[Equest-users] Modelling Geothermal with back up boiler and coolingtower

Anthony Hardman Anthony at GreenEngineer.com
Thu Oct 13 15:23:41 PDT 2011


Hassan, Kathryn's suggestion to use baseboards attached to a boiler are
probably your best bet.  I just wanted to add that you can add a cooling
tower to your ground loop just like you would any other condenser loop.  

 

Anthony Hardman, PE

LEED AP BD&C

Building Performance Analyst

The Green Engineer, LLP

Sustainable Design Consulting

50 Beharrell St

Concord, MA 01742

O: 978/610-2801

C: 720/840-7862

 

From: Kathryn Kerns [mailto:kathryn.kerns at bceengineers.com] 
Sent: Thursday, October 13, 2011 12:07 PM
To: Maudud Quazi; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Modelling Geothermal with back up boiler and
coolingtower

 

I have been thinking about this problem and I haven't had a chance to try
it, but I wonder if you couldn't add baseboard heating to the building and
attach a boiler and only run the baseboard system at low OSA temperatures
when you know the ground loop system isn't going to be big enough to take
care of heating. That might take care of the extra boiler heating problem.
The only thing I can think of to do for the cooling is to add a DOA to your
HVAC system that has a cooling coil connected to a fluid cooler and running
it when the OSA temperature is high.

 

I suggest the above system because I am pretty sure you can't add a boiler
or a fluid cooler to a ground loop.

 

It also might be possible to start with a WLHP system and see if you can't
add an additional fluid cooler and a boiler. Then increase the efficiencies
of the additional fluid cooler and boiler so the take on the energy
characteristics of a ground loop and arrange for these more efficient
devices to run during median OSA temperature conditions.

 

Hmmm, anybody have any other ideas? Carol, nice to see hear from you again.

 

  _____  

From: equest-users-bounces at lists.onebuilding.org on behalf of Maudud Quazi
Sent: Wed 10/12/2011 12:44 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Modelling Geothermal with back up boiler and
coolingtower

Hello all,

I am modelling a HVAC system that uses geothermal as primary source of
heating and cooling.  However, it uses a boiler for winter peak and a
cooling tower for summer peak hours.  Both of these uquipments are connected
to the geothermal loop.  Can anyone please give me some idea as to how I can
model this system.  Before, I tried connecting a boiler to GSHP loop in the
detailed mode but eQuest did not allow me to do that.  Thanks for your help.

Regards,

Hassan

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