A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was designed to maintain a set temperature of 6 °C. The bodies consist of two 10-mm-thick layers of Aluminium (k = 225 W/mK) separated by a 30 mm polyurethane insulation (k-0.028 W/mK). If the average convection heat transfer coefficient at the inner and outer surfaces are 11.6 W/m²K and 14.5 W/m2K respectively, calculate: the resistance(R) for the outer fluid thermal layer in K/W to 5 decimal places.

A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was designed to maintain a set temperature of 6 °C. The bodies consist of two 10-mm-thick layers of Aluminium (k = 225 W/mK) separated by a 30 mm polyurethane insulation (k-0.028 W/mK). If the average convection heat transfer coefficient at the inner and outer surfaces are 11.6 W/m²K and 14.5 W/m2K respectively, calculate: the resistance(R) for the outer fluid thermal layer in K/W to 5 decimal places.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.5P

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A domestic refrigerator with inner dimensions of 0,7 m by 0,7 m at the base and height 1m was designed to maintain a set temperature of 6 degrees Celsius. The bodies consist of two 10 mm thick layers of Aluminum (k=225W/mK) separated by a 30 mm polyurethane insulation (k=0,028W/mK). If the average convection heat transfer coefficient at the inner and outer surfaces are 116W/m²K and 14,5W/m²K respectively. Calculate : 1)The individual resistance (R) for each thermal layer, as well as for the refrigerator 2)The steady rate of heat transfer from the interior to maintain the specified temperature in the kitchen at 25 degrees Celsius 3)The outer surface temperature of the Aluminum 4)Sketch the sectional view of the refrigerator showing thermal circuit
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