Preparation,heat Transfer Performance Research Of Gypsum Fatty Acid Phase Change Energy Storage Wallboards

Gypsum based phase change materials is a new type energy-saving building materialsthat have high heat storage. It can reduce air conditioning usage frequency through transfering heat in time and space to realize energy saving. In this paper,the technique of making phase change energy-storing gypsum board has been studied. The mechanics, heat transfer and the thermal control performance performance are also studied.It is a good phase change heat storage material through distribution of the fatty acids encapsulated by expanded perlite. DSC test shows that its phase change latent heat is 88.39J/g that consistent with the theoretical value. Its phase change temperature is within the scope of 25.7 and 34?. IR test results shows that composite phase change materials have good chemistry stabilityThe mechanical strength of the phase change energy-storing gypsum board will decline when increasing the dosage of the composite phase change materials. Through the use of admixtures such as citric acid,polypropylene fiber FDN water reducer etc., the mechanical strength of the phase change energy-storing gypsum board can reach the prescribed intensity index when the dosage is 30%. The best dosage are 0.01% citric acid, 0.4%-0.8% polypropylene fiber and 0.6% FDN water reducer. The heat transfer performance test results show that the phase change energy-storing gypsum board have lower heat transfer performance under the same external environment compared with the ordinary plasterboard. The inner surface temperature of the phase change energy-storing gypsum board and the device space temperature are lower than ordinary plasterboards. The building's heat storage could be increased when we use the phase change energy-storing gypsum board as building palisade structure. The temperature fluctuations in room will be reduced and the thermal comfort levels will be increased.The best preparation conditions of phase change energy-storing plasterboard are ordinary pressure and 45?.It meets the formula y=14.101x1.489 between plasterboard thickness and the impregnation time. x shows the plasterboard thickness, and y shows the shortest impregnation time. Phase change plasterboard has good stability when the adsorption capacity is less than 20%. DSC shows that thermal performance of phasechange materials is unaffected. After 250 times a second phase change cycle, quality loss of the gypsum based phase change materials is just for 2.5%.It is helpful to raise hot laziness of the mezzanine phase change plasterboard through improving the phase change interlayer thickness. The heat exchange speed has significantly improved after mixed with 10% expanded graphite. The thermal insulation of phase change laminated plasterboard is better than the phase change plasterboard made by direct incorporation method. The inner surface temperature of phase change laminated gypsum board reduce 2.5 ? compared with the phase change plasterboard made by direct incorporation method at the end of the heating, and the temperature of the device reduce 6 ?.