[BLDG-SIM] Heat Recovery with Water Loop Heat Pumps in Equest

[Mike Tillou]

Matt,
 
You should use the PVVT system type in order to model water source heat
pumps that have OA capabilities.  This system type allows you to use OA
heat recovery, specify two speed or staged volume compressors and
generally do all the things you cannot do with a packaged water source
heat pump.  The default fan speed control is variable speed so you may
want to set that to constant speed and set the MIN-FAN-RATIO to 1.   
 
This system type behaves like a packaged single zone system in that you
can attach multiple zones but the system is only controlled by a single
control zone.  This is in contrast to the water source HP system type
which is strictly a single zone system type.  If you specify multiple
zones under a single WSHP system eQuest simulates each zone with its own
heat pump.
 
Mike
 
 
Michael Tillou, PE
ETC Group, Inc.
PO Box 7, Williamstown, MA 01267
ph. (413) 458-9870 fx. (413) 458-9875
www.etcgrp.com


	-----Original Message-----
	From: BLDG-SIM at GARD.COM [mailto:BLDG-SIM at GARD.COM] On Behalf Of
Matthew Dubrovich
	Sent: Thursday, September 28, 2006 2:47 PM
	To: BLDG-SIM at GARD.COM
	Subject: [BLDG-SIM] Dummy Zone for dedicated OA units
	
	

	Another question on this topic...

	 

	eQuest allows the OA for, say, a heat pump, to come from a
dedicated OA unit.  What is the best way to model this system when the
OA unit has heat recovery on it?  Assigning it to a dummy zone will not
allow for any heat recovery since there are no loads in the zone.
Another way would be to add heat recovery and OA to each individual unit
and not simulate the dedicated unit.  However, eQuest does not allow WL
Heat Pump systems to utilize energy recovery.  Another option may be to
change the individual system type to Packaged Single Zone with a heat
pump for heating and cooling then set up each to use heat recovery.  

	 

	Thanks for any ideas.

	 

	Matt Dubrovich

	 

	EMC Engineers, Inc.

	www.emcengineers.com <http://www.emcengineers.com/> 

	Making buildings work.  Better.

	Direct: (303) 974-1217

	(303) 974-1200

	(303) 974-1239 (fax)

	 

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________________________________


	From: BLDG-SIM at GARD.COM [mailto:BLDG-SIM at GARD.COM] On Behalf Of
Tupper, Kendra
	Sent: Friday, September 22, 2006 4:22 PM
	To: BLDG-SIM at GARD.COM
	Subject: [BLDG-SIM] Dummy Zone for dedicated OA units

	 

	Scott,

	 

	You can designate a small portion of the building to be a dummy
zone, or you can make the zone float off in space away from the
building.  The important thing is that the dummy zone has no loads (zero
people, lights equipment, adiabatic exterior surfaces, etc.).

	 

	Kendra

	 

	Kendra Tupper 
	LEED(r) AP 
	FLACK + KURTZ 
	405 Howard St. San Francisco, CA 94105 
	Direct          (415) 402-5840 
	Email   kendra.tupper at sf.fk.com
<mailto:kendra.tupper at sf.fk.com%20>  

	
________________________________


	From: BLDG-SIM at GARD.COM [mailto:BLDG-SIM at GARD.COM] On Behalf Of
Scott Runyon
	Sent: Friday, September 22, 2006 1:04 PM
	To: BLDG-SIM at GARD.COM
	Subject: [BLDG-SIM] Dummy Zone for dedicated OA units

	 

	I've read before that to correctly model a dedicated outdoor air
unit, one should assign it to a dummy zone.

	 

	How do I go about creating a Dummy zone for an outside air
handler?

	 

	Do I just make a small portion of the building its own zone and
assign this OA unit to it?

	 

	Thanks for all your help. Any other suggestionss with OA units
would be appreciated.

	Scott Runyon 

	 

	 
	 
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