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Constructing collectors for a solar hot water system - Page 2

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Posted by Anthony Matonak on September 28, 2007, 5:11 am
mark.fox@gmail.com wrote:

You might want to examine just how complicated you want to make things.
The easiest solar water heater to build would be a batch heater. This
is a water tank painted black inside an insulated box with a glass face.
Refinements might be double pane glass, extra reflectors and insulated
shutters that automatically close at night.

There are all kinds of plans available on the net.


Posted by mark.fox on September 28, 2007, 1:08 pm
On Sep 27, 11:11 pm, Anthony Matonak

I'm a computer scientist, so making things complex is simply
unavoidable. ;) Tinkering is what I do. The complexity of the system
I'm envisioning doesn't worry me. That may change once I start piecing
it together.

Our winters (in western Canada) are pretty harsh, a batch heater would
only be useable for about 6 months of the year. Our cabin is as much a
winter retreat as it is a summer one.

My post made it sound like I didn't have much knowledge of solar hot
water systems. My apologies. I have a rudimentary knowledge gained
from many evenings of Googling. I understand the basics. It's some of
the finer details that are eluding me. For example, I'm not yet clear
on how to bond copper pipe to aluminum. If I were, I wouldn't have
posted (yet).


Posted by Anthony Matonak on September 29, 2007, 2:54 am
 mark.fox@gmail.com wrote:

Maybe you can find some copper sheeting to use in place of aluminum?


Posted by mark.fox on September 30, 2007, 1:32 pm
 Anthony, thanks for the suggestion. I explored that route when I first
learned of flat plate collectors. Unfortunately, copper sheeting is
quite expensive compared to aluminum. For example,
http://jenkinsslate.com/store_flashing.html#20cop16  has a listing for
16"x40' rolls (more than enough for my two collectors) of copper
flashing for $99. The cost isn't prohibitive, and the copper would
perform better, but aluminum is about 1/3 the price. I'm a bit on the
aluminum side of this fence.


On Sep 28, 8:54 pm, Anthony Matonak

Posted by Jeff on September 29, 2007, 3:47 am
 mark.fox@gmail.com wrote:

I think what most home brewers do is make a wooden jig (just a slot) and
pound or press the aluminum sheet into it with a similar diameter pipe.
Smear a little heatsink compound on the copper and push the aluminum on.
Rivet another piece of aluminum  on the other side. Some rivets work
better than others (I forget the name) or you may wish to add a small
washer to keep the head from punching through. The flat side of the
collector plate should face the glazing as turbulence will increase
losses. See my disclaimer in other thread...


If I were, I wouldn't have

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