Abstract
This work is focused on enhancing the thermal effectiveness of autoclaved aerated concrete (AAC) by the application of phase change material (PCM) as a coating. The dynamics of heat transfer and the cooling load of air conditioning system in the two tested houses with different wall materials (AAC and AAC with PCM coating) were investigated. The work demonstrated that by coating phase change material onto the exterior surface of the building materials a significant increase in the thermal effectiveness of the building materials was achieved and determined by comparing the lower interior surface temperature, heat flux evolution and room temperature. The increase in thermal effectiveness was applied to the AAC. It was demonstrated that the cooling load and power consumption of air conditioning system in buildings using the wall-PCM coating combination can be reduced variously by about 25 %.DOI: http://dx.doi.org/10.5755/j01.ms.23.2.15451
Highlights
City buildings and offices and residential housing are the largest electricity consumers in modern cities, and building owners and occupiers pay a high price for their power consumption
One of the approaches to reducing energy consumption in buildings and enhancing the indoor thermal environment is the integration of phase change material (PCM) into a building or building services system, which was first used for thermal storage in buildings in 1980 [1], to increase thermal storage effectiveness
Experiments have been reported that used PCMs in PCM trombe walls [2, 3], wall boards [4 – 6], shutters or window [7], ceiling boards [8, 9] and roof [10 – 12]
Summary
City buildings and offices and residential housing are the largest electricity consumers in modern cities, and building owners and occupiers pay a high price for their power consumption. A decrease in energy dependence of buildings is one of the keys to reducing the amount and cost of energy consumption, and is required and being demanded in the development of new and sophisticated building designs. New materials and construction systems must contribute to meet power reduction requirements and thereby promote both energy conservation in construction and economic sustainability in energy generation. AAC is lightweight and has a highly porous structure (Approximately 80 % of the volume of the hardened material is made up of pores, 50 % being air pores and 30 % being micropores), a lower thermal conductivity, a higher heat resistance, a lower shrinkage, and an easier and faster construction process than traditional concrete [16 – 18]
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