夜间通风相变复合墙体动态传热模拟

王雯翡, 王昭俊

哈尔滨工业大学市政环境工程学院



摘要:

为研究由相变混凝土复合墙体构造的房间在夜间通风下的热环境,利用焓法建立结合夜间通风的相变混凝土复合墙体动态传热和房间传热数学物理模型,模拟研究北京地区夏季和过渡季应用该相变复合墙体动态传热和室内热环境的时变特性.对该相变复合墙体传热的影响因素,如相变温度、相变层厚度、通风次数、通风时间以及相变层和绝热层的位置等进行优化分析.优化结果为:相变材料内置,相变温度26℃,相变层厚度25 mm,夜间通风时间早晨4:00～6:00,通风次数25次/h.

关键词:  相变墙体传热  夜间机械通风  室内热环境  数值模拟  节能

DOI：10.11918/j.issn.0367-6234.2011.04.011

分类号:

基金项目:黑龙江省博士后科研启动资助金项目(LBH-Q07039)



Simulation on dynamic thermal characteristics on phase-change composite wall combined with night ventilation

WANG Wen-fei, WANG Zhao-jun

School of Municipal and Environmental Engineering,Harbin Institute of Technology, 150090 Harbin,China

Abstract:

To study the thermal environment of the room which is enveloped by the phase-change concrete composite wall with night mechanical ventilation,the dynamitic heat transfer mathematical physics model of the phase-change concrete composite wall with night mechanical ventilation and thermal balance model of the room are given based on enthalpy method.The dynamic heat transfer performance and indoor thermal environment are simulated in summer and the transitional seasons when the phase-change composite walls are applied in Beijing.The influencing factors of the phase-change composite wall,such as phase-change temperature,phase-change layer thickness,ventilation rate,ventilation time,and the locations of phase-change layer and the insulation layer are analyzed.The optimal results are as follows: phase-change layer should be as the inner layer,phase-change temperature is 26 ℃,phase-change layer thickness is 25 mm,ventilation time is 4:00 am to 6:00 am,and ventilation rate is 25 ach/h.

Key words:  heat transfer of PCM wall  mechanical night ventilation  indoor thermal environment  simulation  energy efficiency