Glass fiber blanket Plaster board, k, - Plywood siding, k, Outside Inside h, T h, T , = -10°C = 20°C 11 90 mm Sms Figure 3: Composition of the wall layers and the insulation layer.
Project 3:
It is vital to optimize the heat loss from a house through well designed composition and proper selection of the insulation layer of the wall layers. Your role as a thermal power engineer to investigate the heat transfer performance of a composite walls. Your head of department asked you to analyze the composite walls structure in Figure.3 and determine the steady rate of heat transfer and total heat loss, if the following design specifications must be met:
_Indoor room temperature must be maintained at 20??.
− Outdoor temperature mostly is -10?? in a hard winter.
− Wall is made of plywood with thermal conductivity constant of ?? = 0.115 ?/(?.?) .
− Fiberglass insulation is used with thermal conductivity constant of ?? = 0.045 ?/(?.?) .
− Plaster board is used as inner layer for decoration purpose with thermal conductivity constant of ?? = 0.27 ?/(?.?) .
− Convection heat transfer coefficients for indoor and outdoor are ℎ?? = 34 ?/(?2.?) and ℎ?? = 65 ?/(?2.?) , respectively.
− Total wall surface area is 270 ?2
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