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NC-2009 EAp2:Minimum Energy Performance

Part of HVAC considered as Process for clean rooms?

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Valentin Grimaud
Thermal Engineer
TERAO Green Building Engineering
LEEDuser Basic Member
28 thumbs up

Dear community, My project includes extraordinary energy consumption for HVAC resulting from maintaining clean room environments – specifically the amount of air changes and pressure requirements which must be maintained in order to comply with ISO standards. We can see that the exception G3.1.1c especially deals with extraordinary energy consumption for HVAC resulting from maintaining clean room environments. Besides, I was told that we could claim a portion of the HVAC load as “process loads”. Process loads must be equal in baseline and proposed cases, so this would apply for this portion of the HVAC loads. I'm not sure this can really be, since this would conflict with the exception G3.1.1c. Does anyone have any clues about it? Thank you for your clarifications,

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

Thu, 02/28/2013 - 15:21

It would not conflict with G3.1.1c as far as I can tell. G3.1.1c just says that if you have zones with the stated conditions they should be modeled with a separate system in the baseline. It does not have anything to do with the level of energy consumption it has to do with separating these zones in your baseline. It sounds like your question is how to separate the conditioning associated with the process from the conditioning associated with the needs of the occupants?
Profile picture for user vgrimaud
Valentin Grimaud
Thermal Engineer
TERAO Green Building Engineering
LEEDuser Basic Member
28 thumbs up

Fri, 03/01/2013 - 09:16

Thank you Marcus, Indeed, that is the question that comes if we can consider that there is no conflict. Is there some kind of a method for this separation? thank you for your clarifications
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 03/01/2013 - 19:18

Claiming a portion of the HVAC use as process used to be common in LEED v2.2 since many of these uses were not regulated by 90.1 at all. With the 2007 version and the regulation of many of these uses (labs in particular) this distinction cannot be separated for many uses. The 2010 version added even more uses (like fume hoods). So to determine if you could separate a portion of the HVAC as process you would need to make the case that 90.1 does not currently regulate the situation and then propose a methodology for separating it. So check out the definition of process energy and see if you think your situation applies and if so you could try to propose a methodology.

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