[Bldg-sim] Fan formula System 1 & 2 ASHRAE 90.1 - 2007

Jaigath Chandraprakash cjaigath at yahoo.com
Wed Jan 27 05:56:32 PST 2010

Hi All,

Appendix G3.1.2.9 of ASHRAE 90.1-2007 gives the formula for systems 1
& 2:Pfan = CFMs x 0.3where CFMs is the supply fan airflow rate in
cfm and Pfan is in watts. I just noticed that in SI version, the
formula is the same Pfan = CFMs x 0.3 where Pfan is also in watts but
CFMs is in lps. Which is version correct? I have already looked into the erratas and addendum but did not find any corrections.

Thank you all in advance.

Jaigath Chandraprakash

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