[21] obtained a PCM with a phase transition temperature of 20~25 °C, which was achieved by adding 0.5% hydroxyethyl cellulose, 5% SrCl2·6H2O, and 35% MgCl2·6H2O into a solution of CaCl2·6H2O. The change in the phase transition temperature of CaCl2·6H2O was due to the formation ...