Volume 24: Sustainable Energy Solutions for a Post-COVID Recovery towards a Better Future: Part VII

Effect of material characteristics on ice storage performance of an external melting ice-on-coil tube Jiaying Zheng , Chun Chang, Xiaoyu Xu, Jiangshuo Dong, Mingzhi Zhao, Shuguang Zhang

Abstract

The coil material has an effect on the icing performance. In this paper, the dynamic simulation of the icing process of three different coil materials is carried out. The variation of temperature field and liquid phase rate over time at the characteristic sections were analyzed. The results show that the ice layer first appears on the lower and outer side of the coil and gradually wraps all the outer wall of the coil.The thermal conductivity of ice coil material has an effect on the icing process. Especially when the thermal conductivity of coil material is lower than that of ice, the lower the thermal conductivity, the longer the time required for icing. But it change when the thermal conductivity of coil material is higher than that of ice, the improvement of thermal conductivity of coil material has little effect on the time required for icing. The thermal conductivity of reinforced polyvinyl chloride is only 2.3 W/(m·K) higher than that of polyvinyl chloride, but the time required for water outside the coil to completely freeze is reduced by 46%. The thermal conductivity of steel is 37.5 W/(m·K) higher than that of reinforced polyvinyl chloride, but the time required for water outside the coil to completely freeze is only reduced by 7%. In terms of the time required for icing, reinforced polyvinyl chloride is expected to replace steel. The natural convection of water has an effect on the icing outside the coil.

Keywords cold storage, ice-on-coil, thermal conductivity , liquid phase ratio, phase change