[BLDG-SIM] I've got a GOOD eQuest question..

[Lynn Qualmann]

John -
 
It sounds like the plenums are associated with the systems serving the
respective floor areas (the eQuest default as far as I can tell). If you
look down the page, all the parameters associated with the plenum zones
(SUPPLY FLOW, EXHAUST FLOW, etc) should be zero, so they aren't
affecting the energy consumption of the system. I am assuming you
divided the building into two equal-area wings, so adding the true floor
area and the associated plenum's area coincides with the building's
total floor area. I don't think there is any problem with removing the
plenum zones from the existing systems and associating them with a new
system (SYSTEM-TYPE = SUM). My understanding is that this system type
doesn't address any loads but is used for diagnostics. Then the square
footage for your systems should be the expected 40,000 sqft each in
SV-A. Hope this halps.
R. Lynn Qualmann, P.E. 
SBW Consulting, Inc. 
2820 Northup Way    #230 
Bellevue,  WA      98004 
Phone:      (425) 827-0330 
Fax:          (425) 822-8119 
e-mail:       rlq at sbwconsulting.com 


  _____  

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Aulbach,
John
Sent: Wednesday, February 21, 2007 6:47 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] I've got a GOOD eQuest question..


I simulated an 80,000 sq.ft building, a two wing, three story building.
Each three story wing is to have it's own fan system (ASHRAE-90.1-2004
requires it to be Package VAV). So I set it up this way, and
successfully ran the model.
 
The Ls-C output, I am told, is the only place in the model where the
conditioned sq.ft is shown. 80,000 sq.ft, lo and behold.
 
But THEN I went to SV-A, two of them one for each fan system. BOTH of
the sq.ft shown on were 80,000 sq.ft
 
The DOE-2 help for DOE-2.2/eQuest says the following for the SV-A report
(and I quote):
------------------------------------------------------------------------
------------------------------------------------------------------------
----------------------------
System-Level Design Values

SYSTEM TYPE

is the code-word identifying the type of system.  

ALTITUDE FACTOR

is the altitude adjustment factor for air flows; it multiplies air flows
at sea level to get air flows at the actual altitude of the building.

FLOOR AREA

is the total floor area of all zones served by the system that have
ZONE-TYPE = CONDITIONED or UNCONDITIONED, or, for ZONE-TYPE = PLENUM,
that have non-zero occupancy.

------------------------------------------------------------------------
------------------------------------------------------------------------
-----------------------------------

My plenums are shown as zero occupancy.

So WHY does it seem to be counting them as part of the Floor Area ????

HALP !!

 
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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