Ice slurry has been widely used for thermal energy storage system due to its high cold energy storage capacity. To effectively improve the efficiency of ice slurry generator, it is essential to have a deeper understanding about the solidification mechanism on the plate surface of ice generator, which is affected by many factors, such as the roughness of surface and the apparent contact angle. This work studies the impacts of roughness and inhibitor concentration on the freezing temperature, subcooling and the heterogeneous nucleation energy at the surface of aluminum, copper and Teflon plates. Results show that both the roughness and the inhibitor concentration can clearly affect the freezing temperature of water droplet and the heterogeneous nucleation energy. In general, the freezing temperature rises and the subcooling and the heterogeneous nucleation energy drop as the surface roughness increases for all studied materials; and the heterogeneous nucleation energy also increases with the increase of inhibitor concentration. Since the heterogeneous nucleation energy is mainly determined by the substance and the roughness, while not by the surface material, it is important to increase the roughness in order to reduce subcooling and save energy, especially for copper and aluminum.

冰浆由于其高的冷能存储能力而已被广泛地用于热能存储系统。为了有效提高制冰机的效率，必须对制冰机板表面的凝固机理有更深入的了解，而制冰机受表面粗糙度和表观接触角等诸多因素的影响。这项工作研究了粗糙度和抑制剂浓度对铝，铜和聚四氟乙烯板表面的凝固温度，过冷和异质成核能的影响。结果表明，粗糙度和抑制剂浓度均可明显影响水滴的凝固温度和非均相成核能。一般来说，随着所研究材料表面粗糙度的增加，冷冻温度升高，过冷和异相形核能下降；异相成核能也随着抑制剂浓度的增加而增加。由于异质形核能主要由物质和粗糙度决定，而不是由表面材料决定，因此增加粗糙度以减少过冷并节省能源非常重要，特别是对于铜和铝。