A New System
for Open, Location Independent, Reliable, Clean and Renewable Energy.
Rotating Displacer Solar Stirling Engine
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One of the concepts I have been working on is using a large rotating
displacer in a gamma style Stirling, like this:
The idea is that by using a balanced rotating solid 1/2 cylinder in
a
tube, there in minimal energy input in moving the displacer (versus
a
reciprocating displacer) and direct heating/cooling of a large
surface
of the displacer is possible. Heat is applied to one long side of
the
tube and a cooling exchanger on the other. I would imagine a copper
tube
painted black would be a good material for the outside of the
displacer
tube with the cooling tubes soldered directly to the front. I'm not
sure
plastic would transfer heat well enough and not warp in a
concentrated
solar system. The displacer would probably be workable in plastic,
I was
thinking of just sawing a pvc pipe in half and glue it to some flat
stock with an axle running though it and close off the ends and then
filling it with urethane foam.
In looking at what you are trying to do with a parabolic reflector,
you
could mount a tube with a rotating displacer in the center of the
parabola and then run cooling tubes along the front, something like
this:
http://www.energytower.org/images/rotating_displacer_solar_panel.png
The displacer could be rotated by a PV powered electric motor
sealed in
the displacer tube (to avoid having to seal the axle) and the front
of
the tube water cooled and with some reflective insulation, or the
"cooling" water could be further heated and used for domestic hot
water.
This page, images and other documentation on this website are
copyright Robert J.
Rohatensky, October 2006
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