[BLDG-SIM] Fan Power VAV in eQuest

[Andrew Craig]

Jim---

 

According to a DOE system description I have for the PIU...

 

"The Powered Induction Unit System is identical to the VAVS except that
the PIU system uses local fans in some or all of its variable-air volume
terminal units (usually perimeter zones) to draw secondary air directly
from the return plenum." 

 

So long story short, by selecting the PIU system, you are still modeling
a VAV system, DOE has just named it differently when adding the ability
to include fan-powered boxes.  If anyone out there has contrary
information, please share, as this is a widely accepted method for
modeling fan-powered VAV systems.

 

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 Zarske,
Jim
Sent: Thursday, June 28, 2007 1:27 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Fan Power VAV in eQuest

 

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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