Heat storage water tank and water circulation heat storage system

Abstract

The utility model relates to a heat storage water tank and a water circulation heat storage system, and belongs to agriculture and forestry facilities, the water circulation heat storage system comprises at least one water tank, a plurality of heat storage water tanks, a water return main pipe and a plurality of inter-row water pipes, and a water inlet of a tank body of each heat storage water tank is communicated with a water outlet of the water tank through a water feeding pipe; the water return main pipe is communicated with a water outlet of the tank body of each heat storage water tank through a water return branch pipe; the plurality of inter-row water pipes are respectively arranged in one planting row, and the water inlet end of the inter-row water feeding pipe part and the water return end of the inter-row water return pipe part of each inter-row water pipe are arranged on the water return main pipe; the tail end of the water return main pipe is communicated with a water inlet of the water tank through a pipeline to form a circulating pipe network of a waterway.

Description

Technical Field

[0001] This utility model relates to agricultural and forestry facilities, specifically to a hot water storage tank and a water circulation heat storage system. Background Technology

[0002] Currently, newly built flexible greenhouses have eliminated walls and lack heat storage structures, resulting in generally low temperatures that fail to meet design requirements and thus cannot satisfy the needs of crop growth.

[0003] Therefore, newly built flexible greenhouses primarily use water-based heat storage for heating, employing methods such as water bags, water walls, and phase change materials. However, even with current heating methods, existing greenhouses cannot recycle the water in the water tanks, resulting in poor heat storage and low heat utilization efficiency. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this utility model is to provide a hot water storage tank and a water circulation heat storage system, which solves the current problems of poor heat storage effect and low heat utilization efficiency in greenhouses, which cannot circulate the water between the tanks.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] Firstly, this utility model discloses a hot water storage tank, comprising a tank body.

[0007] The box body is provided with multiple partitions, which divide the box body into multiple cavities. The bottom and top of adjacent cavities are provided with channels, and each pair of adjacent cavities are connected by the bottom channel or the top channel.

[0008] The first partition and the side wall of the box form a first cavity, and the last partition and the side wall of the box form a last cavity. The outer walls of the first cavity and the last cavity are respectively provided with water inlet and water outlet.

[0009] The inlet, the first cavity, the second cavity, ..., the last cavity and the outlet together form a curved water transport channel.

[0010] Preferably, the first partition is fixed to the top of the inner wall of the box, the last partition is fixed to the top of the inner wall of the box, and the intermediate partitions are fixed at intervals to the bottom and top of the inner wall of the box, so that the partitions at the top or bottom of each adjacent two cavities form a channel with the inner wall of the box.

[0011] Preferably, the housing includes a base portion, a transition portion, and a main body portion, wherein the width of the main body portion is smaller than that of the base portion, and the base portion and the main body portion are connected by the transition portion.

[0012] Preferably, the water inlet and the water outlet are respectively located on both sides of the tank body, wherein the water inlet is located at the top of the first cavity and is connected to the first cavity, and the water outlet is located on the bottom side wall of the last cavity and is connected to the last cavity.

[0013] Secondly, this utility model also discloses a water circulation heat storage system, installed in a planting area, the planting area including multiple planting rows, the water circulation heat storage system comprising:

[0014] A water tank, pre-filled with water, with a water pump installed in the water;

[0015] Several of the above-mentioned hot water storage tanks, each of which has its inlet connected to its outlet via a water supply pipe;

[0016] A main return water pipe is connected to the outlet of each hot water storage tank via a branch return water pipe.

[0017] Multiple inter-row water pipes are installed in a planting row. Each inter-row water pipe includes an inter-row water supply pipe and an inter-row water return pipe. The outlet end of the inter-row water supply pipe and the inlet end of the inter-row water return pipe are connected to form the inter-row water pipe. The inlet end of the inter-row water supply pipe and the return end of the inter-row water return pipe of each inter-row water pipe are both located on the main return pipe.

[0018] The end of the main return water pipe is connected to the inlet of the water tank through a pipe, thereby forming a water circulation network.

[0019] Preferably, the water tank is equipped with an electric heating device, which is a heating copper tube installed inside the plate of the water tank, for heating the water stored in the water tank.

[0020] Preferably, a first water valve and a second water valve are respectively provided at the inlet end of the inter-row water supply pipe and the return end of the inter-row water return pipe in each inter-row water pipe, and a third water valve is provided on the main return pipe between the first water valve and the second water valve in each inter-row water pipe.

[0021] Preferably, the first water valve, the second water valve, and the third water valve are all solenoid valves.

[0022] Preferably, the end of the return water main is also provided with an air vent valve.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] (I) This utility model discloses a hot water storage tank, including a tank body. The tank body is provided with multiple partitions. The first partition and the side wall of the tank body form a first cavity, and the last partition and the side wall of the tank body form a last cavity. The outer walls of the first cavity and the last cavity are respectively provided with a water inlet and a water outlet. The water inlet, the first cavity, the second cavity, ..., the last cavity and the water outlet together form a curved water transport channel. The curved water transport channel allows the water to flow a longer path in the tank body, which is conducive to the "heat storage" water staying in the tank body as long as possible, and is also the basis for realizing water recycling.

[0025] (II) This utility model discloses a water circulation heat storage system, installed in a planting area. The planting area includes multiple planting rows for planting crops or trees. The water circulation heat storage system includes a water tank, several hot water storage tanks, a main return water pipe, and multiple inter-row water pipes. The water tanks are pre-filled with water, and a water pump is installed in the water. The inlet of each hot water storage tank is connected to the outlet of the tank via a water supply pipe. The main return water pipe is connected to each of the tanks via a return water branch pipe. The outlets of the hot water storage tank are interconnected. Multiple inter-row water pipes are installed within a planting row. Each inter-row water pipe includes an inlet water pipe and a return water pipe. The outlet of the inlet water pipe and the inlet of the return water pipe are connected to form an inter-row water pipe. The inlet of the inlet water pipe and the return water pipe of each inter-row water pipe are both located on the return water pipe. The end of the return water pipe is connected to the inlet of the water tank via a pipe, thereby forming a water circulation network. The water circulation heat storage system disclosed in this utility model enables the recycling of water between water tanks through its water circulation network.

[0026] (III) This utility model discloses a water circulation heat storage system that can store heat through sunlight during the day and dissipate it at night. When emergency heating is needed in extreme weather, heating copper pipes are installed inside the box to heat the water in the box. The water is then transported to the planting rows where crops or trees are planted through the inter-row water pipes to meet the temperature requirements for greenhouse plant growth and solve the problems of poor heat storage effect and low heat utilization efficiency. Attached Figure Description

[0027] Figure 1 This is an isometric view of the hot water storage tank provided in Embodiment 1 of this utility model;

[0028] Figure 2 This is an elevation view of the hot water storage tank provided in Embodiment 1 of this utility model;

[0029] Figure 3 This is a schematic diagram of the internal structure of the hot water storage tank provided in Embodiment 1 of this utility model;

[0030] Figure 4 This is a top view of the hot water storage tank provided in Embodiment 1 of this utility model;

[0031] Figure 5 This is a schematic diagram of the water circulation heat storage system provided in Embodiment 2 of this utility model;

[0032] Figure 6 This is a graph showing the relationship between temperature and time in a greenhouse under three sets of tests provided in Embodiment 2 of this utility model.

[0033] Attached diagram labeling: A - water inlet, B - water outlet, 100 - planting row;

[0034] 1-Box body, 10-Partition, 11-Base section, 12-Transition section, 13-Main body section;

[0035] 2-Water tank;

[0036] 3-Water supply pipe;

[0037] 4-Row water pipes;

[0038] 5-Return water main pipe, 50-Return water branch pipe, 51-Drain valve;

[0039] 61-First water valve, 62-Second water valve, 63-Third water valve. Detailed Implementation

[0040] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0041] To address the current problems of poor heat storage and low heat utilization efficiency in greenhouses due to the inability to recycle water in the water tanks, this invention discloses a hot water storage tank, comprising a tank body with multiple partitions inside. The first partition and the side wall of the tank body form a first cavity, and the last partition and the side wall of the tank body form a last cavity. The outer walls of the first cavity and the last cavity are respectively provided with a water inlet and a water outlet. The water inlet, the first cavity, the second cavity, ..., the last cavity and the water outlet together form a curved water transport channel. The curved water transport channel allows water to flow a longer path within the tank, which is beneficial for the "heat-storing" water to stay in the tank as long as possible, and is also the basis for realizing water recycling. Secondly, this utility model discloses a water circulation heat storage system, installed in a planting area. The planting area includes multiple planting rows for planting crops or trees. The water circulation heat storage system includes a water tank, several hot water storage tanks, a main return water pipe, and multiple inter-row water pipes. The water tanks are pre-filled with water, and a water pump is installed in the water. The inlet of each hot water storage tank is connected to the outlet of the tank via a water supply pipe. The main return water pipe is connected to each of the tanks via a return water branch pipe. The outlets of the hot water storage tank are interconnected. Multiple inter-row water pipes are installed within a planting row. Each inter-row water pipe includes an inlet water pipe and a return water pipe. The outlet of the inlet water pipe and the inlet of the return water pipe are connected to form an inter-row water pipe. The inlet of the inlet water pipe and the return water pipe of each inter-row water pipe are both located on the return water pipe. The end of the return water pipe is connected to the inlet of the water tank via a pipe, thereby forming a water circulation network. The water circulation heat storage system disclosed in this utility model enables the recycling of water between water tanks through its water circulation network.

[0042] Example 1: A hot water storage tank

[0043] Embodiment 1 of this utility model provides a water circulation heat storage tank, the structure of which will be described in detail below with reference to the accompanying drawings.

[0044] refer to Figures 1 to 4 The water circulation heat storage tank includes a tank 1.

[0045] The interior of the housing 1 is provided with multiple partitions 10, which divide the interior of the housing 1 into multiple cavities. Channels are provided at the bottom and top of adjacent cavities, and each pair of adjacent cavities is connected by a channel at the bottom or top. Specifically, the first and last partitions 10 are fixed to the top of the inner wall of the housing 1, respectively. The intermediate partitions 10 are fixed at intervals at the bottom and top of the inner wall of the housing 1, so that each pair of adjacent cavities in the middle forms a channel between the partition 10 at the top or bottom and the inner wall of the housing 1. More specifically, the first partition is fixed to the top of the inner wall of the housing 1, and subsequent partitions are staggered from the previous partition at the bottom and top of the inner wall of the housing 1, with the last partition fixed to the top of the inner wall of the housing 1. The bottom of the second cavity is connected to the bottom of the first cavity; the top of the third cavity is connected to the top of the second cavity; the bottom of the fourth cavity is connected to the bottom of the third cavity; the bottom of the first cavity is connected to the bottom of the second cavity, and the top of the second cavity is connected to the top of the cavity immediately following it; the last cavity is connected to the bottom of the first cavity.

[0046] The first partition 10 and the side wall of the box 1 form a first cavity, and the last partition 10 and the side wall of the box 1 form a last cavity. The outer walls of the first cavity and the last cavity are respectively provided with an inlet A and an outlet B.

[0047] The inlet A, the first cavity, the second cavity, ..., the last cavity and the outlet B together form a curved water transport channel.

[0048] When the container 1 is filled with water, it receives sunlight during the day and uses the high specific heat of water to receive and store heat. At night, the stored heat is released, thus achieving "heat storage".

[0049] Multiple partitions 10 together with the tank body 1 form a curved water transport channel. This curved water transport channel not only allows water to flow a longer path within the tank body 1, which is beneficial for the "heat-storing" water to stay in the tank body 1 as long as possible, but also forms the basis for realizing water recycling. In addition, the multiple partitions 10 also help to increase the strength of the tank body and prevent deformation.

[0050] As one specific implementation, the box body 1 is narrower at the top and wider at the bottom, especially wider at the bottom and narrower at the top, see specific reference. Figure 1 The housing 1 includes a base portion 11, a transition portion 12, and a main body portion 13. The width of the main body portion 13 is smaller than that of the base portion 11, and the base portion 11 and the main body portion 13 are connected by the transition portion 12.

[0051] Specifically, the inlet A and the outlet B are respectively located on both sides of the housing 1. The inlet A is located at the top of the first cavity and is connected to the first cavity, and the outlet B is located on the bottom side wall of the last cavity and is connected to the last cavity.

[0052] Specifically, the height of box 1 is 120-140cm, the width is 80-100cm, and the thickness is 15-20cm.

[0053] For more specific details, please refer to [link / reference]. Figures 2 to 4 The dimensions of the box 1 are as follows:

[0054] The base part 11 is cube-shaped, with a cross-sectional length of 1000mm, a width of 200mm, and a height of 300mm.

[0055] The transition part 12 is shaped like a quadrangular frustum with a height of 300mm, a bottom surface length of 1000mm and a width of 200mm, and a top surface length of 800mm and a width of 200mm.

[0056] The main body 13 is cube-shaped, with a cross-sectional length of 800mm, a width of 200mm, and a height of 900mm.

[0057] Example 2: A water circulation thermal storage system

[0058] Embodiment 2 of this utility model provides a water circulation heat storage system, which is set in a planting area. The planting area includes multiple planting rows 100, which are planted with crops or trees. There are reserved row spacing between the planting rows 100 for setting up inter-row water pipes 4. The structure is described in detail below with reference to the accompanying drawings.

[0059] refer to Figure 5 The water circulation thermal storage system includes:

[0060] At least one water tank 2, which is pre-filled with water and a water pump is installed in the water;

[0061] Several hot water storage tanks of Embodiment 1, wherein the water inlet A of the tank body 1 of each hot water storage tank is connected to the water outlet of the water tank 2 through a water supply pipe 3;

[0062] A main return water pipe 5 is connected to the outlet B of the body 1 of each hot water storage tank through a branch return water pipe 50.

[0063] Multiple inter-row water pipes 4 are respectively installed in a planting row 100. Each inter-row water pipe 4 includes an inter-row water supply pipe section and an inter-row water return pipe section. The water outlet of the inter-row water supply pipe section and the water inlet of the inter-row water return pipe section are connected to form the inter-row water pipe 4. The water inlet of the inter-row water supply pipe section and the water return of the inter-row water return pipe section of each inter-row water pipe 4 are both installed on the main water return pipe 5.

[0064] The end of the main return water pipe 5 is connected to the inlet of the water tank 2 through a pipe, thereby forming a water circulation network.

[0065] Specifically, the water tank 2, water pump, water inlet pipe 3, several water circulation heat storage tanks, return water branch pipe 50, return water main pipe 5, and inter-row water pipe 4 together form the circulation network of the water circuit.

[0066] Each row of water pipes 4 has a first water valve 61 and a second water valve 62 installed at the inlet end of the inlet water pipe and the return water pipe at the return water pipe. A third water valve 63 is installed on the return water main pipe 5 between the first water valve 61 and the second water valve 62 of each row of water pipes 4.

[0067] Specifically, the first water valve 61, the second water valve 62, and the third water valve 63 are all solenoid valves.

[0068] To facilitate the drainage of water, an air drain valve 51 is also provided at the end of the return water main pipe 5.

[0069] To heat the water stored in water tank 2, water tank 2 is equipped with an electric heating device, which is a heating copper pipe installed inside the plate of water tank 2, for heating the water stored in water tank 2. The water tank 2 heats the water in tank 1 through the electric heating device, thereby controlling the water temperature.

[0070] Specifically, the inlet end of the inlet pipe and the return end of the return pipe of each row water pipe 4 are connected to the main return pipe 5 with a flexible hose, which can be adjusted up and down with the growth height of the plant, while increasing the heat absorption area of ​​the water body during the day and increasing heat storage.

[0071] Specifically, the hot water storage tank can be designed to stand upright on its own, requiring only simple guardrails for support, thus reducing the cost of fixed tank structures.

[0072] The water circulation heat storage system provided in Example 2 can store heat through sunlight during the day and dissipate it at night. When emergency heating is needed in extreme weather, heating copper pipes are installed inside the plates of the water tank 2 to heat the water in the water tank 2. The water is then transported to the planting row 100 where crops or trees are planted through the inter-row water pipes 4 to meet the temperature requirements for greenhouse plant growth.

[0073] The design of the inter-row water pipeline layout and local heating firstly improves the heat storage efficiency of the water body during the day; secondly, it enables local heating at night, improving the heating effect; and finally, it increases the ability to cope with extreme weather.

[0074] Example 3: Application of a water circulation thermal storage system in agriculture

[0075] Embodiment 3 of this utility model provides an application of a water circulation heat storage system in agriculture, using the water circulation heat storage system of Embodiment 2, and the method includes the following steps:

[0076] Step 1: Design multiple rows of plants, with spacing between adjacent rows;

[0077] Step 2: Construct a water circulation network according to Example 2, including the following steps:

[0078] Multiple water circulation heat storage boxes of Embodiment 1 are arranged side by side on the back wall of the greenhouse and located at the end of each row of plants. The water inlet A of the multiple water circulation heat storage boxes is connected to the same water supply pipe 3, and the water outlet of the multiple water circulation heat storage boxes is connected to the same main return water pipe 5 through a return water branch pipe 50.

[0079] Each row of plants is equipped with a row water pipe 4 for heat dissipation and heat absorption. The inlet and outlet of each row water pipe 4 are located on the return water main 5.

[0080] Each row of water pipes 4 has a first valve and a second valve installed at its inlet and outlet, respectively, and a third valve installed on the row of water pipes 4 between the first valve and the second valve.

[0081] Step 3: Adjust the heating scheme according to the needs to achieve localized heating of the plants.

[0082] Specifically, when water needs to be supplied to the inter-row water pipe, the third water valve 63 is closed, and the first valve 61 and the second valve 62 are opened, and water flows through the inter-row water pipe 4;

[0083] When water is not needed to be supplied to the inter-row water pipe 4, close the first valve 61 and the second valve 62, open the third water valve 63, and water flows into the water tank 2 through the return water main pipe 5.

[0084] Step 4: When it is necessary to increase the water temperature of the inter-row water pipe 4, start the electric heating device to heat the water in the water tank 2;

[0085] After passing through the electric heating device, the water in the tank 1 first enters the water inlet pipe 3, and then is transported to the return water branch pipe 50 and the return water main pipe 5 through the water circulation heat storage tank, and finally to the inter-row water pipe 4 to achieve emergency heating under extreme weather conditions and transfer the heat to the crops or trees planted in the planting row 100.

[0086] Precautions for the application of water circulation thermal storage systems in agriculture include:

[0087] 1. Level and compact the soil at the bottom of the greenhouse back wall, and place the water circulation heat storage boxes at intervals according to the back wall frame. The number and spacing of the water circulation heat storage boxes can be adjusted according to the needs, and one box can be placed at 1 meter intervals.

[0088] 2. Lay a fixed net horizontally along the wall and install a fixed support every 5-8 water tanks to prevent the water tanks from tipping over;

[0089] 3. Connect the water inlet pipe 3 to the water inlet A of multiple boxes 1 respectively. The return water main pipe 5 is connected to the water outlet B of multiple boxes 1 through the return water branch pipe 50. Multiple inter-row water pipes 4 are connected through the return water main pipe 5.

[0090] 4. Connect the electric heating furnace and the circulating pump to one end of the overall pipeline;

[0091] 5. Fill the tank with water through the water inlet of the water inlet and expel the air;

[0092] 6. Under normal weather conditions, turn on the circulation pump to circulate the water throughout the body, and adjust the heating pipes between the plant rows to the flower spikes for localized heating to improve the heating effect.

[0093] 7. In case of extreme weather or insufficient temperature, turn on the electric heater to heat the water in an emergency. The electric heater is equipped with a temperature controller.

[0094] Example 4: Application in agriculture

[0095] From December 2023 to March 2024, the application examples of the water circulation thermal storage system in agriculture in Example 2 are summarized as follows:

[0096] A demonstration was conducted in a solar greenhouse at the Yujiawu Demonstration Base in Tongzhou District, Beijing. The greenhouse has a span of 10 meters and a length of 60 meters. It was divided into five 12-meter sections using a metal frame and thickened film. Three sets of experiments were conducted on the three middle sections:

[0097] Control group: No heat storage treatment was performed; designated as CK.

[0098] Heating unit: Equipped with a circulating hot water storage tank and heated by a 2KW electric heater, designated as T1;

[0099] Non-heating group: Equipped with a circulating hot water storage tank, but without heating, numbered T2.

[0100] Temperatures inside the greenhouse were continuously recorded using a Tsinghua Tongfang RHLOG automatic temperature recorder, with data collected hourly. An investigation was also conducted on the cultivated spinach and tomatoes, as shown in Table 1.

[0101] Table 1. Greenhouse spinach yield data under different heat storage treatments

[0102] Group Spinach yield per square meter (unit: kg) control group CK 2.18 Heating group T1 3.29 Unheated group T2 2.93

[0103] Depend on Figure 6 The data shows that on the same day, the average temperature of the heated group (T1) was higher than that of the unheated group (T2), which was higher than that of the control group (CK). The lowest temperature occurred on December 22, 2023. The heated group (T1) was 4.91℃ higher than the control group (CK), and the unheated group (T2) was 2.88℃ higher than the control group (CK), significantly increasing nighttime temperatures. Spinach yields increased by 50.92% and 34.40% respectively, demonstrating significant effects.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A hot water storage tank, characterized in that, Includes a box (1), The box (1) is provided with multiple partitions (10) inside, which divide the box (1) into multiple cavities. The bottom and top of adjacent cavities are provided with channels, and each pair of adjacent cavities are connected by the bottom channel or the top channel. The first partition (10) and the side wall of the box (1) form the first cavity, and the last partition (10) and the side wall of the box (1) form the last cavity. The outer walls of the first cavity and the last cavity are respectively provided with an inlet (A) and an outlet (B). The inlet (A), the first cavity, the second cavity, ..., the last cavity and the outlet (B) together form a curved water transport channel.

2. The hot water storage tank according to claim 1, characterized in that, The first partition is fixed to the top of the inner wall of the box (1), the last partition is fixed to the top of the inner wall of the box (1), and the middle partitions (10) are fixed at intervals to the bottom and top of the inner wall of the box (1) so that each adjacent two cavities in the middle form a channel between the partitions (10) at the top or bottom and the inner wall of the box (1).

3. The hot water storage tank according to claim 1, characterized in that, The housing (1) includes a base (11), a transition section (12), and a main body (13). The width of the main body (13) is smaller than that of the base (11), and the base (11) and the main body (13) are connected by a transition part (12).

4. The hot water storage tank according to claim 1, characterized in that, The inlet (A) and the outlet (B) are respectively located on both sides of the housing (1). The inlet (A) is located at the top of the first cavity and is connected to the first cavity. The outlet (B) is located on the side wall at the bottom of the last cavity and is connected to the last cavity.

5. A water-circulating heat storage system, installed in a planting area, said planting area comprising multiple planting rows (100), characterized in that, include: A water tank (2) is pre-filled with water and a water pump is installed in the water; The hot water storage tanks according to any one of claims 1 to 4, wherein the inlet (A) of the tank body (1) of each hot water storage tank is connected to the outlet of the water tank (2) through a water supply pipe (3); A main return water pipe (5) is connected to the outlet (B) of the tank body (1) of each hot water storage tank through a branch return water pipe (50); Multiple inter-row water pipes (4) are respectively set in a planting row (100). Each inter-row water pipe (4) includes an inter-row water supply pipe section and an inter-row water return pipe section. The water outlet of the inter-row water supply pipe section and the water inlet of the inter-row water return pipe section are connected to form the inter-row water pipe (4). The water inlet of the inter-row water supply pipe section and the water return of the inter-row water return pipe section of each inter-row water pipe (4) are both set on the main water return pipe (5). The end of the return water main (5) is connected to the inlet of the water tank (2) through a pipe, thereby forming a water circulation network.

6. The water circulation heat storage system according to claim 5, characterized in that, The water tank (2) is equipped with an electric heating device, which is a heating copper pipe installed inside the plate of the water tank (2) for heating the water stored in the water tank (2).

7. The water circulation thermal storage system according to claim 5, characterized in that, Each inter-row water pipe (4) has a first water valve (61) and a second water valve (62) installed at the inlet end of the inter-row water supply pipe and the return end of the inter-row water return pipe. A third water valve (63) is installed on the main return pipe (5) between the first water valve (61) and the second water valve (62) of each inter-row water pipe (4).

8. The water circulation heat storage system according to claim 7, characterized in that, The first water valve (61), the second water valve (62) and the third water valve (63) are all solenoid valves.

9. The water circulation heat storage system according to claim 5, characterized in that, The end of the return water main pipe (5) is also equipped with an air drain valve (51).

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