[Bldg-sim] 90.1 G3.1.3.13 and eQuest

[James Hansen]

Hi everyone,

 

I wanted to do a gut check of whether I'm interpreting ASHRAE 90.1-2007
Section G3.1.3.13 correctly.

 

That section says:

 

G3.1.3.13     VAV Minimum Flow Setpoints (Systems 5 and 7). Minimum
volume setpoints for VAV reheat boxes shall be 0.4 cfm/ft2 of floor area
served or the minimum ventilation rate, whichever is larger.

 

I have a number of System 5s for a warehouse facility with very low
heating/cooling loads.

 

If I set the minimum flow for all zones to 0.4 in this screen, it ends
up substantially over-supplying the baseline zones.

 

 

 

Since there are maximum cooling supply temperatures (60 degrees), I end
up overcooling the zones even at minimum load, so there is reheat.
There is also cooling energy to get the supply temps down to 60.

 

Am I doing anything "wrong"?

 

I seem to be following the requirements of 90.1, just want to make sure
there isn't an exception somewhere that I'm missing.

 

Thanks!

 

GHT Limited
James Hansen, P.E., LEED AP
Senior Associate
1010 N. Glebe Road, Suite 200
Arlington, VA  22201-4749
703-243-1200 (office)

703-338-5754 (cell)
703-276-1376 (fax)

www.ghtltd.com <http://www.ghtltd.com/> 

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20130708/ced9029a/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/png
Size: 129931 bytes
Desc: image001.png
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20130708/ced9029a/attachment.png>