| In this paper, the effective thermal conductivities of molten salt composites with different ratio were measured with the transient hot strip method at different temperatures. The temperature dependent effective thermal conductivities of molten salt composites were obtained. The thermal conductivity of Nitrate and carbonate are all low, and it gradually increases as the temperature rises, the comparison between the two salt, the thermal conductivity of carbonate was significantly higher than that of nitrate, and the former is affected by temperature is stronger than the latter. The effective thermal conductivities of molten salt composites filling with metal foam and foam graphite were predicted basd on model estimation. The effective thermal conductivity variation characteristic of molten salt composites with porosity of the filling and temperature is obtained. By using this strengthening method, the effective thermal conductivity of composite energy storage materials have been improved significantly, the heat capacity of heat storage device are improved effectively. The melting point, latent heat of fusion and specific heat capacity of the molten salt were measured with differential scanning calorimetry. The melting point, latent heat of fusion and specific heat capacity of the carbonate are all higher than those of the nitrate. Thermal properties of various molten salt composite were compared. The materials which is more suitable for phase change energy storage in solar thermal power generation is discussed, It has great significance to further improving the storage efficiency of the energy storage system and improving the stability of solar thermal power generation. |
