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FAQs about IEQc7.1 :

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

Using ASHRAE Figure 5.2.1.1.

On past project we have been told: Please note that Figure 5.2.1.1 can only be used when air speeds are less than 40 feet per minute. We have a project with air speeds at 40 fpm. So does that mean we can't use Figure 5.2.1.1.? Or is it just above 40 fpm? Thanks!

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

Fri, 06/13/2014 - 11:23

The air speed cannot be greater than 40 fpm. This is stated in the third paragraph of Section 5.2.1.1.
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serge sidoroff
Director of Environmental projects
Penicaud Green Building - edeis group
LEEDuser Basic Member
1 thumbs up

Fri, 06/13/2014 - 12:09

No : this § states that the figure 5.2.1.1 does apply when the air speed is below 40fpm. Section 5.2.3 states explicitely that "this standard allows elevated air speed to be used ... under certain conditions", whereas section 5.2.3.1 explains how to deal with these conditions. I encourage you to download the addendum b of the 2007 version or to buy the 2013 version, since all this parts have been deeply updated.

Fri, 06/13/2014 - 19:26

So we can or can't use Figure 5.2.1.1 for air speeds of 40 fpm?
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serge sidoroff
Director of Environmental projects
Penicaud Green Building - edeis group
LEEDuser Basic Member
1 thumbs up

Mon, 06/16/2014 - 10:48

It will depend on the version of the standard you want to use and to the interpretation you will make. Shortly : - 2010 version without addendum b : "figure 5.2.1.1 specifies comfort zone for environments ... and where the air speeds are not greater than 40 fpm" My understanding is that 40 fpm complies with this statement. - 2010 version with addendum b : the statement "and where the air speeds are not greater than 40 fpm" is deleted. - 2013 version : (§5.2.1 becomes §5.3.1) "Average air speed greater than 40 fpm requires the use of section 5.3.3". My understanding is that 40 fpm does not require the use of section 5.3.3 (and therefore allows to use the figure 5.2.1.1, renamed 5.3.1 in the 2013 version) USGBC allows you to use the standard "with errata but without addenda". My opinion is that you can choose to use errata if it is better for you, but then you will have to use all of them (which is rather handsome for the 55.2-2010 ...) or it's more simple to use the 2013 version. I hope it will help

Mon, 06/16/2014 - 15:43

Thank you Serge. Yes I agree sounds like I can use 5.2.1.1 because it does that speeds GREATER then 40fpm and 40 is not greater then 40 :)

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