A vertical array of circuit boards of 150-mm height is to be air cooled such that the
Question:
A vertical array of circuit boards of 150-mm height is to be air cooled such that the board temperature does not exceed 60°C when the ambient temperature is 25°C.
Assuming isothermal surface conditions, determine the allowable electrical power dissipation per board for the cooling arrangements:
(a) Free convection only (no forced airflow).
(b) Airflow with a downward velocity of 0.6 m/s.
(c) Airflow with an upward velocity of 0.3 m/s.
(d) Airflow with a velocity (upward or downward) of 5 m/s.
Transcribed Image Text:
Air flow, (b) (c) 150 mm T, Board Quiescent air, T. (a)
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Related Book For
Fundamentals of Heat and Mass Transfer
ISBN: 978-0471457282
6th Edition
Authors: Incropera, Dewitt, Bergman, Lavine
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