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!

James Hansen, P.E., LEED AP