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Unformatted text preview: 2 2 km/h 12 window, km/h 12 window, ° ⋅ = ° ⋅ = = U R Noting that all thermal resistances are in series, the thermal resistance of the window for 24 km/h winds is determined by replacing the convection resistance for 12 km/h winds by the one for 24 km/h: C/W m 347 . 029 . 044 . 362 . 2 km/h 24 o, km/h 12 o, km/h 12 window, km/h 24 window, ° ⋅ = + − = + − = R R R R Then the Ufactor for the case of 24 km/h winds becomes C W/m 2.88 2 ° ⋅ = ° ⋅ = = C/W m 347 . 1 1 2 km/h 24 window, km/h 24 window, R U Discussion Note that doubling of the wind velocity increases the Ufactor only slightly ( about 4%) from 2.76 to 2.88 W/m 2 . ° C. 982...
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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.
 Fall '10
 Dr.DanielArenas
 Thermodynamics, Convection, Mass

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