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 2°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 24°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

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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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 2°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 24°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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