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

[Brian Fountain]

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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