Due to climatic change, increasing thermal loads in buildings and rising living standards, comfort cooling in buildings is becoming increasingly important and the demand for comfort cooling is expanding very quickly around the world. Cool thermal storage systems have the potential to become one of the primary solutions to the electrical power imbalance between production and demand, but also shift cooling energy use to off-peak periods and avoid peak demand charges. Cool storage system using phase change materials can be used for peak load shifting if they are installed in the building. Phase change material (PCM) are one of the latent heat materials having low temperature range and high energy density of melting – solidification compared to the sensible heat storage. The tests on transient heat transmissions across different roof structures were conducted. It was found that when installing PCM in the withering course (WC-mixture of broken bricks and lime mortar) region nearly uniform roof bottom surface temperature was maintained.

Key words: Building roof, Energy storage, heat transmission, Latent heat storage(LHS) , Natural Cooling, Phase Change
Material (PCM),Withering Course (WC).