A fan-cooled computer contains eight printed circuit boards, each dissipating 10 W of power. The height of the cards is 12 cm and their length is 18 cm. Cooling air is supplied by a 25W fan mounted at the inlet. If the air temperature rise is not to be greater than 10 ° C as it passes through the computer case, determine (a) the air flow rate that the fan must deliver and (b) the fraction of the air temperature rise due to heat generated by the fan and its motor.

A fan-cooled computer contains eight printed circuit boards, each dissipating 10 W of power. The height of the cards is 12 cm and their length is 18 cm. Cooling air is supplied by a 25W fan mounted at the inlet. If the air temperature rise is not to be greater than 10 ° C as it passes through the computer case, determine (a) the air flow rate that the fan must deliver and (b) the fraction of the air temperature rise due to heat generated by the fan and its motor.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter50: Commercial, Packaged Rooftop, Variable Refrigerant Flow, And Variable Air Volume Systems

Section: Chapter Questions

Problem 18RQ: Explain how carbon dioxide levels can be used to estimate the occupancy level in a particular area...

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