| With the proposal of the concept of"green building",assembly-type buildings have been booming,and rock wool has been well applied in prefabricated buildings because of its good thermal insulation.However,the simple rock wool panels as assembly-type building wall panels only use its low thermal conductivity,so as to play a thermal insulation effect,and can not achieve the use of energy storage,based on the concept of energy storage,this paper developed a room temperature phase change heat storage material,and adding the developed phase change heat storage material to the rock wool wall panel,constructing a new type of assembly-type building rock wool wall panels integrating energy storage+heat insulation.The study used calcium chloride hexahydrate-based phase change materials and silica aerogel as research materials,and designed and prepared a calcium chloride hexahydrate-based room temperature phase change material through orthogonal experiment and melt blending methods,the best orthogonal experimental ratios with the lowest degree of supercooling and suitable phase change temperature were screened out through the temperature rise and fall experimental tests on the calcium chloride hexahydrate-based phase change material.The effect of phase change material on the energy storage and thermal performance of rock wool panels was investigated by adding calcium chloride-based phase change material hexahydrate to rock wool panels using the surface brushing and infiltration method.On this basis,the composite thermal-function-adjustment rock wool panels with SiO2 aerogel/rock wool/calcium chloride hexahydrate-based phase change material were prepared by adding silica aerogel to the rock wool panels,the effect of aerogel on the energy storage and thermal insulation capacity and thermal performance of rock wool panels was further explored,and the following conclusions were drawn:（1）The optimal ratio of calcium chloride hexahydrate-based phase change materials with the lowest degree of supercooling and phase transition temperature suitable for human living environment was screened out in the results of orthogonal experiments.The optimum ratio is Ca Cl2-6H2O as the main phase change material,the doping amount of Mg Cl2-6H2O is10 wt.%,Sr Cl2-6H2O is 2 wt.%,and CMC is 1 wt.%.The degree of supercooling and phase transition temperature of the phase change materials under this ratio are 0.5°C and 24.9°C,respectively,and the latent heat of phase change is 133.44 J/g,with stable thermal storage performance and no phase separation.（2）The measurement results of the thermal-function-adjustment rock wool panel composited by rock wool and calcium chloride hexahydrate-based phase change material show that 30wt.%phase change material is the maximum adsorption capacity of rock wool board,and the specific heat capacity,thermal conductivity and compressive strength of the thermal-function-adjustment rock wool board increase with the increase of phase change material,although the thermal conductivity has increased,but the increase in specific heat capacity leads to a significant decrease in thermal diffusivity,among them,the growth ratio of specific heat capacity under the content of 10wt.%,20wt.%and 30wt.%phase change materials reached 292.1%,447.1%and 699.2%,respectively,it shows that the addition of phase change material gives the rock wool board high energy storage density.The test results of the self-made room show that the thermal-function-adjustment rock wool board can significantly reduce the fluctuation of indoor temperature and reduce the rate of heat transfer.（3）Compared to the thermal-function-adjustment rock wool board composited by rock wool and calcium chloride hexahydrate-based phase change material,the measurement results of the thermal-function-adjustment rock wool board composited by SiO2 aerogel、rock wool and calcium chloride hexahydrate-based phase change material show that the addition of aerogel will reduce the compressive strength、thermal conductivity and specific heat capacity,however,the heat insulation ability is significantly enhanced.The results of the self-made room and thermal performance tests of the thermal-function-adjustment rock wool board show that the rock wool board has the best energy storage and thermal insulation capacity under the joint action of 30wt.%calcium chloride hexahydrate-based phase change material and 3wt.%SiO2 aerogel,and the maximum reduction of indoor temperature under this ratio is6.4℃,and the reduction ratio is 21.19%;the specific heat capacity is 0.571 MJ/m3k,which is548.9%higher than that of pure rock wool board（0.088 MJ/m3k）;the thermal diffusivity is0.1324 mm2/s,which is 74.2%lower than that of pure rock wool board（0.5129 mm2/s）;the compressive strength is 0.0565 MPa,38.1%higher than that of pure rock wool board（0.0409MPa）. |
