[Equest-users] GSHP Loops

[Nick Caton]

Regarding the pumps - it may seem a little unintuitive, but look to define the circulation pumps on the loops themselves, not on the GLHX element.  Also, Larry's posed situation is a little simpler when you consider that "standby" pumps for redundancy don't need to be modeled.  Only define the equipment that is running at any given time.

 

If you have multiple loops operating staged in parallel, look to define the # of pumps after doubleclicking the pump in question in detailed mode (in the component tree).  Right click those fields and check those help files for more info ;).

 

As may be apparent, you're not going to get a lot done in the way of defining an actual system until you're in detailed mode by the way - just a heads up in case anyone hasn't realized that yet.

 

The GSHP curves referenced below are great if you're designing around the corresponding Carrier equipment...  Some take the approach of finding the curve corresponding to the equipment that's the closest match, others are comfy with drilling their manufacturer reps and determining the exact info required to create custom performance curves...  I'm aspiring to be the latter category myself =).  One thing everyone seems to agree on is that the library curves (that came with eQuest) for a heatpump chiller aren't appropriate for modeling GSHP's.

 

~Nick

 

 

 

NICK CATON, E.I.T.

PROJECT ENGINEER

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olathe ks 66061

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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Daniel Deese
Sent: Monday, June 28, 2010 11:14 AM
To: Fish, Lawrence; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] GSHP Loops

 

Larry,

 

            I just looked, and I don't think you can assign a pump to your ground source heat exchanger.  It may depend on the type of the heat exchanger (lake/well, vertical loop, etc.), so don't be afraid to try.  Under the heat exchanger properties, click on the "attachments" tab, and see if you can attach at pump to the loop.  The pump/s described on that tab would be the two 500 gpm pumps you describe.  You would then attach another pump to that circulation loop, and that pump would be your 1,000 gpm building circulation pump.  Technically, your two 500 gpm pumps are acting as primary pumps for your ground loop heat exchanger, and the 1,000 gpm pump is acting at the secondary pump serving the building.  If eQuest won't let you attach a primary pump to your ground loop heat exchanger, I'm stumped.  If you find out that there is a geothermal heat exchanger type that will allow you to attach a primary pump to it, please respond to the list, and all would appreciate it.  I hope this helps.  Thanks.

 

daniel

 

Daniel I. Deese, EI| CRB Consulting Engineers | 

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Email: daniel.deese at crbusa.com <mailto:daniel.deese at crbusa.com>  

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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Fish, Lawrence
Sent: Thursday, June 24, 2010 4:08 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] GSHP Loops

 

Hi Everybody -

 

So I've been lurking on the list for a little bit now and have a 2 questions I was hoping could be answered. First off, looking around some people say its necessary to download the GSHP curves( from 2002 located at http://www.doe2.com/download/eQUEST/) while others say its not, does anyone know the status for the latest version, 3.63b?

 

Second question, a modeling question, is in terms of our GSHP. I'm still pretty new to modeling, so if it a silly question, I apologize. I have 2 500 GPM pumps (+1 Standby) that are pulling water from our well field, and 1 more 1000gpm pump (+1Standby) pumping to the different rooms in our building. In terms of the attached image, Pump Properties, what Pump(s) is eQUEST looking for? My pumping to the Well field or to the building? Do I need to average the pumps I have?

 

Thank you in advance for your time and help.

 

Best Regards,

Larry

 

 

 

Lawrence Fish 

	
732-584-0262 

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

PS&S 

integrating design & engineering 

 

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