自然通风条件下轻钢活动板房热环境计算研究

Computation of thermal environment of light-weight steel temporary house under natural ventilation condition

为研究自然通风条件下轻钢活动板房围护结构及室内空气温度的变化,在一标准规格的轻钢活动板房基础上构建几何模型,建立了模拟围护结构传热的一维非稳态传热方程、室内空气温度变化的热平衡方程及建筑自然通风量的换气方程。选取南方地区夏季某一天的气象参数,计算了24h内围护结构温度与室内空气温度。计算结果表明,聚苯乙烯(EPS)夹芯板有良好的隔热作用;但在太阳照射较强烈时,房顶内表面的温度仍然偏高,因此,仍需要加强房顶的隔热;在自然通风条件下,室外温度变化对室内温度的影响十分显著。

In order to investigate the air temperature variations within the envelope and inside the light-weight steel temporary house under natural ventilation condition, a geometric model based on one standard light-weight steel temporary house was established; and the one-dimensional unsteady heat transfer equation was established to simulate the thermal transfer of the building envelope. Also the thermal balance equation was combined with the natural ventilation to simulate variation of the indoor air temperature and the natural ventilation of the building. The meteorological data of one summer day in south China was used to compute the temperature variation of building＇s enve- lope and indoor air within 24 hours. The computation results show that the EPS sandwich board has a satisfied heat-insulating perfor- mance. However, internal surface temperature of the roof becomes relatively high when the sunshine becomes strong. Hence, heat insula- tion of the roof should be further improved. Under the condition of natural ventilation, variation of the outdoor air temperature has obvious influence to the indoor air temperature.