Verification of program accuracy for illuminance modelling: assumptions, methodology and an examination of conflicting findings
Verification of program accuracy for illuminance modelling: assumptions, methodology and an examination of conflicting findings
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照度建模程序准确性的验证：假设、方法和对相互矛盾的结果的检查
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发表时间：
2004
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通讯作者：
J. Mardaljevic
中科院分区：
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作者：
J. Mardaljevic
，！本文考察了在照明模拟程序验证研究中通常做出的假设的作用，并量化了结果对关键模型参数（如天空条件和表面反射率）不确定性的敏感性。实际出现的阴天通常采用近似CIE标准阴天，以便将预测结果与实际建筑物的测量结果进行比较。这一假设的有效性通过对真实天空亮度分布的测量进行了验证。当照度的直接分量很小时，照度预测对指定的表面反射率特别敏感。确定了一些可能导致建筑物外立面表面反射率估计不精确的混杂因素，并提出了一种最小化其影响的方法。这项研究表明，通常做出的关于天空条件的假设和模型参数的适度不精确可能导致对程序精度的错误评估。现有验证结果可以外推到非常不同的应用场景的程度，在报告的程序准确性冲突评估的上下文中进行了讨论。
,!This paper examines the role of assumptions commonly made in validation studies for lighting simulation programs and quantifies the sensitivity of results to uncertainties in key model parameters such as sky conditions and surface reflectivity. Actually occurring overcast skies are often taken to approximate the CIE standard overcast sky for the purpose of comparing predictions against measurements in real buildings. The validity of this assumption is tested against measurements of the sky luminance distribution for real skies. Illuminance predictions are particularly sensitive to the assigned reflectance of surfaces when the direct component of illumination is small. A number of confounding factors that can lead to imprecise estimates of surface reflectivity for building facades are identified and a methodology to minimize their effect is proposed. This study reveals that commonly made assumptions with respect to sky conditions and moderate imprecision in model parameters can lead to erroneous assessments of program accuracy. The degree to which existing validation findings can be extrapolated to very different application scenarios is discussed in the context of reported conflicting assessments of program accuracy.