[Bldg-sim] GSHP in hot climate

[Scott Hackel]

Ying -
If your building is in the U.S., you can find the average ground
temperature in your area with the map in ASHRAE HVAC Applications,
Chapter 32.  For moderate climates like most of the continental U.S. the
average ground temperature is just a few degrees above average annual
air temperature.  In Zone 1, you could have an average ground
temperature near 80.  

If you do a GSHP system, you'll likely want a hybrid system that uses a
cooling tower or fluid cooler to balance your system, allowing the
ground loop to be smaller.  This may make it a reasonable system choice.

Scott Hackel

Energy Center of Wisconsin
Project Manager
455 Science Drive, Suite 200
Madison, WI  53711
608.238.8276  x129
shackel at ecw.org

-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of
yizhao1 at vt.edu
Sent: Friday, August 08, 2008 11:46 AM
To: Edward.A.Decker at jci.com
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] GSHP in hot climate

According to the source we got,  the ground temperature is 85F, although
the
ground temper in a lots of other locations in the world are about 55F.

Do you have some other source for the ground temperature?

Thanks,

Ying

Quoting Edward.A.Decker at jci.com:

> For a GSHP, the surface temperature of the earth should not matter...
> isn't the temperature below the surface what makes the GSHP work? A
> constant temperature of ~55 deg F.
>
>
> Edward A. Decker
> Project Development Engineer
> Building Efficiency
>
> Johnson Controls
> 1001 Lower Landing Road
> Suite 409
> Blackwood, NJ 08012
> Tel : 610-675-9603
> Fax : 856-228-6296
> Email : edward.a.decker at jci.com
> URL : http://www.johnsoncontrols.com
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> yizhao1 at vt.edu
> Sent by: bldg-sim-bounces at lists.onebuilding.org
> 08/06/2008 11:50 PM
>
> To
> bldg-sim at onebuilding.org
> cc
>
> Subject
> [Bldg-sim] GSHP in hot climate
>
>
>
>
>
>
>
> Hi-
>
> We modeled a building with GSHP in a hot climate (zone 1), so it is
almost
> used
> for cooling only. The air-side is PVAVS. water-cooled condenser with
GSWL.
> The
> cooling COP input is ~5. However, the system performs almost the same
as
> ordinary air-cooled chillers.
>
> We think the reason may be the high earth temperature (~85 F is used
due
> to the
> local
> climate).
>
> GSHP does not appear to be a solution for hot climate? Any one has
some
> resource
> of real data for this?
>
> Thanks,
> Ying
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