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ASHRAE-55 comfort criteria ask for space air speed. Is this the same as the supply air volume measured in cubic feet per minute (CFM)?


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There are a few spaces in my project that can’t meet these requirements. Can’t I just exclude them?

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NC-2009 IEQc7.1:Thermal Comfort—Design

Naturally ventilated open cafeteria

Dear all, We have a fully naturally ventilated open cafeteria (No walls, only roof mounted on top of columns) that is occupied only for max about 2 hrs a day during 1hr lunch break and two tea breaks. Do you think we should include this space in thermal comfort documentation or can we exclude it due to very low usage?

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Cam Fitzgerald
Energy Engineer
7group
LEEDuser Basic Member
18 thumbs up

Wed, 08/05/2015 - 11:49

Magda, You are correct that this area may be excluded, but not for the stated reason. As described, the cafeteria is not an interior so ASHRAE 55-2004 does not apply. Section 2.3 states, "This standard specifies thermal environmental conditions...in indoor spaces designed for human occupancy..." I suggest you identify the space as exterior, explain the intended use and occupant expectations for an exterior cafeteria and this should satisfy the intent of the credit as well as the reviewer.

Fri, 08/07/2015 - 04:09

Thank you very much. So how do you define an interior space? Have you come across any standard definition or is it a subjective judgement? For example if we have half walls instead of no walls at all, does that become an interior space? Or if we have 3 sides fully open with no walls and one side has a wall with standard window, is that an interior space or exterior space?
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Cam Fitzgerald
Energy Engineer
7group
LEEDuser Basic Member
18 thumbs up

Fri, 08/07/2015 - 12:31

Each of the ASHRAE standards has a definitions section (Section 3) and typically words defined in this section are italicized. There is no definition for interior or indoor space in either ASHRAE 55 or 62.1, but 90.1 defines a space as a fully y enclosed space. Without walls, the area is not a space. Your description seems to align with what I would call a pavilion (with or without the knee walls) which is definitely exterior space. If there were folding solid doors that could be open, the space would be considered to be interior and you would have to include the space. If the doors were only there for security purposes during unoccupied periods, you could argue that the space is not enclosed when occupied.

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