A water power supply system based on gravity energy storage

Abstract

The application discloses a water and electricity supply system based on gravity energy storage, which comprises a gravity energy storage and water storage linkage system, a control module, a direct-current low-energy coupling air conditioner, coupling pipelines, the linkage system comprises an energy storage water tank, a lifting control support and a small gravity wheel machine, and the air conditioner comprises an air conditioner host, an alternating current load, a direct current load and a waste heat recovery device. The application has the advantages of high energy storage conversion efficiency, high speed, simple structure, innovative complementation of water storage and energy storage, overall planning of water supply routes, conversion of cold and heat source potential difference into electric energy for supply to different functional areas of buildings, solution of building energy storage demand, peak shaving and valley filling, realization of energy saving and emission reduction of hospitals, secondary utilization of air conditioner return water, water saving of the circulating water air conditioner, improvement of air conditioner operation water quality, reduction of pipeline maintenance cost and economy. The application can be combined with various energy saving modes such as solar energy to provide implementation space for more energy saving technologies.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building energy supply, in particular to a water and electricity supply system based on gravity energy storage. BACKGROUND

[0002] With the acceleration of the process of urban modernization, the research on new energy storage methods at home and abroad is in-depth, and the gravity energy storage technology represented by pumped storage is developing rapidly, which is environmentally friendly, fast, efficient and stable. In large buildings, the gravity energy storage technology is used to store the energy required for building by increasing the potential energy, which breaks through the limitations of the application scene of gravity energy storage and has strong research value. At the same time, under the requirement of energy saving and emission reduction, gravity energy storage not only saves additional resource consumption through energy conversion during the falling process of heavy objects, but also can deal with the problem of emergency power and water shortage, and ensure the normal energy gain and overall operation of large buildings.

[0003] At present, some high-energy-consumption buildings often face the sudden situation of building emergency power and water shortage, which causes some uncontrollable influence, high energy consumption and no emergency protection capability. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art, provide a water and electricity supply system based on gravity energy storage, and realize energy coordination and complementation based on building water supply and drainage and heating ventilation air conditioning system. The energy saving of electricity and water for daily operation of high energy consumption buildings is realized, and the sudden situation of building emergency power and water shortage is solved, and the normal and orderly function reaches the emergency protection capability.

[0005] The purpose of the present application is realized by the following technical scheme:

[0006] A water and electricity supply system based on gravity energy storage, comprising a gravity energy storage and water storage linkage system, a low-energy coupling heating ventilation air conditioning system, a coupling pipeline and a control module, the gravity energy storage and water storage linkage system comprises an energy storage water tank, a lifting control support and a small gravity wheel machine; the energy storage water tank is arranged at the bottom layer of the lifting control support when it is empty, and is used for receiving tap water flow supplied by tap municipal supply, and is lifted to the top layer for storage after the energy storage water tank is full; the lifting control support comprises a speed control device and a power generation device, and is used for converting gravity potential energy into mechanical energy; the small gravity wheel machine is mounted at the end of the gravity energy storage and water storage linkage system, and is used for converting unstable mechanical energy converted from gravity potential energy into stable electric energy output;

[0007] The low-energy coupled heating, ventilation and air conditioning system comprises an original heating, ventilation and air conditioning system air conditioner host, a water supply and return pipe and a waste heat recovery device; on the basis of the original heating, ventilation and air conditioning system, a gravity energy storage water storage linkage system is connected to the low-energy coupled heating, ventilation and air conditioning system through a coupling pipe, and the water resource of the energy storage water tank is part of the circulating structure of the air conditioner host; in the heating season, the bottom energy storage water tank is supplemented with municipal water flow, and the hot water stored in the top energy storage water tank in the cooling season is released, and the energy storage water tank is controlled by the lifting control support and the small gravity wheel to be used for life and production after descending; in the cooling season and the transition season, the bottom energy storage water tank receives the municipal water flow again, and after the water flow is heated by heat exchange with the refrigerant in the air conditioner host, the water flow is connected to the energy storage water tank again and rises to the top as hot water storage;

[0008] The coupling pipe is used for ensuring the coordinated operation of the gravity energy storage system, and comprises a water supply pipe, an energy storage water tank inlet and outlet pipe and a water supply and return pipe of the low-energy coupled heating, ventilation and air conditioning system, which are coupled and connected on the basis of the original water supply and drainage pipe;

[0009] The control module is used for controlling the operation state of the water and electricity supply system according to the actual electricity and water working conditions of the building: when in the daytime normal energy consumption period, the function of peak shaving and valley filling is played, the rich energy is reserved under the condition of normal electricity and water supply of the building, and the gravity energy storage water linkage system is controlled in the operation mode; when in the night low energy consumption period, the energy is stored by using the high and low difference of the cold and heat sources, and the gravity energy storage water linkage system is controlled in the energy storage mode; when the emergency situation of water stop or power failure occurs, the reserved water in the energy storage water tank is released, the gravity potential energy of the water is converted into electric energy, and the reserved water in the energy storage water tank is transported to the target building to meet the demand of life and production, and the gravity energy storage water linkage system is controlled in the emergency operation mode.

[0010] Further, the control module comprises the following control modes:

[0011] When in the daytime normal energy consumption period, the function of peak shaving and valley filling is played, and the gravity energy storage water linkage system is controlled in the operation mode;

[0012] When in the night low energy consumption period, the gravity energy storage water linkage system is controlled in the energy storage mode;

[0013] When in the heating season, the gravity energy storage water linkage system is controlled in the hot water supply mode;

[0014] When in the cooling season or the transition season, the gravity energy storage water linkage system is controlled in the air conditioning waste heat absorption mode;

[0015] When the emergency situation of water stop or power failure occurs, the gravity energy storage water linkage system is controlled in the emergency operation mode.

[0016] Further, in the daytime operation mode, during the peak period of water and electricity use, several energy storage water tanks are sequentially linked to drop, controlled by small gravity wheel machines, to stably and continuously output water and electricity, so that the building's daytime water and electricity use is maintained near the average value, achieving the effect of peak shaving and valley filling; during the low peak period of electricity and water use, after the energy storage water tank is filled with water, it is lifted to the top layer by the lifting control support, and water and electricity are stored; during the cooling season and the transition season, after heat exchange occurs in the air conditioning host, the tap water flow is warmed up, and then the energy storage water tank is connected again to rise to the top layer as hot water storage; during the heating season, the hot water storage in the energy storage water tank can ensure emergency supply under the condition of needing hot water; in the case of power shortage, by coordinating several groups of energy storage water tanks, a part of the energy storage water tanks are dropped for gravity potential power generation to ensure emergency electricity, and the remaining energy storage water tanks are connected to the original water supply and drainage pipeline of the building through the coupling pipeline to ensure emergency water supply.

[0017] Further, the gravity energy storage and water storage linkage system can simultaneously lift and lower several energy storage water tanks; the pre-arranged gravity energy storage and water storage linkage system stores water resources as stored energy, and the stored water is stored in the energy storage water tank located on the top floor of the building; when there is a power generation demand, the lifting control support drives the dropped energy storage water tank to transfer the gravity potential of the water, which is converted into stable electric energy to meet the building's electricity demand; at the same time, the small gravity wheel machine moves to control the working speed, so as to realize the stable supply of electric energy; during the process, the stored water flowing out of the dropped energy storage water tank can be supplied according to the demand of each room and department of the building.

[0018] Further, the volume and number of energy storage water tanks are set based on the electricity and water use behavior of the target building; the insulation performance of the energy storage water tank and the linkage mode of the lifting control support and the small gravity wheel machine are determined based on the building type, the climate zone, the energy demand, the energy consumption mode, and the behavior influencing factors of the target building.

[0019] Compared with the prior art, the technical scheme of the present application has the following advantages:

[0020] 1. The water and electricity supply system of the present application can supply electricity and water resources to the building when there is a power shortage, realize the coupling and complementation of stored water and stored energy resources, and achieve the energy complementation of stored water and stored electricity by combining the building water supply and drainage system with the heating, ventilation and air conditioning system, thereby solving the building's energy storage demand.

[0021] 2. The present application combines the layout of the building water supply and drainage system and the heating, ventilation and air conditioning system, and overall plans the coupling pipeline of the stored water supply, and converts the potential energy of the stored water into electric energy to supply different functional areas of the building, realizing the cross-fusion of multiple disciplines, and constructing a system design with stronger flexibility, stronger practicality and wider coverage.

[0022] 3.The water and electricity supply framework of the gravity energy storage system is high in energy storage efficiency and fast in speed, and is designed on the basis of respecting user's energy and water behaviors more, following the power system peak regulation characteristics more, and guaranteeing the building emergency water supply and drainage demand.

[0023] 4.In the central heating and cooling area, the cold and heat source height difference is utilized, the building electricity and water behaviors are combined, the cold and heat source high and low differences are utilized for energy storage, the power shortage condition is realized, power generation is supplied in time to guarantee normal life and production, and the reserved water can be put into use. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a gravity energy storage and water storage linkage system and low-energy coupled heating and ventilation air conditioning system linkage control schematic diagram of the water and electricity supply system of the present application. DETAILED DESCRIPTION

[0025] The application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and do not limit the application.

[0026] In the embodiment of the application, a water and electricity supply framework design method applied to a water and electricity supply system of a building is provided, the water and electricity supply system comprising a gravity energy storage and water storage linkage system, a low-energy coupled heating and ventilation air conditioning system, a coupled pipeline, and a control module; the gravity energy storage and water storage linkage system comprises an energy storage water tank, a lifting control support, and a small gravity wheel machine; the main part of the gravity energy storage and water storage linkage system is the energy storage water tank, the energy storage water tank is carried on the bottom layer of the lifting control support when the tank is empty, is used for receiving tap water flow supplied by a tap municipal supply, and is lifted to the top layer for storage after being filled with water; the lifting control support comprises a speed control device and a power generation device, and is used for converting gravity potential energy into mechanical energy; the small gravity wheel machine is carried at the end of the gravity energy storage and water storage linkage system, and is used for converting unstable mechanical energy converted from gravity potential energy into stable electric energy output; the volume and quantity of the energy storage water tank are set based on the main electricity and water behaviors of the target building; the specific arrangement positions of the energy storage water tank, the lifting control support, and the small gravity wheel machine are determined based on the building type, the climate zone, the energy demand, the energy consumption mode, and the behavior influencing factors of the target building and other related backgrounds.

[0027] The low-energy coupled heating ventilation air conditioning system comprises an air conditioning host, a water supply and return pipe and a waste heat recovery device of an original heating ventilation air conditioning system of a building; on the basis of the original heating ventilation air conditioning system of the building, a high-efficiency gravity potential energy storage technology is introduced to intelligently control cold and hot water resources; the gravity energy storage water storage linkage system is connected with the low-energy coupled heating ventilation air conditioning system through a coupling pipeline; the water resources of the energy storage water tank can be used as a part of a circulating structure of the air conditioning host; in a heating season, the bottom energy storage water tank is supplemented with municipal water flow to release hot water in the top energy storage water tank stored in a cooling season; the energy storage water tank is controlled by a lifting control support and a small gravity turbine to be used for life and production after descending; in the cooling season and the transition season, the bottom energy storage water tank receives municipal water flow again, which is heated after heat exchange with refrigerant in the air conditioning host and then is connected to the energy storage water tank to rise to the top as hot water storage, which can guarantee hot water supply for some hot water supply scenes; in this process, the waste heat recovery device is used to fully utilize air conditioning waste heat resources, so that the effect of summer refrigeration, waste heat absorption and winter heating is achieved.

[0028] The coupling pipeline is used to connect the gravity energy storage water storage linkage system and the low-energy coupled heating ventilation air conditioning system through the municipal water pipeline, the energy storage water tank inlet and outlet pipeline and the water supply and return pipeline of the low-energy coupled heating ventilation air conditioning system on the basis of the original water supply and drainage pipeline of the building, so as to ensure the coordinated operation of the gravity energy storage system.

[0029] The control module is used to control the system operation state according to actual different power and water conditions of the building: when in a normal energy consumption period of the day, the control module plays a role of peak shaving and valley filling to ensure normal power and water supply of the building and reserve energy, and controls the gravity energy storage water storage linkage system in the operation mode; when in a low energy consumption period of the night, the control module controls the gravity energy storage water storage linkage system in the energy storage mode by using more cold and heat source height difference energy storage; when an emergency situation of water stop or power stop occurs, the control module releases the reserved water in the energy storage water tank, converts the gravity potential energy of the water into electric energy, and supplies the reserved water from the water tank to the target building according to the requirements of each room department for life and production, and controls the gravity energy storage water storage linkage system to convert into an emergency operation mode.

[0030] Specifically, the control method of the control module is as follows:

[0031] When in a normal energy consumption period of the day, the control module plays a role of peak shaving and valley filling to control the gravity energy storage water storage linkage system in the operation mode.

[0032] When in a low energy consumption period of the night, the control module controls the gravity energy storage water storage linkage system in the energy storage mode.

[0033] When in a heating season, the control module controls the gravity energy storage water storage linkage system in a hot water supply mode.

[0034] When in the cooling season or the transition season, control the gravity energy storage water linkage system in the absorption air conditioning waste heat mode;

[0035] When the emergency situation of water stop or power failure occurs, control the gravity energy storage water linkage system in the emergency operation mode.

[0036] In the embodiment of the application, during the peak period of water and electricity consumption in the daytime operation mode, most of the energy storage water tanks are sequentially linked and lowered, and the stable and continuous output of water and electricity is controlled through a small gravity turbine, so that the water and electricity consumption of the building during the day is maintained around the average value, achieving the effect of peak shaving and valley filling; during the low peak period of electricity and water consumption at night, the energy storage water tank is filled with water and lifted to the top layer by the lifting control support after the energy storage water tank is filled with water, and water and electricity are stored; during the cooling season and the transition season, the tap water flow is warmed after heat exchange in the air conditioning host, and then reconnected to the energy storage water tank to the top layer as hot water reserve; during the heating season, the hot water reserve in the energy storage water tank can ensure emergency supply in the case of hot water demand at night; in the case of power shortage such as sudden power failure at any time, a part of the energy storage water tank can be lowered to generate electricity by using its gravitational potential energy, and the remaining energy storage water tank can be connected to the original water supply and drainage pipeline of the building through the coupling pipeline to ensure emergency water supply.

[0037] Specifically, the embodiment comprehensively investigates the building electricity consumption and water consumption, establishes a target building geometric model, and constructs a gravity energy storage water linkage system, a low-energy coupling heating and air conditioning system, a coupling pipeline, and a control module of the water and electricity supply system based on gravity energy storage. The overall layout of the water and electricity supply system is preset, the parameters are determined, the equipment is selected, and finally a complete water and electricity supply system is established. The specific process is as follows:

[0038] Investigate the background of the target building. The target building is a hospital complex building. The first to third floors are outpatient and emergency departments, the fourth floor is a medical technology department, the fifth to fifteenth floors are inpatient departments, and the building area is 2.4*10 4 m 2 , located in the subtropical monsoon climate zone, with 100,000 outpatient visits and 8,000 inpatients per year; due to the particularity of the hospital, the water quality is required, the total average water consumption is 28.89t, and the comprehensive evaluation obtains the total power of building air conditioning energy consumption 1680KW-2300KW.

[0039] The hospital model is drawn by using Sketch Up and other software. The linkage mode of the lifting control support and the small gravity turbine is determined based on the building type, the climate zone, the energy demand, the energy consumption mode, and the behavior influencing factors. The volume and quantity of the energy storage water tank are set based on the building electricity consumption and water consumption behavior;

[0040] Considering the building construction features and different room use requirements, the gravity energy storage water storage linkage system stores the excess water in the energy storage water tank on the roof when the hospital is in the low electricity and water consumption period.

[0041] Reference Figure 1 The water network system is coupled to the original building water supply and drainage pipeline, and the water and electricity supply system is connected to realize intelligent control of the energy storage system on the water and electricity supply. In the energy storage mode, the excess water is stored in the energy storage water tank on the roof to realize water storage and energy storage. When it is in the daytime, it is in the normal operation mode, and the peak shaving and valley filling effect is played to ensure that the basic water and electricity supply can control and continue to use the water and electricity supply system to store excess resources and realize building energy saving and emission reduction requirements. When there is an emergency situation of water stop or power failure, it immediately switches to emergency operation mode, coordinates multiple energy storage water tanks, and uses the gravity potential energy of some of the energy storage water tanks to generate electricity to ensure emergency power supply. The remaining energy storage water tanks are connected to the original building water supply and drainage pipeline through the coupling pipeline to ensure emergency water supply.

[0042] A complete water and electricity supply framework of the water and electricity supply system applied to the hospital building is established, and 60 sets of water and electricity supply systems are expected to be set. The gravity energy storage water storage linkage system can simultaneously realize lifting and lowering multiple energy storage water tanks; the gravity energy storage water storage linkage system arranged in advance stores water resources as stored energy, and the stored water is stored in the energy storage water tank on the top floor of the building; when there is a power generation demand, the lifting and lowering control bracket drives the descending energy storage water tank to transfer the gravity potential energy of the water, which is converted into stable electric energy to meet the building electricity demand; the energy storage water tank descends while the small gravity wheel machine moves, which can control the working speed to realize stable supply of electric energy; the stored water flowing out of the descending energy storage water tank can be supplied according to the requirements of each room and department of the building.

[0043] For such a large building as a hospital, most of the original building water supply and low-energy coupled heating, ventilation and air conditioning system pipelines are arranged underground, and the energy storage water tanks of the water and electricity supply system are arranged on the roof. The stored water resources for emergency water supply in the hospital have two uses after being transported to the hospital building: as ordinary domestic water for toilets and wash basins in the hospital building and as pure water or softened water for special rooms such as operating rooms, hemodialysis, central supply, and oral surgery department in the hospital. Special requirements such as reverse osmosis + nuclear grade mixed bed process should be used to process the gravity potential energy-free water resources transported to the hospital building before they are used as corresponding special water supply. At the same time, the stored water released by the water and electricity supply system can also be used as water supply to the air conditioner main machine of the low-energy coupled heating, ventilation and air conditioning system after being softened, and the supply of cold and hot water can be realized by combining with renewable energy sources such as solar energy, realizing the comprehensive utilization and regulation of water sources, gravity potential energy, and renewable energy sources such as solar energy. Multiple utilization methods of stored water help the hospital building to realize resource conservation and emission reduction requirements.

[0044] Specifically, the reserve water in the energy storage water tank can be used as living water in emergency, the high and low level difference energy storage of cold and heat sources is utilized, the water resource without gravity potential energy transported to the building in the power shortage condition and the power supply process is purified in time, so that the water quality meets the ''Drinking Water Health Standards GB5749-2022'' and other special demand standards, and the water resource is prevented from being polluted in the pipeline transportation process and affecting human health.

[0045] The water and electricity supply results of the complete hospital building water and electricity supply system are calculated, and are compared with the actual target building overall energy consumption values: 2760KW obtained by multiplying the target building demand power 2300KW by the expansion coefficient 1.2 is taken as the demand target quantity, 60 sets of water and electricity supply systems are operated, the total water storage capacity of the system reaches 25-30t, the energy storage power range is 1728-2592KW at the power peak, and theoretically, the energy consumption needs of the hospital air conditioner daily power consumption are met, and the basic water and electricity demand for one day can be met in the emergency condition of water and electricity stop.

[0046] The present application is not limited to the above-described embodiments. The above description of specific embodiments is intended to describe and illustrate the technical solutions of the present application, and the specific embodiments described above are merely illustrative and not restrictive. Without departing from the purpose of the present application and the scope protected by the claims, those skilled in the art can make many forms of specific changes under the inspiration of the present application, which all belong to the protection scope of the present application.

Claims

1. A gravity-based energy storage water power supply system, characterized in that, The utility model relates to a gravity energy storage water storage linkage system, a low-energy coupled heating ventilation air conditioning system, a coupling pipeline and a control module, the gravity energy storage water storage linkage system comprises an energy storage water tank, a lifting control support and a small gravity wheel machine, the energy storage water tank is arranged at the bottom layer of the lifting control support when being empty, receives tap water flow supplied by the municipal government, and is lifted to the top layer for storage after being filled with water, the lifting control support comprises a speed control device and a power generation device, and is used for converting the gravity potential energy into mechanical energy, the small gravity wheel machine is arranged at the end of the gravity energy storage water storage linkage system, and is used for converting unstable mechanical energy converted from the gravity potential energy into stable electric energy output, the low-energy coupled heating ventilation air conditioning system comprises an original heating ventilation air conditioning system air conditioner host, a water supply and return pipeline and a waste heat recovery device, on the basis of the original heating ventilation air conditioning system, the gravity energy storage water storage linkage system is connected with the low-energy coupled heating ventilation air conditioning system through the coupling pipeline, and the water resource of the energy storage water tank is used as part of the circulating structure of the air conditioner host, the bottom layer energy storage water tank is supplemented with municipal tap water flow in the heating season, releases the hot water in the top layer energy storage water tank stored in the cooling season, and the energy storage water tank is controlled to descend by the lifting control support and the small gravity wheel machine during the hot water releasing process and is used for life and production, the bottom layer energy storage water tank receives tap water flow supplied by the municipal government again in the cooling season and the transition season, the tap water flow is heated after heat exchange with refrigerant in the air conditioner host, and then is input into the energy storage water tank and lifted to the top layer to be used as hot water storage; the coupling pipeline is used for ensuring the coordinated operation of each link of the gravity energy storage system, and is coupled and connected with the tap water pipeline of the gravity energy storage water storage linkage system, the water inlet and outlet pipelines of the energy storage water tank and the water supply and return pipelines of the low-energy coupled heating ventilation air conditioning system on the basis of the original building water supply and drainage pipeline, the control module is used for controlling the operation state of the water and electricity supply system according to the actual electricity and water working conditions of the building, plays the role of peak shaving and valley filling in the normal energy consumption period of the day, ensures the normal supply of building electricity and water, reserves abundant energy under the condition of normal supply of building electricity and water, controls the gravity energy storage water storage linkage system in the operation mode, stores energy in the low energy consumption period of the night, controls the gravity energy storage water storage linkage system in the energy storage mode, releases the stored water in the energy storage water tank in the emergency situation of water stop or power failure, converts the gravity potential energy of the stored water into electric energy, and the stored water is transported from the energy storage water tank to the target building and can be supplied to life and production according to the requirements of each room department, and controls the gravity energy storage water storage linkage system to be converted into the emergency operation mode.

2. A gravity-based water energy storage system according to claim 1, wherein, The control module comprises the following control modes: the gravity energy storage water storage linkage system is controlled in the operation mode in the normal energy consumption period of the day, the gravity energy storage water storage linkage system is controlled in the energy storage mode in the low energy consumption period of the night, the gravity energy storage water storage linkage system is controlled in the hot water supply mode in the heating season, the gravity energy storage water storage linkage system is controlled in the air conditioner waste heat absorption mode in the cooling season or the transition season, the gravity energy storage water storage linkage system is controlled in the emergency operation mode in the emergency situation of water stop or power failure.

3. A gravity-based water power storage system according to claim 1, wherein, During the peak period of water and electricity consumption in the daytime operation mode, several energy storage water tanks are sequentially linked to drop, controlled by small gravity wheel machines, to stably and continuously output water and electricity, so that the building's daytime water and electricity consumption is maintained near the average value, achieving the effect of peak shaving and valley filling; during the low peak period of electricity and water consumption, the energy storage water tanks are filled with water and lifted to the top layer by the lifting control bracket after being filled, for water and electricity storage; during the cooling season and transition season, the tap water flow is warmed after heat exchange in the air conditioner host, and then reconnected to the energy storage water tank to the top layer as hot water reserve; during the heating season, the hot water reserve in the energy storage water tank can ensure emergency supply under the condition of hot water demand; in the case of power shortage, by coordinating several groups of energy storage water tanks, a part of the energy storage water tanks are dropped for gravity potential power generation to ensure emergency electricity, and the remaining energy storage water tanks are connected to the original building water supply and drainage pipeline through the coupling pipeline to ensure emergency water supply.

4. The water power supply system based on gravity stored energy according to claim 1, wherein, The gravity energy storage water storage linkage system can simultaneously lift and lower several energy storage water tanks; the pre-arranged gravity energy storage water storage linkage system reserves water resources as stored energy, and the reserved water is stored in the energy storage water tank located on the top floor of the building; when there is a power generation demand, the lifting control bracket drives the dropped energy storage water tank to transfer the gravity potential energy of the water, which is converted into stable electric energy to meet the building's electricity demand; the small gravity wheel machine moves while the energy storage water tank is descending, controlling the working speed to achieve stable supply of electric energy; the reserved water flowing out of the dropped energy storage water tank can be supplied according to the demand of each room and department of the building.

5. A gravity-based water power storage system according to claim 1, wherein, Based on the electricity and water consumption behavior of the target building, the volume and number of energy storage water tanks are set; based on the building type, climate zone, energy demand, energy consumption mode, and behavior influencing factors of the target building, the insulation performance of the energy storage water tank and the linkage mode of the lifting control bracket and small gravity wheel machine are determined.

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