大进深房间冬季室内热环境分析

Measurement and analysis of indoor thermal environment in large room in winter

通过搭建大进深房间模型,测试冬季非空调工况下室内热环境,分析了室外气温和室内得热量对房间进深方向温度分布的影响.实验结果表明:围护结构热惯性使围护结构温度变化和室内温度变化相对于室外气温变化有明显衰减,围护结构传热量与人体模型散热量基本相等,房间得热与失热基本平衡;在人体模型散热形成的热羽流作用下,室内高度方向有明显的温度分层,但在外围护结构冷表面和人体模型热表面的共同作用下,室内同一高度不同进深处的温度分布并未呈现外低内高的简单规律;在不同室外温度和人体模型散热量时,沿房间进深方向不同位置离地面0.2~1.4m高度的平均温度有相似的分布规律,离外墙3.0m处温度最低,4.2m处温度最高,内外区分界线离外墙3.0~3.6m.

Indoor thermal environment in a large model room without air conditioning in winter is tested.The effects of outdoor air temperature and indoor heat gain on the temperature distribution along the depth of the room are analyzed.The results indicate that the variations of building envelope temperature and indoor air temperature are obviously less than the variation of outdoor air temperature owing to the thermal inertia of building envelope The heat transfer through building envelopes is nearly equal to the heat dissipation of human body models so the heat gain and heat loss of the room are almost in balance.Thermal plume produced by body models result in the temperature stratification along the room height.However,air temperatures at the same height and different depths of the room are scattered because of the influences of cold surface of building envelope and hot surface of body model.For different outdoor air temperature or indoor heat gain,the profiles of average temperature at the height of 0.2 m and 1.4 m in different positions along the depth of room are similar.Specifically,air temperatures at the positions of 3.0 m and 4.2 m away from the external wall are the lowest and highest respectively,and the boundary between the interior and the peripheral zones is about 3.0 m to 3.6 m away from the external wall.