CN118468761B - Method for calculating volume of energy storage tank body of compressed air energy storage system and application - Google Patents

Abstract

The invention belongs to the technical field of novel energy storage, and discloses a method for calculating the volume of an energy storage tank body of a compressed air energy storage system and application thereof. Acquiring working condition parameters of a compressed air energy storage system; determining mass flow flowing to the tank body in the transduction process of the compressed air energy storage system according to the working condition parameters; and determining the volume of the energy storage tank body according to the medium density, the mass flow and the circulation duration in the energy storage tank body. The invention provides a brand new and systematic calculation scheme. Not only enriches the theoretical system of the compressed air energy storage system, but also provides a new thought and direction for technical progress and industrial development in the field. The method for calculating the parameters of each node and the volume of the energy storage tank body in the compressed air energy storage system has remarkable beneficial effects, not only improves the calculation precision and efficiency, but also provides powerful support for the optimization design, energy efficiency improvement and stable operation of the energy storage system.

Description

A method for calculating the volume of energy storage tanks in a compressed air energy storage system and its application

Technical Field

The invention discloses a method for calculating the volume of an energy storage tank of a compressed air energy storage system and an application thereof, belonging to the technical field of novel energy storage.

Background Art

Compressed-Air Energy Storage (CAES) is an energy storage technology based on the development of gas turbines. The compressed air energy storage system is divided into two basic working processes: energy storage and energy release. Its working principle is that during the low load period of the power grid, the motor drives the compressor to compress the air sucked from the environment to a high-pressure state and store it in the air storage chamber. In this process, the electrical energy is converted into the internal energy of the compressed air and stored; during the peak load period of the power grid, the compressed air stored in the air storage chamber enters the expander to expand and generate electricity, and the internal energy and potential energy in the compressed air are converted back into electrical energy in this process.

Usually, the compressed air energy storage system makes full use of the waste heat in the system through the cold water tank and the hot water tank. That is, the water in the cold water tank flows through the energy storage side cooler to exchange the heat generated by the air compression in the compressor and store it in the hot water tank in the form of hot water; when releasing energy, the heat of the hot water in the hot water tank is exchanged through the energy release side heat exchanger to heat the air in the expander, and the cold water after the heat is exchanged flows back to the cold water tank to wait for the next cycle. This process makes full use of the waste heat in the system, saves energy consumption, reduces system costs, and improves the efficiency of the entire system.

With the rapid development of compressed air energy storage technology and the continuous expansion of its application scale, the need for accurate calculation of parameters at each node of the system has become increasingly prominent. At present, compressed air energy storage systems mainly rely on model software for parameter adjustment, but these software can usually only simulate the design parameters of some models and cannot reveal the specific calculation methods and calculation processes of each model within the system. This not only brings troubles to engineering design, but also makes it difficult to meet the requirements of system optimization. Among them, the accurate calculation of the volume of air storage tanks, cold water tanks and hot water tanks is particularly critical, and they are crucial to the overall design and optimization of compressed air energy storage systems.

Summary of the invention

The purpose of the present invention is to provide a method and application for calculating the volume of a compressed air energy storage system energy storage tank to solve the problem that the compressed air energy storage system in the prior art adjusts parameters through model software to simulate and obtain project design parameters. However, it is impossible to understand the calculation method of each tank inside the system, and then it is impossible to achieve a clear technical problem of the design goal. To achieve the above purpose, the present invention proposes a method and application for calculating the volume of a compressed air energy storage system energy storage tank, and the specific scheme is as follows:

In a first aspect, a method for calculating the volume of an energy storage tank of a compressed air energy storage system comprises:

Step 1: Obtain operating parameters of a compressed air energy storage system;

Step 2: determining the mass flow rate flowing to the tank during the energy conversion process of the compressed air energy storage system according to the operating condition parameters;

Step 3: Determine the volume of the energy storage tank according to the medium density in the energy storage tank, the mass flow rate and the cycle time.

Preferably, the energy storage tank is a gas storage tank, and step 2 specifically includes:

Determining the total power consumption of the multi-stage gas processing equipment in the compressed air energy storage system;

The air mass flow rate during the energy conversion process is determined according to the total shaft power of the multi-stage gas processing equipment and the total power consumption.

Preferably, determining the total power consumption of the multi-stage gas processing equipment in the compressed air energy storage system specifically includes:

Determine the power consumption of each stage of the gas processing equipment according to the equipment parameters of each stage of the gas processing equipment and the air inlet temperature in the compressed air energy storage system;

The total power consumption of the gas processing equipment at multiple stages is determined according to the power consumption of each stage of the gas processing equipment.

Preferably, the step 3 specifically includes:

Obtaining the initial density and final density of air in the gas storage tank during the energy conversion process;

The volume of the air storage tank is determined according to the air mass flow rate, the cycle time, the initial air density and the final air density.

Preferably, the energy storage tank is a heat storage tank, and step 2 specifically includes:

Determine the total medium mass flow rate of the medium in the compressed air energy storage system passing through the multi-stage heat exchange device.

Preferably, determining the total medium mass flow rate of the medium in the compressed air energy storage system passing through the multi-stage heat exchange device specifically includes:

Obtaining the heat exchange amount of each stage of the heat exchange device and the medium enthalpy value before and after the medium in the compressed air energy storage system passes through each stage of the heat exchange device;

The medium mass flow rate of each stage of the heat exchange device is determined according to the heat exchange amount and the medium enthalpy value, and the total medium mass flow rate of the multi-stage heat exchange device is determined.

Preferably, obtaining the heat exchange amount of each stage of the heat exchange device specifically includes:

Determining the air enthalpy value before and after the air in the compressed air energy storage system passes through each stage of the heat exchange device;

The heat exchange amount is determined according to the air enthalpy value and the air mass flow rate.

Preferably, the step 3 specifically includes:

The volume of the heat storage tank body is determined according to the density of the liquid medium in the heat storage tank body, the total medium mass flow rate and the circulation time.

In a second aspect, the present invention provides a computer device, comprising at least one processor and at least one memory;

The processor is communicatively connected to the memory;

The memory stores computer program instructions executable by the processor, and the processor invokes the computer program instructions to execute the method according to the first aspect.

In a third aspect, the present invention provides a computer-readable storage medium storing computer program instructions, wherein the computer program instructions execute the method described in the first aspect.

Beneficial effects: The present invention starts from the actual construction of the engineering project and derives the parameters of each node of the entire energy storage system in sequence. This method is not only close to engineering practice, but also can ensure the accuracy and reliability of the calculation results, and provides solid data support for the optimal design of the energy storage system. The calculation method proposed in the present invention has a wide range of applicability. Whether it is a gas storage tank body or a heat storage tank body, whether it is the mass flow rate of air or the mass flow rate of liquid, the present invention can provide an effective calculation method. This flexibility enables the present method to adapt to compressed air energy storage systems of different types and sizes, which provides great convenience for engineering practice.

In addition, the present invention also helps to improve the energy efficiency and stability of the compressed air energy storage system. By accurately calculating the parameters of each node, the operation process of the energy storage system can be more accurately controlled, energy loss can be reduced, and energy conversion efficiency can be improved. At the same time, accurate calculation of the volume of the energy storage tank helps to ensure the smooth operation of the system during the energy storage and release process, and improve the stability and reliability of the entire system.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a computing module in an embodiment of the present invention;

FIG2 is a flowchart of specific parameter calculations in an embodiment of the present invention;

FIG3 is a schematic diagram of the structure connection of a compressed air energy storage system according to an embodiment of the present invention;

FIG4 is a schematic diagram of the inlet and outlet temperatures and pressures of a compressor according to an embodiment of the present invention;

FIG5 is a schematic diagram of the inlet and outlet temperatures and pressures of the expander according to an embodiment of the present invention;

6 is a schematic diagram of the flow direction and mass flow of air and water in the interstage cooler according to an embodiment of the present invention;

7 is a schematic diagram of the flow direction and mass flow of air and water in the interstage heater in an embodiment of the present invention.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with specific implementation methods. It should be understood that the specific implementation methods described here are only used to explain the present invention and do not limit the scope of protection of the present invention.

Based on the system structure of the compressed air energy storage system, as shown in FIG3, the compressed air energy storage system in this embodiment includes multiple stages of gas processing equipment connected in sequence, a heat exchange device arranged between adjacent gas processing equipment for heat exchange, and a gas storage tank body connected to the gas processing equipment, and a heat storage tank body connected to the heat exchange device, and the heat storage tank body specifically includes a cold storage tank and a heat storage tank. The gas processing equipment is specifically a turbine, and the turbine specifically includes a compressor and an expander; the heat exchange devices are all countercurrent heat exchangers, specifically including a cooler and a heater.

The compressed air energy storage system includes an energy storage process and an energy release process, as shown in Figures 1 to 4. During the energy storage process, the compressed air energy storage system specifically includes multiple stages of compressors connected in sequence as gas processing equipment, and interstage coolers arranged between adjacent compressors as heat exchange devices. The inlet ends of the multiple interstage coolers are connected to the cold storage tank. As shown in Figure 6, the cold storage tank provides a low-temperature medium to the interstage cooler for storing the heat generated by the compressor when compressing the air in the medium, and the low-temperature medium is converted into a high-temperature medium and stored in the heat storage tank.

As shown in Figures 1 to 4, during the energy release process, the compressed air in the gas storage tank (i.e., the gas storage reservoir) passes through a multi-stage expander connected in sequence as a gas processing device and an interstage heater arranged between adjacent expanders as a heat exchange device. The internal energy of the compressed air is converted into kinetic energy and then into electrical energy through the expander. The inlet end of the multi-stage interstage heater is connected to the heat storage tank, which is used to provide high-temperature medium to the interstage heater and to provide heat when the compressed air expands. As shown in Figure 7, the high-temperature medium passing through each interstage heater is converted into a low-temperature medium and circulated and stored in the cold storage tank. The present invention does not limit the medium. Those skilled in the art can select water, steam, etc. as the heat exchange medium according to the actual project. In this embodiment, water is specifically selected as the medium.

During the compression and expansion process, most of the heat generated does not have time to be transferred to the surrounding environment. Therefore, in the present invention, the air compression and expansion process is simplified to an adiabatic process for calculation.

The present invention is based on the operating state of the compressed air energy storage system. First, various operating parameters of the energy storage system are determined according to the project scale, including the total shaft power of the multi-stage compressor. , Total shaft power of multi-stage expander , the isentropic efficiency of the compressor , isentropic efficiency of expander , and the number of hours of energy storage or release, i.e., the cycle time. It also includes the compression ratio or expansion ratio selected during the energy storage/release process according to the actual project.

This embodiment describes in detail the volume calculation of the energy storage tank of the present invention according to the energy storage stage and the energy release stage.

Energy storage stage:

According to the cold side end difference of the interstage cooler and the temperature of the cold storage tank, the temperature between 1 and 2 can be determined. The outlet temperature of the stage cooler is 2 to The suction temperature of the compressor.

The inlet/outlet pressure of each stage of the compressor is determined based on the pressure loss of the compressed air in the interstage cooler, the suction pressure of the first-stage compressor in a multi-stage compressor, the exhaust pressure of the last-stage compressor, and the number of compressor stages.

Specifically, the calculation method of the pressure loss of compressed air in the interstage cooler or interstage heater is as follows:

Where, ε is the energy efficiency of the heat exchanger; is the medium pressure at the fluid inlet (specifically, the medium pressure of water at the inlet of the heat exchange device in this embodiment).

Among them, the first stage compressor in the multi-stage compressor is used to suck the air from the environment into the first stage compressor for compression. Therefore, the inlet air temperature of the first stage compressor is is the ambient temperature; the first stage compressor inlet air pressure For environmental pressure.

The inlet air pressure of the next compressor is determined by the outlet air pressure of the previous compressor and the pressure loss of the interstage cooler, as shown in the following formula:

The outlet air pressure of the previous compressor is determined according to the actual project. Different compressor models have different output pressures.

After determining the inlet/outlet air pressures of the compressor at each level in the above steps, calculate the outlet air temperature of each compressor and the power consumption per unit mass of air of each compressor according to the inlet/outlet air pressures of the compressor at each level, the inlet air temperature of each level of the compressor, and the isentropic efficiency of the compressor. .

Among them, The inlet air temperature of the compressor is , the inlet air temperature of each compressor stage According to the above, the cold side end difference of the interstage cooler and the temperature of the cold storage tank are determined from 1 to The outlet temperature of the stage cooler is 1 to The outlet temperature of the stage cooler is equal to 2 to The suction temperature of the first compressor. This compression process is an adiabatic process, so The outlet air temperature of the compressor , the calculation formula is as follows:

In the formula, For the The compression ratio of the compressor stage; is the specific heat ratio of the compressor; is the adiabatic efficiency of the compressor (the present invention regards the compression process as an adiabatic process, therefore, the adiabatic efficiency of the compressor is equal to the isentropic efficiency of the compressor).

Power consumption per unit mass of air in each compressor Specifically, when a unit mass of air enters the compressor, The power consumption calculation formula of the compressor is as follows:

In the formula, is the gas constant of air.

According to the power consumption of each stage compressor, the total power consumption of the multi-stage compressor is determined. The calculation formula of the total power consumption is as follows:

In the formula, is the number of compressor stages.

According to the total shaft power of the multi-stage compressor The total power consumption of the multi-stage compressor determines the air mass flow rate in the compression stage , the calculation formula is as follows:

According to the outlet air temperature of each compressor The difference between the hot side of the interstage cooler and the outlet temperature of the cooling water at each stage of the cooler is determined.

Calculate the first Heat transfer of interstage cooler , the calculation formula is as follows:

In the formula, and For air in The air enthalpy value at the inlet/outlet of the second stage cooler is obtained by looking up the air enthalpy table based on the air temperature and pressure. The air temperature at the inlet of the first stage cooler is The outlet air temperature of the first compressor The air temperature at the outlet of the first stage cooler is The inlet air temperature of the first compressor; The air pressure at the inlet of the first stage cooler is The outlet air pressure of the first compressor The air pressure at the outlet of the first stage cooler is The inlet air pressure of the first stage compressor.

In the interstage cooler, the air passing through the compressor exchanges its heat with the cooling water in the interstage cooler.

Calculate the medium mass flow rate of cooling water in each branch according to the cooling water inlet/outlet temperature of the interstage cooler, the storage pressure of the cooling water and the heat exchange of each interstage cooler. :

In the formula, and For cooling water The medium enthalpy value at the inlet/outlet of the stage cooler. In this embodiment, the medium enthalpy value is obtained by querying the medium enthalpy value table based on the temperature and pressure of the medium.

The outlet mixed water temperature of the cooler (i.e., the temperature of the heat storage tank) is calculated based on the outlet cooling water temperature of each cooler, the medium mass flow rate of each branch cooling water, the total medium mass flow rate of the cooling water, and the hot side end difference of the interstage cooler. The water at the cooler outlet is mixed and enters the heat storage tank. During the expansion stage, this hot water enters the interstage heater to heat the air entering the expander. According to the hot side end difference of the heater during the expansion stage, the outlet temperature of the heat exchanger air can be calculated, i.e., the corresponding expander suction temperature.

Specifically, the total cooling water medium mass flow rate The calculation formula is as follows:

The mixed water enthalpy can be calculated based on the energy conservation equation of the mixed water at the outlet of each level of cooler. The energy conservation equation is:

In the formula, It is the medium enthalpy value after mixing cooling water at each level.

The temperature of the mixed water can be calculated from the medium enthalpy of the mixed water and the mixed water pressure (i.e. the storage pressure of the heat storage tank). The temperature of the mixed water is the medium temperature in the heat storage tank, and the medium in the heat storage tank is used to provide heat to the expander.

Energy release stage:

The inlet/outlet pressures of each stage of the expander are determined based on the number of expander stages, the suction pressure of the first-stage expander, the exhaust pressure of the last-stage expander, and the pressure loss of the expanded air in the interstage heater.

According to the inlet/outlet air pressure of each expander, the inlet air temperature of each expander and the isentropic efficiency of the expander, the exhaust air temperature of each expander and the unit mass output power of each expander are calculated. .

Among them, The inlet air temperature of the first stage expander is The inlet temperature of each stage of the expander is obtained through the above steps, specifically: the water at the cooler outlet is mixed and then enters the heat storage tank. In the expansion stage, this hot water enters the interstage heater to heat the air entering the expander. According to the hot side end difference of the heater in the expansion stage, the outlet temperature of the heater air can be calculated, that is, the corresponding expander suction temperature. This compression process is an adiabatic process, so the outlet temperature for:

In the formula, For the The expansion ratio of the first-stage expander, is the specific heat ratio of the expander; is the adiabatic efficiency of the expander (the present invention regards the expansion process as an adiabatic process, therefore, the adiabatic efficiency of the expander is equal to the isentropic efficiency of the expander).

Among them, the air in the energy release stage passes through the After the heater of the first stage, the temperature is The high-pressure air enters the expander, and the unit mass of air enters the The output power consumption of the expander is:

In the formula, is the gas constant of air.

According to the power consumption of each stage expander output, the total power consumption of the multi-stage expander is determined when a unit mass of air enters the multi-stage expander. The calculation formula is as follows:

In the formula, is the number of stages of the multi-stage expander.

According to the total shaft power of the multi-stage expander and the total power consumption of the multi-stage expander, calculate the air mass flow rate in the expansion stage , the calculation formula is as follows:

The outlet temperature of the water in the heater of the next stage is determined based on the outlet air temperature of each stage expander and the cold side end difference of the interstage heater.

Calculate the first stage according to the air inlet/outlet interstage heater temperature and the corresponding state pressure after the expander. Heat transfer capacity of interstage heater , the calculation formula is as follows:

In the formula, and For air in The air enthalpy value at the inlet/outlet of the stage heater. The air enthalpy value is obtained by looking up the air enthalpy value table based on the air temperature and pressure.

Calculate the medium mass flow rate of the interstage heating water of each branch according to the inlet/outlet temperature of the heating water of the interstage heater, the pressure of the circulating water and the heat exchange capacity of the interstage heaters. :

In the formula, and To heat water in The medium enthalpy value at the inlet/outlet of the stage heater. In this embodiment, the medium enthalpy value is obtained by the temperature and pressure of water, which can be obtained by looking up the water enthalpy value table.

The mixed water temperature at the outlet of the multi-stage heater (i.e., entering the cold storage tank) is calculated based on the outlet temperature of the heating water of each stage of the heater, the medium mass flow rate of the heating water in each branch, and the total heating water flow rate.

Among them, the total medium mass flow rate of heating water The calculation formula is as follows:

The mixed water enthalpy value can be calculated according to the energy conservation equation of the mixed water at the outlet of each level of heaters. The energy conservation equation is:

In the formula, It is the enthalpy of the medium after the heated water is mixed.

The temperature of the mixed water can be obtained from the medium enthalpy value and the mixed water pressure of the mixed water.

The initial air density of the gas storage tank and the final air density of the gas storage reservoir are determined according to the initial (minimum) inflation pressure of the gas storage tank, the final (maximum) inflation pressure, the initial temperature of the gas storage reservoir, and the final temperature of the gas storage reservoir during energy storage; air density It can be calculated using the gas state equation:

In the formula, is the gas compressibility factor; is the gas constant of air; is the air pressure; is the air temperature.

The design volume of the air storage tank is finally calculated based on the initial air density, final air density, air storage time and air mass flow rate of the compressor.

Among them, the calculation formula for the gas storage volume, that is, the design volume of the gas storage tank body, is:

In the formula, and are the initial and end times of the energy storage phase, is the cycle time, which is specifically the energy storage time in this embodiment; the density of the compressed air in the gas storage tank, that is, the initial air density and the final air density.

According to the storage pressure of the heat storage tank, the hot water temperature, the total mass flow rate of the cooling water and the duration of a cycle, the hot water density is determined, and finally the volume of the heat storage tank is calculated. The volume calculation formula of the heat storage tank is as follows:

In the formula, is the total medium mass flow rate of cooling water; is the cycle duration, which in this embodiment is specifically the energy storage duration; is the density of the mixed water after heat exchange.

According to the cold water tank storage pressure, cold water temperature and total medium mass flow of heating water, the length of a cycle, the cold water density is determined, and finally the cold tank volume is calculated. The volume calculation formula of the cold storage tank is as follows:

In the formula, is the total medium mass flow rate of heating water; is the cycle time, which is specifically the energy release time in this embodiment; is the density of water after cooling.

In actual projects, if there is no other water storage equipment such as heating, in order to maintain the mass balance of cooling water and heating water, when calculating the volume of the heat storage tank and the cold storage tank, the fluid mass is taken as the larger value of the total medium mass flow rate of cooling water and the total medium mass flow rate of heating water.

The present invention starts from the actual construction of the engineering project and derives the parameters of each node of the entire energy storage system in sequence. This method is not only close to engineering practice, but also can ensure the accuracy and reliability of the calculation results, and provides solid data support for the optimal design of the energy storage system. The calculation method proposed in the present invention has a wide range of applicability. Whether it is a gas storage tank body or a heat storage tank body, whether it is the mass flow rate of air or the mass flow rate of liquid, the present invention can provide an effective calculation method. This flexibility enables the present method to adapt to compressed air energy storage systems of different types and sizes, which provides great convenience for engineering practice.

In addition, the present invention also helps to improve the energy efficiency and stability of the compressed air energy storage system. By accurately calculating the parameters of each node, the operation process of the energy storage system can be more accurately controlled, energy loss can be reduced, and energy conversion efficiency can be improved. At the same time, accurate calculation of the volume of the energy storage tank helps to ensure the smooth operation of the system during the energy storage and release process, and improve the stability and reliability of the entire system.

An embodiment of the present invention also provides a computer device, including at least one processor and at least one memory; the processor is communicatively connected to the memory; the memory stores computer program instructions that can be executed by the processor, and the processor calls the computer program instructions to execute the method described in the above embodiment.

The embodiment of the present invention further provides a computer-readable storage medium, on which computer program instructions are stored, and the computer program instructions execute the method described in the above embodiment.

The above are only several embodiments of the present invention and are not intended to limit the present invention in any form. Although the present invention is disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, using the above disclosed technical content to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims (5)

1. The method for calculating the volume of the energy storage tank body of the compressed air energy storage system is characterized by comprising the following steps of:

step 1, acquiring working condition parameters of a compressed air energy storage system;

step 2, determining mass flow flowing to a tank body in the transduction process of the compressed air energy storage system according to the working condition parameters;

When the energy storage tank body is an air storage tank body, determining the total power consumption of the multi-stage gas treatment equipment in the compressed air energy storage system, and determining the air mass flow in the transduction process according to the ratio of the total shaft power of the multi-stage gas treatment equipment to the total power consumption;

when the energy storage tank body is a heat storage tank body, determining the total medium mass flow of the medium in the compressed air energy storage system passing through the multi-stage heat exchange device;

determining the total medium mass flow of the medium in the compressed air energy storage system through the multi-stage heat exchange device, wherein the method specifically comprises the following steps of:

acquiring heat exchange quantity of each stage of heat exchange device and medium enthalpy values before and after medium in the compressed air energy storage system passes through each stage of heat exchange device, determining medium mass flow of each stage of heat exchange device according to the heat exchange quantity and the medium enthalpy values, and determining total medium mass flow of the multi-stage heat exchange devices;

Step 3, determining the volume of the energy storage tank body according to the medium density in the energy storage tank body, the mass flow and the circulation duration;

When the energy storage tank body is an air storage tank body, acquiring the initial air density and the final air density in the air storage tank body in the transduction process, and determining the volume of the air storage tank body according to the ratio of the product of the air mass flow and the circulation time to the difference between the initial air density and the final air density;

when the energy storage tank body is a heat storage tank body, the volume of the heat storage tank body is determined according to the ratio of the product of the total medium mass flow and the circulation duration to the density of the liquid medium in the heat storage tank body.

2. The method of claim 1, wherein determining the total power consumption of the multi-stage gas processing device in the compressed air energy storage system comprises:

determining the power consumption of each stage of gas treatment equipment according to equipment parameters and air inlet temperature of each stage of gas treatment equipment in the compressed air energy storage system;

and determining the total power consumption of the multi-stage gas treatment equipment according to the power consumption of the gas treatment equipment of each stage.

3. The method for calculating the volume of the energy storage tank according to claim 1, wherein the step of obtaining the heat exchange amount of the heat exchange device of each stage comprises the following steps:

determining the enthalpy value of air before and after the air passes through each stage of heat exchange device in the compressed air energy storage system;

and determining the heat exchange amount according to the air enthalpy value and the air mass flow.

4. A computer device comprising at least one processor, at least one memory;

the processor is in communication with the memory;

The memory stores computer program instructions executable by the processor, the processor invoking the computer program instructions to perform the method of any of claims 1-3.

5.A computer readable storage medium, characterized in that it has stored thereon computer program instructions for performing the method according to any of claims 1-3.