[BLDG-SIM] Indirect Evap Cooling Not Appearing in BEPS Report

[Mike Tillou]

Kendra,
 
Without seeing your model I can only guess at what is going on.  I am
assuming you are using the add-on preconditioner and not the system type
EVAP-COOL. 
 
Most likely you have not properly defined keywords EVAP-CL-AIR and
EVAP-CL-LIMIT-T.  The default for EVAP-CL-AIR is the minimum OA ratio
(low airflow may explain the poor indirect cooling results).  You must
also be careful because the air-side economizer will also effect how the
indirect/direct add-on will operate.
 
I suggest you review the eQuest documentation which should help explain
how the system is intended to work.  You can find the Direct/Indirect
keyword explanations in the "Vol 2.-Dictionary" documentation file.
Check under HVAC System - Ventilation after the keywords for ERV heat
recovery
 
Good luck
 
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: Wednesday, April 26, 2006 12:55 PM
	To: BLDG-SIM at gard.com
	Subject: [BLDG-SIM] Indirect Evap Cooling Not Appearing in BEPS
Report
	
	

	I am trying to model an indirect evaporative cooler in eQuest,
and am encountering a the following problem.

	No space cooling energy is being shown in the BEPS report for my
indirect evap coolers - in fact, there is no change in any of my end use
categories!  If I change the type to Direct, then the report shows space
cooling savings, and increased fan energy (from added pressure drop) as
expected.  

	I looked in the supplemental Evap. Cooling report that DOE-2
provides, and this report shows a total cooling energy of about 1,000
MBtu for the indirect case.  A very small amount of electric energy is
being consumed by the pump, but not nearly enough to offset the cooling
savings.  This report also shows that the indirect evap. cooler is
operating for about 6000 hrs/yr (location is Las Vegas) - with this
runtime, it seems impossible that the there is no change in any end use
categories in the BEPS report!

	I also printed hourly reports for the electric power and total
cooling of the indirect evaporative cooler, and these reports indicate
that the evap. cooler is running and performing cooling.

	Does anyone know why this cooling is not appearing in the main
DOE-2 reports, such as BEPS (or the reports that come up in eQuest)?  I
don't understand why the reports account for direct evaporative cooling,
but not indirect.  

	Thank you in advance!

	Kendra

	Kendra Tupper           

	 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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