Preparation And Properties Of Attapulgite Matrix Composite Phase Change Materials

Attapulgite based composite phase-change energy storage material,as a green and environment-friendly heat storage material,has broad application prospects in the field of improving heat energy utilization.The adsorption performance of porous materials can be improved by modification.In this paper,the numerical simulation data can be obtained by creating appropriate composite phase change material model and discrete algebraic equation of its physical field,and solved by program,which can be used to explore the prediction and exploration of the performance of composite phase change materials.The adsorption properties of attapulgite were improved by acid and thermal activation modification;Then,the activated attapulgite is compounded with paraffin in a vacuum environment;The thermal conductivity of the composite phase change material prepared above is enhanced by ball milling and mixing the carbon fiber doped with high thermal conductivity particles.The process conditions of acid and heat activation modification of attapulgite were explored through experiments.It was found that the acid concentration of the best process of acid activation was 1 mol/L acid,and the temperature of the best process of heat activation was300 ℃.The pore volume of attapulgite increased by 43% and 20%,respectively,to 0.482cm3/g and 0.402 cm3/g.Composite phase change materials were prepared by adsorption of activated attapulgite and paraffin in vacuum,and their phase change enthalpies were 88.1 J/g and 96.7 J/g,respectively.With the addition of 1-5% carbon fiber,its thermal conductivity is increased by 86% to 0.67 W/(m · K),which has good cycle stability.Using the knowledge of numerical heat transfer and fluid mechanics,the physical problems of composite phase change materials are transformed into mathematical problems.In this paper,the D2Q9 model is used to calculate the characteristic points,and the LBM method is used to solve the above physical model.The heat transfer process of attapulgite,the heat transfer process of attapulgite based composite phase change energy storage materials,the heat transfer process of composite phase change energy storage materials with different thermal conductivity,the heat transfer process of composite phase change materials with different phase change enthalpy values and the heat transfer process of composite phase change materials with different phase change temperature ranges are explored through the above models.It has guiding significance for the optimization of the performance of composite phase change materials.At the same time,the performance of composite phase change materials can be described more intuitively through the concrete figures.