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From: Morris Dovey on 9 Jun 2010 17:52
On 6/9/2010 4:49 PM, Morris Dovey wrote:
> On 6/9/2010 1:31 PM, samsloan wrote:
>
> [ posting from alt.solar.thermal, games groups deleted ]
>
> Sam...
>
> If you're still interested in physics, you might find these pages
> interesting:
>
> High efficiency passive solar heating panels (the conventionally-built
> structure in the photo has stayed at 65�F or above indoor temperature
> since 2007)
>
> http://www.iedu.com/DeSoto/solar.html
>
> and a collector pipe for parabolic trough collectors that can be
> constructed to provide extreme absorbancy (required physics help from
> some of the folks on alt.solar.thermal)

http://www.iedu.com/DeSoto/Fluidyne/HTAbsorber/

> New stuff being developed all the time. :)


*2nd link corrected*

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


From: Ahem A Rivet's Shot on 10 Jun 2010 03:04
On Wed, 09 Jun 2010 16:52:01 -0500
Morris Dovey <mrdovey(a)iedu.com> wrote:

> > and a collector pipe for parabolic trough collectors that can be
> > constructed to provide extreme absorbancy (required physics help from
> > some of the folks on alt.solar.thermal)
>
> http://www.iedu.com/DeSoto/Fluidyne/HTAbsorber/

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/
From: Morris Dovey on 10 Jun 2010 04:00
On 6/10/2010 2:04 AM, Ahem A Rivet's Shot wrote:
> On Wed, 09 Jun 2010 16:52:01 -0500
> Morris Dovey<mrdovey(a)iedu.com> wrote:
>
>>> and a collector pipe for parabolic trough collectors that can be
>>> constructed to provide extreme absorbancy (required physics help from
>>> some of the folks on alt.solar.thermal)
>>
>> http://www.iedu.com/DeSoto/Fluidyne/HTAbsorber/
>
> Have you managed to make one of these and try it out in practice
> yet ?

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 $500 - 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/


From: Ahem A Rivet's Shot on 10 Jun 2010 04:35
On Thu, 10 Jun 2010 03:00:31 -0500
Morris Dovey <mrdovey(a)iedu.com> wrote:

> If you have access to a decently-large lathe (I don't), you might try

Sadly I don't.

> 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?

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/
From: Morris Dovey on 10 Jun 2010 11:02
On 6/10/2010 3:35 AM, Ahem A Rivet's Shot wrote:
> On Thu, 10 Jun 2010 03:00:31 -0500
> Morris Dovey<mrdovey(a)iedu.com> wrote:
>
>> If you have access to a decently-large lathe (I don't), you might try
>
> Sadly I don't.
>
>> 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?
>
> Mainly because like you I lack tools capable of doing the job,
> indeed you are far closer to having the tools than I am.

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/


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