交变温度作用下填充PCM砖墙的动态传热特性  

DYNAMIC HEAT TRANSFER OF BRICK WALL FILLED WITH PHASE CHANGE MATERIALS(PCM) UNDER FLUCTUATING TEMPERATURES

作　　者：吴梁玉[1] 陈永平[1] 张程宾[1] 施明恒[1] 

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《太阳能学报》2012年第9期1593-1599,共7页Acta Energiae Solaris Sinica

基　　金："十一五"国家科技支撑计划重点项目(2008BAJ12B02)

摘　　要：采用enthalpy-porosity法建立交变温度作用下填充相变材料(PCM)的砖墙内伴有熔化和凝固相变过程的动态传热模型并进行数值计算,比较实心砖墙与PCM砖墙的室内侧壁温响应变化,分析讨论墙体中PCM填充份额和PCM填充空间分布对墙体动态传热过程的影响,并对填充PCM墙体结构进行性能评价。研究结果表明,填充PCM的砖墙结构由于其孔隙中填充的PCM通过熔化/凝固相变作用蓄存了潜热,有效削弱了外界温度变化对室内壁温的影响,对室内温度起到削峰填谷的作用。随着砖墙中填充PCM份额的增加,室内侧温度的波动幅度明显减小,且对室外交变温度作用的滞后效果也相应得到增强。对于相同的PCM填充份额,PCM的填充分布方式对砖墙的保温性能和温度滞后效果也存在一定影响,但影响并不明显。A model for thermal conduction accompanied with solidification and melting processes was developed by enthalpy-porosity technique and numerically analyzed to investigate the dynamic heat transfer characteristics of the brick wall filled with Phase Change Materials （PCM）. The dynamic heat transfer characteristic, which is represen- ted by inside wall surface temperature response, of brick wall filled with PCM was evaluated and compared with that of solid brick wall. The effects of PCM amount as well as spatial distribution of PCM on the dynamic heat transfer characteristic of the brick wall were investigated and discussed. It is indicated that the influence of outdoor temper- ature fluctuation on indoor temperature is weaken due to the filling of PCM, which can store latent heat via solidifi- cation or melting processes. In addition, with the increasing filling amount of PCM, the fluctuation of inside wall surface temperature is obviously smoothed. Correspondingly, the hysteresis in response to the outdoor temperature fluctuation is enhanced. However, unlike the PCM amount, the spatial distribution of PCM has no significant role on the thermal insulation performance and temperature hysteresis.

关 键 词：相变材料 交变温度 砖墙 动态传热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]