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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)?


What should I do about a warehouse space?

How can thermal conditions for areas with metabolic rates outside of 1.0–1.3 be determined? (Per ASHRAE Standard 55-2004 Section 5.2.1.1, Figure 5.2.1.1 can be used for areas with metabolic rates between 1.0 and 1.3).

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

Floor Diffusers

I'm looking for clarification on how to handle air speed for floor diffusers at the perimeter of a large lobby space. At these locations the air speed will be high but the majority of the lobby space and where most occupants are will be low velocity. Should the air velocity be based more on this area w/ most traffic/occupants rather than at the perimeter? Also, there are large amounts of glazing and not sure if calculation of mean radiant temperature is typically required in such cases?

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Scott Bowman
LEED Fellow
Integrated Design + Energy Advisors, LLC
LEEDuser Expert
377 thumbs up

Fri, 11/28/2014 - 02:30

In lobbies it is often quite difficult to specify where people will be. I would position them in the most typical positions for the evaluation. This will then allow you to determine the velocity of the air where they are. Radiant mean temperature is absolutely required, which is why you have most likely positioned the diffusers to be at the perimeter. So, you will have to evaluate that issue, and air is often difficult to provide this comfort. We have seen radiant floors used in heating climates to great affect in these kinds of spaces where more conventional radiation would not be allowed for aesthetic reasons. While I have not gotten to do this myself, I think the same floor tubing could be used to provide a cool slab in summer too, but you have to be very careful to control the temperature to stay above the dew point of the air. I have heard of this working in coordination with the air quite well, just not on a project that I have been directly involved with.

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