[Equest-users] Supply airflow sizing

Uday Gorre u_k_gorre at ateindia.com
Tue Jun 12 04:17:18 PDT 2012


Hi,

You don't need to add Outside air to supply air flow . 

Supply air flow= outside air+ return air 

But your outside air is more than supply air flow ( I hope this calculation
you check).

Uday.....


-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Turner,
Erik
Sent: 12 June 2012 12:46 Amour 
To: equest-users at lists.onebuilding.org
Cc: SEA Admin1
Subject: [Equest-users] Supply airflow sizing

Is there a place in the documentation that details how eQuest calculates
supply airflows? I'm modeling a VAVS system, and it seems the MIN-SUPPLY-T
for cooling and MAX-SUPPLY-T for heating are used to arrive at cooling and
heating CFMs, and the larger of the two is applied as the airflow to that
space (plus OSA I'd imagine).

I have a space that has a cooling load of 108kBTUh and a heating load of
-36kBTUh. I've done a handcalc (Q=1.8*cfm*deltaT) to arrive at the
following:


Cooling: (supply at 55, space temp at 75) -->3000cfm
Heating: (supply at 95, space temp at 72) -->870 cfm

OSA requirement is 4200cfm.

By hand, I calculate a value of around 7200cfm. However the value listed as
supply flow in the SV-A is 71225cfm, about an order of magnitude larger than
what my hand calc suggests.

Am I thinking about something incorrectly here, or can anyone point me in
the direction to find documentation on how eQuest calculates airflows so I
can try and troubleshoot the inputs that would affect the answer? 

Thanks,
Erik




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