窗户太阳能增益会强烈影响建筑能耗、峰值负荷和舒适度。遮阳设备通常用于控制太阳能增益。使用百叶窗尤其常见。人们迫切需要能够准确模拟这种设备的模型。作为第一步，本研究探讨长波辐射交换的机制。提出了计算空间平均光学特性（称为有效光学特性）的方法。建立了一个封闭模型来模拟辐射与板条表面的相互作用。六个封闭区域（而非四个）被用来解释盲板条可能重叠的原因。该光学模型允许将百叶窗视为一系列玻璃层中的平面均匀“黑匣子”层，再加上适当的对流模型，可将其纳入标准模型中- 三维中心玻璃传热分析。进行了样品计算，并讨论了由此产生的有效光学性质。与预期趋势和极限相比，该模型更具优势。还检查了板条曲率的影响。单位:双引文:研讨会论文，加利福尼亚州阿纳海姆，2004年

Window solar gain can strongly influence building energy consumption, peak loads, and comfort. Shading devices are routinely used to control solar gain. The use of venetian blinds is particularly common. There is a strong need for models that can accurately simulate this type of device. As a first step, this study deals with the mechanisms of longwave radiant exchange. Methods are presented by which spatially averaged optical properties (referred to as “effective” optical properties) can be calculated. An enclosure model was formulated to model the interaction of radiation with the slat surfaces. Six enclosure areas, rather than four, were used to account for the possible overlap of blind slats. This optical model allows the venetian blind to be treated as a planar, homogeneous ''black-box'' layer in a series of glazing layers and, coupled with the appropriate convection model, can be incorporated within a standard one-dimensional center-glass heat transfer analysis. Sample calculations were performed and the resulting effective optical properties discussed. The model compares favorably with expected trends and limits. The effect of slat curvature was also examined.Units: Dual