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Unformatted text preview: 0.17 0.17 2. Face brick, 4 in 0.43 0.43 3. Cement mortar, 0.5 in 0.10 0.10 4. Concrete block, 4in 1.51 1.51 5a. Air space, 3/4in, nonreflective 5b. Nominal 1 3 vertical ferring 2.91   0.94 6. Gypsum wallboard, 0.5 in 0.45 0.45 7. Inside surface, still air 0.68 0.68 1 2 3 4 5a 6 7 5b Total unit thermal resistance of each section, R 6.25 4.28 The Ufactor of each section, U = 1/ R , in Btu/h.ft 2 . F 0.160 0.234 Area fraction of each section, f area 0.80 0.20 Overall Ufactor, U = f area,i U i = 0.80 0.160+0.20 0.234 0.175 Btu/h.ft 2 . F Overall unit thermal resistance, R = 1/ U 5.72 h.ft 2 . F/Btu Therefore, the overall unit thermal resistance of the wall is R = 5.72 h.ft 2 . F/Btu and the overall Ufactor is U = 0.118 Btu/h.ft 2 . F. These values account for the effects of the vertical ferring. 397...
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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.
 Fall '10
 Dr.DanielArenas
 Thermodynamics, Resistance, Mass, Heat

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