自然通风、冷屋顶与外遮阳对室内热环境改善效果实验研究
Experimental study on improvement effect of natural ventilation,cold roof and external shading on indoor thermal environment
摘要：
对自然通风、冷屋顶与外遮阳3种被动技术在夏热冬冷地区的综合隔热降温作用及对室内热环境的改善效果进行了测试分析。结果显示:当三者协同作用时,外遮阳可以遮挡太阳辐射,有效降低窗户的得热量,实验房间玻璃外表面温度较对比房间最高降幅达到7.6 ℃;高反射涂料的应用使屋顶表面降温幅度达到10.3 ℃,有效减少了屋顶的温差传热;自然通风系统成功诱导了连续并具有周期性波动的气流,并对埋管内空气有着良好的预冷效果;实验房间室内温度稳定在26.8～27.9 ℃之间,室内热环境得到了明显的改善。
Abstract：
The comprehensive thermal insulation and cooling effects of natural ventilation,cold roof and external shading in the hot summer and cold winter zone and the improvement effect on the indoor thermal environment are tested and analysed.The results show that when the three techniques work together,the external shading can block the solar radiation and effectively reduce the heat gain of the window,and the temperature on the outer surface of the glass in the test room is at most 7.6 ℃ lower than that in the reference room.The application of high reflective coating makes the roof surface temperature drop up to 10.3 ℃,which effectively reduces the temperature difference heat transfer of the roof.The natural ventilation system successfully induces continuous and periodic air flow,and has a well pre-cooled effect on the air in the buried pipe.The indoor temperature of the test room is stable between 26.8 and 27.9 ℃,and the indoor thermal environment is significantly improved.
Keywords:natural ventilation; cold roof; external shading; indoor thermal environment; solar chimney; high reflective coating