A fan is to be selected to cool a computer case whose dimensions are 12 cm x 40 cm x 40 cm (Fig. 12-33). Half of the volume in the case is expected to be filled with components and the other half to be air space. A 5-cm- diameter hole is available at the back of the case for the installation of the fan that is to replace the air in the void spaces of the case once every second. Small low-power fan-motor combined units are available in the market and their efficiency is estimated to be 30 percent. Determine (a) the wattage of the fan-motor unit to be purchased and (b) the pressure difference across the fan. Take the air density to be 1.20 kg/m2. Streamline Welect V2 Fan Casing
A fan is to be selected to cool a computer case whose dimensions are 12 cm x 40 cm x 40 cm (Fig. 12-33). Half of the volume in the case is expected to be filled with components and the other half to be air space. A 5-cm- diameter hole is available at the back of the case for the installation of the fan that is to replace the air in the void spaces of the case once every second. Small low-power fan-motor combined units are available in the market and their efficiency is estimated to be 30 percent. Determine (a) the wattage of the fan-motor unit to be purchased and (b) the pressure difference across the fan. Take the air density to be 1.20 kg/m2. Streamline Welect V2 Fan Casing
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:A fan is to be selected to cool a computer case whose dimensions are 12 cm
x 40 cm x 40 cm (Fig. 12-33). Half of the volume in the case is expected
to be filled with components and the other half to be air space. A 5-cm-
diameter hole is available at the back of the case for the installation of the
fan that is to replace the air in the void spaces of the case once every second.
Small low-power fan-motor combined units are available in the market and
their efficiency is estimated to be 30 percent. Determine (a) the wattage of the
fan-motor unit to be purchased and (b) the pressure difference across
the fan. Take the air density to be 1.20 kg/m3.
Streamline
Welect
V2
Fan
Casing
30
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