Study on Thermal Storage Performance of Industrial Paraffin and Fatty Acid Binary Mixture

Taking the industrial paraffin and fatty acid binary mixture as the research object, the phase change temperature, latent heat of phase change and supercooling degree were studied by differential scanning calorimeter, aiming at reducing the application cost of simple fatty acid as phase change material, broadening the range of phase transition and increasing the amount of latent heat value of phase change. The results show that the paraffin-tannic acid and paraffin-lauric acid binary mixture reduces the phase transition temperature and increases the latent heat of phase change compared with the single fatty acid, which is suitable for the energy storage of the envelope structure. The phase transition temperature of paraffin-myristic acid, paraffin-stearic acid, paraffin-palmitic acid mixture is lower than 40 °C. Although it is lower than the phase transition temperature of single fatty acid under certain mixing ratio conditions, which is not suitable for application. In the energy storage of the structure, it can be used in other energy-saving systems such as phase change heat exchangers for waste heat recovery. Paraffin-tannic acid and paraffin-lauric acid binary mixtures are less subcooled and are ideal for energy storage in envelope structures.