Calculation and measurement of mean room surface exitance: The accuracy evaluation
Calculation and measurement of mean room surface exitance: The accuracy evaluation
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平均房间表面出射度的计算和测量：精度评估
DOI：
10.1177/1477153518787836
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发表时间：
2018-07
影响因子：
2.5
通讯作者：
Wenjing Cai
中科院分区：
文献类型：
--
作者：
Qi Dai;Yingying Huang;Luoxi Hao;Wenjing Cai
Cuttle提出了一种新的室内照明设计方法-平均房间表面出射度，它关注的是照明的外观而不是视觉效果。其中，简单的计算方法和实用的测量策略是两个重要方面。Cuttle提出了一个简化的平均房间表面出射度计算公式，并提出可以通过从“将大部分空间带入视野”的位置测量间接角膜照度来估计平均房间表面出射度;然而，没有提供可靠的证据。在这项工作中，首先，我们证明了简化的方程是相当准确的，通过比较其预测的结果的基础上的数值模拟的表面反射率的组合范围很广。采用两个经过精心选择的光源位置，使其对简化方程具有相同的输入，但导致表面出射度分布非常不同，以进一步验证简化方程;其次，通过理论分析和数值模拟，我们发现，间接角膜照度和间接柱面照度随测量位置的变化很大，并且与平均房间表面有很大差异出离因此，我们得出结论，在以前的出版物中建议的测量平均房间表面出射度的方法可能不能提供准确的结果。
Cuttle proposed mean room surface exitance as a new interior lighting design methodology, which focuses on lit appearance rather than visual performance. A few challenges exist, among which, an easy calculation method and a practical measurement strategy are two important aspects. Cuttle has developed a simplified equation for mean room surface exitance calculation and proposed that mean room surface exitance can be estimated by measuring indirect corneal illuminance from a position that ‘brings most of the space into view’; however, no solid proof was provided. In this work, first, we demonstrate that the simplified equation is reasonably accurate by comparing its predictions with the results based on numerical simulation of a wide range of surface reflectance combinations. Two luminaire locations, which are carefully selected to have the same input to the simplified equation but leading to very different surface exitance distributions, are adopted to further verify the simplified equation; second, through a theoretical analysis and numerical simulation, we show that both indirect corneal illuminance and indirect cylindrical illuminance vary significantly with the measurement location and can be very different from mean room surface exitance. Therefore, we conclude that the method of measuring mean room surface exitance.suggested in prior publications may not provide accurate results.
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