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Preparation and characterization of phase change energy storage gypsum

The thermophysical properties of binary phase change materials with different 
 ratios of capric acid and palmitic acid were studied by step cooling curve 
 method and differential scanning calorimetry in this paper. Furthermore, the 
 best adsorption materials and coating materials were selected by testing 
 their mass adsorption rate and mass loss rate. Finally, the specific heat 
 capacity, thermal conductivity coefficient and compressive strength of phase 
 change energy storage gypsum (PCESG) was determined respectively, and the 
 energy-saving effect of the PCESG in the wall is evaluated. The results show 
 that the binary phase change materials can form a eutectic system. When the 
 mass ratio of capric acid to palmitic acid is 7:3, the low eutectic point of 
 the binary system is formed, and the crystallization temperature of system 
 is 26°C. The adsorption capacity of expanded perlite is much larger than 
 that of ceramsite, and the mass loss rate of the material coated by styrene 
 acrylic emulsion is lower than that of EVA. The specific heat capacity of 
 PCESG is about twice that of ordinary gypsum. With the addition of phase 
 change materials, the thermal conductivity coefficient of PCESG decreases 
 gradually, and the compressive strength of PCESG decreases gradually at the 
 same time. Compared with ordinary gypsum, PCESG has better energy-saving 
 performance.