Prepared Of New-type Porous Phase Change Material And Study On Their Thermal And Moisture Performance

In the fields of construction energy-saving and environmental protecting material,the porous materials for its large specific surface area and especial porous structure,which were widely studied and used in the aspects of humidity controlling by manyscholars. Phase change materials can absorb or release a part of heat when the phasechange process occurring?using the heat produced form this process can adjust thetemperature of the surrounding environment, in which the heat transfer is spontaneous,does not consume any energy. Utilize a method of composite material that constitutedby the porous material and the phase change material to achieve the purpose ofhumidity and temperature controlling, it has a important practical significance forsaving energy, improving environment, promote the sustainable and development ofecological environment.This study selects sepiolite as the porous materials, activation of modified sepiolitefibers by using a hydrochloric acid, to make aperture of sepiolite increase, pore sizedistribution to be more uniform, enhance the adsorption performance. Simultaneously,using modified sepiolite as a base, choosing salt hydrate, paraffin wax and laurylalcohol as a phase change material and using a vacuum impregnation and orthogonaldesign methods to study a porous composite phase change materials under differentpressure, different impregnation time, different injection rate. The performance ofphase transition point and phase enthalpy point of sepiolite/Salt hydrate,sepiolite/paraffin and sepiolite/lauryl alcohol have been tested using differentialscanning calorimeter(DSC); The moisture adsorption and relegation ability ofcomposite porous phase change material have been experimented by the method of Saturated salt solution method; The morphology have been analysed using scanningelectron microscope?SEM?. The results show that the best adsorption capacity ofsepiolite for three materials is25.46%?61.66%and65.83%respectively, among themthe best comprehensive performance of phase change materials was sepiolite/paraffint.This composite material can be added as a “admixture” into the plaster to prepare agypsum based thermal storage composite materials. By determining a waterconsumption for the gypsum based thermal storage composite materials under differentdosage, test the flexural, compressive strength of different dosage, carrying out a hot,wet performance tests for six groups sample which prepared at different dosage andfinally choose a best mixed ratio.