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Parabolic Trough Target Improvement - Page 2

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Posted by Eric on September 1, 2009, 9:28 pm
I'd be interested in what kind of results you got.
Did you try heating a tank of water? At a given flow rate
what kind of temperature rise do you see from inlet to outlet?
How long does it take to heat, say, a 50 gallon water tank from
some starting temperature to some ending temperature?
What is the environment, outdoor temperature, general location etc.
I remember years ago me and another guy experimented with something similar,
it was unbelievable how fast and how hot the water got, we only had a small
amount of water but the outside temperature was a sunny 10F (In Maine,
winter time) and we managed to make steam in short order.
Please post more of your experimental results -  

Posted by Morris Dovey on September 1, 2009, 10:12 pm
Eric wrote:

I haven't made any of the tubing yet - I'm still scratching my head over
the problem of precise tube rotation (the equipment I have to do that
job lacks the necessary precision) and support of long tubing lengths,
which I don't expect to be a big problem but will depend on my solution
to the rotation problem.

My engines all operate on hot air - so I haven't even considered heating
water - and I think I can use this improvement to at least triple (and
possibly quadruple) the heat energy captured by the same reflector.

Most of what I do eventually appears on my web site - and these days I
seem to spend a fair amount of my time trying to help other people
who're working on parts of the project that I'd thought I'd have to do
all by myself...

...so, please feel welcome to take this and see how much of an
improvement you can produce in your water-heating project.

It was to support projects like yours that I posted the web page. :)

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

Posted by Frogwatch on September 2, 2009, 1:58 am
Cool, cool, cool.  I love seeing stuff like this.  Maybe you could use
something like this as a concentrator for a solar still to desalinate
water.  Lots of places have lots of sunshine and salt water and no
fresh water.

replace the # with @ for e-mail

Posted by Ahem A Rivet's Shot on September 2, 2009, 3:56 pm
 On Tue, 1 Sep 2009 18:58:27 -0700 (PDT)

    It doesn't take concentrated solar to desalinate water, the tricky
part is doing it sufficiently cheaply, efficiently and reliably without
introducing risks of infection or impurities getting into the desalinated

Steve O'Hara-Smith                          |   Directable Mirror Arrays
C:>WIN                                      | A better way to focus the sun
The computer obeys and wins.                |    licences available see
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Posted by daestrom on September 3, 2009, 9:57 pm
 Morris Dovey wrote:


Great posts.  Glad to see some real, informative and helpful stuff for a
change (the spam has been getting pretty bad).

Would love to see your engines when you get 'em going.


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