选取不同墙体材料时建筑房间内导热辐射与自然对流耦合换热问题的研究

INFLUENCE OF DIFFERENT BUILDING ENVELOP ON INDOOR COUPLED HEAT TRANSFER BETWEEN HEAT RADIATION AND NATURAL CONVECTION

对采用几种典型墙体材料时,建筑房间导热、辐射与自然对流耦合换热问题进行数值研究。计算采用SIMPLE算法、QUICK差分格式。计算结果表明,当室外环境相同时,分别采用灰砂砖砌体、空心砖砌体、聚苯板作为墙体材料,对室内温度及墙体内表面温度影响不同。选择聚苯板作为建筑围护结构的保温材料相对较好。昼夜温差较大的地区,可利用相变材料的蓄热性能,减小房间内的温度波动,提高热舒适度。对于建筑来说,利用墙体蓄热,将白天太阳辐射的一部分热量储存起来,到了夜间再释放出来,可降低白天的空调冷量,达到节能和环保的目的。

Numerical investigation using SIMPLE algorithm with QUICK scheme for indoor natural convection and heat transfer with different building envelop materials was conducted. The results suggest that the environmental influences on indoor with the different envelop materials are very different. The polystyrene board insulation wall is fitter for building envelop than the sand-lime brick and air brick. The phase change material is fit for in the north- ern part of the country where the temperature in the day is much higher than that at night. Using the phase change material, the temperature fluctuation range is diminished and the comfort evaluation is improved. Using the phase change material, the electricity peak is relieved. The energy utilization efficiency is improved and the using primary energy is decreased. Economizing on energy and protection of the environment can be realized