Abstract
In this study, a new cold storage phase change material eutectic hydrate salt (K2HPO4·3H2O–NaH2PO4·2H2O–Na2S2O3·5H2O) was prepared, modified, and tested. The modification was performed by adding a nucleating agent and thickener. The physical properties such as viscosity, surface tension, cold storage characteristics, supercooling, and the stability during freeze-thaw cycles were studied. Results show that the use of nucleating agents, such as sodium tetraborate, sodium fluoride, and nanoparticles, are effective. The solidification temperature and latent heat of these materials which was added with 0, 3, and 5 wt% thickeners were −11.9, −10.6, and −14.8°C and 127.2, 118.6, 82.56 J/g, respectively. Adding a nucleating agent can effectively improve the nucleation rate and nucleation stability. Furthermore, increasing viscosity has a positive impact on the solidification rate, supercooling, and the stability during freeze-thaw cycles.
Highlights
The development of cities is accompanied by huge energy consumption; people have gradually realized that the energy storage technology has very good ability to improve this situation, which can effectively improve the energy utilization ratio and reduce losses
Phase change material (PCM) is an effective latent heat thermal storage material. It has been widely used as a thermal functional material in thermal and cold energy storage fields, like solar energy storage [1], industrial waste heat utilization [2], building heating and air conditioning [3], thermal management of mobile devices [4], and so on
Pilar et al [23] used SrCO3 and Sr(OH)2 as nucleating agents for MgCl2·6H2O; the results show that the addition of 1 wt% SrCO3 and 0.5 wt% Sr(OH)2 almost fully suppress the supercooling and improve the performance of this PCM system
Summary
The development of cities is accompanied by huge energy consumption; people have gradually realized that the energy storage technology has very good ability to improve this situation, which can effectively improve the energy utilization ratio and reduce losses. Phase change material (PCM) is an effective latent heat thermal storage material It has been widely used as a thermal functional material in thermal and cold energy storage fields, like solar energy storage [1], industrial waste heat utilization [2], building heating and air conditioning [3], thermal management of mobile devices [4], and so on. All of these are aimed at realizing the conversion of energy beyond the restriction of time and space. The study of inorganic PCM has attracted much attention of researchers
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