Thermodynamics HW Solutions 899

Thermodynamics HW Solutions 899 - Chapter 11 Fundamentals...

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Chapter 11 Fundamentals of Thermal Radiation 11-77E A house has 1/8-in thick single pane windows with aluminum frames on a West wall. The rate of net heat gain (or loss) through the window at 3 PM during a typical day in January is to be determined. Assumptions 1 The calculations are performed for an “average” day in January. 2 The frame area relative to glazing area is small so that the glazing area can be taken to be the same as the window area. Properties The shading coefficient of a 1/8-in thick single pane window is SC = 1.0 (Table 11-5). The overall heat transfer coefficient for 1/8-in thick single pane windows with aluminum frames is 6.63 W/m 2 . ° C = 1.17 Btu/h.ft 2 . ° F (Table 9-6). The total solar radiation incident at a West-facing surface at 3 PM in January during a typical day is 557 W/m 2 = 177 Btu/h.ft 2 (Table 11-4). Analysis The solar heat gain coefficient (SHGC) of the windows is determined from Eq.11-57 to be SHGC = 0.87 × SC = 0.87 × 1.0 = 0.87 The window area is:
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This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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