International Scientific Journal


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 was determined, respectively, and the energy-saving effect of the phase change energy storage gypsum 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 ethylene vinyl acetate. The specific heat capacity of phase change energy storage gypsum is about twice that of ordinary gypsum. With the addition of phase change materials, the thermal conductivity coefficient of phase change energy storage gypsum decreases gradually, and the compressive strength of phase change energy storage gypsum decreases gradually at the same time. Compared with ordinary gypsum, phase change energy storage gypsum has better energy-saving performance.
PAPER REVISED: 2020-07-08
PAPER ACCEPTED: 2020-07-12
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THERMAL SCIENCE YEAR 2021, VOLUME 25, ISSUE Issue 6, PAGES [4737 - 4748]
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