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Re: Feasible new approach to solar power use? - Metal bars thermal - Page 4

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Posted by FKohler on January 14, 2009, 8:19 pm
 

Seehttp://www.absolicon.com/ . For the time being, their product X10 is

Yeah, I particularly like the use of steam but the turbine is the key
issue. In addition, steam is a more complex system, needs high
pressure, thus, its not that simple to be competitive at small
scale....

Thus, I started thinking somthin different, with the main idea of
being a simple and no-maintenance system to achieve competitive cost,
in spite of focusing on efficiency improve to achieve competitive cost
(the metal linear expansion idea described below, of which I dunno if
is a possibility).

But the idea of using pv combined with solar concentrator (parabolic
trough) is a real possibility!! I like because it would certainly be
more cheap than buying standard pv panels and its maintenance is very
low. But my question is: the pv area is much smaller thus, does the
higher temp pays off or such pv to use in higher temp are different
from standard models in the market???


Posted by azuredu on January 15, 2009, 5:16 am
 


You should be able to find some responses in the Absolicon site, but
technically there are some issues. I think that's why Absolicon is
actually the only one successfully making a product. The basic idea is
not new: it dates back at least to the 70s.

I can tell you what are the basic issues. First, a non-concentrating
pv panel gets uniform exposure to sunlight, while concentrating pv
exposure is never really uniform. And pv cells hate variations in
exposure.

Secondly, the hotter a cell is, the lower the efficiency.
Concentration heats up the cells, which lowers the efficiency.

Thirdly, by the nature of pv, concentration itself increases the
efficiency if the above two problems are solved.

At end end, at 50C as done by Absolicon, you should get a slightly
better efficiency (1 or 2 % more) than non-concentrating cells.

Of course, concentrating cells are probably slightly different than
non-concentrating ones, but the difference is not in the fundamentals.
Roughly speaking, it concerns how to get out the higher current
density.

In terms of corst, I let you guess. I don't want to alert the pv panel
vendors at this stage.

Posted by Rick... (The other Rick) on January 15, 2009, 10:53 am
 

Seehttp://www.absolicon.com/ . For the time being, their product X10 is

Hi, The have a look at The Phoenix Turbine Builders Club
http://www.phoenixnavigation.com/ptbc/home.htm
They are currently working on a closed loop ORC Tesla turbogenerator.
They also have plans for a Experimenter's 4.5 inch DIY Tesla Turbine.

Also, the Australians built a Solar powered generating system back in the 80s in
White Cliffs.
They used parabolic collectors and the generator was a modified diesel engine.
http://www.rossen.ch/solar/wcengine.html

Rick... (The other Rick)

Science and sound engineering will always prevail in the end
"for nature cannot be fooled" [Feynman]

Posted by FKohler on January 12, 2009, 5:47 pm
 On 12 jan, 14:19, david.willi...@bayman.org (David Williams) wrote:

Good point. Maybe Ill need to work with Aluminium+Zinc or other
appropriated combination. It has to be a metal with the highest
possible thermal expansion coefficient and an adequate resistance with
temperature around 350 to 450o C.

Posted by FKohler on January 15, 2009, 2:41 am
 On 14 jan, 21:36, david.willi...@bayman.org (David Williams) wrote:

Another alternative is to adapt a car turbocharger. But either small
steam engines for use in toys and turbochargers are not that efficient
right?


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