Posted by Eeyore on June 9, 2008, 3:35 pm
Bob F wrote:
> I got an estimate once on a "solar, geothermal" heat pump once. It used pipes
> buried in the ground to get heat for a heat pump. It also had solar panels on
> the roof to collect heat to warm the ground cooled by the heat pump, using the
> same pipes. At the time, the solar panels made the difference to get some kind
> of federal "solar tax credit".
Absurd since it's the ground heat that's doing the lion's share.
Graham
Posted by Jim Wilkins on June 9, 2008, 4:36 pm
> You get a small refrigerator freezer. You put 5 to 6 1 gallon jugs
> of water in it. Run the freezer at night. During the night the
> freezer will pump the heat out of the water and into your room. The
> water will freeze as the freezer extracts the heat of fusion out of
> the water.
> Mark
Look up "coefficient of performance". The efficiency drops as the cold
side gets colder.
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> buried in the ground to get heat for a heat pump. It also had solar panels on
> the roof to collect heat to warm the ground cooled by the heat pump, using the
> same pipes. At the time, the solar panels made the difference to get some kind
> of federal "solar tax credit".