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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

question about set of fan power in simulation program

lin wang

LEEDuser Basic Member

4 thumbs up

March 14, 2011

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 Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Mon, 03/14/2011 - 13:04

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.

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