In view of the serious waste,the low utilization rate and the great limitation in time and space in the actual application process of industrial waste heat,efficient heat storage technology and devices are needed to solve such problems.This paper proposed a new phase change heat storage device combining multi-channel parallel flow flat tube with compact fins,which used water as the heat transfer fluid and lauric acid as the phase change material.The effects of injection method,flow rate and inlet temperature on the heat storage and release performance of the device were studied experimentally.Besides,the thermal performance of the device under small temperature difference was analyzed.The results show that the phase change material filling rate of the device is 82.5%,and the use of compact fins greatly strengthens the phase change materialʹs side heat transfer process,as well as its excellent heat storage and release performance.When the inlet temperature of the heat exchange fluid is 45 ℃/41 ℃ respectively,the phase change material completes the phase change at about 270 min/75 min.So the heat storage and heat release temperature difference can reach 2 ℃.The average heat storage specific power at the minimum temperature difference can reach 25.18 W/kg and the average heat extraction ratio power can reach 20.23 W/kg.
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