[Equest-users] GSHP Simulation Results

[Karen Walkerman]

Are all zones satisfied without too many over or under-heated hours?  eQuest
will not auto-size your ground loop for you, and if it's not large enough,
your energy use will be really low, but the people in the space will be
freezing or roasting, depending on the season.

Have you made the switch in detailed edit mode or in the wizard?  If it's in
detailed edit mode, there are all kinds of things that can trip you up a
bit.

--
Karen

On Fri, Apr 24, 2009 at 1:15 PM, Anthony Hardman <
Anthony at geoenergyservices.com> wrote:

>  Two quick things to check would be the supplemental electric heat (for
> the air-source system) as well as your loop field design parameters.  Your
> numbers could be correct if it’s in an extremely cold climate, you’ve
> oversized the loop field or your loop field ground thermal properties are
> unrealistic for the area in question.
>
>
>
> *Anthony Hardman*
>
> Mechancial Engineer
>
> LEED AP
>
>
>
> Geo-Energy Services
>
> 14250 E Easter Pl, STE C
>
> Centennial, CO 80112
>
> 303-531-5292 v
>
> 303-805-3563 f
>
> 720-273-9973 c
>
> *www.GeoEnergyServices.com <http://www.geoenergyservices.com>*
>
>
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Stephen Parker
> *Sent:* Friday, April 24, 2009 3:03 AM
> *To:* equest-users
> *Subject:* [Equest-users] GSHP Simulation Results
>
>
>
> Hello everyone,
>
> I have modeled a ground source heat pump within the building I have
> designed and have been getting results that seem almost too good to be
> true.  I decided to compare my results with a typical high efficiency air
> side heat pump and discovered that the geothermal system is operating about
> 65-75% better than the air side heat pump in terms of cost.  The results
> from the air side heat pump appear to be correct and are reasonable for my
> design.
>
> Has anybody else ever gotten results for a geothermal system design that
> were much better than expected?  If so, was there something incorrect within
> your model or have you deemed it as an internal flaw of eQUEST?  This
> project is for my masters thesis, so I am trying to justify my results as
> much as possible.  For my system I am using two 3.5 ton GSHPs with an EER of
> 21.8 and a COP of 4.4, which is rather efficient.
>
> Thanks,
>
> Stephen Parker
> Bucknell University
>
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