Design of phase-change heat and energy storage system based on CPCM hexagonal and simulation of heat storage and release
The phase-change heat storage and energy storage system was designed,and the regular hexagonal brick and composite phase change materials(CPCM)were innovatively adopted.The characteristics of the heat storage and release process of the phase-change heat storage and energy storage system were numerically simulated by ANSYS Fluent,and the heat storage and release process was studied.The influence of the shape,material and heating power of the phase-change thermal storage brick on the heat storage process of the designed phase-change thermal storage system,as well as the influence of CPCM thermal storage temperature,air inlet flow rate and air inlet temperature on the heat release process were investigated.The simulation results showed that under the heating power of each heating rod of 0.7kW,the charging time required for the heat storage process was about 7.7h,and the average temperature of the heat storage body could reach 870℃.The simulation results met the design requirements.The regular hexagonal brick showed better heating uniformity,the heat accumulator with CPCM had better heat storage performance,and the increase of heating power could greatly accelerate the heat storage process.In the heat release process,1m/s air inlet flow rate was more appropriate,and the required discharge time was 14.6h.The faster the air inlet flow rate,the lower the temperature and the lower the CPCM heat storage temperature,the higher the heat release rate of the system.The total heat storage and release time of the system was about 22.3h,which could realize the utilization of peak and valley electricity well.
energy storage systemregular hexagonal brickcomposite phase change materialsheat storage and releasenumerical simulation
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