Doug Horgan
  • Mc Lean, VA
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Geothermal real-world performance
32 Replies

I've heard that measured performance of actual, installed geoexchange systems can be much lower than advertized COP numbers.Is anyone aware of any accessible, reliable reports about real-world…Continue

Tags: geothermal

Started this discussion. Last reply by Terry D. Davenport Apr 18, 2013.

 

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Terry D. Davenport replied to Doug Horgan's discussion Geothermal real-world performance
"Hi Richard. Radiant engineering in Bozeman MT designed the closed loop glycol system using Caleffi colectors and a crown 120 gal stainless water storage tank.   The house is 1400 ft2.  r 70 walls and roof.  R 40 slab…"
Apr 18, 2013
Doug Horgan replied to Doug Horgan's discussion Geothermal real-world performance
"Just wanted to check in and thank all the great responders. I particularly appreciate those who took the time to post links to studies. Overall it would seem there are not many studies, and they don't include many houses--but the studies that…"
Apr 18, 2013
Richard Scott Mills replied to Doug Horgan's discussion Geothermal real-world performance
"What is the name of the system? Any info on the home?"
Apr 18, 2013
Terry D. Davenport replied to Doug Horgan's discussion Geothermal real-world performance
"Hi Leonard.  May I recomend a solar thermal combi system.  It heats the domestic hot water and uses the excess heat stored in that water to heat the home at night time.  I have one system on a heavily insulated home (R 70 walls/ roof,…"
Apr 18, 2013
Richard Scott Mills replied to Doug Horgan's discussion Geothermal real-world performance
"Best practice put your investment into sealing and insulation. One time cost that can bring your heating/cooling down by 90% with proper orientation. Mini split for heat/cool and ERV/HRV for IAQ. Simple cost effective without having to go into…"
Apr 18, 2013
R Higgins replied to Doug Horgan's discussion Geothermal real-world performance
"I'll share what I've found struggling to get a geo system to justify a geo system at my place: 1.  You need the right distribution system in place already, low temp hydronic or high volume low pressure well insulated ducted air…"
Apr 12, 2013
Curt Kinder replied to Doug Horgan's discussion Geothermal real-world performance
"Could be...could be not. In expensive electric markets such as the northeast, NG is likely a slam dunk for those who have it. OTOH in cheap electricity markets, $0.08 or less, even if NG is available, Geo has a place at the table if for no other…"
Apr 5, 2013
Bob Blanchette replied to Doug Horgan's discussion Geothermal real-world performance
"Geo systems may be more efficient than NG, but they don't cost less to run since NG is such a low cost fuel source."
Apr 5, 2013
Bob Blanchette replied to Doug Horgan's discussion Geothermal real-world performance
"Once NG goes to global pricing electric power rates will increase also. Keep in mind what most of the new power plants use for fuel..."
Apr 5, 2013
Joe Romero replied to Doug Horgan's discussion Geothermal real-world performance
"Though none of my relatives or friend have installed this system but when I Googled the topic I found that GeoExchange is the most energy-efficient, environmentally clean, and cost-effective space conditioning system available as per the…"
Apr 5, 2013
Bob Pietrangelo replied to Doug Horgan's discussion Geothermal real-world performance
"I agree with NG's current prices, but do you REALLY think NG is going to stay cheap once it's able to be exported, or regulation and Taxes are applied as they are with oil? The US has the infrastructure to import LNG, but not to export it.…"
Apr 5, 2013
Bob Blanchette replied to Doug Horgan's discussion Geothermal real-world performance
"Thermal inertia is NOT considered in Manual J calculations!! Equiptment can be sized a bit smaller once inertia is considered, just don't expect quick recovery times."
Apr 4, 2013
Bob Blanchette replied to Doug Horgan's discussion Geothermal real-world performance
"My bad, I wasn't considering the deep south."
Apr 4, 2013
Bob Blanchette replied to Doug Horgan's discussion Geothermal real-world performance
"With NG at current prices, no way Geo will ever have a reasonable payback time. Geo's real market is all electric homes, or those on oil/propane."
Apr 4, 2013
Bob Pietrangelo replied to Doug Horgan's discussion Geothermal real-world performance
"Strip heat will be a requirement mostly north of NC. The amount it requires is a fraction of an air source unit. The amount of EH is so small it could cost $10 or less per year, the max I've seen is about $100/yr. Geo outperforms every other…"
Apr 4, 2013
tedkidd replied to Doug Horgan's discussion Geothermal real-world performance
"Following Curt's comment - a house this well insulated and air tight, & possibly with thermal mass, may not really experience the "peak" load you think about with a leaky house in Upstate NY (or anywhere else)...  Mass, and…"
Apr 4, 2013

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BOWA
Professional Certification
BPI, LEED AP+ Homes, CGP, CGR, GCP
Professional Interests
Remodeling, energy upgrades, solar
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http://www.bowa.com

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