[BLDG-SIM] Using -999 in Min OA Schedule in eQuest
Mike Tillou
miket at etcgrp.com
Fri Aug 18 07:08:58 PDT 2006
Kendra,
I am not sure how you've got your systems setup but you shouldn't need
to use the Min OA Schedule to force the OA to 100% in the summer. I
have found that the best way to simulate Dir/Ind systems is to use the
keyowrds on the Pre-Conditioner tab under your HVAC system as opposed to
using the DIR/IND System Type (check the DOE 2.2 documentation for the
differences). One of the keywords is EVAP-CLR-AIR which describes the %
of supply air that will pass through the DIR/IND. Set this to 1.0, then
set the keyword DRYBULB-LIMIT to some high value like 130 (default is
120). Anytime the outside air temp is below DRYBULB-LIMIT and above
your SAT the DIR/IND will use 100% OA.
The nice thing about using the DIR/IND on the pre-conditioner tab versus
the DIR/IND system type is you can set up all the keyword variables and
then turn it on and off using a parametric run.
Mike
Michael Tillou, PE
etc Group, Inc.
PO Box 7, Williamstown, MA 01267
ph. (413) 458-9870 fx. (413) 458-9875
-----Original Message-----
From: BLDG-SIM at GARD.COM [mailto:BLDG-SIM at GARD.COM] On Behalf Of
Tupper, Kendra
Sent: Thursday, August 17, 2006 7:24 PM
To: BLDG-SIM at GARD.COM
Subject: [BLDG-SIM] Using -999 in Min OA Schedule in eQuest
I am trying to simulate the following system:
A DX cooler with VAV (HW reheat) that uses 100% outside air and
an indirect/direct evap cooler in the cooling months (the climate is Las
Vegas - very hot and dry). In the winter, the outside air should be at
a minimum as determine by the OA/person specified at the zonal level.
I created a Minimum OA Schedule and set the fraction to 1.0 for
the cooling months. In the help menu, and in the DOE2.2 documentation,
it says to set the schedule value to -999 when you want the fraction to
revert to the minimum calculated OA. When I tried to enter -999, I get
an error saying that negative values are not accepted. I tried changing
this in the input file, but when I open the file in eQuest, I receive
errors as well.
Does anyone know how to get eQuest to accept the -999 value in
the minimum OA schedule?
Thank you!
Kendra
Kendra Tupper
LEED(r) AP
FLACK + KURTZ
405 Howard Street 415.398.3833 Main
Suite 500 415.402.5840 Direct
San Francisco, CA 94105 415.433.5311 Fax
http://www.flackandkurtz.com kendra.tupper at sf.fk.com
<mailto:kendra.tupper at sf.fk.com>
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