Using a trench with septic drain field gravel surrounding
a pipeline containing a layer of anhydrous ammonia on the
bottom (like a sewer line) with about 250 psig vapor pressure
covered with a transparent material such as glass or Teflon
at grade level anchored by rock or dirt on the "berms" between
trenches could power expansion engines exhausting into
radiative or convective condensing "fields", with an ammonia
condensate return pump could generate kilowatts to gigawatts around the
clock at a cost of less than $0.50 per watt on the larger sized
plants.
In hill country the pipe could have an annular internal wick
to attain uniform wetting, and counter vapor flow entrainment.
Sounds like a heat pipe doesn't it?
Fred
