Phase-change building materials and its temperature control simulation

Abstract

In consideration of the important influence of the season change on the temperature difference, the poor thermal inertia of non-thermal insulation walls and the inflammableness of organic thermal insulation walls, it is designed to prepare the phase-change material into the phase-change mortar applied to the exterior of the building walls so as to improve the thermal inertia of the wall in summer. The phase-change material, taking the lowest eutectic mixture mainly formed with lauric acid and myristic acid, hereinafter referred to as ‘fatty acid’, as the main of phase-change material, and the expanded perlite as the inorganic carrier, is prepared into a phase-change aggregate by way of absorption, through encapsulating the aggregate, the optimal process parameters are then determined. The phase-change mortar with the phase-change perlite aggregate is prepared, and simulation test on the thermal performance of the temperature control is conducted. Laboratory results indicate that, the expanded perlite absorbs 200% fatty acid by way of vacuum absorption method, and is encapsulated by 67% polyurethane resin, and then becomes a stable phase-change perlite aggregate. Phase-change perlite-based mortar can achieve better temperature control effect, additionally, the increasing of the dosage of the fatty acid, the decreasing of the effective caloric value will become faster, and the longer the temperature delaying time as well as the greater the temperature dropping amplitude, meaning that the effect of controlling the temperature becomes more outstanding.

Keywords:

• Phase-change aggregate
• Fatty acid
• Phase-change mortar
• Thermal performance