Study of shrinkage of heat storage materials for building envelope structures

The article presents the results of thermophysical properties developed by the authors of heat storage materials for building envelope structures. Based on the results obtained, the materials obtained by mixing individual n-alkanes are distinguished by stable thermo-physical characteristics. Results of shrinkage of the developed heat storage materials depending on the temperature during crystallization and expansion during melting. Several shrinkage peaks and two heat release peaks were determined during crystallization and phase transition, which explains that the shrinkage coefficient curves and heat release graphs do not coincide. This is due to the complexity of the chemical composition of commodity paraffin, which contains other groups of hydrocarbons along with n-alkanes. The dependence of shrinkage of heat storage materials on temperature is obtained and their shrinkage coefficients from temperature are analyzed. Developed heat storage materials with a melting point of 25⁰C provide energy savings by increasing the heat capacity of building envelope structures and can be used in the design of energy-efficient buildings.