Forum discussion
CS-2009 EAp2: Minimum Energy Performance
I'm working on a project where the building owner is going to provide several Fan&Coil units, the fan control of these units has 4 different presets of velocity being: super high, high, medium, low. The velocity is controlled automatically and can be over written from the BMS.
Would it be correct to model the fan control as variable speed? since constant volume would not be correct and two speed wouldn't be as accurate as it could behave. Software being used is eQuest. Thanks in advanced!
LEEDuser is supported by our premium members, not by advertisers.
Go premium forTo post a comment, you need to register for a LEEDuser Basic membership (free) or login to your existing profile.
A portion of our building envelope is historic. Can we exclude it from our model?
For an existing building, do I need to rotate the model?
Our process load is higher than 25%. Do we have to justify that?
Our local code references ASHRAE 90.1-2010. Should I use that for my documentation, or 90.1-2007?
Can mezzanines open to floors below be excluded from the energy model?
How do I provide a zip code for an international location?
For a project outside the U.S., how do I determine the climate zone?
For a project outside the U.S., how do I determine the Target Finder score?
Do hotel rooms need automatic light shut-off control?
How commonly are the 90.1 mandatory compliance forms submitted as part of EAp2/EAc1?
The Section 9 space-by-space method does not include residential space types. What should I use?
Can the Passive House Planning Package (PHPP) be used to energy model for LEED?
Which baseline HVAC system do I use if my building has no heating or air conditioning?
Our project has a diesel backup generator. Should we include it in our energy model?
Can SHGC be higher in the proposed than in the baseline model?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5867 thumbs up
August 15, 2018 - 11:01 am
Variable speed would not be accurate either and would not produce a conservative level of savings.
We see three options. You could try to create a custom fan curve which would probably be the most accurate way to do this. You could also come up with a way to create some sort of average fan power/speed between the four setting to create two settings but you might run into unmet load hours. You could also just enter the super high and medium fan power/speed which would produce a conservative level of savings.