Hi, I'm modeling a building (not residential),for EAc1, located in climate zone 6 (winter design temperature 5°F). Proposed building envelope is high insulated, thus heating system capacity for floor area for every space is below heated Space Criteria of table 3.1 of ASHRAE 90.1-2007. There's no cooling system designed and so I would consider all spaces as "semiheated space", as ASHRAE definitions.
Does Baseline thermal Envelope should match requirement for "Semiheated space" in table 5.5-6?
Table G3.1.1 indicate that "all conditioned spaces in the proposed building should be both heated and cooled...". In my opinion this can't be applied
and proposed space areas should modeled as (semi)heated as baseline spaces too.
In your opinion is it correct?
Thank's a lot for helping
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5906 thumbs up
March 9, 2011 - 2:32 pm
Hi Alberto,
Yes if you are between 3.4 and 20 BTU/h-ft2 on heating and if the cooling is less than 5 BTU/h-ft2, the space is semi-heated and you use the semi-heated envelope requirements for that climate zone in the baseline building.
Table G3.1.1(b) states that the proposed must include heating and cooling in all "conditioned" space. Semi-heated is not a conditioned space according to the definitions. Therefore a cooling system would not need to be modeled.
So I think we feel like your opinion is correct!