Experimental Study on Gas-Paraffin Direct Contact Phase Change Storage Heat Transfer

Hegang Zhu ； Xiaoni Qi ； Xiaohang Qu ； Chunhu Miao

《International Core Journal of Engineering》 9卷4期 (2023/04) Pp. 219-230

https://doi.org/10.6919/ICJE.202304_9(4).0030

摘要

Through temperature measurement and visualization experiments, the heat transfer characteristics and condensation phenomena in the heat transfer process were studied and analyzed by using gas as heat transfer fluid and gas directly entering the direct contact phase change energy storage device through the nozzle. Thermocouples at different positions in the accumulator can measure the internal temperature change of PCM. The results show that the condensation time of heated PCM decreases with the increase of the flow rate of injected gas, and the maximum reduction of condensation time in the experiment is 24.36 %. The larger the nozzle, the lower the condensation time, but most cases are below 1 % ; the volume of paraffin in the phase transition increases with the increase of gas flow rate, and the volume increases by 275 % at the gas flow rate of 1.7 L / min. The heat transfer power was obtained by numerical calculation. With the increase of gas flow rate, the heat transfer power increased by 31.99 %. The development of direct contact phase change storage system achieves higher energy storage efficiency, higher heat release rate and simpler structure than traditional phase change storage system.

關鍵字

Heat Transfer Fluid ； Phase Change Energy Storage ； Direct Contact ； Heat Transfer Process ； Visual Experiment

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