1968年11月，向TC 2.5（开窗）提交了一份报告，涵盖了根据RP69进行的研究，研究了内表面空气速度和温度对建筑开窗的热量增益和损失的影响。该研究仅限于单玻璃类型，以及带有窗帘或百叶窗帘遮阳的单玻璃，其结果于1970年7月在第2156号技术文件中向协会报告。1 Bxiefly指出，该研究表明，当送风扫过内部玻璃表面时，热增益和热损失均显著增加。鉴于这些发现，TC 2.5建议进行进一步研究，以确定在开窗中使用隔热玻璃而非单一玻璃的效果。这项研究被授权为RP 104，于1969年10月1日开始，现报告如下。在冷负荷（热增益）分析和测试中使用了三种类型的中空玻璃:（1）双透明，由1/4英寸的玻璃组成。透明板面板，1/2英寸。 空气空间，还有1/4英寸。透明板；（2） 吸热透明，由1/4英寸。户外的吸热玻璃板。或侧边，1/2英寸。空气空间，1/4英寸。室内侧的透明板面板；（3） 反光且清晰，由1/4英寸。室外侧的反光玻璃板，1/2英寸。空气空间，1/4英寸。亲爱的室内侧的板面板。每种类型都在没有室内遮阳的情况下进行了分析和测试（图1），室内遮阳由浅色百叶窗组成，室内遮阳由中等褶皱组成（图2）。在热负荷（热损失）研究中仅使用了类型（1）和（3），理论上，前两种类型的热损失基本相同，因为它们在标准条件下的“U”值基本相同。引用:肯塔基州路易斯维尔ASHRAE Transactions第79卷第2部分

In November, 1968 a report was made to TC 2.5 (Fenestration) covering research conducted under RP69-Effect of Inner Surface Air Velocity and Temperature Upon Heat Gain and Loss Through Building Fenestrations. That study was limited to single glass types, and single glass with drapes or venetian blind shading, and the results were reported to the Society in Technical Paper No. 2156 in July, 1970.1 Bxiefly stated, the study showed significant increase both in heat gains and heat losses when supply air sweeps the interior glass surface. In view of those findings, TC 2.5 recommended a further study to determine the effect if insulating rather than single glass were used in the fenestration. Such a study was authorized as RP 104, was started October 1, 1969, and is reported here.Three types of insulating glass were used in the cooling load (heat gain) analysis and testing: (1) double clear, consisting of a 1/4 in. panel of clear plate, a 1/2 in. air space, and a second 1/4 in. clear plate panel; (2) heat absorbing and clear, consisting of a 1/4 in. panel of heat absorbing glass on the outdo.or side, a 1/2 in. air space, and a 1/4 in. clear plate panel on the indoor side; (3) reflective and clear, consisting of a 1/4 in. panel of reflective glass on the outdoor side, a 1/2 in. air space, and a 1/4 in. dear. plate panel on the indoor side.Each type was analyzed and tested without indoor shading (Fig. 1), with indoor shading consisting of a lightcolored venetian blind, and with indoor shading consisting of a medium drape (Fig. 2). Only types (1) and (3) were used in the heating load (heat loss) studies, the theory being that heat losses through the first two types would be essentially the same, since their "U" values under standard conditions are essentially the same.