Forum discussion
NC-2009 EAp2: Minimum Energy Performance
We are working a factory which has a small freezer room of 200 sf. How should we model this part? Can we just model the freezer room as a fixed process load (no actual cooling equipement similar to a refrigerator load)? Or do we have to model the HVAC system for this room with the set point of -20F?
if the latter case is correct, can we use the standard ASHRAE 90.1 for the baseline of envelope and HVAC inputs?
thanks
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
5909 thumbs up
January 21, 2013 - 12:47 pm
Model it as a small freezer similar to a walk-in refrigerator at a lower temperature. It will have a compressor, etc. Model it identically in the baseline. Do not model it as HVAC system. Baseline values from LEED for Retail could be used.
Jatuwat Varodompun
DrGreen Building Soultion
26 thumbs up
January 21, 2013 - 6:59 pm
Thanks Marcus. Let say the compressor is 10 kW and the fan is 1 kW. The setup would be 11kW for this room and the schedule would be 24 hours with 60% of average power operation. This will be identical in both baseline and proposed. Am i correct?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
January 22, 2013 - 9:26 am
The identical part is correct. Not sure I know enough to say if the modeling input is correct.
Jatuwat Varodompun
DrGreen Building Soultion
26 thumbs up
January 22, 2013 - 10:55 am
Thanks Marcus. I will try this approach and see the review result.
HOUCINE TLEMSANI
Mechanical DesignerMEP Engineering Solutions, Inc
14 thumbs up
January 29, 2013 - 4:37 pm
i think that ASHRAE Fundamentals give you a usage factor that you can apply to the freezer.