Inorganic hydrated salt phase change material and preparation method thereof

Abstract

The invention relates to the field of a phase change material, in particular to an inorganic hydrated salt phase change material and a preparation method thereof. The inorganic hydrated salt phase change material is prepared from the following components by weight percent: 65 to 75 percent of heat storage agent, 8.5 to 10 percent of xanthan gum, 4.5 to 15 percent of heat conducting material, 4.5 to 8 percent of modifier and 2 to 10 percent of nucleating agent. The inorganic hydrated salt phase change material has the advantages that the cold phenomenon can be completely eliminated, the energystorage density is high, the phase change volume is small, the inorganic hydrated salt phase change material is nontoxic, non-volatile, stable in performance, good in repeatability and convenient in use; the service life of the phase change material is effectively prolonged; and the phase change temperature of the phase change material is 10 to 30 DEG C, the heat conducting performance is good, the phase change reversibility is good, the phase changetransition is fast, and the heat storage performance is good.

Description

technical field [0001] The invention relates to the field of phase change materials, in particular to an inorganic hydrated salt phase change energy storage material and a preparation method thereof. Background technique [0002] The competition in the 21st century is the competition of energy. As the largest developing country in the world, my country is facing enormous pressure from population, resources and environment. The development of energy has played an important role in reducing poverty, increasing employment opportunities and improving the quality of life. [0003] As a new type of energy-saving and energy-storage material, inorganic hydrated salt phase-change energy storage materials use their latent heat to store and release energy to solve the problem of energy spatio-temporal mismatch, achieve energy recycling and improve energy utilization. Inorganic hydrated salt phase-change energy storage materials absorb heat at high temperatures, store excess external h...

AI Technical Summary

Problems solved by technology

To solve the supercooling problem of inorganic hydrated salt phase change energy storage materials, the main method is to add nucleating agents. According to the "nucleating agent screening theory with 15% difference in lattice parameters", the commonly used nucleating agents are: Na 2 B 4 o 7 10H 2 O, SrCl 2 ·6H 2 O, CO (NH 2 ) 2 、BaCO 3 , Sr(OH) 2 ·8H 2 O, Na 2 HPO 4 12H 2 O, Na 2 SiO 3 9H 2 O, etc. Most of the above nucleating agents exist in the form of crystalline hydrated salts, and they also have unstable factors such as supercooling. Long-term recycling still cannot completely solve the supercooling problem of inorganic phase change materials.

The supercooling phenomenon leads to a decrease in the phase change transformation speed of the phase change material and a decrease in heat storage performance, which shortens the service life of the inorganic hydrated salt phase change material and limits the application range of the phase change material