[Equest-users] PVAVS System Terminal Box Fans

[Dahlstrom, Aaron]

Omar:

You've got me double-checking my ASHRAE 90.1-07!

There is no call in Table G3.1.1B for system 5 to have fan powered terminal units.
Also, section G3.1.3.4 only provides instructions for fan powered terminal units for systems 6 and 8.
So I would say you should omit fan powered boxes from System 5.

Where we have fan powered boxes - either in the design, or in baseline system 6/8, we typically model with a PIU system. It sounds like you want a packaged system - the default is for PIU to have chilled water, but you can change the cooling-source to DX and spec an air- or water-cooled condenser, once you've created the system.

The power (and type) of the terminal unit fans is actually specified at the zone level. I've attached the section of the DOE-2 dictionary that explains how this works. See sections "terminal-type" and "zone fans".

Aaron

Aaron Dahlstrom , PE, LEED® AP
In Posse - A subsidiary of AKF| 1500 Walnut Street, Suite 1414, Philadelphia, PA 19102 
d: 215-282-6753| m: 267-507-5470| In Posse: 215-282-6800| AKF: 215-735-7290
e: ADahlstrom at in-posse.com | in posse web: www.in-posse.com | akf web: www.akfgroup.com

-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Ömer Moltay
Sent: Friday, January 21, 2011 11:03 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] PVAVS System Terminal Box Fans

Hello,

Does eQuest model PVAVS systems with fan powered terminal boxes? If so, 
how do you specify the power of these fans?

Additionally, in case of Appendix G modelling for LEED, is one supposed 
to model System 5 with fan powered boxes or not?

Thank you,

Omer Moltay, LEED AP
Mimta


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