Thermodynamics HW Solutions 260

Thermodynamics HW Solutions 260 - Chapter 3 Steady Heat...

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Chapter 3 Steady Heat Conduction Properties The R-values at the outer surface of a wall for summer (7.5 mph winds) and winter (15 mph winds) conditions are given in Table 3-6 to be Inside Outside 7.5 mph WALL R o, 7.5 mph = R o, summer = 0.25 h.ft 2 . ° F/Btu and R o, 15 mph = R o, winter = 0.17 h.ft 2 . ° F/Btu Analysis The R -value of the wall at 7.5 mph winds (summer) is RU wall, 7.5 mph wall, 7.5 mph 2 h.ft F / Btu == = ° 11 0 0 9 1 1 1 1 // . . Noting that the added and removed thermal resistances are in series, the overall R- value of the wall at 15 mph (winter) conditions is obtained by replacing the summer value of outer convection resistance by the
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This note was uploaded on 01/19/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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