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Evaluation of dynamic sky-type using novel angular sky luminance measurement system

机译：使用新型角度天空亮度测量系统评估动态天空类型

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摘要

Standard sky-types of the established Commission International de l'Eclairage (CIE) sky-models are employed for generating sky-luminance distribution datasets in most building daylight simulation packages, which are used for predicting indoor illuminance distribution. However, sky-type can vary on diurnal and seasonal basis; and there is a need for identifying closest sky-type at different time-points for better indoor illuminance predictions. This paper aims at recommending closest sky-model for measured angular sky-luminance distribution sets through comparison with established CIE standard skies. A novel design of sky-luminance measurement device using calibrated Light Dependent Resistors is proposed to measure incident illuminance from 265 discrete sky positions every 5 min. Statistical analysis is performed on 143,100 distinct data-points corresponding to 540 representative datasets measured across 5-month period at Mumbai, and the closest CIE sky-type for various hours is recommended based on frequency of occurrence. A range of 9 sky-types of the CIE sky-model was determined as closest model sky-set, with sky-types 2, 4, 5, 6, 7, 8, 10, 11 and 13 assessed as closest sky-type for different time-points across the measured datasets. CIE sky-type 8 is identified dominating over 50% of measured datasets - 51.6% in November, 53.6% in January, 52.6% in March and 71.5% in April. Measured sky distribution is observed to generally follow trend of overcast to intermediate to clear sky-types in morning hours, and opposite in evening hours. This approach of recommending closest sky-type as simulation input as against using generic sky-types can enhance the accuracy of building indoor daylight predictions.
机译：已建立的国际照明委员会（CIE）天空模型的标准天空类型用于生成大多数建筑物日光模拟包中的天空亮度分布数据集，这些数据集用于预测室内照度分布。但是，天空类型会在每日和季节性的基础上有所不同。为了更好地预测室内照度，需要在不同时间点确定最接近的天空类型。本文旨在通过与已建立的CIE标准天空进行比较来推荐最接近的天空模型，以用于测得的角天空-亮度分布集。提出了一种新的设计的使用标定的光敏电阻的天空亮度测量设备的设计，该设备每5分钟测量265个离散天空位置的入射照度。对在孟买5个月内测得的540,100个代表性数据集的143,100个不同的数据点进行了统计分析，并根据发生频率建议在各个小时内最接近的CIE天空类型。 CIE天空模型的9种天空类型的范围被确定为最接近的模型天空集，其中2、4、5、6、7、8、10、11和13个天空类型被评估为最接近的天空类型。跨测量数据集的不同时间点。确定的CIE天空类型8占测量数据集的50％以上-11月为51.6％，1月为53.6％，3月为52.6％，4月为71.5％。在早晨，观测到的天空分布通常遵循多云到中空至晴空的趋势，而在傍晚则相反。与使用通用天空类型相比，这种建议使用最接近的天空类型作为模拟输入的方法可以提高建筑物室内日光预测的准确性。

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