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

[Patrick Keeney]

Thanks for your responses, Brian.

Where do you find these help files that you mentioned?  Are you talking
about the tutorial and reference PDFs in eQUEST, or is there something more
comprehensive like full project examples with the pd2 and inp files?






On Mon, Jun 6, 2011 at 3:02 PM, Brian Fountain <bfountain at greensim.com>wrote:

> The added pumping power is likely from the default 200 ft of static
> pressure on the lake/well ground loop.  Try changing this.
>
> I've only played with 1 of those system types but I found it was very
> sensitive to the 4 temperatures on the "Miscellaneous" tab of the chiller
> (and the defaults were not helpful -- but the values in the help file were.
>
> Wish I could be of more help -- good luck.
>
> Brian
>
>
> On 6/6/2011 2:12 PM, 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
>
>
>
>
>
>
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-- 
Patrick J Keeney
MArch-MSSD Candidate
410-299-5627
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