Thermodynamics HW Solutions 755

Thermodynamics HW Solutions 755 - Chapter 9 Natural...

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Unformatted text preview: Chapter 9 Natural Convection 9-88 The rate of heat loss through an double-door wood framed window and the inner surface temperature are to be determined for the cases of single pane, double pane, and low-e triple pane windows. Assumptions 1 Steady operating conditions exist. 2 Heat transfer through the window is one-dimensional. 3 Thermal properties of the windows and the heat transfer coefficients are constant. 4 Infiltration heat losses are not considered. Properties The U-factors of the windows are given in Table 9-6. Analysis The rate of heat transfer through the window can be determined from ) ( window overall window o i T T A U Q − = & where T i and T o are the indoor and outdoor air temperatures, respectively, U overall is the U-factor (the overall heat transfer coefficient) of the window, and A window is the window area which is determined to be 2 m 2.16 m) 8 . m)(1 2 . 1 ( Width Height = = × = window A The U-factors for the three cases can be determined directly from Table 9-6 to be 5.57, 2.86, and 1.46 The U-factors for the three cases can be determined directly from Table 9-6 to be 5....
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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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