Question

A certain building wall consists of 6.0 inches of concrete [k = 1.2 W/m · ºC], 2.0 inches of fiberglass insulation, and 3/8 inches of gypsum board [k = 0.05 W/m · ºC]. The inside and outside convection coefficients are 2.0 and 7.0 Btu/h · ft2 · ºF, respectively. The outside air temperature is 20ºF, and the inside temperature is 72ºF. Calculate the overall heat-transfer coefficient for the wall, the R value, and the heat loss per unit area.

Name: a certain building wall consists of 60 in of concrete k 12 wm oc 20 in of fiberglass insulation and 38 in of gypsum board k 005 wm oc the inside and outside convection coefficients are 20 an 93336
Uploaded: 2022-09-26T15:57:29-08:00
Duration: 2 min 57 s
Channel: Animesh Raj
Description: a certain building wall consists of 60 in of concrete k 12 wm oc 20 in of fiberglass insulation and 38 in of gypsum board k 005 wm oc the inside and outside convection coefficients are 20 an 93336

          A certain building wall consists of 6.0 inches of concrete [k = 1.2 W/m · ºC], 2.0 inches of fiberglass insulation, and 3/8 inches of gypsum board [k = 0.05 W/m · ºC]. The inside and outside convection coefficients are 2.0 and 7.0 Btu/h · ft2 · ºF, respectively. The outside air temperature is 20ºF, and the inside temperature is 72ºF. Calculate the overall heat-transfer coefficient for the wall, the R value, and the heat loss per unit area.

Added by John S.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Animesh Raj

09/26/2022

Step 1

1 inch = 0.0254 m 1 Btu/h ∙ ft2 ∙ ºF = 5.678 W/m2 ∙ K So, the thickness of the concrete, fiberglass insulation, and gypsum board are 0.1524 m, 0.0508 m, and 0.9652 m, respectively. The inside and outside convection coefficients are 11.34 W/m2 ∙ K and 39.68 W/m2 Show more…

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A certain building wall consists of 6.0 inches of concrete [k = 1.2 W/m · ºC], 2.0 inches of fiberglass insulation, and 3/8 inches of gypsum board [k = 0.05 W/m · ºC]. The inside and outside convection coefficients are 2.0 and 7.0 Btu/h · ft2 · ºF, respectively. The outside air temperature is 20ºF, and the inside temperature is 72ºF. Calculate the overall heat-transfer coefficient for the wall, the R value, and the heat loss per unit area.