自然生长式绿化屋顶的热工特性实验研究

Study on Thermal Characteristics Experiments of Natural Growing Green Roof

为研究自然生长式绿化屋顶的热工特性,对自然生长式绿化屋顶和普通屋顶进行了实验研究,在连续晴天对该屋顶内外表面温度、室内空气温度和屋顶的热流密度进行测定。通过实测数据的对比分析发现,普通屋顶外边表面温度的日较差在27℃上下浮动,而自然生长式绿化屋顶外表面温度的日较差变化在5.6~15.3℃,后者更能有效缓解高峰热现象;屋顶内表面与室内空气的温差和热流密度值多为负值,对室内气温上升有抑制作用;自然生长式绿化屋顶能较好地实现自然气候条件下的被动式降温、隔热和削峰等热工特性,起到缓解高峰热作用,有效降低屋顶外表面的峰值温度;自然生长式绿化屋顶对室内散热起积极作用。

In order to study the thermal characteristics of natural growth green roof,the paper studies the natural growing green roof and ordinary roof.The temperature of the inner and outer surface of the roof,the indoor air temperature and the heat flux density of the roof were measured on continuous sunny days.Compared with the measured data,it is found that the diurnal temperature range of ordinary roof is 27℃,while the diurnal temperature range of natural growth roof is 5.6~15.3℃,which can alleviate the peak heat phenomenon more effectively.The temperature difference and heat flux between the inner surface of the roof and indoor air are mostly negative,which can inhibit the rise of indoor temperature.Natural growing green roof can better realize passive cooling,heat insulation and peak clipping thermal characteristics under natural climate conditions.It can alleviate the peak heat and effectively reduce the peak temperature of the outer surface of the roof.The natural growing green roof plays a positive role in indoor heat dissipation.