濕熱地區充氣薄膜屋面噴霧降溫實驗——以ETFE氣枕屋面為例
Experiment on cooling effect of inflatable membrane roof mist spray in hot-humid areas—A case study of ETFE cushion roof
摘要：
為明確濕熱地區屋面噴霧技術對充氣薄膜屋面的降溫效果，以廣州無限極廣場的乙烯-四氟乙烯共聚物（ETFE）氣枕屋面為研究對象，通過在夏季典型氣候條件下開展實驗測試，量化了該技術對屋面表面與下方室內產生的降溫效果，分析了屋面內外表面的熱流量變化，并建立了以氣象參數為自變量的屋面外表面降溫效果預測模型。結果表明：噴霧系統在全天產生的外表面與內表面降溫范圍分別為3.8~12.3 ℃與1.5~2.9 ℃；屋面噴霧可提高室內人員的熱舒適水平，室內空氣溫度與平均輻射溫度降溫范圍分別為0.2~0.3 ℃與0.2~1.0 ℃；在上午與下午時段可使進入室內的傳熱熱流量分別減少21.3%與33.9%，對降低建筑負荷具有積極作用；太陽輻射對屋面外表面降溫效果影響最大，其次是風速，而濕球溫度的影響最小。該技術不僅可在濕熱地區應用，在其他高輻射地區應用仍可實現良好的降溫效果。
Abstract：
In order to explicit the cooling effect of mist spray on the inflatable membrane roof in hot-humid areas adequately, an ethylene tetra-fluoro-ethylene (ETFE) cushion roof in Guangzhou Infinity Plaza is selected as the research object. The cooling effects of this technology on the roof surface and the indoor air are quantified by a field experiment under typical climate conditions in summer, the heat flux variations through the interior and exterior roof surfaces are analysed, and a prediction model for assessing the cooling effect of roof exterior surface is established with meteorological parameters as independent variables. The results indicate that the temperature drops of the exterior and interior surfaces generated by spray system are 3.8-12.3 ℃ and 1.5-2.9 ℃, respectively. The roof mist spray can significantly improve indoor thermal comfort, the average drops of the indoor air temperature and mean radiant temperature are 0.2-0.3 ℃ and 0.2-1.0 ℃, respectively. This technique can also reduce the heat flux entering the room by 21.3% and 33.9% in the morning and afternoon, respectively, which has a positive effect on reducing the building cooling load. Besides, the roof cooling effect is most affected by solar radiation, followed by wind speed, and lastly the wet-bulb temperature. This technique can not only be applied to hot-humid areas, but also can generate good cooling effect in other areas with strong radiation.
Keywords:hot-humidarea;inflatablemembraneroof;mistspray;coolingeffect;indoorthermalenvironment;heatflux