Talk:Geothermal exchange heat pump

message: I'd like to know, as a function of temperature difference between ground and building-rooms, 
how efficient is the cooling system, and how efficient is the heating system. (In kW thermal 
delivered per kW of electricity consumed.)
It'd be very interesting to have an indicative figure (I've heard 3:1 and 4:1) and also to 
have a graph of efficiency versus temperature difference (is it 3:1 at all temperatures, or does efficiency 
vary with temperature difference?)
131.111.48.116 11:35, 30 June 2006 (UTC)
thread_title:  More information about efficiency? 

message: Aside from the expense of running the pumps and site positioning (what is your soil type, what surrounds the land, how warm is the soil...), I wanted to add the idea of the possibility of too many users. The ground temperature could be heated or cooled too much when there is a high density of pumps. This can cause the ground to heat or cool too much and would affect the functioning of all of the units over time. The efficiency of the heat pumps would then be lost. I know of an industry that used heat pumps for many years to refrigerate. The ground around the area is now much warmer. This can affect groundwater patterns and frost patterns among other things...  Dalilas 15:38, 7 September 2006 (UTC)
thread_title: Cons?

message: Does anyone know what this is a picture of?  (The filename translates to "geothermic probe").  Why is it included in this article?  Yabbadab 19:45, 6 December 2006 (UTC)
thread_title: Image

message: Where is the dividing line (in North America) where an air-source heat pump is not sufficient for winter heating and a ground-source pump is therefore needed?  —Preceding unsigned comment added by 65.93.87.81 (talk) 14:38, 14 November 2007 (UTC)
thread_title:  Where (geographically) will you need a ground-source (vs air-source) heat pump? 

message: A better description can be derived from this text I created (you may also include it as is; no copyrights on it):
; GEHP operation for greenhouses (with Hortimax-automation)
This system combines water/humidity application together with seasonal subterrainean heat and cold storage. In the system, the water is not only used to water/humidify the plants (in a closed circuit), but is also used as a storage medium for heat (held in a underground aquifer) aswell as for the cold (in a 2nd aquifer). The heat and cold stored in the water mass is when needed spread as hot or cold air trough the use of fans. In the described system, everything can be automated. Optionally, the primary heating can be done by heat pump (which derives heat from the outside air or soil)
An extra schematic picture can be found at:
Heat and Cold Storage
http://www.iea-eces.org/energy-storage/storage-techniques/underground-thermal-energy-storage.html 
Automation of underground Heat and Cold Storage system by Hortimax
http://www.hortimax.com/content/Multima_water.aspx
Finally, also mention the term "heat and cold storage". Aldough its not the correct term, it is often used as the primary description by the leading organisations.
Please shift trough the info provided and use it to clarify the article.
Thanks.
KVDP (talk) 09:47, 21 January 2008 (UTC)
thread_title:  Better description operation GEHP (soil storage) operation plus picture and coinage term "heat and cold storage"