The Research of a New Nano Modified Phase Change Material

Abstract

Based on the characteristics of phase-change heat transfer, the heat transfer model of phase change heat storage material composed of fatty acid binary system is formulated, and the thermal property of the mixed system in the process of melting and solidification is validated by a number of experiments in this paper. With the help of DSC test, the phase inversion temperature, the variable enthalpy value and the heat storage performance of modified nano phase-change material are analyzed. The phase transition temperature of modified nano of binary transformation system is 24.09℃, the melting temperature 11.58℃ and the latent heat 213.20J/g. The addition of nano SiO2 has a significant effect on the latent heat of phase change in total transformation system, and the energy storage effect of the composite of PCM is improved significantly, at the same time, nano SiO2 plays a very good role in nucleating agent, phase change system is stable and the separation problem is solved completely. The diatomite adsorption PCM system has a moderate phase transition temperature, a large energy storage density, good stability, no leakage and high practical application value.