An array of power transistors, dissipating 6W of power each, are to be cooled by mounting them on a 25cm x 25xm square aluminum plate and blowing air at 35o over the plate with a fan at a velocity of 4m/s. The average temperature of the plate is not to exceed 65oC. 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 the plate. Hint 1: This is a flat plate question. DO NOT treat the transistors as a tube bank. How much heat is dissipated across the flat side of the plate (opposite the side the transistors are mounted on). Hint 2: Use the average Reynold’s and Nusselt numbers
An array of power transistors, dissipating 6W of power each, are to be cooled by mounting them on a 25cm x 25xm square aluminum plate and blowing air at 35o over the plate with a fan at a velocity of 4m/s. The average temperature of the plate is not to exceed 65oC. 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 the plate. Hint 1: This is a flat plate question. DO NOT treat the transistors as a tube bank. How much heat is dissipated across the flat side of the plate (opposite the side the transistors are mounted on). Hint 2: Use the average Reynold’s and Nusselt numbers
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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An array of power transistors, dissipating 6W of power each, are to be cooled by mounting them on a 25cm x 25xm square aluminum plate and blowing air at 35o over the plate with a fan at a velocity of 4m/s. The average temperature of the plate is not to exceed 65oC. 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 the plate.
Hint 1: This is a flat plate question. DO NOT treat the transistors as a tube bank. How much heat is dissipated across the flat side of the plate (opposite the side the transistors are mounted on).
Hint 2: Use the average Reynold’s and Nusselt numbers
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