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Thermodynamics: An Engineering Approach | 8th Edition | ISBN: 9780073398174 | Authors: Yunus A. Cengel
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Solved: The 60-W fan of a central heating system is to

Chapter 2, Problem 249

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QUESTION:

The 60-W fan of a central heating system is to circulate air through the ducts. The analysis of the flow shows that the fan needs to raise the pressure of air by 50 Pa to maintain flow. The fan is located in a horizontal flow section whose diameter is 30 cm at both the inlet and the outlet. Determine the highest possible average flow velocity in the duct.

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QUESTION:

The 60-W fan of a central heating system is to circulate air through the ducts. The analysis of the flow shows that the fan needs to raise the pressure of air by 50 Pa to maintain flow. The fan is located in a horizontal flow section whose diameter is 30 cm at both the inlet and the outlet. Determine the highest possible average flow velocity in the duct.

ANSWER:

Step 1 of 4

The fan of a central heating system circulates air through the ducts.

 For a specified pressure rise, the highest possible average flow velocity is to be determined.

Assumptions are

1. The fan operates steadily.

2. The changes in kinetic and potential energies across the fan are negligible.

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