Posted by Kenneth Staples (65.179.128.139) on October 12, 2002 at 12:20:02:
In Reply to: Re: Stirling engines posted by Davis Landstrom on April 23, 2002 at 07:05:17:
The average temperture of the soil at 8 feet underground is 56 F.
How about using a ground coil with either a passive or solar circulating pump?