Preparation And Experiemtal Study Of Thermal Insulating Wall Materials With PCM

Phase change materials (PCMs) are the energy storage materials that have considerably higher thermal energy storage densities, and are able to absorb or release large quantities of energy at a constant temperature by undergoing a change of phase, which have been the most potential and wide applied materials and the focus of research on energy saving and material scientific. A novel and efficient energy-saving building insulation materials are prepared by incorporating PCMs into traditional insulation materials, which generate significant research value, as well as notable economical and environmental benefits. In this paper, phase-change thermal insulating materials were prepared by adding shape-stabilized PCMs, which were fabricated by porous materials absorbing organic PCMs physically, and the application of this novel insulating material in building structures was also evaluated.PCMs in this paper were classified according different requirements; the physical, chemical and thermal properties of various PCMs were presented. From the compatibility of PCMs with construction materials and economic consideration, single phase change materials were optimized for building energy-efficient. To overcome the defaults of single PCMs, composite PCMs were prepared and selected for building energy-saving. Decanoic acid-lauric acid(DA-LA) dual compound phase change material is fabricated based on Schroder formula in the laboratory. When the mol concentration of decanoic acid is 40-51%, the phase change temperature of DA-LA is 25-30℃and the phase change latent heat of DA-LA is 121-127J/g.Various porous materials were selected to prepare shape-stabilized PCMs by physical absorbing melted composite PCMs. According absorption of PCM and morphology of shape-stabilized PCMs, optimum preparation technology- a water bath temperature of 50℃, duration of 1h under atmospheric pressure- is determined. Through thermal-physical properties, leakage degree, durability and compatibility of shape-stabilized PCMs, it turns out that phase change temperature of shape-stabilized PCMs with DA-LA was 25-30℃, and phase change latent heat was 100-110J/g; composite PCMs were largely distributed in porous materials, were compatible with porous materials, and were considerably stable; thermal energy storage density was enhanced by surfactant; durability of shape-stabilized PCMs was improved considerably by encapsulation with epoxy resin and styrene-acrylic emulsion; phase change temperature of paraffin ternary compound PCMs was less than 30℃, phase change latent heat was more than 110J/g.A novel insulating mortar with PCMs was prepared with shape-stabilized PCMs based on expanded perlites, regenesis EPS granules and DA-LA. Compared to EPS insulating board with PCMs and gypsum wallboard with PCMs by immersion directly, durability and stability of the novel insulating mortar were better, showing certain application prospects. In addition, research results of insulation cabinet with PCMs demonstrated that PCMs were considerably beneficial to adjust temperature and save energy. Finally, energy-saving efficacy of insulation material with PCMs was also analyzed and evaluated, which provided important reference for achieving a high comfort, low energy consumption.