In outback Queensland there is a small town called Birdsville, it has a
electricity generation plant that is driven by hot bore water using a
refrigerant to drive a turbine.
This really isn't "new"... it was done in the 1970's as a demonstration
project by Honeywell. They got their heat from solar panels.. and powered
a Freon 11 turbine.. made about 3kw of electricity, and powered a
recip compressor using Freon 22 for air conditioning. It was completely
self contained, once the sun was up.
The "lab" was in two 40 foot over-the-road trailers.. The solar panels
folded down over the top and side of the trailers.. and the energy
storage (20,000 lbs of rocks in big water tanks), generator, the
turbine cycle and the "arkla" absorbtion unit were in the other trailer.
Made enough AC power and airconditioning to "freeze people out" of both
trailers and run a slide show, plus all the instrumentation, on a normal
Florida sunshine day. In fact, if you didn't use the heat it would cause
the solar collectors to boil.. causing all sorts of problems.
It was quite different, as they were using a different heat source, IE hot
water, available 24 hours a day, it is a commercial venture that supplies
power to a town.
It is interesting that the system you described was made way back in 1970
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