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NC-2009 EAc1:Optimize Energy Performance

Appendix G, ASHRAE-90.1-2007

For HVAC System in Baseline case of modelling, it says: "Operate fan contiuously when spaces are occupied and cycle it during unoccupied hours". What might the phrase "cycle it" mean in context of creating a baseline case? Thanks

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Thu, 05/24/2012 - 20:26

Basically the fan is in "auto" mode. The fan cycles on and off with the call for heating or cooling instead of running continuously.

Fri, 05/25/2012 - 19:04

That means even if some spaces are unoccupied, some set temperature has to be maintained, but since there is no load, fans would cycle to maintain the temperature. Thanks.
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 05/25/2012 - 19:34

You got it!

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