ground along the inner side of the shaft pile 2-1. The water pipe is spirally wound clockwise downward from the top of the inner steel cage 2-2-2 to the outside of the inner steel cage 2-2-2, and then spirally wound to the bottom of the inner steel cage 2-2-2, and then vertically extended to the ground along the inner side of the shaft pile 2-1.

[0057] like Figure 2-Figure 3 As shown, in order to realize fluid diversion, it also includes: an energy storage component water inlet pipe 2-5 interconnected with the water inlet end of the outer water pipe 2-3-1 and the water inlet end of the inner water pipe 2-3-2 through the water inlet pipe tee 2-4, and an energy storage component water outlet pipe 2-7 interconnected with the water outlet end of the outer water pipe 2-3-1 and the water outlet end of the inner water pipe 2-3-2 through the water outlet pipe tee 2-6.

[0058] Among them, the shaft pile 2-1 is a double-layer cylindrical structure, and the original soil is filled between the double-layer cylinder walls as a medium layer 2-16 for energy storage and heat preservation.

[0059] In order to further obtain the state of parameters such as pressure, temperature, flow, etc., it also includes: a water inlet pipe valve 2-8, a water inlet pipe flow meter 2-9, a water inlet pipe pressure meter 2-10 and a water inlet pipe thermometer 2-11 arranged on the water inlet pipe 2-5 of the energy storage component along the fluid flow direction. The well pile 2-1 is equipped with a data acquisition instrument 2-17, a temperature measuring optical fiber 2-18 and a temperature probe 2-19 for measuring the cold / hot storage temperature and collecting data.

[0060] It also includes: a water outlet pipe thermometer 2-12, a water outlet pipe pressure gauge 2-13, a water outlet pipe flow meter 2-14 and a water outlet pipe valve 2-15 arranged on the energy storage component water outlet pipe 2-7 along the fluid flow direction.

[0061] In this embodiment, the energy storage component water inlet pipe 2-5, the energy storage component water outlet pipe 2-7, the input end of the outer water pipe 2-3-1, the input end of the inner water pipe 2-3-2, the output end of the outer water pipe 2-3-1, and the output end of the inner water pipe 2-3-2 are all PE pipes with a diameter of 32 cm.

[0062] The rotary buried pipe energy storage assembly 2 utilizes the thermal insulation characteristics of the stratum to store the heat energy from the solar energy underground through the rotary buried pipe energy storage assembly 2. Different from the traditional spiral buried pipe heat storage, the wellbore type double-layer rotary buried pipe heat storage provided by the present invention utilizes double pipes wound around the outer and inner steel cages, thereby increasing the heat storage amount, improving the heat storage speed, and enhancing the heat storage performance.

[0063] like Figure 4 As shown, as a specific implementation scheme, the cold storage component 3 includes a cooling tower 3-1, wherein the water outlet end of the cooling tower 3-1 is connected to the cooling tower water outlet pipe 3-1-1, and the water inlet end of the cooling tower 3-1 is connected to the cooling tower water inlet pipe 3-1-2; the water outlet end of the cooling tower water outlet pipe 3-1-1 is connected to the water inlet end of the energy storage component water inlet pipe 2-5 for outputting cold water after spraying and cooling, and the water inlet end of the cooling tower water inlet pipe 3-1-2 is connected to the water outlet end of the energy storage component water outlet pipe 2-7 for inputting water whose temperature is increased by the rotating buried pipe energy storage component 2.

[0064] On the basis of the above scheme, the cooling tower outlet pipe 3-1-1 is provided with a cold storage component water outlet solenoid valve 3-2 for opening and closing the cooling tower outlet pipe 3-1-1 and controlling the opening degree of the flow path in the cooling tower outlet pipe 3-1-1, a first tee 3-3 for connecting the water outlet end of the heat storage component 4, a second tee 3-4 for connecting the water outlet end of the energy supply component 5 and an energy storage component water inlet control valve 3-10 for opening and closing the energy storage component water inlet pipe 2-5 in sequence along the fluid flow direction.

[0065] The cooling tower water inlet pipe 3-1-2 is provided with an energy storage component water outlet control valve 3-5 for opening and closing the energy storage component water outlet pipe 2-7, a third three-way valve 3-6 for circulating the water inlet end of the energy supply component 5, a fourth three-way valve 3-7 for connecting the water inlet end of the heat storage component 4, a cold storage component water inlet solenoid valve 3-8 for opening and closing the cooling tower water inlet pipe 3-1-2 and controlling the opening degree of the flow path in the cooling tower water inlet pipe 3-1-2, and a cooling tower circulating water pump 3-9 for providing water supply power for the cooling tower 3-1.

[0066] When the cold storage mode is in operation, the cold storage component water inlet solenoid valve 3-8, the cooling tower circulating water pump 3-9, the cold storage component water outlet solenoid valve 3-2, the energy storage component water inlet control valve 3-10 and the energy storage component water outlet control valve 3-5 are opened, and the remaining valves and water pumps are closed. The cold water generated by the cooling tower 3-1 flows through the cooling tower outlet pipe 3-1-1, the first tee 3-3 and the second tee 3-4, and is diverted to the water inlet ends of the inner and outer water pipes 2-3-1 and the inner water pipe 2-3-2 of the rotating buried pipe energy storage component 2 through the water inlet pipe tee 2-4, and flows into the underground rotating pipe. When flowing through the rotating pipe, the cold water dissipates the cold energy to the medium layer 2-16 for storage. The cold water with increased temperature passes through the outlet ends of the inner and outer water pipes 2-3-1 and the inner water pipe 2-3-2 of the energy storage component, and merges into the energy storage component outlet pipe 2-7 through the water outlet pipe tee 2-6, and then flows into the cooling tower 3-1 through the cooling tower inlet pipe 3-1-2, and water is sprayed in the cooling tower 3-1 to cool down, and the next cold storage cycle begins.

[0067] like Figure 5 As shown, as a specific implementation scheme, the heat storage component 4 includes a solar collector 4-1 and a hot water storage tank 4-2, and the heat collected by the solar collector 4-1 is stored in the hot water storage tank 4-2, wherein the water outlet end of the solar collector 4-1 is connected to the water inlet end of the hot water storage tank 4-2 through the collector water outlet pipe 4-1-1, and the water inlet end of the solar collector 4-1 is connected to the water outlet end of the hot water storage tank 4-2 through the collector water inlet pipe 4-1-2; the water outlet end of the hot water storage tank 4-2 is connected to the first tee 3-3 through the hot water storage tank water outlet pipe 4-2-1 for flowing high-temperature water into the rotating buried tube energy storage component 2 for storage, and the water inlet end of the hot water storage tank 4-2 is connected to the fourth tee 3-7 through the hot water storage tank water inlet pipe 4-2-2 for inputting low-temperature water into the rotating buried tube energy storage component 2.

[0068] On the basis of the above scheme, the fifth three-way valve 4-3 for connecting to the water inlet end of the hot water supply assembly 6 and the heat storage assembly water outlet solenoid valve 4-4 for opening and closing the hot water storage tank water outlet pipe 4-2-1 and controlling the opening degree of the flow path in the hot water storage tank water outlet pipe 4-2-1 are sequentially arranged on the hot water storage tank water outlet pipe 4-2-1 along the fluid flow direction. The heat storage assembly water inlet control valve 4-5 for opening and closing the hot water storage tank water inlet pipe 4-2-2, the sixth three-way valve 4-6 for connecting to the water outlet end of the hot water supply assembly 6 and the heat storage assembly circulating water pump 4-7 for providing water delivery power for the hot water storage tank 4-2 are sequentially arranged on the hot water storage tank water inlet pipe 4-2-2 along the fluid flow direction.

[0069] On the basis of the above scheme, a collector outlet control valve 4-8 for opening and closing the collector outlet pipe 4-1-1 is provided on the collector outlet pipe 4-1-1, and a collector inlet control valve 4-9 for opening and closing the collector inlet pipe 4-1-2 is provided on the collector inlet pipe 4-1-2.

[0070] When the heat storage mode is in operation: open the collector water outlet control valve 4-8, the heat storage component water outlet solenoid valve 4-4, the energy storage component water inlet control valve 3-10, the energy storage component water outlet control valve 3-5, the heat storage component water inlet control valve 4-5, the collector water inlet control valve 4-9 and the heat storage component circulating water pump 4-7, and the remaining valves and water pumps are closed. The water in the hot water storage tank 4-2 flows into the solar collector 4-1 through the collector water inlet pipe 4-1-2, absorbs solar energy in the solar collector 4-1 to raise the water temperature, and then enters the hot water storage tank 4-2 through the collector water outlet pipe 4-1-1, completing the solar energy collection; the hot water stored in the hot water storage tank 4-2 flows in turn through the hot water storage tank water outlet pipe 4-2-1, the cooling tower water outlet pipe 3-1-1, the energy storage component water inlet pipe 2-5, and passes through the water inlet pipe tee. 2-4 is divided into the outer water pipe 2-3-1 and the inner water pipe 2-3-2, and flows into the underground rotating pipe. When the hot water flows through the rotating pipe, the heat is dissipated to the medium layer 2-16 for storage. The hot water with reduced temperature passes through the outer water pipe 2-3-1 and the inner water pipe 2-3-2, and is combined to the energy storage component outlet pipe 2-7 through the outlet pipe tee 2-6, and then flows into the hot water storage tank 4-2 through the hot water storage tank inlet pipe 4-2-2 for the next heat storage cycle.

[0071] like Figure 6 As shown, as a specific implementation scheme, the energy supply component 5 includes a ground source heat pump 5-1 and a user side 5-2, wherein the underground side of the ground source heat pump 5-1 is connected to the rotating buried pipe energy storage module 2 through a ground source heat pump water inlet pipe 5-1-1 and a ground source heat pump water outlet pipe 5-1-2; the air-conditioning side of the ground source heat pump 5-1 is connected to the user side 5-2 through an energy supply module water supply pipe 5-2-2 and an energy supply module return pipe 5-2-1.

[0072] On the basis of the above scheme, at the water inlet end of the ground source heat pump 5-1, a ground source heat pump circulating water pump 5-3 for providing water supply power for the ground source heat pump 5-1 and a ground source heat pump water inlet control valve 5-4 for opening and closing the ground source heat pump water inlet pipe 5-1-1 are sequentially arranged along the fluid flow direction on the ground source heat pump water inlet pipe 5-1-1; an energy supply module return water control valve 5-5 for opening and closing the energy supply module return water pipe 5-2-1 is arranged on the energy supply module return water pipe 5-2-1. At the water outlet end of the ground source heat pump 5-1, a ground source heat pump water outlet control valve 5-6 for opening and closing the ground source heat pump water outlet pipe 5-1-2 is arranged on the ground source heat pump water outlet pipe 5-1-2; an energy supply component water supply control valve 5-7 for opening and closing the energy supply module water supply pipe 5-2-2 and an energy supply component circulating water pump 5-8 for providing water supply power for the user side 5-2 are arranged in sequence along the fluid flow direction on the energy supply module water supply pipe 5-2-2.

[0073] When the energy supply component 5 is in use: open the energy storage component water inlet control valve 3-10, the energy storage component water outlet control valve 3-5, the ground source heat pump water inlet control valve 5-4, the energy supply component return water control valve 5-5, the energy supply component water supply control valve 5-7, the ground source heat pump water outlet control valve 5-6, the ground source heat pump circulating water pump 5-3 and the energy supply component circulating water pump 5-8, and the remaining valves and water pumps are all closed. During summer cooling, the geothermal heat pump 5-1 transfers the heat from the user side 5-2 to the rotating buried pipe energy storage assembly 2 below the ground through the geothermal heat pump outlet pipe 5-1-2 and the energy storage assembly inlet pipe 2-5, extracts the cold energy in the rotating buried pipe energy storage assembly 2 to the geothermal heat pump 5-1 through the energy storage assembly outlet pipe 2-7 and the geothermal heat pump inlet pipe 5-1-1, and supplies it to the user side 5-2 through the energy supply module water supply pipe 5-2-2. During winter heating, the geothermal heat pump 5-1 extracts the cold energy from the rotating buried pipe energy storage assembly 2 below the ground through the energy storage assembly outlet pipe 2-7 and the geothermal heat pump inlet pipe 5-1-1, and supplies it to the user side 5-2 through the energy supply module water supply pipe 5-2-2. Heat is extracted from the rotating buried pipe energy storage assembly 2, and hot water enters the ground source heat pump 5-1 through the energy storage assembly outlet pipe 2-7 and the ground source heat pump inlet pipe 5-1-1. After further temperature increase in the ground source heat pump 5-1, it is transported to the user side 5-2 for heating. The ground source heat pump 5-1 transports the cold from the user side 5-2 through the ground source heat pump outlet pipe 5-1-2 and the energy storage assembly inlet pipe 2-5 to the medium layer 2-16 of the rotating buried pipe energy storage assembly 2 below the ground, completing the cooling and heating cycle.

[0074] like Figure 7As shown, as a specific implementation scheme, the hot water supply assembly 6 includes a plate heat exchanger 6-1, wherein the first water inlet end of the plate heat exchanger 6-1 is connected to the fifth tee 4-3 through the first heat exchanger inlet pipe 6-1-1 for inputting high-temperature water in the hot water storage tank 4-2; the second water inlet end of the plate heat exchanger 6-1 is connected to the second heat exchanger inlet pipe 6-1-2 for inputting low-temperature water for heat exchange. The first water outlet end of the plate heat exchanger 6-1 is connected to the sixth tee 4-6 through the first plate heat exchanger outlet pipe 6-1-3 for flowing the low-temperature water in the plate heat exchanger 6-1 to the hot water storage tank 4-2 for reheating; the second water outlet end of the plate heat exchanger 6-1 is connected to the second heat exchanger inlet pipe 6-1-4 for supplying high-temperature water to users.

[0075] On the basis of the above scheme, the first control valve 6-2 for opening and closing the first heat exchanger water inlet pipe 6-1-1 is provided on the first heat exchanger water inlet pipe 6-1-1, and the second control valve 6-3 for opening and closing the second heat exchanger water inlet pipe 6-1-2 is provided on the second heat exchanger water inlet pipe 6-1-2. The third control valve 6-4 for opening and closing the first plate heat exchanger water outlet pipe 6-1-3 is provided on the first plate heat exchanger water outlet pipe 6-1-3, and the fourth control valve 6-5 for opening and closing the second heat exchanger water inlet pipe 6-1-4 is provided on the second heat exchanger water inlet pipe 6-1-4.

[0076] When the hot water supply mode is in operation: open the collector water outlet control valve 4-8, the collector water inlet control valve 4-9, the first control valve 6-2, the third control valve 6-4, the second control valve 6-3, the fourth control valve 6-5 and the heat storage component circulating water pump 4-7, and the remaining valves and water pumps are all closed. The water in the hot water tank 4-2 flows into the solar collector 4-1 through the collector inlet pipe 4-1-2, absorbs solar energy in the solar collector 4-1 to raise the water temperature, and then enters the hot water tank 4-2 through the collector outlet pipe 4-1-1, completing the solar energy collection; the hot water in the hot water tank 4-2 enters the plate heat exchanger 6-1 through the hot water tank outlet pipe 4-2-1 and the first heat exchanger inlet pipe 6-1-1, and exchanges heat with the water from the second heat exchanger inlet pipe 6-1-2 (the return water of domestic hot water), and the water with lowered temperature after the heat exchange enters the hot water tank 4-2 through the first plate heat exchanger outlet pipe 6-1-3 and the hot water tank inlet pipe 4-2-2, and is heated again; the water in the second heat exchanger inlet pipe 6-1-2 is heated by the hot water from the hot water tank 4-2 and is supplied to users through the second heat exchanger inlet pipe 6-1-4, realizing the supply of domestic hot water.

[0077] The above system of the present invention can realize four operation modes of cold storage, heat storage, energy supply and hot water supply, truly realizing the integration of supply and storage, and the system is simple and easy to install and maintain.

[0078] Example 2

[0079] A shaft-type rotary buried pipe energy supply method with dual cold and hot storage, the device adopts the device in Example 1. In this embodiment, the cold storage mode is operated in spring, the dry air energy cold storage component 3 and the rotary buried pipe energy storage component 2 are turned on, and the ground source heat pump energy supply component 5 and the solar energy heat storage component 4 are turned off; specifically, the cooling tower 3-1 is connected to the cooling tower water inlet pipe 3-1-2 and the cooling tower water outlet pipe 3-1-1, and the cooling tower 3-1 is used for cooling in spring, and the produced cold water is transported to the rotary buried pipe energy storage component 2 through the cooling tower water outlet pipe 3-1-1.

[0080] In autumn, the heat storage mode is operated. The heat storage mode and the hot water supply mode can be operated at the same time. The solar heat storage component 4 and the rotary buried pipe energy storage component 2 are turned on, and the ground source heat pump energy supply component 5 and the dry air energy cold storage component 3 are turned off;

[0081] In the energy supply mode of summer and winter operation, the ground source heat pump energy supply component 5 and the rotating buried pipe energy storage component 2 are turned on, and the dry air energy cold storage component 3 and the solar energy heat storage component 4 are turned off.

[0082] In this embodiment, the solar thermal storage component 4 includes a solar collector 4-1, a hot water storage tank 4-2 and a plate heat exchanger 6-1. The solar collector 4-1 and the hot water storage tank 4-2 are connected via the collector inlet pipe 4-1-2 and the collector outlet pipe 4-1-1, and the heat collected by the solar collector 4-1 is stored in the hot water storage tank 4-2; the hot water stored in the hot water storage tank 4-2 is output via the hot water storage tank outlet pipe 4-2-1, a part of which is output to the rotary buried pipe energy storage component 2 via the cooling tower outlet pipe 3-1-1, and the other part is output to the plate heat exchanger 6-1 via the first heat exchanger inlet pipe 6-1-1, and heat is exchanged with the domestic hot water return water from the second heat exchanger inlet pipe 6-1-2 in the plate heat exchanger 6-1; the hot water from the rotary buried pipe 2 is output ... hot water return water from the rotary buried pipe 2 is output via the cooling tower outlet pipe 3-1-1, and the hot water return water from the rotary buried pipe 2 is output via the cooling tower outlet pipe 3-1-1, and the hot water return water from the rotary buried pipe 2 is output via the cooling tower outlet pipe 3-1-1, and the hot water return water from the rotary buried pipe 2 is output via the cooling tower outlet pipe 3-1-1, and the hot water return water from the rotary buried pipe 2 is output via the cooling tower outlet pipe 3-1-1, and the hot water return water from the rotary buried pipe 2 The return water of the buried pipe energy storage assembly 2 and the return water from the plate heat exchanger 6-1 are respectively returned to the hot water storage tank 4-2 through the hot water storage tank inlet pipe 4-2-2 and the first plate heat exchanger outlet pipe 6-1-3; the collector inlet pipe 4-1-2 and the collector outlet pipe 4-1-1 are respectively provided with a collector inlet control valve 4-9 and a collector outlet control valve 4-8; the hot water storage tank outlet pipe 4-2-1 and the hot water storage tank inlet pipe 4-2-2 are respectively provided with a heat storage assembly water outlet solenoid valve 4-4 and a heat storage assembly water inlet control valve 4-5; the hot water storage tank inlet pipe 4-2-2 is provided with a heat storage assembly circulating water pump 4-7.

[0083] In this embodiment, the energy storage device of the rotating buried pipe energy storage assembly 2 is an underground shaft type rotating pipe accumulator. The water outlet of the shaft type rotating pipe accumulator is output through the energy storage assembly outlet pipe 2-7, part of which is output to the dry air energy cold storage / solar energy heat storage assembly 4, and the other part is output to the ground source heat pump energy supply assembly 5 through the ground source heat pump inlet pipe 5-1-1. The return water of the dry air energy cold storage / solar energy storage assembly entering the cooling tower outlet pipe 3-1-1 and the return water of the ground source heat pump energy supply assembly 5 entering the ground source heat pump outlet pipe 5-1-2 are returned to the energy storage assembly inlet pipe 2-5, and then return to the shaft type rotating pipe accumulator to complete the water supply and return cycle of the rotating buried pipe energy storage assembly; the shaft type rotating pipe accumulator is provided with an inner layer of steel cage 2-2-2 and the outer steel cage 2-2-1; the energy storage assembly water inlet pipe 2-5 is connected with the water inlet ends of the outer water pipe 2-3-1 and the inner water pipe 2-3-2 through the water inlet pipe tee 2-4; the energy storage assembly water outlet pipe 2-7 is connected with the water outlet ends of the outer water pipe 2-3-1 and the inner water pipe 2-3-2 through the water outlet pipe tee 2-6; the energy storage assembly water inlet pipe 2-5 is provided with an energy storage assembly water inlet control valve 3-10 and an energy storage assembly water outlet control valve 3-5; the outer water pipe 2-3-1 and the inner water pipe 2-3-2 are respectively wound around the surface of the double-layer steel cage 2-2.

[0084] By using the system and method of the present embodiment, natural energy such as dry air energy, solar energy and geothermal energy can be utilized to the greatest extent, the problem of underground cold and heat imbalance can be solved, the integration of energy supply and energy storage can be realized, the geothermal resources can be sustainably utilized, and four operating modes of cold storage, heat storage, energy supply and hot water supply can be realized, the integration of supply and storage can be truly realized, the system is simple, and it is easy to install and maintain; in particular, the rotating buried pipe energy storage assembly 2 effectively solves the problems of the large number of drilling holes, high cost, slow heat storage speed, etc. of the traditional ground source heat pump system U-tube.

[0085] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A hot and cold dual storage wellbore rotary buried pipe energy supply system, characterized in that: include: Pipeline network (1); A rotating buried pipe energy storage component (2) for storing cold or heat and connected to the water inlet and outlet of the pipe network (1) respectively; A cold storage component (3) for cold storage cycle, which is in communication with the water inlet and the water outlet of the rotating buried pipe energy storage component (2); A heat storage component (4) for heat storage cycle, which is in communication with the water inlet and the water outlet of the rotating buried pipe energy storage component (2); An energy supply component (5) connected to the water inlet and the water outlet of the rotary buried pipe energy storage component (2) and used for performing a heating cycle or a cooling cycle for the user side; and a hot water supply component (6) in communication with the heat storage component (4) for supplying water to users; The water outlet end of the heat storage component (4) and the water outlet end of the cold storage component (3) are connected to the water inlet end of the rotating buried tube energy storage component (2), and the water outlet end of the rotating buried tube energy storage component (2) is connected to the water inlet end of the cold storage component (3) and the water inlet end of the heat storage component (4).

2. The hot and cold dual storage wellbore rotary buried pipe energy supply system according to claim 1 is characterized in that: The rotary buried pipe energy storage assembly (2) comprises a shaft pile (2-1) buried in the inner layer of soil, a double-layer steel cage (2-2) arranged inside the shaft pile (2-1) for support, and a double-layer water pipe (2-3) spirally wound on the double-layer steel cage (2-2) for water circulation.

3. The hot and cold dual storage wellbore rotary buried pipe energy supply system according to claim 2 is characterized in that: Also includes: An energy storage component water inlet pipe (2-5) connected to the water inlet end of the double-layer water pipe (2-3) via a water inlet pipe tee (2-4) and an energy storage component water outlet pipe (2-7) connected to the water outlet end of the water inlet end of the double-layer water pipe (2-3) via a water outlet pipe tee (2-6).

4. The hot and cold dual storage wellbore rotary buried pipe energy supply system according to claim 3 is characterized in that: The cold storage component (3) comprises a cooling tower (3-1); The water outlet end of the cooling tower (3-1) is connected to the cooling tower water outlet pipe (3-1-1), and the water inlet end of the cooling tower (3-1) is connected to the cooling tower water inlet pipe (3-1-2); The water outlet end of the cooling tower water outlet pipe (3-1-1) is connected to the water inlet end of the energy storage component water inlet pipe (2-5) for outputting cold water after spray cooling, and the water inlet end of the cooling tower water inlet pipe (3-1-2) is connected to the water outlet end of the energy storage component water outlet pipe (2-7) for inputting water whose temperature has been raised by the rotating buried pipe energy storage component (2).

5. The hot and cold dual storage wellbore rotary buried pipe energy supply system according to claim 4 is characterized in that: The cooling tower water outlet pipe (3-1-1) is provided with a cold storage component water outlet solenoid valve (3-2) for opening and closing the cooling tower water outlet pipe (3-1-1) and controlling the opening and closing degree of the flow path in the cooling tower water outlet pipe (3-1-1), a first three-way valve (3-3) for connecting the water outlet end of the heat storage component (4), a second three-way valve (3-4) for connecting the water outlet end of the energy supply component (5), and an energy storage component water inlet control valve (3-10) for opening and closing the energy storage component water inlet pipe (2-5) in sequence along the fluid flow direction; The cooling tower water inlet pipe (3-1-2) is provided with an energy storage component water outlet control valve (3-5) for opening and closing the energy storage component water outlet pipe (2-7), a third three-way valve (3-6) for circulating the water inlet end of the energy supply component (5), a fourth three-way valve (3-7) for connecting the water inlet end of the heat storage component (4), a cold storage component water inlet solenoid valve (3-8) for opening and closing the cooling tower water inlet pipe (3-1-2) and controlling the opening degree of the flow path in the cooling tower water inlet pipe (3-1-2), and a cooling tower circulating water pump (3-9) for providing water delivery power for the cooling tower (3-1).

6. The hot and cold dual storage wellbore rotary buried pipe energy supply system according to claim 5 is characterized in that: The heat storage component (4) comprises a solar heat collector (4-1) and a hot water storage tank (4-2); The water outlet of the solar thermal collector (4-1) is connected to the water inlet of the hot water storage tank (4-2) through the collector water outlet pipe (4-1-1), and the water inlet of the solar thermal collector (4-1) is connected to the water outlet of the hot water storage tank (4-2) through the collector water inlet pipe (4-1-2); the water outlet of the hot water storage tank (4-2) is connected to the first tee (3-3) through the hot water storage tank water outlet pipe (4-2-1) for flowing high-temperature water into the rotating buried pipe energy storage assembly (2) for storage, and the water inlet of the hot water storage tank (4-2) is connected to the fourth tee (3-7) through the hot water storage tank water inlet pipe (4-2-2) for inputting low-temperature water from the rotating buried pipe energy storage assembly (2).

7. The hot and cold dual storage wellbore rotary buried pipe energy supply system according to claim 6 is characterized in that: The water outlet pipe (4-2-1) of the hot water storage tank is provided with a fifth three-way connection (4-3) for connecting to the water inlet end of the hot water supply assembly (6) and a water outlet electromagnetic valve (4-4) of the hot water storage assembly for opening and closing the water outlet pipe (4-2-1) of the hot water storage tank and controlling the opening degree of the flow path in the water outlet pipe (4-2-1) of the hot water storage tank in sequence along the fluid flow direction; A heat storage component water inlet control valve (4-5) for opening and closing the heat storage tank water inlet pipe (4-2-2), a sixth three-way valve (4-6) for connecting to the water outlet of the hot water supply component (6), and a heat storage component circulating water pump (4-7) for providing water delivery power for the heat storage tank (4-2) are sequentially arranged on the water inlet pipe (4-2-2) of the heat storage tank along the fluid flow direction; The collector water outlet pipe (4-1-1) is provided with a collector water outlet control valve (4-8) for opening and closing the collector water outlet pipe (4-1-1), and the collector water inlet pipe (4-1-2) is provided with a collector water inlet control valve (4-9) for opening and closing the collector water inlet pipe (4-1-2).

8. The hot and cold dual storage wellbore rotary buried pipe energy supply system according to claim 5 is characterized in that: The energy supply component (5) comprises a ground source heat pump (5-1) and a user side (5-2); The underground side of the ground source heat pump (5-1) is connected to the rotating buried pipe energy storage module (2) through a ground source heat pump water inlet pipe (5-1-1) and a ground source heat pump water outlet pipe (5-1-2); the air conditioning side of the ground source heat pump (5-1) is connected to the user side (5-2) through an energy supply module water supply pipe (5-2-2) and an energy supply module return pipe (5-2-1).

9. The hot and cold dual storage wellbore rotary buried pipe energy supply system according to claim 7 is characterized in that: The hot water supply component (6) comprises a plate heat exchanger (6-1); The first water inlet end of the plate heat exchanger (6-1) is connected to the fifth tee (4-3) through the first heat exchanger water inlet pipe (6-1-1) for inputting high-temperature water in the hot water storage tank (4-2); the second water inlet end of the plate heat exchanger (6-1) is connected to the second heat exchanger water inlet pipe (6-1-2) for inputting low-temperature water for heat exchange; The first water outlet end of the plate heat exchanger (6-1) is connected to the sixth tee (4-6) via the first plate heat exchanger water outlet pipe (6-1-3) for flowing low-temperature water in the plate heat exchanger (6-1) to the hot water storage tank (4-2) for reheating; the second water outlet end of the plate heat exchanger (6-1) is connected to the second heat exchanger water inlet pipe (6-1-4) for supplying high-temperature water to users.

10. A method for supplying energy to a rotating buried pipe in a wellbore with dual cold and hot storage, characterized in that: The energy supply system according to any one of claims 1 to 9 specifically comprises: When the cold storage mode is in operation: the cold storage component water inlet solenoid valve (3-8), the cooling tower circulating water pump (3-9), the cold storage component water outlet solenoid valve (3-2), the energy storage component water inlet control valve (3-10) and the energy storage component water outlet control valve (3-5) are opened, and the other valves and water pumps are closed; the cold water generated by the cooling tower (3-1) flows into the rotating buried pipe energy storage component (2) for storage, and the cold water with increased temperature flows out of the energy storage component outlet pipe (2-7), and then flows into the cooling tower (3-1) through the cooling tower inlet pipe (3-1-2), and water is sprayed in the cooling tower (3-1) for cooling, and the next cold storage cycle begins; When the heat storage mode is in operation: the valves of the heat storage component and the water outlet control valve (3-5) of the energy storage component are opened, and the other valves and water pumps are closed; the water in the heat storage water tank (4-2) flows into the solar collector (4-1) through the collector water inlet pipe (4-1-2), absorbs solar energy in the solar collector (4-1) to increase the water temperature, and then enters the heat storage water tank (4-2) through the collector water outlet pipe (4-1-1), completing the solar energy collection; the hot water stored in the heat storage water tank (4-2) flows through the heat storage water tank (4-2) in sequence The hot water flows through the water outlet pipe (4-2-1) of the water storage tank, the water outlet pipe (3-1-1) of the cooling tower, and the water inlet pipe (2-5) of the energy storage assembly, and is divided into the rotating buried pipe energy storage assembly (2) through the water inlet pipe tee (2-4) for storage. The hot water after the temperature is reduced flows through the outer water pipe (2-3-1) and the inner water pipe (2-3-2), and is combined to the water outlet pipe (2-7) of the energy storage assembly through the water outlet pipe tee (2-6), and then flows into the hot water storage tank (4-2) through the water inlet pipe (4-2-2) of the hot water storage tank to carry out the next heat storage cycle. When the energy supply mode is in operation: the energy storage component water inlet control valve (3-10), the energy storage component water outlet control valve (3-5), and the valves of the energy supply component (5) are opened, and the other valves and water pumps are all closed; when cooling in summer, the ground source heat pump (5-1) transmits the heat from the user side (5-2) through the ground source heat pump outlet pipe (5-1-2) and the energy storage component inlet pipe (2-5) to the rotating buried pipe energy storage component (2) below the ground, extracts the cold energy in the rotating buried pipe energy storage component (2) through the energy storage component outlet pipe (2-7) and the ground source heat pump inlet pipe (5-1-1) to the ground source heat pump (5-1), and supplies the heat to the ground source heat pump (5-1) through the energy supply module water supply pipe (5-2-2). to the user side (5-2); when heating in winter, the ground source heat pump (5-1) extracts heat from the rotating buried pipe energy storage component (2) below the ground, and hot water enters the ground source heat pump (5-1) through the energy storage component outlet pipe (2-7) and the ground source heat pump inlet pipe (5-1-1), and is further heated in the ground source heat pump (5-1) before being transported to the user side (5-2) for heating. The ground source heat pump (5-1) transports the cold from the user side (5-2) through the ground source heat pump outlet pipe (5-1-2) and the energy storage component inlet pipe (2-5) to the medium layer (2-16) of the rotating buried pipe energy storage component (2) below the ground, completing the cooling and heating cycle; When the hot water supply mode is in operation: the collector water outlet control valve (4-8), the collector water inlet control valve (4-9), the heat storage component circulation water pump (4-7) and the hot water supply component (6) are opened, and the other valves and water pumps are closed; the water in the hot water storage tank (4-2) flows into the solar collector (4-1) through the collector water inlet pipe (4-1-2), absorbs solar energy in the solar collector (4-1) to increase the water temperature, and then enters the hot water storage tank (4-2) through the collector water outlet pipe (4-1-1), completing the solar energy collection; the hot water in the hot water storage tank (4-2) is circulated. The water passes through the hot water tank outlet pipe (4-2-1) and the first heat exchanger inlet pipe (6-1-1) and enters the plate heat exchanger (6-1), exchanges heat with water from the second heat exchanger inlet pipe (6-1-2); the water whose temperature is reduced after the heat exchange enters the hot water tank (4-2) through the first plate heat exchanger outlet pipe (6-1-3) and the hot water tank inlet pipe (4-2-2) and is heated again; the water in the second heat exchanger inlet pipe (6-1-2) is heated by the hot water from the hot water tank (4-2) and is supplied to users through the second heat exchanger inlet pipe (6-1-4), thereby realizing the supply of domestic hot water.

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