石蜡型复合相变材料蓄热性能实验研究

hermal performance of paraffin as composite phase change material (PCM) has been improved by adding expanded graphite which has high adsorption and high heat conductivity. The heat storage characteristics of the composite paraffin as PCM were studied with fined tube heat exchanger in cuboid. The heat storage rule is summarized by testing the effect of different quality percentages of expanded graphite in the charging process at different temperatures. Experimental results showed that time of charging become much shorter as the quality percentage of expanded graphite in composite PCM increases. The effect of temperature of heat resource on charging process is obvious, especially at low temperatures. Within the range of experimental testing, addition of expanded graphite has little impact on the phase transition temperature of paraffin.