Size of Geothermal Unit
JessicaV
18 years ago
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18 years agoJessicaV
18 years agoRelated Discussions
Geothermal closed loop sizing
Comments (1)Hi, I know practically nothing about this, but a couple thoughts anyway :) It seems like the loop length for systems in dry ground would set the upper limit for loop length, and the loop length for the type of system where the loops are sunk in water (e.g. in a lake) would set the lower limit for loop length. It seems like both of these loop lengths should be available from the suppliers of these systems. I suppose you should be somewhere between these two lengths, but I am guessing thats a pretty larger range? I suppose the key question is how fast does the water migrate away from the coil and bring in new water as the coil heats or cools the sand/water near it. Seems like this is going to depend a lot on how tight the sand is, and (maybe) how much water is in the sand? I guess that you could do a small test trench and see how well it performs. I think you would need to run it for a long enough period to bring the thermally induced water movement around the pipe to equilibrium -- maybe days? Gary...See Moreregular geothermal vs. direct geothermal
Comments (36)Geothermal HVAC Myths Busted https://www.minisplitunit.org/ 1. Geothermal HVAC systems are not considered a renewable technology because they use electricity 2. Photovoltaic and wind power are more favorable renewable technologies when compared to geothermal HVAC systems. 3. Geothermal HVAC needs lots of yard or real estate in which to place the polyethylene piping earth loops. 4. Geothermal HVAC heat pumps are noisy. 5. Geothermal systems eventually “wear out.” 6. Geothermal HVAC systems only work in heating mode. 7. Geothermal HVAC systems cannot heat water, a pool, and a home at the same time. Fact: Systems can be designed to handle multiple loads simultaneously. 8. Geothermal HVAC systems put refrigerant lines into the ground. 9. Geothermal HVAC systems use lots of water. 10. Geothermal HVAC technology is not financially feasible without federal and local tax incentives....See MoreGeothermal Sizing Question (4 or 5 ton)
Comments (10)I didn't totally understand the airflow shown on the output either. Surely 1200cfm is too little. As for the floor cooling, all I can guess is that the floor temps around here are pretty mild, probably around 60-65 degrees year round, so no real cooling is necessary and in fact the concrete floors probably help cool the house some. Heating, however, is a different story. Concrete floors in the winter are very cold even here in Oklahoma. I will have some radiant floor heating in the master bath, but I don't think it is enough to affect the heating requirements of the unit. Everyone I talk to is telling me that the heating requirements are what dictate the size of the unit, not the cooling requirements. I like the idea of not running the backup, and on geothermal units I've been told that these backup heat strips are truly emergency only. Geo units do in this area do not need the backup units for daily operation down to around 5 degrees (which is very uncommon here) and they are only needed if the unit goes out. That is an advantage of going to the larger unit. The main question was about the airflow requirements of a 2700 square foot house. Is there not a general rule of thumb for CFM per square foot? Thanks,...See MoreCost of geothermal units
Comments (2)I figure they cost more because: - Lower production volumes than air-to-air units. - Higher price materials (to avoid corrosion problems in the water/freon exchanger). - Two heat exhcangers (water/freon and freon/air) - did you include a new indoor air coil in your $2K figure? - More involved controls/sensors. - Desuperheater coil & pump. - The 'because they can' factor....See Morezeot
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