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Our project has a large process load—75%. Despite our efforts to make an efficient HVAC design, the cost savings are minimal. What can we do to earn this prerequisite and be eligible for LEED certification? Is there any flexibility in how we model the p

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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Crawlspace and Attic Classification

I am working on an existing building renovation where there is a significant amount of building floor area that is crawlspace and attic area. I am completing the v4 Minimum Energy Performance Calculator (latest Excel Table 1.4 version) as a requirement of applying LEED Interpretation 10421. In this Excel form, there are spaces to input the Conditioned building area square footage and the Unconditioned building area square footage. By following the definitions in ASHRAE 90.1, I am confused on how to classify the crawlspace and attic area as either conditioned or unconditioned. The ASHRAE 90.1 definition of an unconditioned space is an enclosed space within a building that is not a conditioned space or a semi heated space. Crawlspaces, attics, and parking garages with natural or mechanical ventilation are not considered enclosed spaces. Ventilation is further defined as the process of supplying or removing air by natural or mechanical means to or from any space. Such air is not required to have been conditioned. The crawlspaces and attics in this project both have ventilation by the above definition. There is a small amount of heating capacity designed for these spaces, enough to be considered semi-heated (>3.4 Btu/h-ft2), except that by above definitions the attic and crawlspace are not considered enclosed. Does anyone have any advice on how to classify these spaces?

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Fri, 06/16/2017 - 07:26

1) All energy uses must be accounted for, regardless (that means fans, heaters, etc.). 2) crawlspaces are considered "not enclosed". therefore they cannot be considered an unconditioned space. Infact, if you see the definition of a "space", then they are not considered "spaces". This makes sense, if you think about it. The cold ventilated attic in my house is seperated from the rooms below by the thermal/moisture-retarder/air barrier and is considered outside the thermal envelope. There may be spaces wrapped with in the volume of the building that are "outside" the envelope. That is they lay geometrically within the volume, but there definition seperates them from the volume.

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