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7-34 An array of power transistors, dissipating 5 W of power each, are to be cooled by mounting them on a 25-cm x 25-cm-square aluminum plate and blowing air at 35°C over the plate with a fan at a velocity of 4 m/s. The average temperature of the plate is not to exceed 65°C. Assuming the heat transfer from the back side of the plate to be negligible and disregarding radiation, determine the number of transistors that can be placed on this plate. FIGURE P7-34 Aluminum Power plate transistor, 5 W 35°C 25 cm Air → 4 m/s -65°C 25 cm

7-34 An array of power transistors, dissipating 5 W of power each, are to be cooled by mounting them on a 25-cm x 25-cm-square aluminum plate and blowing air at 35°C over the plate with a fan at a velocity of 4 m/s. The average temperature of the plate is not to exceed 65°C. Assuming the heat transfer from the back side of the plate to be negligible and disregarding radiation, determine the number of transistors that can be placed on this plate. FIGURE P7-34 Aluminum Power plate transistor, 5 W 35°C 25 cm Air → 4 m/s -65°C 25 cm

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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7-34 An array of power transistors, dissipating 5 W of power each, are to be cooled by mounting them on a 25-cm x 25-cm-square aluminum plate and blowing air at 35°C over the plate with a fan at a velocity of 4 m/s. The average temperature of the plate is not to exceed 65°C. Assuming the heat transfer from the back side of the plate to be negligible and disregarding radiation, determine the number of transistors that can be placed on this plate. FIGURE P7-34 Aluminum Power plate transistor, 5 W 35°C 25 cm Air → 4 m/s -65°C 25 cm
Transcribed Image Text:7-34 An array of power transistors, dissipating 5 W of power each, are to be cooled by mounting them on a 25-cm x 25-cm-square aluminum plate and blowing air at 35°C over the plate with a fan at a velocity of 4 m/s. The average temperature of the plate is not to exceed 65°C. Assuming the heat transfer from the back side of the plate to be negligible and disregarding radiation, determine the number of transistors that can be placed on this plate. FIGURE P7-34 Aluminum Power plate transistor, 5 W 35°C 25 cm Air → 4 m/s -65°C 25 cm
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