【作者】 张群力； 狄洪发； 张寅平； 周国兵； 肖伟；

【Author】 ZHANG Qunli, DI Hongfa, ZHANG Yinping, ZHOU Guobing, XIAO Wei (Department of Building Science , Tsinghua University , Beijing 100084, China)

【机构】 清华大学建筑技术科学系；

【摘要】 设计出一种利用不同相变温度的定形相变材料蓄能的吊顶形式。建立该吊顶在室内热环境稳态工况下的传热过程数学模型。通过数值模拟的方法分析了该吊顶在冬季采暖和夏季空调工况下的传热性能及其影响因素。对比分析定形相变材料蓄能吊顶与混凝土蓄能吊顶的热性能差异。研究表明,该吊顶在冬季蓄热和夏季蓄冷工况下均具有较高的蓄热效率,其蓄能效率要比混凝土吊顶蓄能效率高30％～40％。通过对吊顶热性能影响因素的敏感性分析得知,相变材料的热导率主要影响吊顶蓄热效率和蓄热量,相变温度和相变潜热主要影响吊顶表面热通量的衰减时间。更多还原

【Abstract】 A structure of the radiant heating or cooling ceiling with shape-stabilized phase change material (SSPCM) for thermal energy storage was illustrated. A mathematical model of analyzing the thermal performance of such ceiling modular in the condition of the stable indoor environment was developed. The thermal performance difference between the SSPCM ceiling and the concrete ceiling was compared by using the model. The effect of thermal properties of the SSPCM on the average heat flux and energy storage efficiency of such ceiling modular was analyzed by simulation. The simulation results showed that the SSPCM ceiling can maintain stable heat flux for a long time, which was difference with rapid attenuation of heat flux of concrete ceiling. The delay time of heat flux was affected greatly by the phase transition temperature of SSPCM. The energy storage efficiency and the energy storage capacity of the SSPCM ceiling were affected greatly by thermal conductivity of SSPCM. The energy storage efficiency of the SSPCM ceiling was 30%-40% larger than that of concrete ceiling, which make much more thermal energy be stored during nighttime and utilized for heating or cooling during daytime. The SSPCM ceiling can keep high storage efficiency on the conditions of both cooling storage and heating storage.更多还原