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All rights reserved. Any use is subject to the Terms of Use as given at the website. 21 Shading Coefficients for Single Glass and Insulating Glass* 18 14 38 12 18 14 38 12 18 14 14 * Refers to factory-fabricated units with 3⁄16 , 1⁄4 , or 1⁄2-in airspace or to prime windows plus storm sash. † Refer to manufacturer’s literature for values. ‡ Thickness of each pane of glass, not thickness of assembled unit. § Refers to gray, bronze, and green tinted heat-absorbing float glass. ‫ن‬ Combined transmittance for assembled unit.

2 Cooling load versus instantaneous heat gain The internal heat gains discussed above are often greater than the actual cooling load due to those gains. This is a result of heat storage in the building and furnishings—anything that has mass. The effect is shown in Fig. 4. The longer the heat gain persists, the more nearly the instantaneous cooling load will approach the actual cooling load. 13, pp. 38–42. 6. The load factor criteria pages should include schedules of use and occupancy, together with cooling load factors to be applied.

26, Table 42. (pp. 44–45) describe the sol-air data. When these data are combined with the inside design temperature, a cooling load temperature difference (CLTD) is obtained. 2) where q ϭ cooling load, Btu/h, for the given section U is the heat transfer coefficient for the given construction, and A ϭ area, ft2, of the given section. 20 (pp. 46–52) provide data for calculating the CLTD for various orientations and solar times. 4 Conduction and solar heat gain through fenestration Fenestration is defined as any light-transmitting opening in the exterior skin of a building.

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