This technology is a building wall structure and construction method for EIFS (Exterior Insulation and Finish Systems) where plastering mortar, mesh, cement-based finish, and paint layers are applied sequentially over insulation. It involves mixing paraffin-based phase-change materials (PCMs) into the mortar, finish, and paint at specific ratios, using a blend of two or more PCMs with non-overlapping phase-change temperature ranges.
Conventional interior and exterior finishes relied solely on air trapped within the micropores of insulation like expanded polystyrene to block heat transfer, limiting their thermal efficiency. Previous technologies utilizing PCMs were primarily focused on reducing floor heating energy, failing to effectively block outdoor air infiltration or reduce cooling energy during the summer.
This technology incorporates 5–10 parts by weight of PCM into plastering mortar, 1–10% into cement finish, and 5–10% into powder paint. By mixing two PCMs that react at different temperatures within the 10–40°C range at ratios from 2:8 to 8:2, it regulates seasonal response temperatures. The PCMs, such as n-tetradecane or n-octadecane, feature an average particle size of 2–10㎛ and a heat storage capacity of 100–260kJ/kg. Applicable to exterior insulation for residential and office buildings, green remodeling, and passive house envelopes, the low-temperature PCM raises indoor temperatures in winter, while the high-temperature PCM absorbs heat in summer, reducing year-round heating and cooling loads.
This invention was developed with support from the Ministry of Land, Infrastructure and Transport’s project for developing carbon-reducing concrete structural materials and energy-saving building materials, specifically for the development of low-environmental-impact building materials.
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