介绍了一种用于测定天窗热传导系数的实验室测试程序和一种有防护的热箱装置。天窗可以在倾斜角度下进行测试，倾斜角度可以从水平角度的20°到90°不等。确定天窗R值的实验程序基于试样温暖侧和天气侧对流传热的相关性。这种相关性是通过在倾斜位置使用校准传递标准（CTS）进行校准测量得到的。结果表明，沿倾斜CTS的对流换热与沿垂直CTS的对流换热有很大不同。CTS组件内传导传热的三维模拟结果与实验结果吻合良好。 对校准实验和天窗测试进行了完整的不确定度分析。发现与无框架试样的热传导系数相关的实验相对不确定度为±6%。单元:科学:研讨会，ASHRAE交易，第106卷，第页。2.

A laboratory test procedure and a guarded hot box facility used to determine the thermal transmission coefficient of skylights are described. Skylights can be tested at an angle of inclination that can be varied from 20° to 90° off the horizontal. The experimental procedure, to determine the skylight R-value, is based on a correlation for the convective heat transfer on the warm side and the weather side of the test specimen. This correlation is obtained from calibration measurements using a calibrated transfer standard (CTS) in the inclined position. The results show that the convective heat transfer along an inclined CTS is substantially different from that along a vertical CTS. Three-dimensional simulations of the conductive heat transfer within the CTS assembly are found to be in good agreement with the experimental results. A complete uncertainty analysis for the calibration experiments and for skylight testing is presented. It is found that the experimental relative uncertainty associated with the thermal transmission coefficient of the test specimen without the frame is of the order of ±6%.Units: SI