Multi-pool energy storage air conditioning system

Abstract

The utility model relates to a multi-pool energy storage air-conditioning system which comprises an air-conditioning system, two heat pump systems arranged in parallel and three pools, the air conditioning system is connected with the heat pump system and the secondary side of the heat exchanger; the heat pump system is connected with the water tank; the water tank is connected with the primary side of the heat exchanger; the system solves the problem that a single energy storage water pool cannot supply energy to an air conditioning system for 24 hours, and solves the problems that the energy storage water pool is too large in size and too high in initial investment due to too long air conditioning demand time, and the operation period of an air conditioning main unit of the system perfectly avoids electric power in peak periods. All loads in the peak period are transferred to the ordinary time period and the valley time period, peak load shifting of a power grid is facilitated, the operation cost of an air conditioning system is greatly reduced, and compared with a traditional 24-hour host direct supply system, the system can save about 20% of operation cost; the system is not only suitable for a 24-hour air conditioning system, but also can be used as a common energy storage air conditioning system for supplying energy in the daytime and storing energy at night.

Description

Technical Field

[0001] The present invention relates to an energy storage air-conditioning system, in particular to a multi-pool energy storage air-conditioning system. Background Art

[0002] The water energy storage air-conditioning system stores cooling capacity and heat using the sensible heat of water; the water energy storage air-conditioning system can achieve heat storage or cold storage; among them, water cold storage is mainly used for summer cooling; water heat storage is mainly used for winter heating; the energy storage air-conditioning system has the characteristics of saving the operation cost of the air-conditioning system, balancing the power grid load, and saving energy and protecting the environment.

[0003] The existing single energy storage pool cannot meet the problem of 24-hour energy supply, the volume of the energy storage pool is too large due to the too long air-conditioning demand time, the initial investment is too high, and the operation cost of the traditional 24-hour main engine direct supply system is relatively large, etc.;

[0004] In summary, how to store energy using the peak-valley electricity price difference and reduce the operation cost of the system has become an urgent problem to be solved by researchers in this field. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: how to store energy using the peak-valley electricity price difference and reduce the operation cost of the system;

[0006] To solve the above technical problem, the technical solution adopted by the present invention is:

[0007] The present invention is a multi-pool energy storage air-conditioning system, including: an air-conditioning system, two heat pump systems arranged in parallel, and three pools; the air-conditioning system is connected to the heat pump system and the secondary side of the heat exchanger; the heat pump system is connected to the pool; the pool is connected to the primary side of the heat exchanger.

[0008] To specifically illustrate how the air-conditioning system is connected to the heat exchanger, the present invention adopts that the water supply end of the air-conditioning system is connected to the secondary side of the heat exchanger through a first water inlet pipe; the water return end of the air-conditioning system is connected to the secondary side of the heat exchanger through a first water outlet pipe; a seventh valve is arranged on the first water inlet pipe, and an eighth valve is arranged on the first water outlet pipe.

[0009] How to connect the heat pump system with the air conditioning system. In the present invention, the heat pump system includes: a first heat pump system and a second heat pump system; the first heat pump water supply pipe of the first heat pump system is connected to the water supply end of the air conditioning system, and a first valve is provided thereon; the second heat pump water supply pipe of the second heat pump system is connected to the water supply end of the air conditioning system, and a third valve is provided thereon; the first heat pump water return pipe of the first heat pump system is connected to the water return end of the air conditioning system, and a second valve is provided thereon; the second heat pump water return pipe of the second heat pump system is connected to the water return end of the air conditioning system, and a fourth valve is provided thereon.

[0010] How to connect the heat pump system with the energy storage pool. In the present invention, a water distributor and a flow rectifying plate are provided in the pool; the pool includes a first pool, a second pool, and a third pool; a first reversing pipe and a second reversing pipe are arranged in parallel, which connect the water outlet, water inlet of the first pool, water outlet, water inlet of the second pool, and water outlet, water inlet of the third pool; first switching valves and second switching valves are provided on the first reversing pipe and the second reversing pipe; the first heat pump water supply pipe and the second heat pump water supply pipe are connected to a first main pipe; a second branch pipe, one end of which is connected to the first main pipe and the other end is connected to the first reversing pipe of the first pool, and a ninth valve is provided thereon; a third branch pipe, one end of which is connected to the first main pipe and the other end is connected to the first reversing pipe of the second pool, and a thirteenth valve is provided thereon; a fourth branch pipe, one end of which is connected to the first main pipe and the other end is connected to the first reversing pipe of the third pool, and a seventeenth valve is provided thereon; the first heat pump water return pipe and the second heat pump water return pipe are connected to a fifth main pipe; a sixth branch pipe, one end of which is connected to the fifth main pipe and the other end is connected to the second reversing pipe of the first pool, and a tenth valve is provided thereon; a seventh branch pipe, one end of which is connected to the fifth main pipe and the other end is connected to the second reversing pipe of the second pool, and a fourteenth valve is provided thereon; an eighth branch pipe, one end of which is connected to the fifth main pipe and the other end is connected to the second reversing pipe of the third pool, and an eighteenth valve is provided thereon.

[0011] How to connect the heat exchanger to the water tank. In the present invention, the primary side of the heat exchanger is connected to the first water inlet main pipe; the second water inlet branch pipe is connected to the first water inlet main pipe and the first reversing pipe of the first water tank, and an eleventh valve is arranged thereon; the third water inlet branch pipe is connected to the first water inlet main pipe and the first reversing pipe of the second water tank, and a fifteenth valve is arranged thereon; the fourth water inlet branch pipe is connected to the first water inlet main pipe and the first reversing pipe of the third water tank, and a nineteenth valve is arranged thereon; the primary side of the heat exchanger is connected to the first water return main pipe; the second water return branch pipe is connected to the first water return main pipe and the second reversing pipe of the first water tank, and a twelfth valve is arranged thereon; the third water return branch pipe is connected to the first water return main pipe and the second reversing pipe of the second water tank, and a sixteenth valve is arranged thereon; the fourth water return branch pipe is connected to the first water return main pipe and the second reversing pipe of the third water tank, and a twentieth valve is arranged thereon.

[0012] In order to provide the power for the medium flow, in the present invention, circulation pumps are arranged on the first water inlet main pipe, the first water outlet pipe, the first heat pump water return pipe, and the second heat pump water return pipe.

[0013] In order to be able to illustrate the load conditions of the first heat pump system and the second heat pump system, in the present invention, the load of the first heat pump system is 50% of the load of the second heat pump system.

[0014] The present solution also discloses an operation strategy for a multi-pool energy storage air conditioning system. In the energy storage mode, during peak electricity hours, the first pool provides cooling / heating, the first heat pump system and the second heat pump system are turned off. At this time, the seventh valve, the eighth valve, the eleventh valve, and the twelfth valve are opened, and the remaining valves are closed; in the energy storage mode, during flat electricity hours, the second pool provides cooling / heating, and the first pool stores cooling / heating. The first heat pump system is turned off and the second heat pump system is turned on. At this time, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the ninth valve, the tenth valve, the fifteenth valve, and the sixteenth valve are opened, and the remaining valves are closed; in the energy storage mode, during flat electricity hours, the third pool provides cooling / heating, and the second pool stores cooling / heating. The first heat pump system is turned off and the second heat pump system is turned on. At this time, the fifth valve, the sixth valve, the seventh valve, the eighth valve, the thirteenth valve, the fourteenth valve, the nineteenth valve, and the twentieth valve are opened, and the remaining valves are closed; in the energy storage mode, during flat or peak electricity hours, the first pool and the second pool provide cooling / heating, and the first heat pump system and the second heat pump system are turned off. At this time, the seventh valve, the eighth valve, the eleventh valve, the twelfth valve, the fifteenth valve, and the sixteenth valve are opened, and the remaining valves are closed; in the energy storage mode, during valley electricity hours, the first heat pump system provides cooling / heating, and the first pool, the second pool, and the third pool store cooling / heating. Both the first heat pump system and the second heat pump system are turned on. At this time, the first valve, the second valve, the fifth valve, the sixth valve, the ninth valve, the tenth valve, the thirteenth valve, the fourteenth valve, the seventeenth valve, and the eighteenth valve are opened; among them, the first switching valve is opened in summer and closed in winter; the second switching valve is opened in winter and closed in summer.

[0015] When a heat pump system is required to directly supply cooling and heating to the air conditioning system, when the heat pump system needs to work all the time, the first pool, the second pool, and the third pool are closed, the second heat pump system provides cooling / heating, and the first heat pump system is turned off. At this time, the third valve and the fourth valve are opened, and the remaining valves are closed.

[0016] Advantages of the present invention: The present invention is a multi-pool energy storage air conditioning system. This system solves the problem that a single energy storage pool cannot meet the 24-hour energy supply of the air conditioning system, and solves the problems such as the excessively large volume of the energy storage pool and the too high initial investment caused by the too long air conditioning demand time. Through the multi-mode cooperation of two heat pump systems and three pools, this system enables the operation period of the air conditioning host to perfectly avoid the peak-hour electricity, transfers all the peak-hour loads to the normal and off-peak hours, which is beneficial to the peak shaving and valley filling of the power grid, and greatly reduces the operation cost of the air conditioning system. Compared with the traditional 24-hour direct supply system of the host, through the multi-mode cooperation of two heat pump systems and three pools, it realizes 24-hour cooling or heating of the air conditioning system, and this system can save about 20% of the operation cost; this system is not only applicable to the 24-hour air conditioning system, but also can be used as an ordinary energy storage air conditioning system that supplies energy during the day and stores energy at night. Brief Description of the Drawings

[0017] The present invention will be further described below with reference to the drawings and embodiments.

[0018] Figure 1 is the system diagram of the present utility model;

[0019] Figure 2 is the upper part system diagram of this system;

[0020] Figure 3 is the right side system diagram of the lower part of this system;

[0021] Figure 4 is the left side system diagram of the lower part of this system;

[0022] Figure 5 is the operation mode switching table. Detailed Embodiment

[0023] The present invention will now be further described in detail with reference to the drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0024] As Figures 1-3 shown, the present invention is a multi-pool energy storage air conditioning system, including: an air conditioning system 1, two heat pump systems 2 arranged in parallel, and three pools 3; the air conditioning system 1 is connected to the heat pump system 2 and the secondary side of the heat exchanger 4; the heat pump system 2 is connected to the pool 3; the pool 3 is connected to the primary side of the heat exchanger 4.

[0025] To specifically illustrate how the air-conditioning system is connected to the heat exchanger, in the present invention, the water supply end of the air-conditioning system 1 is connected to the secondary side of the heat exchanger 4 through the first water inlet pipe 11; the water return end of the air-conditioning system 1 is connected to the secondary side of the heat exchanger 4 through the first water outlet pipe 12; a seventh valve P7 is provided on the first water inlet pipe 11, and an eighth valve P8 is provided on the first water outlet pipe 12.

[0026] As Figures 1-3 shown, regarding how to connect the heat pump system to the air-conditioning system, in the present invention, the heat pump system 2 includes: a first heat pump system 21 and a second heat pump system 22; the first heat pump water supply pipe 211 of the first heat pump system 21 is connected to the water supply end of the air-conditioning system 1, and a first valve P1 is provided thereon; the second heat pump water supply pipe 221 of the second heat pump system 22 is connected to the water supply end of the air-conditioning system 1, and a third valve P3 is provided thereon; the first heat pump water return pipe 212 of the first heat pump system 21 is connected to the water return end of the air-conditioning system 1, and a second valve P2 is provided thereon; the second heat pump water return pipe 222 of the second heat pump system 22 is connected to the water return end of the air-conditioning system 1, and a fourth valve P4 is provided thereon.

[0027] As Figures 1-3As shown in the figure, regarding how to connect the heat pump system to the water return pool, in the present invention, a water distributor and a rectifying plate are provided in the pool 3; the pool includes a first pool 31, a second pool 32, and a third pool 33; a first reversing pipe 35 and a second reversing pipe 36 arranged in parallel, which connect the water outlet, water inlet of the first pool 31, the water outlet, water inlet of the second pool 32, and the water outlet, water inlet of the third pool 33; a first switching valve Z1 and a second switching valve Z2 are provided on both the first reversing pipe 35 and the second reversing pipe 36; the first heat pump water supply pipe 211 and the second heat pump water supply pipe 221 are connected to a first main pipe 23; a second branch pipe 24, one end of which is connected to the first main pipe 23, and the other end is connected to the first reversing pipe 35 of the first pool 31, and a ninth valve P9 is provided thereon; a third branch pipe 25, one end of which is connected to the first main pipe 23, and the other end is connected to the first reversing pipe 35 of the second pool 32, and a thirteenth valve P13 is provided thereon; a fourth branch pipe 26, one end of which is connected to the first main pipe 23, and the other end is connected to the first reversing pipe 35 of the third pool 33, and a seventeenth valve P17 is provided thereon; the first heat pump water return pipe 212 and the second heat pump water return pipe 222 are connected to a fifth main pipe 51; a sixth branch pipe 52, one end of which is connected to the fifth main pipe 51, and the other end is connected to the second reversing pipe 36 of the first pool 31, and a tenth valve P10 is provided thereon; a seventh branch pipe 53, one end of which is connected to the fifth main pipe 51, and the other end is connected to the second reversing pipe 36 of the second pool 32, and a fourteenth valve P14 is provided thereon; an eighth branch pipe 54, one end of which is connected to the fifth main pipe 51, and the other end is connected to the second reversing pipe 36 of the third pool 33, and an eighteenth valve P18 is provided thereon.

[0028] As Figures 1-3As shown in the figure, regarding how to connect the heat exchanger to the water pool, in the present invention, the primary side of the heat exchanger 4 is connected to the first water inlet main pipe 41; a second water inlet branch pipe 42, which connects the first water inlet main pipe 41 and the first reversing pipe 35 of the first water pool, and an eleventh valve P11 is provided thereon; a third water inlet branch pipe 43, which connects the first water inlet main pipe 41 and the first reversing pipe 35 of the second water pool 32, and a fifteenth valve P15 is provided thereon; a fourth water inlet branch pipe 44, which connects the first water inlet main pipe 41 and the first reversing pipe 35 of the third water pool 33, and a nineteenth valve P19 is provided thereon; the primary side of the heat exchanger 4 is connected to the first water return main pipe 45; a second water return branch pipe 46, which connects the first water return main pipe 45 and the second reversing pipe 36 of the first water pool 31, and a twelfth valve P12 is provided thereon; a third water return branch pipe 47, which connects the first water return main pipe 45 and the second reversing pipe 36 of the second water pool 32, and a sixteenth valve P16 is provided thereon; a fourth water return branch pipe 48, which connects the first water return main pipe 45 and the second reversing pipe 36 of the third water pool 33, and a twentieth valve P20 is provided thereon.

[0029] As Figures 1-3 shown in the figure, in order to provide the driving force for the medium flow, in the present invention, circulation pumps 6 are provided on the first water inlet main pipe 41, the first water outlet pipe 12, the first heat pump water return pipe 212, and the second heat pump water return pipe 222.

[0030] As Figures 1-3 shown in the figure, in order to be able to illustrate the load conditions of the first heat pump system and the second heat pump system, in the present invention, the load of the first heat pump system 21 is 50% of the load of the second heat pump system 22.

[0031] As Figures 1-4 shown in the figure, the present solution also discloses an operation strategy of a multi - water - pool energy - storage air - conditioning system. In the energy - storage mode, during the peak - electricity period from 8 o'clock to 11 o'clock, the first water pool 31 provides cooling / heating, and the first heat pump system 21 and the second heat pump system 22 are turned off. At this time, the seventh valve P7, the eighth valve P8, the eleventh valve P11, and the twelfth valve P12 are opened, and the rest of the valves are closed;

[0032] In this state, the two heat pump systems are turned off, and the first water pool 31 alone supplies cooling and heating to the air - conditioning system 1 through the heat exchanger 4. The effective volumes of the first water pool 31, the second water pool 32, and the third water pool 33 are designed to provide 3 - hour full - load energy supply. The energy source of the first water pool 31 relies on valley - electricity, and the first water pool 31 is energy - stored through the heat pump system during valley - electricity.

[0033] In the energy storage mode, during the flat electricity period from 11:00 to 14:00, the second water tank 32 supplies cooling / heating, the first water tank 31 stores cooling / heating, the first heat pump system 21 is turned off, and the second heat pump system 22 is turned on. At this time, the fifth valve P5, the sixth valve P6, the seventh valve P7, the eighth valve P8, the ninth valve P9, the tenth valve P10, the fifteenth valve P15, and the sixteenth valve P16 are opened, and the rest of the valves are closed;

[0034] In this state, the second water tank 32 alone supplies cooling / heating to the air conditioning system 1 through the heat exchanger 4. At this time, the second heat pump system 22 operates to store energy in the first water tank 31;

[0035] In the energy storage mode, during the flat electricity period from 14:00 to 17:00, the third water tank 33 supplies cooling / heating, the second water tank 32 stores cooling / heating, the first heat pump system 21 is turned off, and the second heat pump system 22 is turned on. At this time, the fifth valve P5, the sixth valve P6, the seventh valve P7, the eighth valve P8, the thirteenth valve P13, the fourteenth valve P14, the nineteenth valve P19, and the twentieth valve P20 are opened, and the rest of the valves are closed;

[0036] In this state, the third water tank 33 alone supplies cooling / heating to the air conditioning system 1 through the heat exchanger 4. At this time, the second heat pump system 22 operates to store energy in the second water tank 32;

[0037] In the energy storage mode, during the peak electricity period from 17:00 to 22:00 and the flat peak electricity period from 22:00 to 0:00, the first water tank 31 and the second water tank 32 supply cooling / heating, and the first heat pump system 21 and the second heat pump system 22 are turned off. At this time, the seventh valve P7, the eighth valve P8, the eleventh valve P11, the twelfth valve P12, the fifteenth valve P15, and the sixteenth valve P16 are opened, and the rest of the valves are closed;

[0038] After storing energy in the first water tank and the second water tank during the flat electricity period from 11:00 to 14:00 and the flat electricity period from 14:00 to 17:00, heat exchange is performed on the air conditioning system.

[0039] In the energy storage mode, during the valley electricity period from 0:00 to 8:00, the first heat pump system 21 supplies cooling / heating, and the first water tank 31, the second water tank 32, and the third water tank 33 store cooling / heating. Both the first heat pump system 21 and the second heat pump system 22 are turned on. At this time, the first valve P1, the second valve P2, the fifth valve P5, the sixth valve P6, the ninth valve P9, the tenth valve P10, the thirteenth valve P13, the fourteenth valve P14, the seventeenth valve P17, and the eighteenth valve P18 are opened;

[0040] The first heat pump system 21 is directly connected to the air conditioning system 1 for energy supply, and the second heat pump system stores cooling / heating in the first water tank 31, the second water tank 32, and the third water tank 33 for use by the air conditioning system 1 the next day.

[0041] Among them, the first switching valve Z1 is opened in summer and closed in winter; the second switching valve Z2 is opened in winter and closed in summer;

[0042] Either the first switching valve or the second switching valve is opened to adjust the water tank to be in the cold storage or heat storage mode.

[0043] As Figures 1-4 shown, when the heat pump system is required to directly supply heat and cold to the air conditioning system, when the heat pump system needs to work all the time, the first water tank 31, the second water tank 32, and the third water tank 33 are closed, the second heat pump system 22 supplies heat / cold, and the first heat pump system 21 is closed. At this time, the third valve P3 and the fourth valve P4 are opened, and the rest of the valves are closed;

[0044] In this state, when the water tank fails, the second heat pump system 22 independently supplies energy to the air conditioning system 1.

[0045] In other words, the system is provided with three water tanks 3 of the same size, and the effective volume of each water tank 3 is designed to provide 3 hours of full-load energy supply; two heat pump systems are provided, the first heat pump system 21 is selected according to 50% load, and the second heat pump system 22 is selected according to normal load;

[0046] Operation strategy:

[0047] The system is generally divided into two operation modes, one is the working mode of the energy storage system running normally; the other is the direct supply mode of the air conditioning main unit when the energy storage system stops due to reasons.

[0048] Operation strategy of the energy storage mode:

[0049] From 8:00 to 11:00, at the peak time electricity price, the first water tank 31 supplies energy, and the stored energy can meet 3 hours of normal operation;

[0050] From 11:00 to 14:00, at the normal time electricity price, the second water tank 32 supplies energy, and the second heat pump system 22 is turned on to store energy for the first water tank 31 whose energy has been consumed. The first water tank can be filled during this time period;

[0051] From 14:00 to 17:00, at the normal time electricity price, the third water tank 33 supplies energy, and the second heat pump system 22 stores energy for the second water tank 32 whose energy has been consumed;

[0052] From 17:00 to 22:00, at the peak time electricity price, from 22:00 to 0:00, at the normal time electricity price. During these two time periods, the first water tank 31 and the second water tank 32 supply energy together. Since the night load demand decreases, the energy stored in the second water tank 32 and the first water tank 31 can meet the use of the air conditioner during this time period;

[0053] 0:00 - 8:00, off-peak electricity price. The second heat pump system 22 stores energy for the first, second, and third water tanks. The first heat pump system 21 supplies energy to the air conditioning system 1. Since the nighttime load demand decreases, the first heat pump system 21 can meet the use of the air conditioner during this period.

[0054] Direct supply mode of the air conditioning main unit:

[0055] The second heat pump system 22 independently supplies energy to the air conditioning system 1.

[0056] Inspired by the ideal embodiments of the present invention described above, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A multi-tank energy storage air conditioning system, characterized in that: include: One air conditioning system, two parallel heat pump systems, and three water tanks; The air conditioning system is connected to the heat pump system and the secondary side of the heat exchanger; The heat pump system is connected to the water pool; The water tank is connected to the primary side of the heat exchanger; The water supply end of the air conditioning system is connected to the secondary side of the heat exchanger through a first water inlet pipe; The return water end of the air conditioning system is connected to the secondary side of the heat exchanger through a first water outlet pipe; A seventh valve is provided on the first water inlet pipe, and an eighth valve is provided on the first water outlet pipe; The heat pump system comprises: a first heat pump system and a second heat pump system; The first heat pump water supply pipe of the first heat pump system is connected to the water supply end of the air conditioning system, and a first valve is arranged on the first heat pump water supply pipe; The second heat pump water supply pipe of the second heat pump system is connected to the water supply end of the air conditioning system, and a third valve is arranged on the second heat pump water supply pipe; The first heat pump water return pipe of the first heat pump system is connected to the water return end of the air conditioning system, and a second valve is arranged on the first heat pump water return pipe; The second heat pump water return pipe of the second heat pump system is connected to the water return end of the air conditioning system, and a fourth valve is arranged on the second heat pump water return pipe.

2. A multi-tank energy storage air conditioning system according to claim 1, characterized in that: The water pools are all provided with water distributors and rectifying plates; the water pools include a first water pool, a second water pool, and a third water pool; A first reversing pipe and a second reversing pipe are arranged in parallel, and connect the water outlet and water inlet of the first water pool with the water outlet and water inlet of the second water pool and the water outlet and water inlet of the third water pool; The first reversing tube and the second reversing tube are both provided with a first switching valve and a second switching valve; The first heat pump water supply pipe and the second heat pump water supply pipe are connected to a first main pipe; A second branch pipe, one end of which is connected to the first main pipe, and the other end of which is connected to the first reversing pipe of the first water tank, and a ninth valve is arranged on the second branch pipe; A third branch pipe, one end of which is connected to the first main pipe, and the other end of which is connected to the first reversing pipe of the second water tank, and a thirteenth valve is arranged on the third branch pipe; a fourth branch pipe, one end of which is connected to the first main pipe, and the other end of which is connected to the first reversing pipe of the third water tank, and a seventeenth valve is arranged on the fourth branch pipe; The first heat pump return pipe and the second heat pump return pipe are connected to a fifth main pipe; a sixth branch pipe, one end of which is connected to the fifth main pipe, and the other end of which is connected to the second reversing pipe of the first water tank, and a tenth valve is arranged on the sixth branch pipe; a seventh branch pipe, one end of which is connected to the fifth main pipe, and the other end of which is connected to the second reversing pipe of the second water tank, and a fourteenth valve is arranged on the seventh branch pipe; An eighth branch pipe has one end connected to the fifth main pipe and the other end connected to the second reversing pipe of the third water tank, and an eighteenth valve is arranged on the eighth branch pipe.

3. A multi-tank energy storage air conditioning system according to claim 2, characterized in that: The primary side of the heat exchanger is connected to a first water inlet main pipe; a second water inlet branch pipe connected to the first water inlet main pipe and the first reversing pipe of the first water tank, and having an eleventh valve disposed thereon; A third water inlet branch pipe, which is connected to the first water inlet main pipe and the first reversing pipe of the second water tank, and is provided with a fifteenth valve; a fourth water inlet branch pipe connected to the first water inlet main pipe and the first reversing pipe of the third water tank, and provided with a nineteenth valve; The primary side of the heat exchanger is connected to the first water return main pipe; A second water return branch pipe, which is connected to the first water return main pipe and the second reversing pipe of the first water tank, and is provided with a twelfth valve; a third water return branch pipe, which is connected to the first water return main pipe and the second reversing pipe of the second water tank, and is provided with a sixteenth valve; The fourth water return branch pipe is connected to the first water return main pipe and the second reversing pipe of the third water tank, and is provided with a twentieth valve.

4. A multi-tank energy storage air conditioning system according to claim 3, characterized in that: The first water inlet main pipe, the first water outlet pipe, the first heat pump return pipe and the second heat pump return pipe are all provided with circulating water pumps.

5. A multi-tank energy storage air conditioning system according to claim 4, characterized in that: The load of the first heat pump system is 50% of the load of the second heat pump system.

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