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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

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.

Jul 24 2020 View more View Less

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