相变胶囊的蓄放热特性分析  

CHARACTERISTICS OF THE HEAT CHARGE AND DISCHARGE OF THE ENCAPSULATED PHASE CHANGE MATERIALS

作　　者：张海峰[1] 葛新石[1] 叶宏[1] 

机构地区：[1]中国科学技术大学热科学与能源工程系,合肥230027

出　　处：《太阳能学报》2005年第6期825-830,共6页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(50402009)

摘　　要：运用显热容法对相变胶囊在外部对流换热条件下的蓄放热特性进行了分析。对STEFAN数、BIOT数、相变半径等影响因素的分析结果表明,相变胶囊的优点表现为持续稳定的热流特性、对相变材料的导热性能要求不高、换热效率高、适用于在小温差条件下的热能存储和供给。Based on the apparent heat capacity method for solving the Stefan problems with phase change occurred in a temperature range, the characteristics of the heat charge and discharge of encapsulated phase change materials （PCMs） were analyzed under convective boundary condition. From the analysis of the effects of the Stefan number, the Biot number, and the phase change radius, the advantages of the PCM capsules are the stable and durative heat flow character, high efficiency of heat exchange, no demand of high thermal conductivity of the encapsulated materials, and specially adaptive to the heat charge and discharge in small temperature difference conditions.

关 键 词：相变胶囊 蓄放热特性 显热容法 

分 类 号：TK512.4[动力工程及工程热物理—热能工程]