夜间通风相变复合墙体动态传热模拟

为研究由相交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...

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

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.