The walls of a refrigerator are typically constructed by sandwiching a layer of insulation between sheet metal panels. Consider a wall made from fiberglassinsulation of thermal conductivity kị = 0.0046 W/m - K and thickness L; = 50 mm and steel panels, each of thermal conductivity kp = 60 W/m - K and thicknessLp = 3 mm. If the wall separates refrigerated air at Ts i= 4°C from ambient air at T,0 = 25°C, what is the heat gain per unit surface area? Coefficientsassociated with natural convection at the inner and outer surfaces may be approximated as h; = h, = 5 W/m² - K.%3D!!%3D

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Answered: The walls of a refrigerator are…

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: the total resistance(R) for the refrigerator in K/W to 4 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 Aluminium near the outer thermal layer in K/W to 8 decimal places this question is from thermodynamics
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 Aluminium near the outer thermal layer in K/W to 8 decimal places.
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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: the resistance(R) for the Aluminium near the outer thermal layer in K/W to 8 decimal places. the resistance(R) for the Aluminium near the inner thermal layer in K/W to 8 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 Aluminium near the inner thermal layer in K/W to 8 decimal places thermodynamic
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It is desired to keep the interior of a refrigerator at 2 °C whose dimensions at the base are 0.8 x 0.8 m and the height is 1.9 m. The walls of the refrigerator are made of two sheets of steel, 0.28 cm thick with 3 cm of fiberglass insulation. The interior and exterior coefficients are, respectively, 10 W/m^2 °C and 15 W/m^2 °C. If the ambient temperature in the kitchen is 30°C, estimate the heat flux that must be extracted to maintain the specified conditions. Make a proposal to prevent heat from entering the refrigerator.
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