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Thermodynamics HW Solutions 75

# Thermodynamics HW Solutions 75 - window and A window is the...

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Chapter 1 Basics of Heat Transfer 1-138 The range of U-factors for windows are given. The range for the rate of heat loss through the window of a house is to be determined. Assumptions 1 Steady operating conditions exist. 2 Heat losses associated with the infiltration of air through the cracks/openings are not considered. Analysis The rate of heat transfer through the window can be determined from ) ( window overall window out in 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
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Unformatted text preview: window, and A window is the window area. Substituting, Maximum heat loss: W 378 = ° − − × ° ⋅ = C )] 8 ( 20 )[ m 8 . 1 C)(1.2 W/m 25 . 6 ( 2 2 max window, Q & Q & Window 20 ° C -8 ° C Minimum heat loss: W 76 = ° − − × ° ⋅ = C )] 8 ( 20 )[ m 8 . 1 C)(1.2 W/m 25 . 1 ( 2 2 min window, Q & Discussion Note that the rate of heat loss through windows of identical size may differ by a factor of 5, depending on how the windows are constructed. 1-75...
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