[BLDG-SIM] Fan Power VAV in eQuest

[Zarske, Jim]

Andrew,

We're trying to model fan powered VAV boxes with the System Type: VAV.
It appears if you select the system type to be PIU, these terminal unit
inputs work correctly.  

With the VAV system type, one call still select a Series or Parallel Fan
PIU, however the inputs for CFM, kW/CFM, and Zone Fan Ratio were staying
grayed.  So, unless there's default energy affiliated with the PIU
Series or Parallel selections, we couldn't find a way to input the
energy use for each box.  

Does anyone know a way around this issue trying to stick with a VAV
system type?

Jim

-----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Andrew
Craig
Sent: Thursday, June 28, 2007 1:52 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Fan Power VAV in eQuest

John---

We have been modeling fan-powered VAV by selecting the Powered Induction
Unit (PIU) for the main system.  The DOE 2.2 Topics Manual says that
this system is an extension of the standard VAV system and allows you to
specify series (air pulled from primary and secondary air streams) or
parallel (air pulled only from secondary) boxes.  We typically will
model a Fan-powered VAV system with ECM motors and then can adjust the
box's kW/cfm to take credit for the ECM motor performance.  Hope that
helps.

Regards,

Andrew Craig, EIT, LEED(r) AP | Mechanical Designer INTERFACE
ENGINEERING
708 SW Third Avenue | Suite 400 | Portland, OR 97204
direct: 503.382.2696
office: 503.382.2266
fax: 503.382.2262
email: Andrew_C at ieice.com
web: www.ieice.com
Consultants of Choice to the Built Environment for over 35 years
Kirkland, WA | Portland, OR | Sacramento, CA | Salem, OR | SanFrancisco,
CA -----Original Message-----
From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Aulbach,
John
Sent: Thursday, June 28, 2007 12:20 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Fan Power VAV in eQuest

All:

We have a question of how to model Fan Powered VAV in eQuest. I cannot
find the answer off hand.

But I SWEAR you could do it in DOE-2.1E.

Comments?

John R. Aulbach, PE, CEM
Project Manager
Nexant, Inc.
100 North Barranca, Suite 820
West Covina, CA 91791 USA
Phone: 626-430-9054
Fax: 626-430-9060
email: jaulbach at nexant.com
 

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