[Bldg-sim] GSHP in hot climate
shackel at ecw.org
Fri Aug 8 10:49:25 PDT 2008
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.
Energy Center of Wisconsin
455 Science Drive, Suite 200
Madison, WI 53711
shackel at ecw.org
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
ground temper in a lots of other locations in the world are about 55F.
Do you have some other source for the ground temperature?
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
> bldg-sim at onebuilding.org
> [Bldg-sim] GSHP in hot climate
> We modeled a building with GSHP in a hot climate (zone 1), so it is
> for cooling only. The air-side is PVAVS. water-cooled condenser with
> cooling COP input is ~5. However, the system performs almost the same
> ordinary air-cooled chillers.
> We think the reason may be the high earth temperature (~85 F is used
> to the
> GSHP does not appear to be a solution for hot climate? Any one has
> of real data for this?
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