Numerical study of heat gradient and crossing energy to around building walls containing phase change materials in Kashan temperature conditions

The application of phase change materials (PCM) in the variant parts of building because of the high capacity these materials, lead to an improvement in temperature conditions and reduction in energy consumption. Due to the high dependency of the performance of these materials to the ambient temperature fluctuations, their applications in climates with extreme temperature fluctuations has a significant impact on reducing the temperature fluctuations inside the building as well as energy consumption. In this study Kashan hot temperature conditions as ambient temperature, walls with normal concrete, thickness of 10 and 20 cm and height of 100 cm were modeled in FLUENT software. Some kinds of PCM for these temperature conditions were considered and the best was chosen. Numerical results show that, the presence of PCM reduces the temperature fluctuations of the inner surface of walls about 4 ° C and the position in the inner surface have better result but totally changing in PCM position does not have great impact on ultimate results. Moreover, changing in number of PCM thickness does not have great influence on the temperature function. According to the result, Parafin has better function for Kashan and for every climate, appropriate PCM should be chose.