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摘要
This paper presents a novel structure for a phase change heat storage system incorporating double spiral coils and expanding graphite to enhance heat transfer. A model of the double spiral coil phase change heat storage system is established to simulate the impact of coil pitch and thermal properties of materials on heat storage and release performance. The study delves into the influence of natural convection of phase change materials and the enhancement of material thermal conductivity on heat transfer in confined spaces. Results indicate that reducing the pitch and increasing the number of spiral coils within limited pitch conditions can enhance the heat release performance of the heat storage system. Incorporating expanded graphite boosts the thermal conductivity of phase change materials, albeit with an increase in material viscosity. Consequently, adding the expanded graphite improves the heat transfer and exchange efficiency of the heat storage system, albeit at the cost of suppressing natural convection heat transfer. Comparative analysis reveals that, under confined space conditions, the enhanced heat transfer resulting from material thermal conductivity enhancement compensates for the heat loss attributed to inadequate natural convection heat transfer. This study underscores that the key to controlling heat transfer enhancement in phase change heat storage systems lies in the thermal conductivity enhancement of materials. Drawing on experimental and simulation approaches, this article presents a designed heat storage system structure for heating domestic hot water. The proposed system exhibits excellent heat release performance across a broad range of inlet temperatures and flow rates. When combined with an electric heater, this heat storage system achieves a heating power exceeding 3500 W with electric power consumption below 2200 W, surpassing the power limitations of typical household electric heating equipment. ? 2023 The Author(s).
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