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Influencing characteristics of phase change temperature on thermal
performance of phase change energy storage wall
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School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract The influencing characteristics of the relationship between phase change temperature of phase change material (PCM) and thermal environment of the wall on the thermal performance of PCM wall was analyzed by onedimensional enthalpy model. The essential laws to significantly improve the thermal performance of PCM wall were obtained. The complete melting and freezing processes were occurred ,and the unmelted and unsolidified PCM at the end of phase change processes is the fundamental guarantee for high thermal performance of PCM wall. The central temperature at the environmental temperature range of wall equals to the central phase change temperature of PCM,which is the basic condition for determining whether the PCM energy storage function can be used. The slight and persistent deviation of the two values can remarkably influence the effect of PCM. The low utilization ratio of PCM in wall can produce high control ability of environmental temperature fluctuations and achieve good thermal performance of PCM wall.
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