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[BLDG-SIM] Modeling a variable air volume make up air fan system

For the virtual/dummy zone, just leave the zone heating and cooling setpoint schedules OUT of the zone command and make sure they aren't in any referenced SET-DEFAULTs, ZONE-CONTROL commands.

Without care DOE2 will violate that little thing about conservation of mass. As I understand it, DOE2 passes the temperature/humidity, from the first zone in the MUA system list, to the OA conditions of the calling system. However the program itself DOES NOT coordinate airflows.

Chris Jones wrote:
I haven't used eQUEST but the OA-FROM--SYSTEM is in DOE2.1e.  You need to create a dummy space and zone.  Set the temperature to the average make-up air supply. 

Greetings All,
 
I am working on a project where I have a make-up ventilation air system that serves 16 VAV air-handlers (one per floor).  The make-up air fan has a VFD to maintain constant pressure in the duct as the OA Dampers at each floor modulate open and closed.  I am using DOE2.2 (eQUEST) and need help using the OA-FROM-SYSTEM command.  Specifically, I cannot resolve how to add a system (make-up air fan) without a conditioned zone.  Do I just create a dummy zone that it serves or is there a better way.
 
Could someone who has used this command before and modeled a similar system please offer some advise.
 
Thank you.
 
Mike
 
 
Michael Tillou, PE
etc Group, Inc.
PO Box 749,  North Adams, MA 01247
Ph. (413) 458-9870   Mbl. (413) 652-1087  www.etcgrp.com
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Chris Jones, P. Eng.
14 Oneida Avenue
Toronto, ON M5J 2E3
Tel. 416 203-7465
Fax. 416 946-1005



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