[Bldg-sim] GSHP in hot climate
jross-bain at smithdalia.com
Mon Aug 11 06:47:23 PDT 2008
I just wanted to throw in a comment from a "sort of" hot climate. Is this discussion referring to deep vertical wells or horizontal field lines? The field line types are highly dependent on correct depth and incorrect depth is a reason for many system performance problems. The well types are not foolproof by any means but tend to produce dependable results, even in Florida (where there are numerous installations).
Jeffrey G. Ross-Bain, PE, LEED
Smith Dalia Architects
621 North Ave NE
Atlanta, GA, 30308
From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Harry BOYER
Sent: Sunday, August 10, 2008 12:45 AM
To: yizhao1 at vt.edu
Cc: bldg-sim at onebuilding.org
Subject: Re: [Bldg-sim] GSHP in hot climate
yizhao1 at vt.edu a écrit :
> 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
> GSHP does not appear to be a solution for hot climate? Any one has some resource
> of real data for this?
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for ground temparature estimation, book PASSIVE COOLING OF BUILDINGS,
edited buy M. Santamouris and D. Asimakopoulos provide a whole chapter
on Ground cooling. This ref. includes an equation estimating time
evolution of ground temp. at a certain deep using various parameters as
soil thermal diffusivity,
average annual soil temp, time elapsed from the begining of the year, ...
This could be usefull.
Réunion Island University
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