[Equest-users] Question on a L2LHP with a Lake/Well GLHX

[Carol Gardner]

Taylor,

I have not done this system and only have time for a quick reply, but when
eQUEST seems to just not be "seeing" a piece of equipment, I start checking
my schedules and pertinent keywords to make sure the equipment knows it's
supposed to be on.

Good luck!

Carol


On Mon, Jun 6, 2011 at 11:12 AM, <TaylorRoberts at eaton.com> wrote:

>  Hello everyone,
>
>
>
> I am trying to model a HVAC system that is composed of a central geothermal
> system that uses a heater/chiller with back up boilers to provide hot and
> chilled water to AHU for a VAV air-side system. Following the advice I found
> on the archives from the Loop to Loop Heatpump in eQuest discussion I
> modeled a system with a L2LHP that uses a lake/well loop (see screen shot).
> I made sure to zero out the static head for the GLHX and changed the max hot
> water temp in the hot water loop to 130F to be compatible with a heatpump. I
> compared this system to a basic chiller/boiler VAV system to see if it
> showed any signs of improvement and the results have been very puzzling. The
> geothermal system is using slightly less energy to cool but isn’t providing
> any heating to the system. Instead the boilers are providing all of the
> heating. When I remove the boilers to make the L2LHP provide all of the
> heating it is performing terribly using an enormous amount of electricity to
> heat. Also, I assumed that there would be a pumping power increase but the
> L2LHP is using about 3X the electricity as the boiler/chiller system and
> this seems way too large.
>
>
>
> Has anyone had any luck modeling a system like this or has any ideas why my
> L2LHP model is using more energy than a standard chiller/boiler system?
>
>
>
>
>
> *Taylor Roberts, EIT*
>
> Energy Solutions Intern
>
> Energy Solutions Group
>
>
>
> E M C Engineers, Inc.
>
> Eaton's Electrical Services & Systems
>
> 970-208-7917
>
> TaylorRoberts at Eaton.com
>
>
>
>
>
> _______________________________________________
> Equest-users mailing list
> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
> To unsubscribe from this mailing list send  a blank message to
> EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG
>
>


-- 
Carol Gardner PE
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20110606/cd56342d/attachment.htm>