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NC-2009 EAp2:Minimum Energy Performance

cold room and energy sim

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

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

Mon, 01/21/2013 - 17:47

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.

Mon, 01/21/2013 - 23:59

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?
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 01/22/2013 - 14:26

The identical part is correct. Not sure I know enough to say if the modeling input is correct.

Tue, 01/22/2013 - 15:55

Thanks Marcus. I will try this approach and see the review result.
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HOUCINE TLEMSANI
Mechanical Designer
MEP Engineering Solutions, Inc
LEEDuser Basic Member
8 thumbs up

Tue, 01/29/2013 - 21:37

i think that ASHRAE Fundamentals give you a usage factor that you can apply to the freezer.

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