HVAC · Systems-and-Components · Problem 5PDFSolution in PDF ↓
HVAC · Systems-and-Components · Problem 5
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OH 65: HVAC: Systems and Components-5
Q: For Systems and Components 5, I used the pressure drop equation for water in circular pipes rather than the Hazen-Williams chart — is the Hazen-Williams coefficient (C) just another name for surface roughness?
A: Not exactly — Hazen-Williams C is an empirical pipe roughness coefficient specific to the Hazen-Williams formula, not the same as the Darcy-Weisbach friction factor or absolute roughness. For pipe sizes and flow rates not easily read from the chart, using the equation with C is a completely valid exam approach.