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Re: Direct Use of the Sun's Energy - Page 2

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Posted by Ahem A Rivet's Shot on June 10, 2010, 7:04 am
 
On Wed, 09 Jun 2010 16:52:01 -0500


    Have you managed to make one of these and try it out in practice
yet ?

--
Steve O'Hara-Smith                          |   Directable Mirror Arrays
C:>WIN                                      | A better way to focus the sun
The computer obeys and wins.                |    licences available see
You lose and Bill collects.                 |    http://www.sohara.org/

Posted by Morris Dovey on June 10, 2010, 8:00 am
 
On 6/10/2010 2:04 AM, Ahem A Rivet's Shot wrote:

Not yet. I have some nice (thick-walled) 2" aluminum tubing and a
slitting saw & arbor, but need to get the saw reground (to a 10 angle)
and my CNC controller repaired before I can cut a prototype.

It's been pushed to the back burner because the repair to the controller
is likely to run around $00 - and getting the inline fluidyne engine
working well has a considerably higher priority for me than spending
money I don't have.

If you have access to a decently-large lathe (I don't), you might try
cutting sharp/steep threads to see how much of an improvement that
provides. If it strikes you as useful and worthwhile, why not give it a try?

--
Morris Dovey
http://www.iedu.com/DeSoto/



Posted by Ahem A Rivet's Shot on June 10, 2010, 8:35 am
 On Thu, 10 Jun 2010 03:00:31 -0500


    Sadly I don't.


    Mainly because like you I lack tools capable of doing the job,
indeed you are far closer to having the tools than I am.

--
Steve O'Hara-Smith                          |   Directable Mirror Arrays
C:>WIN                                      | A better way to focus the sun
The computer obeys and wins.                |    licences available see
You lose and Bill collects.                 |    http://www.sohara.org/

Posted by Morris Dovey on June 10, 2010, 3:02 pm
 On 6/10/2010 3:35 AM, Ahem A Rivet's Shot wrote:

Access to tools and larger-than-garage workspace seems to be a universal
problem - almost as serious as the decline of engineering education and
loss of practical shop expertise.

My plan is to push the fluidyne (solar -> mechanical energy) conversion
efficiency past the 1/3 mark, then integrate the "hot head" into the
collector pipe of a parabolic trough. At that point I'll be seriously
motivated to push energy absorption as high as can be managed. I think
this (absorber) approach will do the job, but there's a ways to go
before I'll be able to demonstrate a full-sized prototype.

It's not helping a lot that I only have IT skills to work with - as a
physicist-machinist, I'm strictly a wannabe trying to learn what I need
to on the fly.

--
Morris Dovey
http://www.iedu.com/DeSoto/



Posted by Tim BandTech.com on June 10, 2010, 12:31 pm
 
Yes, and the cost of PV panels has dropped substantially. A 4kW system
of the low cost panels will take up about 340 square feet; enough to
power a typical home in New Hampshire.
As for cost, well, I can beat $/watt for a straightforward grid-tie
system. Then there are the incentives- $k from the state, healthy tax
break from the feds for 30% of system cost; bringing system cost to
roughly $.40/watt. For a sunny location and at 0.15 $/kwH the system
payback with incentives is down to 13.5 years if prices hold. So don't
pooh-pooh solar electric. As the wave steepens these figures should
improve, but already supply and demand economics coupled with these
incentives has brought a nice change in just the last few years.

 - Tim

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