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NC-2009 EAc1:Optimize Energy Performance

Fan Power Calculation

In base case, how to calculate bhp/cfm value for AHUs if we know flow (in CFM) & cooling capacity (btu/h) details? In Design Case, if we know CFM & Power (normal - in kW), how to calculate bhp/cfm?

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Marcus Sheffer
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Sun, 03/04/2012 - 15:53

There is an Appendix G Fan Power Calculator in the Documentation Toolkit above.

Tue, 03/06/2012 - 11:56

What is the difference between CFMs & CFMd? Please explain.
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Marcus Sheffer
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Tue, 03/06/2012 - 14:18

Refer to Table 6.5.3.1.1A in ASHRAE 90.1. "s" is supply. "d" is design air flow.

Wed, 03/07/2012 - 08:26

Dear Marcus, Thanks for your information. I am only a beginner in modeling. Please let me know how to calculate bhp/cfm for design case if we know design CFM & power requirement (in kW). How to convert to bhp from kW? Is it hp & bhp same?
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Marcus Sheffer
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Wed, 03/07/2012 - 16:14

hp x 746 = watts They are not quite the same. hp is the nominal value and bhp is under actual operating condition.

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