[Bldg-sim] Ground Source Water-to-Water HP in eQuest

[Anthony Hardman]

If you don't want to use outside programs to estimate the ground heat
exchanger response, you can input the condenser loads directly into the
ground heat exchanger water loop as a process load.  

 

For GSHP's, just make sure you're using heat of extraction spec data for
your condenser loads, not total heating capacity.

 

Integrating the loads from multiple systems (DHW, Bldg, et. al.) into a
single GHX also yields a more cost effective (fewer bores) GHX from an
installation perspective.    

 

Anthony Hardman

Mechanical Engineer

Geo-Energy Services

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Nick Caton
Sent: Tuesday, November 03, 2009 8:37 AM
To: Jackson, Alan
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Ground Source Water-to-Water HP in eQuest

 

That's pretty much what I've done for a few projects.

 

1.       Calc your loads incident on the loop, either using eQuest or
another program

2.       Use those loads to determine the annual thermal behavior of the
ground loop using a program like the free GS2000 or a similar ground-loop
design tool.

3.       Use the thermal behavior output of your ground-loop software of
choice to create a custom temperature schedule.  If you want a more detailed
explanation of the step-by-step process within eQuest, search for my name in
the eQuest/Bldgsim archives.

 

~Nick

 

cid:489575314 at 22072009-0ABB

 

NICK CATON, E.I.T.

PROJECT ENGINEER

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

Check out our new web-site @ www.smithboucher.com 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jackson, Alan
Sent: Tuesday, November 03, 2009 9:20 AM
To: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Ground Source Water-to-Water HP in eQuest

 

I believe the methodology that has been implemented with success is to use
the WTW HPs with the lake well, but to use a schedule for well water
temperatures either taken from a separate run with WTA and closed loop, or
to take the temperatures from another yearly sim in either GLHE-PRO or
GS2000.

 

 

Alan Jackson, LEED AP
KlingStubbins

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Garcia, Robert
Sent: Tuesday, November 03, 2009 10:04 AM
To: 'bldg-sim at lists.onebuilding.org'
Subject: [Bldg-sim] Ground Source Water-to-Water HP in eQuest

 

This topic appears to be a gray area within eQUEST.  Has anyone been able to
successfully model a Ground Source Water-to-Water HP connected to a closed
loop Geothermal Well Field?

 

The WWHP is to serve a radiant floor.  In addition to the WWHP, the design
also has multiple Water-to-Air Heat Pumps connected to the same well field.
Issues rise when trying to figure out how to model the effect of the WWHP on
the Well Loop.  

 

In the past I have used the Loop-to-Loop Chiller to model a WWHP, but the
chiller requires a connection to a Lake-Well type loop.  

 

Thanks in advance.

 

Robert Garcia |AKF|

 

 

 


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