[Equest-users] [Bldg-sim] supply air rate

[Carol Gardner]

Sambhav,

I agree with Varkie here. It is best to work with the design engineer and
ask him/her what cfm/sf he/she is using for the space. It is usually
different for exterior and interior spaces.

I would not suggest doing it at the system level, rather at the zone level.
If you are not working with a design engineer, get yourself some resources
and study up. Supply air is provided to offset loads to space, meet comfort
needs of the occupants and to ensure a healthy environment. Hit and/or miss
energy modeling, i.e., making changes to a model to get rid of hours outside
a throttling range is not what you should be doing, and I know, we all do it
sometimes. Far better, however, to try to figure out why those hours are
there and fix them that way.

Finally, thanks for the elevated status but I am a Ms. Carol.

Best,

Carol

On Fri, Mar 4, 2011 at 8:35 AM, Varkie C Thomas <thomasv at iit.edu> wrote:

> Sabhav,
> The solution is not as simple as increasing the supply cfm/sqft to make the
> unmet hours disappear.  2-3 cfm/sqft in what type of building using what
> type of system?  Do you have an egineering degree?  You need to work with
> experienced engineers on real buildings before you can make decisions like
> this.  I am copying this to Carol in case the message was not intended for
> me.
> Varkie
>
> ----- Original Message -----
> From: sambhav tiwari <tiwari.sambhav at gmail.com>
> Date: Thursday, March 3, 2011 10:53 pm
> Subject: Re: [Bldg-sim] supply air rate
>
> > Hi Mr Carol,
> >                  What i intended to ask was that when unmet hrs come
> > in results then to remove them i try to increase my supply fan cfm
> > which in turn increase supply cfm/sqft so then unmet hrs disappear but
> > my supply fan cfm/sqft  goes up to 2-3cfm/sqft for some zones ,is this
> > range acceptable?
> >
> > Thanks
> > Sambhav
> >
>



-- 
Carol Gardner PE
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