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Minimum Daylight Autonomy: A New Concept to Link Daylight Dynamic Metrics with Daylight Factors

机译：最小日光自治：将日光动态指标与日光因素联系起来的新概念

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摘要

Daylight metrics act as a useful tool to quantify the potential of natural light in an architectural space as well as the energy savings promoted by a suitable design of windows, atriums, and skylights. Accordingly, a new indoor lighting metric is proposed, minimum daylight autonomy, defined as the percentage of occupied time when an illuminance threshold can be met by daylight alone under continuous overcast sky conditions. This novel concept can determine an approximation of the maximum use of electric lighting and the quantification of minimum energy savings without the need for advanced calculation tools. Although daylight factor is the most widespread concept, it cannot forecast energy savings as accurately as dynamic metrics. In addition, daylight autonomy is the most usual dynamic definition, because it estimates the energy consumption of on-off electric lighting systems depending on weather conditions. However, there is no link between static and dynamic metrics, because both concepts are based on different variables. This research proposes the calculation procedure for minimum daylight autonomy, as well as the equations that serve to predict dynamic metrics based on static metrics, after confirming the accuracy of the simulation program that calculates the metrics using a test cell under real conditions.
机译：日光指标是量化建筑空间中自然光的潜力以及通过适当设计窗户，中庭和天窗所促进的节能的有用工具。因此，提出了一种新的室内照明度量标准，即最小日光自治度，其定义为在连续阴天条件下仅日光可以满足照度阈值时所占时间的百分比。这种新颖的概念无需使用先进的计算工具即可确定最大程度地利用电照明的近似值和最小节能量的量化。尽管日光因素是最普遍的概念，但它无法像动态指标一样准确地预测节能量。另外，日光自治是最常用的动态定义，因为它根据天气情况估算开关式电子照明系统的能耗。但是，静态和动态指标之间没有联系，因为这两个概念都基于不同的变量。这项研究提出了最小日光自主性的计算程序，以及在确定真实条件下使用测试单元计算度量的模拟程序的准确性之后，基于静态度量预测动态度量的方程式。

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