The wall of a refrigerator is constructed of fiberglassinsulation (k = 0.035 W/m·K) sandwiched between two layersof 1-mm-thick sheet metal (k = 15.1 W/m·K). The refrigeratedspace is maintained at 3°C, and the average heat transfercoefficients at the inner and outer surfaces of the wall are4 W/m2·K and 9 W/m2·K, respectively. The kitchen temperatureaverages 25°C. It is observed that condensation occurson the outer surfaces of the refrigerator when the temperatureof the outer surface drops to 20°C. Determine the minimumthickness of fiberglass insulation that needs to be used in thewall in order to avoid condensation on the outer surfaces.
The wall of a refrigerator is constructed of fiberglassinsulation (k = 0.035 W/m·K) sandwiched between two layersof 1-mm-thick sheet metal (k = 15.1 W/m·K). The refrigeratedspace is maintained at 3°C, and the average heat transfercoefficients at the inner and outer surfaces of the wall are4 W/m2·K and 9 W/m2·K, respectively. The kitchen temperatureaverages 25°C. It is observed that condensation occurson the outer surfaces of the refrigerator when the temperatureof the outer surface drops to 20°C. Determine the minimumthickness of fiberglass insulation that needs to be used in thewall in order to avoid condensation on the outer surfaces.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
The wall of a refrigerator is constructed of fiberglass
insulation (k = 0.035 W/m·K) sandwiched between two layers
of 1-mm-thick sheet metal (k = 15.1 W/m·K). The refrigerated
space is maintained at 3°C, and the average heat transfer
coefficients at the inner and outer surfaces of the wall are
4 W/m2·K and 9 W/m2·K, respectively. The kitchen temperature
averages 25°C. It is observed that condensation occurs
on the outer surfaces of the refrigerator when the temperature
of the outer surface drops to 20°C. Determine the minimum
thickness of fiberglass insulation that needs to be used in the
wall in order to avoid condensation on the outer surfaces.
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