Maurice Tutor

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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 09 Jul 2017 My Price 11.00

wood-frame house

An exterior wall of a wood-frame house is typically composed, from outside to inside, of a layer of wooden siding, a layer glass fiber insulation, and a layer of gypsum wall board. Standard glass fiber insulation has a thickness of 3.5 inch and a conductivity of 0.038 W/m·K. Gypsum wall board is normally 0.50 inch thick with a conductivity of 0.17 W/m·K, and the siding can be assumed to be 1.0 inch thick with a conductivity of 0.10 W/m·K.

a. Find the overall thermal resistance of such a wall (in K/W) if it has an area of 400 ft2.

b. Convection and radiation processes on the inside and outside of the wall introduce more thermal resistance. Assuming that the effective outside heat transfer coefficient (accounting for both convection and radiation) is = 20 W/m2K and that for the inside is i = 10 W/m2K, determine the total thermal resistance for heat loss from the indoors to the outdoors. Also obtain an overall heat transfer coefficient, U, in W/m2K.

c. If the interior temperature is 20◦C and the outdoor temperature is −5◦C, find the heat loss through the wall in watts and the heat flux in W/m2.

d. Which of the five thermal resistances is dominant?

Answers

Maurice Tutor
(5)
Status NEW Posted 09 Jul 2017 09:07 PM My Price 11.00

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