[BLDG-SIM] Water-to-Water Heat Pump Chillers and GLHE's

[Mike Tillou]

Jeff,
 
My experience is that it takes some effort to properly calibrate a
2-pipe system in eQuest, especially if you're trying to get all your
zones into the t-stat throttling range so you don't have a lot of unmet
heating and cooling hours.  I've had the most success operating the
2-pipe circulation loop using the SCHEDULED command.  You can define a
heating and cooling schedule of type ON/OFF/TEMP where the temp value
you enter is either a zone or outside air lockout temp.  Leave yourself
enough of a deadband to minimize bouncing back and forth between heating
and cooling on an hourly basis.  You may also need to disable heating or
cooling during certain parts of the year (ie: You may not want your
system to switch from cooling to heating for 1-2 hours because of a cold
August morning.)
 
Mike
 
Michael Tillou, PE 
ETC Group - Energy Engineering for a Sustainable Future 
Ph:413-458-9870 

	-----Original Message-----
	From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of
Jeff Staller
	Sent: Friday, February 23, 2007 1:57 PM
	To: BLDG-SIM at gard.com
	Subject: [BLDG-SIM] Water-to-Water Heat Pump Chillers and GLHE's
	
	

	 

	In eQuest I am attempting to model a proposed system that
utilizes a 'well-water-to-water heat pump' type chiller that will be
attached to a vertical well ground loop heat exchanger. The chillers are
modular and cycle on and off to meet demand, so they operate at a
constant efficiency.  They will be providing HW and CHW to 2-pipe fan
coil units.  The DOE2.2 documentation indicates this chiller type is
Heat-Pump and that this chiller type can only be attached to lake/well
water loop.  By selecting the lake/well water loop, I am unable to
define the vertical well characteristics, i.e well depth, configuration,
etc.  Does anyone know of a way to attach the Heat-Pump type chiller to
a vertical well system?  If not, is there a method to better describe
the capacity of the lake/well loop?  And finally, does anyone have
experience modeling this system type and can provide any insight?

	 

	Thanks,

	 

	Jeff

	 

	Jeff Staller, CEM

	CTG Energetics

	949-428-6293

	 

	 

	 

	
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