Hi all,
I am trying to set up a model to which uses minimum ASHRAE 62.1 ventilation
rates and I'm having a bit of trouble. My understanding is that in the zone
setup the outdoor air can be setup to use 4 different specification methods,
but equest will only use whichever is greatest (ie, 5cfm/person or .06
cfm/sqft) but not combine them. It therefore seems like the best method for
this is to use 62.1 to calculate cfm/zone and just enter that number.
I then go to my system screen for OA, where I can specify the OA ratio,
control method, etc. If I set the ratio to be 1, and the sizing method to
be Sum of Zone OA , then when I go to the SV-A report shouldn't my numbers
there match exactly what I have entered for all my design values? I set up
a very simple zone that had 100 cfm design flow, 50 cfm min OA, and 50 cfm
exhaust, and then when I run a simulation and open the SV-A report it lists
my design cfm as 103, OA as 52, and exhaust as 53. I don't understand why
these design values are slightly higher, anyone have any thoughts?
____________________________
Michael Shields, EIT
Facility Strategies Group, LLC
1012 Market Street, Suite 307
Fort Mill, SC 29708
Phone: 803-493-4507
Fax: 803-548-2511
Email:
Go into your Project and Site tab and set your altitude to 0. For an
explanation of this search the archives.
Thanks Carol, that was indeed what was causing the difference. It looks
like I missed a fairly lengthy discussion that was previously held on the
list when trying to figure it out.
Michael