Forum discussion
NC-2009 EAp2: Minimum Energy Performance
The fan power calculated by the formula presented in APPENDIX G3.1.2.9 of ASHREA90.1-2007 is the sum of all the fan power including supply fan,returen fan,exaust/relief fan.
However,in the simulation program eQuest,the fan power should be input individually by the means of "kw/cfm" or "pressure and efficiency".So the fan power input in eQuest cannot according the formula presented in APPENDIX G3.1.2.9 perfectly.Does USGBC accept the result calculated by the simulation program?
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
March 14, 2011 - 9:04 am
eQUEST can calculate this perfectly. You will need to do a modeling run to size the supply CFM according the G3.1.2.8. Using those results the fan power is calculated for each system according to G3.1.2.9 (CFM comes from SV-A DOE2 report). Assuming all CFM is being applied to a supply fan, divide the kW by the CFM and use that as your eQUEST input.
This is a bit of a simplification but hopefully it will get you started.