A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height1m 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 polyurethaneinsulation (k=0.028 W/mK). If the average convection heat transfer coefficient at theinner and outer surfaces are 11.6 W/m'K and 14.5 W/m'K respectively, calculate:Data: Hgt =W=L. = L, =m, k= k =L=, Tus=h.=,h =Area=5.1 the individual resistance(R) for each thermal layer, as well as for the total of therefrigerator,Assessor's Signature Moderator's SignaturePage 10 of 345.2 the steady rate of heat transfer from the interior to maintain the specified temperaturein the kitchen at 25 "C, and5.3 the outer surface temperature of the Aluminum.5.4 Sketch the sectional view of the refrigerator showing the thermal circuit.9/34

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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 "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/m K and 14.5 W/m'K respectively, calculate: Data: Hgt= m, k=k, k Area 5.1 the individual resistance(R for each thermal laver, as well as for the total of the refrigerator, Assessor's Signature Moderator's Signature Page 10 of 34 5.2 the steady rate of heat transfer from the interior to maintain the specified temperature in the kitchen at 25 °C, and 5.3 the outer surface temperature of the Aluminum. 5.4 Sketch the sectional view of the refrigerator showing the thermal circuit.

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 "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/m K and 14.5 W/m'K respectively, calculate: Data: Hgt= m, k=k, k Area 5.1 the individual resistance(R for each thermal laver, as well as for the total of the refrigerator, Assessor's Signature Moderator's Signature Page 10 of 34 5.2 the steady rate of heat transfer from the interior to maintain the specified temperature in the kitchen at 25 °C, and 5.3 the outer surface temperature of the Aluminum. 5.4 Sketch the sectional view of the refrigerator showing the thermal circuit.

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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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: Total inner surace area in m2 to 2 decimal places.
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