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Anyone interested in building cheap DIY parabolic troughs? - Page 4

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Posted by azuredu on November 15, 2008, 1:48 pm

The difference is that work applied to deform an elastic wall is not
lost: it is recovered when the wall deforms back. Well, depending on
the material.

Sorry, but I meant output power per volume of engine. This is
certainly an important criterion for such a product, whatever the

No, efficiency is only one of the objectives. There are also cost and
volume that are important too.

Don't worry; that will come.

Yes but would it be better to send me by email? This is off subject.

Posted by GEOD998 on November 25, 2008, 8:25 pm

i finally managed to find a few minutes to check out the group page
again..and at first glance i was ready to dump the whole thing.adds
for shoes purses and god knows what else made me wonder why i even
bother...BUT...then..i find this exchange between you two
brainiacs,and it rekindled my hope for the web and these groups.i must
admit that I was a bit leary of azured's first post and the tone of
the tit-for -tat that was seemingly winding up tightly,but then the
very spirit of what I think the group and the whole WWW beamed through
a spirited but civil exchange of ideas and info that i found
educational and exhilerating that addressed just about everything i'm
here for. Thank You Morris and Azured for keeping the true spirit of
free exchange of information alive....now if we could just get rid of
the shoesalesmen,lol

Posted by Morris Dovey on November 25, 2008, 9:42 pm
 GEOD998 wrote:

I'm afraid that there's only one brainiac in that dialog - and that's
the gentleman on the French Riviera.

I agree - usenet is (or can be) one of the most powerful tools for
sharing ideas. I've been tremendously enjoying one of the (normally
invisible) side effects of this conversation - a Korean engineer
resonated and posted links on a forum in Seoul resulting in a feeding
frenzy at my web site that's finally beginning to slow down a bit today.
It makes me wish I could speak Korean (along with French, German,
Cantonese, Danish, Mandarin, Italian, Finnish, Japanese,...)

Civility doesn't cost anything - and everyone knows things I don't. I
figure it's in my best interest to keep both these facts in mind and to
avoid burning bridges.

The shoe salesmen and the tinfoil hat wearers are vulnerable to
filtering if you use almost any regular mail/news client - and BTW,
there are a number of free news servers about. I use aioe.org as a free
backup for my normal/local service (without filtering so I have a backup
to handle cases where my filtering was overzealous).

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

Posted by john on November 28, 2008, 2:59 am
 Now you've gotten me interested in your cheap thermal storage system.
Could you give more details? (Please...!?)


azuredu wrote:

Posted by azuredu on November 29, 2008, 6:14 am

Sure but I have to prepare technical explanations, so probably in

For the time being, the rough idea. First all, this is (best suited)
for high temperature thermal storage, in the range of 200C to 400C.
With thermal oil as heat exchange fluid. This is usually the case for
large solar power plants, but the cheap sollar collectors will soon
bring this operating mode to ordinary homes.

The idea is very simple. You melt recycled glass to form some kind of
bricks, and let the oil pass thru these bricks. So it is the glass
bricks that store heat for nighttime use. As it is with high
temperature, you will be able to get electricity generation at night,
for example to charge your electric car.

Why this will be cheap: recycled glass is a kind of urban waste for
which it is hard to find reasonable use. So sometimes people will even
pay you to use it. All you need is the cost of energy to heat and melt

And maybe the biggest technical point is why the glass bricks will not
break under frequent temperature changes. Well, please be a little bit
patient for these details.

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