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A Novel Simulation Framework for Comfort-based Assessments of Window Designs 一种新的基于舒适度的窗户设计评估仿真框架
近几十年来,许多城市中心见证了高层住宅建筑的急剧增长,其中许多建筑的窗墙比(WWR)很高,这是出于美观和视觉舒适的考虑。然而,许多公开的调查已经确定窗户是导致热不适的主要原因。根据对文献的回顾,发现窗户系统通过以下四种途径导致热不适:i)室内空气温度ii)直接太阳辐射,iii)红外辐射,以及iv)下沉气流。传统的热舒适性评估方法仅考虑室内空气温度和红外辐射,因此不足以为高WWR空间提供全面的热舒适性评估。 为了弥补这一差距,本研究提出了一种新的模拟策略,该策略使用EnergyPluss进行热环境建模,并使用Fanger的PMV模型作为基线方法来研究热区的时空热舒适性能。然后,所讨论的模拟策略对Fanger模型的输入和输出进行调整,以将直接的太阳能和气流对热舒适性的影响结合起来。结果表明,在没有这些调整的情况下,Fanger的模型低估了太阳照射时的温暖不适和夜间的寒冷不适。研究还发现,两种相反的舒适条件(例如,夏季夜间的高空气温度和窗户通风)之间可能会发生抵消,导致预测的热舒适性降低。 因此,建议将本文提出的调整方法和舒适性计算纳入热舒适标准。引用:佛罗里达州奥兰多2020年冬季会议论文
Many urban centers have witnessed dramatic growth in the construction of high-rise residential buildings in recent decades andmany of these buildings feature a high window-to-wall (WWR) ratio for aesthetic reasons and visual comfort. However, manypublished surveys have identified windows as the leading source of thermal discomfort. Based on a review of the literature, windowsystems have been found to contribute to thermal discomfort through the four following pathways: i) indoor air temperature ii)direct solar radiation, iii) infrared radiation, and iv) downdraft. Conventional approaches for thermal comfort assessment onlyconsider indoor air temperature and infrared radiation, thus making them insufficient in p roviding a comprehensive thermalcomfort assessment for high WWR spaces. To bridge this gap, this study presents a novel simulation strategy that uses EnergyPlusfor thermal environment modelling and Fanger’s PMV model as the baseline approach to study the spatiotemporal thermal comfortperformance of a thermal zone. The simulation strategy in question then implements adjustments on inputs and outputs of Fanger’smodel to incorporate direct solar and draft effects on thermal comfort. The results demonstrate that Fanger’s model, without theseadjustments, underpredicts warm discomfort during times with solar irradiation and cold discomfort during the nighttime. It wasalso found that counteractions between two opposing comfort conditions (e.g. high air temperature and window draft during thesummer nighttime) may occur, leading to reductions in predicted thermal comfort. It is therefore recommended that the adjustmentapproaches presented in the paper and the comfort calculations be incorporated into thermal comfort standards.
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