[Equest-users] Outside Air Supply

[M. Shields]

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:  <mailto:mshields at fstrategies.com> mshields at fstrategies.com

 

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