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600 sf of trickle collector = $600 - Page 5

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Posted by gosolar23 on November 11, 2005, 3:46 am
 
It would be nice if the water swamped the entire 3" valley, but in
reallity probably a little river would be created.  I guess you think
having the water in contact with the warm vapor helps at all, huh.


Posted by Gary on November 11, 2005, 4:05 pm
 
gosolar23 wrote:

I guess you think

No -- see below.

The equations apply to collectors that have a tube carrying the heat
transfer fluid that has a fin thermally bonded to it.  As an example,
you might have a half inch copper pipe soldered down the center of a 5
inch wide strip of copper sheet with 2.5 inches on each side.  I was
thinking that the analog on your collector is a narrow stream of water
going down the middle of the gulley (the pipe) that is thermally
bonded to a wider fin (the full gulley and up to the adjacent ridge on
each side of the gulley).  In your case the thermal bond between the
"pipe" and the "fin" is excellent, since its all the same piece.  The
contact of the water with the "pipe" may not be as good -- I guess
this would depend on the width of the flow path and the flow conditions.


These Thomason style collectors were looked at in great depth a few
years ago -- I think if you googled on something like:
"Harry Thomason trickle solar collectors" you will probably find a ton
of information -- maybe including some on material choices?

But, I think building a small one is still a good idea, since it
addresses all the other issues that come up in collector design/build.


--


Gary

www.BuildItSolar.com
gary@BuildItSolar.com
"Build It Yourself" Solar Projects









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Posted by gosolar23 on November 11, 2005, 6:41 pm
 I sense some anger and frustration in some of your voices or maybe just
heavy sarcasm (Nick).

I am trying to do the right thing.  I have no illusions that I am going
to provide all of my Energy needs, but I hope to provide 50% (mostly
DHW).    Maybe with a good grey water heat recovery system, another
10-20%.

I am constrained that this house will have a relatively flat roof
(20%).  But it is big and no one will see it (600 SF).  This is a
classic Tudor and I can not fill the southwall with Glazing as their is
a really big old house just 10' away.  Lots are all 40' wide by 100'
And everyone is at the side yard set backs.

Many, many options available, but most very expensive.   I like the
trickle collector because it is safe and reliable (although not very
efficient) and very inexpensive.  It will be much cheaper than the
copper roof I will put on the rest of the house ($0/SF).

PV     $0-$0k
Enegrie Solaire    $0K
Tube and fin         $0K  (80 fin and tube collectors, prone to
failure)
Trickle collector     $k    With storage.  Just Like Harry Thomason
wanted.

IF I COULD JUST FINE SOME DAMN ALUMINUM ROOFING OR SIDING.  Maybe I
will just custom fabricate it at a local shop.  Steel is really cheap,
really black, but not a very good heat conductor.


Posted by John on November 14, 2005, 6:52 pm
 I looked at something similar years ago.  Go to the customer service counter
at a lowes.  They can special order galV roofing with valleys 1.25 inches or
1.50 inches on center. Note that they only stock 3 inch in the store.  You
can order to any length you desire. I forget the cost per running foot but
it was comparable to the 32 inch in stock flavor.   I believe that this
would be better than valleys that are 3 inches on center withy the heat
having less travel distance to the water.
John

: I sense some anger and frustration in some of your voices or maybe just
: heavy sarcasm (Nick).
:
: I am trying to do the right thing.  I have no illusions that I am going
: to provide all of my Energy needs, but I hope to provide 50% (mostly
: DHW).    Maybe with a good grey water heat recovery system, another
: 10-20%.
:
: I am constrained that this house will have a relatively flat roof
: (20%).  But it is big and no one will see it (600 SF).  This is a
: classic Tudor and I can not fill the southwall with Glazing as their is
: a really big old house just 10' away.  Lots are all 40' wide by 100'
: And everyone is at the side yard set backs.
:
: Many, many options available, but most very expensive.   I like the
: trickle collector because it is safe and reliable (although not very
: efficient) and very inexpensive.  It will be much cheaper than the
: copper roof I will put on the rest of the house ($0/SF).
:
: PV     $0-$0k
: Enegrie Solaire    $0K
: Tube and fin         $0K  (80 fin and tube collectors, prone to
: failure)
: Trickle collector     $k    With storage.  Just Like Harry Thomason
: wanted.
:
: IF I COULD JUST FINE SOME DAMN ALUMINUM ROOFING OR SIDING.  Maybe I
: will just custom fabricate it at a local shop.  Steel is really cheap,
: really black, but not a very good heat conductor.
:



Posted by gosolar23 on November 14, 2005, 11:31 pm
 
John wrote:

Did you look into glazing for this option?


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