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16-32E An engineer who is working on the heat transfer analysis of a house in English units needs the convection heat transfer coefficient on the outer surface of the house. But the only value he can find from his handbooks is 22 W/m².K, which is in SI units. The engineer does not have a direct conversion factor between the two unit systems for the convection heat transfer coefficient. Using the conver- sion factors between W and Btu/h, m and ft, and °C and °F, express the given convection heat transfer coefficient in Btu/h ft².°F. Answer: 3.87 Btu/h.ft².°F 16-33 Air at 20°C with a convection heat transfer coeffi- cient of 20 W/m² K blows over a pond. The surface tempera- ture of the pond is at 40°C. Determine the heat flux between the surface of the pond and the air.

16-32E An engineer who is working on the heat transfer analysis of a house in English units needs the convection heat transfer coefficient on the outer surface of the house. But the only value he can find from his handbooks is 22 W/m².K, which is in SI units. The engineer does not have a direct conversion factor between the two unit systems for the convection heat transfer coefficient. Using the conver- sion factors between W and Btu/h, m and ft, and °C and °F, express the given convection heat transfer coefficient in Btu/h ft².°F. Answer: 3.87 Btu/h.ft².°F 16-33 Air at 20°C with a convection heat transfer coeffi- cient of 20 W/m² K blows over a pond. The surface tempera- ture of the pond is at 40°C. Determine the heat flux between the surface of the pond and the air.

Elements Of Electromagnetics
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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16-32E An engineer who is working on the heat transfer analysis of a house in English units needs the convection heat transfer coefficient on the outer surface of the house. But the only value he can find from his handbooks is 22 W/m².K, which is in SI units. The engineer does not have a direct conversion factor between the two unit systems for the convection heat transfer coefficient. Using the conver- sion factors between W and Btu/h, m and ft, and °℃ and °F, express the given convection heat transfer coefficient in Btu/h ft².°F. Answer: 3.87 Btu/h.ft².°F 16-33 Air at 20°C with a convection heat transfer coeffi- cient of 20 W/m² K blows over a pond. The surface tempera- ture of the pond is at 40°C. Determine the heat flux between the surface of the pond and the air. 16-34 Four power transistors, each dissipating 12 W, are mounted on a thin vertical aluminum plate 22 cm x 22 cm in size. The heat generated by the transistors is to be dissipated by both surfaces of the plate to the surrounding air at 25°C, which is blown over the plate by a fan. The entire plate can be assumed to be nearly isothermal, and the exposed surface area of the transistor can be taken to be equal to its base area. If the average convection heat transfer coefficient is 25 W/m².K, determine the temperature of the aluminum plate. Disregard any radiation effects.
Transcribed Image Text:16-32E An engineer who is working on the heat transfer analysis of a house in English units needs the convection heat transfer coefficient on the outer surface of the house. But the only value he can find from his handbooks is 22 W/m².K, which is in SI units. The engineer does not have a direct conversion factor between the two unit systems for the convection heat transfer coefficient. Using the conver- sion factors between W and Btu/h, m and ft, and °℃ and °F, express the given convection heat transfer coefficient in Btu/h ft².°F. Answer: 3.87 Btu/h.ft².°F 16-33 Air at 20°C with a convection heat transfer coeffi- cient of 20 W/m² K blows over a pond. The surface tempera- ture of the pond is at 40°C. Determine the heat flux between the surface of the pond and the air. 16-34 Four power transistors, each dissipating 12 W, are mounted on a thin vertical aluminum plate 22 cm x 22 cm in size. The heat generated by the transistors is to be dissipated by both surfaces of the plate to the surrounding air at 25°C, which is blown over the plate by a fan. The entire plate can be assumed to be nearly isothermal, and the exposed surface area of the transistor can be taken to be equal to its base area. If the average convection heat transfer coefficient is 25 W/m².K, determine the temperature of the aluminum plate. Disregard any radiation effects.
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