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The impact of sun sail-shading strategy on the thermal comfort in school courtyards
Building and Environment ( IF 7.1 ) Pub Date : 2021-06-11 , DOI: 10.1016/j.buildenv.2021.108046
Dalia Elgheznawy , Sara Eltarabily

Recently, achieving outdoor thermal comfort has attracted considerable attention in many studies in regions with hot and humid climates. Sun sails have been used as a traditional street-shading strategy in cities to improve outdoor thermal comfort, but their advantages in achieving thermal comfort in school courtyards remain unexplored. This study improves thermal comfort in school courtyards by studying the effect of the sun sail-shading strategy. A case study using the sun sail-shading strategy in El-Safwa School courtyard in Port Said, Egypt, is simulated during school time. Field measurements were conducted in specific locations in the courtyard. Microclimate models were simulated using ENVI-met V4.4.5 and Rayman 1.2 software. Several proposed cases have been studied based on the courtyard shading coverage ratio varying from 0% to 100% shaded with black sun sails. Hence, by adding 60% or above sun-sail shading in the school courtyard, the simulation results revealed a reduction in the air temperature (Ta), with an average difference of 0.5 °C, reduction in the average predicted mean voted (PMV) values above 0.6, and reduction in the mean radiant temperature (Tmrt) average values in most of the receptor points (approximately more than 20% reduction). The analyzed results of the physiological equivalent temperature (PET) and standard effective temperature (SET) showed the futility of using 40% sun sail-shading in the school courtyard, and the proper court coverage ratio to use is 60%.



中文翻译:

太阳帆遮阳策略对学校庭院热舒适性的影响

最近,在气候炎热潮湿的地区,实现室外热舒适性在许多研究中引起了相当大的关注。太阳帆已被用作城市的传统街道遮阳策略,以提高室外热舒适度,但它们在实现学校庭院热舒适度方面的优势仍未得到探索。本研究通过研究太阳帆遮蔽策略的效果来提高学校庭院的热舒适度。在埃及塞得港的 El-Safwa 学校庭院中使用太阳帆遮蔽策略的案例研究是在学校期间模拟的。现场测量是在庭院的特定位置进行的。使用 ENVI-met V4.4.5 和 Rayman 1.2 软件模拟小气候模型。根据庭院遮阳覆盖率从 0% 到 100% 不等,黑色太阳帆遮蔽的情况下,已经研究了几个提议的案例。因此,通过在学校庭院中增加 60% 或以上的遮阳,模拟结果显示气温(Ta)降低,平均差异为 0.5°C,平均预测平均投票(PMV)降低值高于 0.6,并且大多数接收器点的平均辐射温度 (Tmrt) 平均值降低(降低约 20% 以上)。生理等效温度(PET)和标准有效温度(SET)的分析结果表明,在学校庭院中使用40%的遮阳帘是徒劳的,而适宜的球场覆盖率为60%。通过在学校庭院中增加 60% 或以上的遮阳,模拟结果显示气温 (Ta) 降低,平均差异为 0.5 °C,平均预测平均投票 (PMV) 值降低0.6,并且大多数接收器点的平均辐射温度 (Tmrt) 平均值降低(降低约 20% 以上)。生理等效温度(PET)和标准有效温度(SET)的分析结果表明,在学校庭院中使用40%的遮阳帘是徒劳的,而适宜的球场覆盖率为60%。通过在学校庭院中增加 60% 或以上的遮阳,模拟结果显示气温 (Ta) 降低,平均差异为 0.5 °C,平均预测平均投票 (PMV) 值降低0.6,并且大多数接收器点的平均辐射温度 (Tmrt) 平均值降低(降低约 20% 以上)。生理等效温度(PET)和标准有效温度(SET)的分析结果表明,在学校庭院中使用40%的遮阳帘是徒劳的,而适宜的球场覆盖率为60%。大多数接收点的平均辐射温度 (Tmrt) 平均值降低(降低约 20% 以上)。生理等效温度(PET)和标准有效温度(SET)的分析结果表明,在学校庭院中使用40%的遮阳帘是徒劳的,而适宜的球场覆盖率为60%。大多数接收点的平均辐射温度 (Tmrt) 平均值降低(降低约 20% 以上)。生理等效温度(PET)和标准有效温度(SET)的分析结果表明,在学校庭院中使用40%的遮阳帘是徒劳的,而适宜的球场覆盖率为60%。

更新日期:2021-06-15
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