Low-temperature area switchable capacity-increasing energy storage type solar centralized water supply system

Abstract

A switchable capacity-increasing energy storage type solar centralized water supply system in a low-temperature area comprises a water supplementing subsystem, a solar temperature adjusting subsystem and a hot water supply circulation subsystem. The water supplementing subsystem comprises a water supplementing pipe; the solar temperature adjusting subsystem comprises a heating tank, a solar heat collector, a circulating pump set, an energy storage container, an energy storage capacity increasing container, a first direct connecting pipe and a second direct connecting pipe. The hot water supply circulation subsystem comprises a heat supply variable frequency booster pump set, a user hot water pipe network and a water return pipe. According to the utility model, the energy storage can be adjusted through the adjustable closed loop control, i.e., the capacity of the working medium for energy storage is increased when the sunlight is short or the occupancy rate of users in buildings such as hotels is increased, and the capacity of the working medium for energy storage is reduced when the sunlight is long or the occupancy rate of users in buildings such as hotels is reduced. Meanwhile, the defects that the service life of a heat storage working medium is short, the energy consumption is increased, the service life of equipment is shortened and the like caused by a large working medium container without adjustable energy storage are overcome.

Description

Technical Field

[0001] This utility model relates to the field of centralized heating, and in particular to a solar-powered centralized heating system. Background Technology

[0002] The biggest problem faced in the use of solar centralized heating is that the period of solar irradiance meets the standard and the heat required by users for hot water does not match. That is, users use less hot water during the period of high solar irradiance, but use more at night when there is no sunlight. For example, in building hot water supply, the evening is obviously the peak period for hot water use, but there is no solar irradiance to be used at the same time. This requires energy storage to make full use of solar irradiance during the day.

[0003] Meanwhile, the significant changes in user volume also cause changes in daytime energy storage demand. For example, hotels have significant differences between peak and off-peak occupancy periods. This requires that the heat storage capacity of the solar centralized water supply system be adjustable so that changes in user heating water demand are synchronized with changes in the system's heat storage capacity.

[0004] Furthermore, given my country's vast territory, the solar energy guarantee rate varies across regions, and some areas experience short daytime sunshine hours in certain months. This necessitates a significant increase in the system's heat storage capacity to address this adverse effect and ensure uninterrupted heating.

[0005] Simply using a large-capacity, non-adjustable heat storage tank to increase the heat storage capacity of the working fluid inside the tank also causes the following problems:

[0006] The lifespan of the heat storage medium is shortened. The use of a heat storage tank with a non-adjustable volume leads to the long-term use of a large volume of heat storage medium, which may cause the high-temperature medium to crack, decompose, volatilize, or oxidize, thus affecting the service life of the heat storage medium.

[0007] Increased energy consumption. Continuing to use high heat storage capacity during periods of lower heat storage demand causes the circulating water pumps of the thermal collector system to operate at high intensity, increasing electricity consumption.

[0008] Reduced equipment lifespan. Continuing to use high heat storage capacity during periods of lower heat storage demand leads to high-intensity operation of the circulating water pumps in the heat collection system, reducing their lifespan. Continuous high-temperature operation and corrosion from the high-temperature working fluid also shorten the lifespan of the heat collection system's pipes and other components. Utility Model Content

[0009] To overcome the above-mentioned defects, the technical problem to be solved by this utility model is to provide a simple-to-operate switchable capacity-increasing energy storage solar centralized water supply system for low-temperature areas, so that the heat storage capacity can change with the change of heat storage demand.

[0010] Therefore, the purpose of this utility model is to propose a switchable capacity-increasing energy storage solar centralized water supply system for low-temperature areas, including: a water replenishment subsystem, a solar temperature regulation subsystem, and a hot water circulation subsystem;

[0011] The water replenishment subsystem includes water replenishment pipes;

[0012] The solar temperature regulation subsystem includes a heating tank, a solar collector, a circulating pump set, an energy storage container, an energy storage capacity expansion container, a first direct connection pipe, and a second direct connection pipe;

[0013] The hot water circulation subsystem includes: a heating variable frequency booster pump set, a user hot water pipe network, and a return water pipe;

[0014] The heating frequency booster pump set, the user hot water pipe network, and the return water pipe are connected sequentially along the water flow direction;

[0015] The heating tank includes an inlet pipe, a heating pipe, an electric heater, a temperature sensor, and a level gauge;

[0016] The outlet of the return water pipe and the water supply pipe are connected to the inlet of the water inlet pipe, which extends into the bottom of the heating tank.

[0017] The inlet and outlet ends of the heating pipe are connected to the first direct connecting pipe. The inlet and outlet pipe sections of the first direct connecting pipe are equipped with electric valves. The heating pipe is embedded inside the heating tank. The inlet and outlet pipes of the heating pipe are each equipped with an electric valve.

[0018] The electric heater, level gauge, and temperature sensor are embedded in the heating tank.

[0019] The outlet of the heating tank is connected to a variable frequency booster pump set for heating.

[0020] The liquid outlet of the first direct connection pipe is connected to the liquid inlet of the solar collector and the liquid outlet of the second direct connection pipe. The second direct connection pipe is equipped with an electric valve. The liquid inlet pipe of the solar collector is equipped with an electric valve. The liquid outlet of the solar collector is equipped with a temperature sensor.

[0021] The outlet of the circulating pump unit is connected to the inlet of the first direct-connection pipe;

[0022] The inlet end of the circulating pump unit is provided with a first connecting pipe that is connected to the circulating pump unit.

[0023] The first connecting pipe is equipped with an electric valve;

[0024] The energy storage container is provided with a second connecting pipe extending into the energy storage container, a level gauge and a temperature sensor embedded in the energy storage container, and a fifth connecting pipe located at the liquid outlet below the energy storage container;

[0025] The fifth connecting pipe is equipped with an electric valve;

[0026] The fifth connecting pipe is connected to the liquid outlet and then to the liquid inlet of the circulating pump unit.

[0027] The second connecting pipe is equipped with an electric valve;

[0028] The energy storage and capacity expansion container is provided with a third connecting pipe extending into the energy storage and capacity expansion container, a level gauge and a temperature sensor embedded in the energy storage and capacity expansion container, and a fourth connecting pipe located at the liquid outlet above the energy storage and capacity expansion container.

[0029] The fourth connecting pipe is equipped with an electric valve, and the liquid outlet of the fourth connecting pipe is connected to the bottom of the energy storage container.

[0030] The solar collector and the parallel liquid outlet of the second straight connecting pipe are connected to the parallel liquid inlet of the first connecting pipe, the second connecting pipe, and the third connecting pipe.

[0031] The energy storage container and the energy storage capacity expansion container store the working medium respectively.

[0032] The above-mentioned equipment forms multiple water heating / working fluid heat storage circulation control loops by opening and closing electric valves, and at the same time realizes the adjustable working fluid heat storage capacity.

[0033] Furthermore, the water replenishment subsystem also includes municipal pipelines, flow stabilization tanks, water softeners, water tanks, silicon phosphate crystal processors, and a second bypass pipe;

[0034] Municipal pipelines, flow stabilizer tanks, water softeners, and water tanks are connected in sequence.

[0035] An electric valve is installed at the connection point between the municipal pipeline and the flow stabilizing tank.

[0036] A booster pump is installed at the connection pipe between the flow stabilizer tank and the water softener;

[0037] A float valve is installed at the outlet end of the connecting pipe between the water softener and the water tank.

[0038] A first bypass pipe is provided outside the water tank. The inlet end of the first bypass pipe is connected to the outlet end of the municipal pipeline, and the outlet end of the first bypass pipe is connected to the water tank.

[0039] The first bypass pipe is equipped with an electric valve, and the outlet end of the first bypass pipe is equipped with a float valve;

[0040] The water tank is equipped with a level gauge, and the outside of the water tank is equipped with a laundry room variable frequency booster pump, a user variable frequency booster pump set, and a water replenishment pump;

[0041] The water tank outlet is connected to the inlet of the parallel pipe of the laundry room variable frequency booster pump, the user variable frequency booster pump set, and the water supply pump.

[0042] The water pump, silicon phosphate crystal processor, and water supply pipe are connected in sequence.

[0043] The inlet and outlet of the silicon phosphate crystal processor are connected to a second bypass pipe.

[0044] An electric valve is installed at the second bypass pipe.

[0045] The above equipment performs two-step water treatment:

[0046] Step 1: Use a water softener to treat municipal water for use in laundry rooms or for daily water use. A corresponding variable frequency booster pipeline is also provided.

[0047] The second step, building upon water softening, involves using a silicon phosphate crystal processor to further process the water, resulting in dissolved silicon phosphate crystals in the hot water. Its main components, polyphosphates and polysilicates, act as scale inhibitors and metal corrosion protectants in the water, extending equipment lifespan, reducing maintenance costs, and helping to maintain the stability and quality of the hot water supply.

[0048] Furthermore, the working fluid is an antifreeze composed of a mixture of organic alcohols and water.

[0049] In low-temperature regions, winter antifreeze factors should be considered. Therefore, antifreeze mixtures of organic alcohols and water are used to ensure both a high boiling point and a low melting point, as well as a high heat capacity.

[0050] The operation method of the solar temperature regulation subsystem is as follows.

[0051] Parameter settings:

[0052] The temperature monitored by the temperature sensor of the heating tank is T1;

[0053] The temperature monitored by the temperature sensor at the liquid outlet of the solar collector is T2;

[0054] The temperature monitored by the temperature sensor of the energy storage container is T3;

[0055] The temperature monitored by the temperature sensor of the energy storage capacity expansion container is T4;

[0056] 1) Heating steps for water stored in the heating tank:

[0057] A) When both T1≤45℃ and T2-T1≥5℃ are met, the steps for heating the water stored in the heating tank by the solar collector are as follows:

[0058] The two electric valves of the inlet and outlet pipes of the heating pipe are opened, the electric valve of the inlet pipe of the solar collector is opened, the electric valve of the first connecting pipe is opened, the other electric valves in the solar temperature regulation subsystem are closed, and the circulation pump group is turned on. At this time, the solar water supply subsystem forms a circulation control loop for water heating using the solar collector. That is, the loop is a circulation control loop composed of the circulation pump group, the front section of the first direct connecting pipe, the heating pipe, the rear section of the first direct connecting pipe, the solar collector, and the first connecting pipe connected in a closed loop in sequence, realizing the heating of the water stored in the heating tank.

[0059] When T1 ≥ 50℃, this step ends and the above equipment stops operating;

[0060] B) In cases where the initial estimated hot water demand from users is small, or the sunshine duration is long, and only the energy storage container is used for energy storage, when simultaneously meeting the following conditions: T1≤45℃, T2-T1≤5℃, and T3-T1≥5℃, the energy stored in the energy storage container heats the water stored in the heating tank. This refers to the steps where the working fluid temperature inside the solar collector is insufficient, but the working fluid in the energy storage container has sufficient energy to heat the water stored in the heating pipes.

[0061] Two electric valves in the inlet and outlet pipes of the heating pipe are opened, as are three electric valves in the second direct connection pipe, the second connecting pipe, and the fifth connecting pipe. Other electric valves in the solar temperature regulation subsystem are closed, and the circulation pump group is turned on. At this time, the solar water supply subsystem forms a circulation control loop that uses the heat stored in the energy storage container to heat water. This loop consists of a circulation pump group, the front section of the first direct connection pipe, the heating pipe, the rear section of the first direct connection pipe, the second direct connection pipe, the second connecting pipe, the energy storage container, and the fifth connecting pipe connected in a closed loop in sequence, thus realizing the heating of the water stored in the heating tank.

[0062] When T1 ≥ 50℃, this step ends and the above equipment stops operating;

[0063] C) When the user's required hot water volume is large, or the available solar energy is low due to low sunshine duration, and the energy storage container and the energy storage expansion container jointly store energy, if T1≤45℃, T2-T1≤5℃ and T4-T1≥5℃ are simultaneously met, the combined energy stored in the energy storage container and the energy storage expansion container will heat the water stored in the heating tank. This means that even if the working fluid temperature in the solar collector is not up to standard, the total working fluid energy stored in the energy storage container and the energy storage expansion container is sufficient to heat the water stored in the heating pipe.

[0064] Two electric valves in the inlet and outlet pipes of the heating pipe are opened, and four electric valves in the second direct connection pipe, third connecting pipe, fourth connecting pipe, and fifth connecting pipe are opened. Other electric valves in the solar temperature regulation subsystem are closed, and the circulation pump group is turned on. At this time, the solar water supply subsystem forms a circulation control loop that uses the heat stored in the energy storage container and the energy storage expansion container to heat the water. That is, the loop is a circulation control loop consisting of the circulation pump group, the front section of the first direct connection pipe, the heating pipe, the rear section of the first direct connection pipe, the second direct connection pipe, the third connecting pipe, the energy storage expansion container, the fourth connecting pipe, the energy storage container, and the fifth connecting pipe connected in a closed loop in sequence, which realizes the heating of the water stored in the heating tank.

[0065] When T1 ≥ 50℃, this step ends and the above equipment stops operating;

[0066] D) When there are few users resulting in a small demand for hot water, and only the energy storage container is used for energy storage, and the following conditions are met simultaneously: T1≤45℃, T2-T1≤5℃, T3-T1≤5℃; or when there are many users resulting in a large demand for hot water, and the energy storage container and the energy storage expansion container are used for joint energy storage, and the following conditions are met simultaneously: T1≤45℃, T2-T1≤5℃, T4-T1≤5℃, i.e., in the initial stage where either the energy storage container or the combined energy storage container and the energy storage expansion container are used for energy storage, the stored energy is insufficient to heat the water stored in the heating pipe to the required standard. Therefore, the water stored in the heating tank can only be supplemented by an electric heater.

[0067] The two electric valves in the inlet and outlet pipes of the heating pipe are closed, and the electric heater is turned on;

[0068] When T1 ≥ 50℃, the electric heater stops operating, and this step ends.

[0069] 2) Working fluid heat storage steps:

[0070] A) When there are few users and the required hot water volume is small, or it is a month with long sunshine hours, and only the energy storage container is storing energy, when T1≥45℃ and T2-T3≥5℃, the steps for the solar collector to heat and store the working fluid in the energy storage container are as follows:

[0071] The four electric valves of the first direct connecting pipe, the solar collector, the second connecting pipe, and the fifth connecting pipe are opened, the other electric valves in the solar temperature regulation subsystem are closed, and the circulation pump group is turned on.

[0072] At this point, the solar water supply subsystem forms a loop control system that uses solar energy to store heat in the energy storage container. This loop consists of a loop control system consisting of a circulating pump group, a first direct connecting pipe, a solar collector, a second connecting pipe, an energy storage container, and a fifth connecting pipe connected in a closed loop in sequence, which realizes the storage of heat in the working fluid inside the energy storage container.

[0073] When T2-T3≤5℃, this step ends and the above equipment stops operating;

[0074] B) When there are many users resulting in a large demand for hot water, or during periods of unfavorable sunlight, and energy is stored jointly by an energy storage container and an energy storage expansion container, the steps for the solar collector to heat and store the working fluid in the energy storage container and the energy storage expansion container are as follows: When T1≥45℃ and T2-T3≥5℃,

[0075] The five electric valves of the first direct connecting pipe, the solar collector, the third connecting pipe, the fourth connecting pipe, and the fifth connecting pipe are open, the other electric valves in the solar temperature regulation subsystem are closed, and the circulation pump group is turned on.

[0076] At this point, the solar water supply subsystem forms a loop control system that uses solar energy to store heat in both the energy storage container and the energy storage expansion container. This loop consists of a circulating pump group, a first direct connecting pipe, a solar collector, a third connecting pipe, an energy storage expansion container, a fourth connecting pipe, an energy storage container, and a fifth connecting pipe connected in a closed loop. This loop enables the energy storage container and the energy storage expansion container to store heat together.

[0077] When T2-T3≤5℃, this step ends and the above equipment stops operating.

[0078] The advantages and positive effects of this invention are as follows: Through adjustable closed-loop control, the energy storage can be adjusted. Specifically, the capacity of the energy storage medium is increased during periods of shorter sunshine hours or when occupancy rates in hotels and other buildings increase, while the capacity is reduced during periods of longer sunshine hours or when occupancy rates decrease. This adapts to the adverse effects of fluctuations in occupancy rates and sunshine conditions, while avoiding the drawbacks of large, non-adjustable energy storage containers, such as shortened lifespan of the heat storage medium, increased energy consumption, and reduced equipment lifespan. Furthermore, the supplied hot water undergoes softening and silicon phosphate crystal treatment beforehand, significantly delaying scaling and metal corrosion in the hot water supply network. Attached Figure Description

[0079] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0080] Figure 1 This is a schematic diagram of the switchable capacity-increasing energy storage solar-powered centralized water supply system for low-temperature regions according to this utility model.

[0081] In the diagram, the components are: Water Replenishment Subsystem-1, Municipal Pipeline-11, Flow Stabilizer-12, Water Softener-13, Booster Pump-131, Water Tank-14, Laundry Room Variable Frequency Booster Pump-141, User Variable Frequency Booster Pump Set-142, Water Replenishment Pump-143, First Bypass Pipe-144, Silicon Phosphorus Crystal Processor-15, Water Replenishment Pipe-16, Second Bypass Pipe-17, Solar Temperature Regulation Subsystem-2, Heating Tank-21, Inlet Pipe-211, Heating Pipe-212, Electric Heater-213, and Solar Collector. -22, Circulating pump set -23, First connecting pipe -231, Energy storage container -24, Second connecting pipe -241, Fifth connecting pipe -242, Energy storage capacity expansion container -25, Third connecting pipe -251, Fourth connecting pipe -252, First direct connecting pipe -26, Second direct connecting pipe -27, Hot water circulation subsystem -3, Heating variable frequency booster pump set -31, User hot water network -32, Return water pipe -33, Temperature sensor -a, Electric valve -b, Float valve -c, Level gauge -d, Working fluid -e. Detailed Implementation

[0082] The present invention will now be described in more detail with reference to the accompanying drawings, which illustrate preferred embodiments of the invention. It should be understood that those skilled in the art can modify the invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the invention.

[0083] like Figure 1 As shown, Example 1:

[0084] A switchable capacity-increasing energy storage solar-powered centralized water supply system for low-temperature regions includes: a water replenishment subsystem 1, a solar temperature regulation subsystem 2, and a hot water circulation subsystem 3.

[0085] Water replenishment subsystem 1 includes water replenishment pipe 16;

[0086] The solar temperature regulation subsystem 2 includes a heating tank 21, a solar collector 22, a circulating pump group 23, an energy storage container 24, an energy storage capacity expansion container 25, a first direct connection pipe 26, and a second direct connection pipe 27.

[0087] The hot water circulation subsystem 3 includes: a heating variable frequency booster pump set 31, a user hot water pipe network 32, and a return water pipe 33;

[0088] The heating frequency converter booster pump set 31, the user hot water pipe network 32, and the return water pipe 33 are connected sequentially along the water flow direction;

[0089] Heating tank 21 includes water inlet pipe 211, heating pipe 212, electric heater 213, temperature sensor a, and level gauge d;

[0090] The outlet of the return water pipe 33 and the water supply pipe 16 are connected to the inlet of the water inlet pipe 211, which extends into the bottom of the heating tank 21.

[0091] The inlet and outlet ends of the heating pipe 212 are connected to the first direct connecting pipe 26. The inlet and outlet pipe sections of the first direct connecting pipe 26 are equipped with electric valves b. The heating pipe 212 is embedded inside the heating tank 21. The inlet and outlet pipes of the heating pipe 212 are respectively equipped with electric valves b.

[0092] The electric heater 213, the level gauge d, and the temperature sensor a are respectively embedded in the heating tank 21.

[0093] The outlet of heating tank 21 is connected to heating variable frequency booster pump set 31;

[0094] The liquid outlet of the first direct connecting pipe 26 is connected to the parallel liquid inlet of the solar collector 22 and the second direct connecting pipe 27. The second direct connecting pipe 27 is equipped with an electric valve b. The liquid inlet pipe of the solar collector 22 is equipped with an electric valve b. The liquid outlet of the solar collector is equipped with a temperature sensor a.

[0095] The outlet end of the circulating pump unit 23 is connected to the inlet end of the first direct connecting pipe 26;

[0096] The inlet end of the circulating pump unit 23 is provided with a first connecting pipe 231 that is connected to the circulating pump unit;

[0097] The first connecting pipe 231 is equipped with an electric valve b;

[0098] The energy storage container 24 is provided with a second connecting pipe 241 extending into the energy storage container, a liquid level gauge d and a temperature sensor a embedded in the energy storage container, and a fifth connecting pipe 242 located at the liquid outlet below the energy storage container;

[0099] The fifth connecting pipe 242 is equipped with an electric valve b;

[0100] The fifth connecting pipe 242 is connected to the liquid outlet and then to the liquid inlet of the circulating pump unit 23;

[0101] The second connecting pipe 241 is equipped with an electric valve b;

[0102] The energy storage and capacity expansion container 25 is provided with a third connecting pipe 251 extending into the energy storage and capacity expansion container, a level gauge d and a temperature sensor a embedded in the energy storage and capacity expansion container, and a fourth connecting pipe 252 located at the liquid outlet above the energy storage and capacity expansion container.

[0103] The fourth connecting pipe 252 is equipped with an electric valve b, and the liquid outlet end of the fourth connecting pipe is connected to the lower part of the energy storage container 24;

[0104] The parallel liquid outlet of the solar collector 22 and the second straight connecting pipe 27 are connected to the parallel liquid inlet of the first connecting pipe 231, the second connecting pipe 241, and the third connecting pipe 251.

[0105] The energy storage container 24 and the energy storage capacity expansion container 25 respectively store the working medium e.

[0106] Preferably, the water replenishment subsystem 1 also includes a municipal pipeline 11, a flow stabilizer tank 12, a water softener 13, a water tank 14, a silicon phosphate crystal processor 15, and a second bypass pipe 17;

[0107] Municipal pipeline 11, flow stabilizer 12, water softener 13, and water tank 14 are connected in sequence;

[0108] An electric valve b is installed at the connection point between the municipal pipeline 11 and the flow stabilizer tank 12;

[0109] A booster pump 131 is installed at the connection pipe between the flow stabilizer tank 12 and the water softener 13;

[0110] A float valve c is installed at the outlet end of the connecting pipe between the water softener 13 and the water tank 14;

[0111] A first bypass pipe 144 is provided outside the water tank 14. The inlet end of the first bypass pipe is connected to the outlet end of the municipal pipeline 11, and the outlet end of the first bypass pipe is connected to the water tank 14.

[0112] The first bypass pipe 144 is equipped with an electric valve b, and the water outlet end of the first bypass pipe is equipped with a float valve c;

[0113] The water tank 14 is equipped with a level gauge d, and the water tank 14 is equipped with a laundry room variable frequency booster pump 141, a user variable frequency booster pump group 142, and a water replenishment pump 143.

[0114] The outlet of water tank 14 is connected to the inlet of the parallel pipe of laundry room variable frequency booster pump 141, user variable frequency booster pump group 142, and water replenishment pump 143.

[0115] The water pump 143, the silicon phosphor crystal processor 15, and the water supply pipe 16 are connected in sequence.

[0116] The water inlet and outlet of the silicon phosphor crystal processor 15 are connected to the second bypass pipe 17.

[0117] An electric valve b is installed at point 17 of the second bypass pipe.

[0118] Preferably, the working fluid e is an antifreeze composed of a mixture of organic alcohols and water.

[0119] The present invention has been described in detail above through embodiments, but the content is only a preferred embodiment of the present invention and should not be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made in accordance with the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A switchable capacity-increasing energy storage solar-powered centralized water supply system for low-temperature regions, characterized in that, include: Water replenishment subsystem (1), solar temperature regulation subsystem (2), hot water circulation subsystem (3); The water replenishment subsystem (1) includes a water replenishment pipe (16); The solar temperature regulation subsystem (2) includes a heating tank (21), a solar collector (22), a circulating pump group (23), an energy storage container (24), an energy storage capacity expansion container (25), a first direct connection pipe (26), and a second direct connection pipe (27). The hot water circulation subsystem (3) includes: a heating frequency conversion booster pump set (31), a user hot water pipe network (32), and a return water pipe (33). The heating frequency conversion booster pump set (31), the user hot water pipe network (32), and the return water pipe (33) are connected sequentially along the water flow direction; The heating tank (21) includes a water inlet pipe (211), a heating pipe (212), an electric heater (213), a temperature sensor (a), and a level gauge (d). The outlet of the return water pipe (33) and the water supply pipe (16) are connected to the inlet of the water inlet pipe (211), which extends into the bottom of the heating tank (21). The inlet and outlet ends of the heating pipe (212) are connected to the first straight pipe (26). The inlet and outlet pipe sections of the first straight pipe (26) are equipped with electric valves (b). The heating pipe (212) is embedded inside the heating tank (21). The inlet and outlet pipes of the heating pipe (212) are respectively equipped with the electric valves (b). The electric heater (213), the level gauge (d), and the temperature sensor (a) are respectively embedded in the heating tank (21); The outlet of the heating tank (21) is connected to the heating frequency booster pump group (31). The liquid outlet of the first direct connection pipe (26) is connected to the parallel liquid inlet of the solar collector (22) and the second direct connection pipe (27). The second direct connection pipe (27) is equipped with the electric valve (b). The liquid inlet pipe of the solar collector (22) is equipped with the electric valve (b). The liquid outlet of the solar collector is equipped with the temperature sensor (a). The outlet end of the circulating pump set (23) is connected to the inlet end of the first straight connecting pipe (26); The inlet end of the circulating pump group (23) is provided with a first connecting pipe (231) that is connected to the circulating pump group. The first connecting pipe (231) is equipped with the electric valve (b); The energy storage container (24) is provided with a second connecting pipe (241) extending into the energy storage container, a level gauge (d) and a temperature sensor (a) embedded in the energy storage container, and a fifth connecting pipe (242) located at the liquid outlet below the energy storage container. The fifth connecting pipe (242) is equipped with the electric valve (b); The fifth connecting pipe (242) is connected to the liquid outlet and the liquid inlet of the circulating pump group (23); The second connecting pipe (241) is equipped with the electric valve (b); The energy storage and capacity expansion container (25) is provided with a third connecting pipe (251) extending into the energy storage and capacity expansion container, the level gauge (d) and the temperature sensor (a) embedded in the energy storage and capacity expansion container, and a fourth connecting pipe (252) located at the liquid outlet above the energy storage and capacity expansion container. The fourth connecting pipe (252) is equipped with the electric valve (b), and the liquid outlet end of the fourth connecting pipe is connected to the lower part of the energy storage container (24); The parallel liquid outlet of the solar collector (22) and the second straight connecting pipe (27) are connected to the parallel liquid inlet of the first connecting pipe (231), the second connecting pipe (241), and the third connecting pipe (251); The energy storage container (24) and the energy storage capacity expansion container (25) respectively store working medium (e).

2. The switchable capacity-increasing energy storage solar-powered centralized water supply system for low-temperature areas according to claim 1, characterized in that, The water replenishment subsystem (1) also includes a municipal pipeline (11), a flow stabilizer (12), a water softener (13), a water tank (14), a silicon phosphate crystal processor (15), and a second bypass pipe (17). The municipal pipeline (11), the flow stabilizer (12), the water softener (13), and the water tank (14) are connected in sequence by pipelines; The electric valve (b) is provided at the connection between the municipal pipeline (11) and the flow stabilizer (12). A booster pump (131) is provided at the connection pipe between the flow stabilizer (12) and the water softener (13). A float valve (c) is provided at the outlet end of the connecting pipe between the water softener (13) and the water tank (14). The water tank (14) is provided with a first bypass pipe (144) outside, the water inlet of the first bypass pipe is connected to the water outlet of the municipal pipeline (11), and the water outlet of the first bypass pipe is connected to the water tank (14). The first bypass pipe (144) is equipped with an electric valve (b), and the water outlet end of the first bypass pipe is equipped with the float valve (c). The water tank (14) is equipped with a level gauge (d), and the water tank (14) is equipped with a laundry room variable frequency booster pump (141), a user variable frequency booster pump group (142), and a water replenishment pump (143) outside the water tank (14). The outlet of the water tank (14) is connected to the inlet of the parallel pipe of the laundry room variable frequency booster pump (141), the user variable frequency booster pump group (142), and the water replenishment pump (143). The water supply pump (143), the silicon phosphorus crystal processor (15), and the water supply pipe (16) are connected in sequence. The water inlet and outlet of the silicon phosphorus crystal processor (15) are connected to the second bypass pipe (17). An electric valve (b) is provided at the second bypass pipe (17).

3. The low-temperature region switchable capacity-increasing energy storage solar centralized water supply system according to claim 1 or 2, characterized in that, The working fluid (e) is an antifreeze solution consisting of a mixture of organic alcohols and water.

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