Thermal Energy Storage And Phase Change Materials

2.1. Thermal energy storage and phase change materials Thermal energy storage (TES) system store excess thermal energy with different applications and materials and release it for later use. [1] For instance, TES systems is an available means to balanced energy demand between day time peak hours and night time lower usage of energy. Specially, with the applications such like solar collectors, thermal energy storage system can be used to collect summer heat and storage for winter space heating; and summer space cooling like wise. [2] Similar with other energy storage systems, TES systems provide a possibility to overcome the mismatch between energy generated and usage, which is an important environmental-friendly approach to solve the problems of present energy usage and carbon dioxide emissions. [3] Fig. 1 below shows about areas of research in thermal storage systems. There are three main challenges in thermal energy storage. One of the biggest issues is the heat transfer rates of the PCMs are much lower than the expected value which causes large amount of heat losses in the storage system; this means that the thermal conductivity still need to be improved by study on characterization enhanced techniques. For example, although the organic PCMs have high energy density, the slow heat transfer rate during phase change process limits their applicability in many domestic and commercial applications. [6] Beside, the heat transfer performance of the whole thermal system shouldShow MoreRelatedThe Use Of Pcms And Sensible Heat On The Thermal Performance Of Hot Water Tanks1499 Words   |  6 Pagescombined use of PCMs and sensible heat to improve the thermal performance of hot water tanks (HWT) hence to shift the peak power demand. And demonstrate a theoretical experiment results about comparison between the proposed system designs and the HWT without com bination of PCMs. 2. Background 2.1. 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