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Do we have a good DIY water solar collector - Page 2

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Posted by gary on September 28, 2008, 2:35 am
 
Hi Mike,

Here are two collector designs that I have been working on:

This one uses copper risers with aluminum heat absorbing fins:
http://www.builditsolar.com/Experimental/CopperAlumCollector/CopperAlumCol.=
htm

This one use PEX-AL-PEX tubing to convey the heat transfer fluid, and
aluminum heat absorbing fins:
http://www.builditsolar.com/Experimental/PEXCollector/PEXCollector.htm

I think they are both pretty easy to build, but you can take a look at
the how-to's and see what you think.
The first first comes in at $/sqft, and the 2nd at $/sqft -- using
all new, high quality materials.
Most people will be able to find all the materials locally.
The saving is around  $00 per collector when you include the cost of
truck freight on commercial collectors.

The links include some very detailed how-to's.

By my testing, the first comes in at 96% of the heat output of the
traditional copper fins soldered or welded to copper risers, and the
2nd comes in at 84%.    The tests are here:
http://www.builditsolar.com/Experimental/PEXCollector/SmallPanelTests.htm

This is a DIY domestic solar water heating system that can use either
of the two collectors above:
http://www.builditsolar.com/Experimental/PEXColDHW/Overview.htm

More DIY collector plans here:
http://www.builditsolar.com/Projects/WaterHeating/water_heating.htm
and,
http://www.builditsolar.com/Projects/SpaceHeating/Space_Heating.htm


Gary









Posted by nicksanspam on September 28, 2008, 9:08 am
 


Where's the solar pond heater? :-)

Nick


Posted by amdx on September 28, 2008, 8:29 pm
 
Hi Mike,

Here are two collector designs that I have been working on:

This one uses copper risers with aluminum heat absorbing fins:
http://www.builditsolar.com/Experimental/CopperAlumCollector/CopperAlumCol.htm

This one use PEX-AL-PEX tubing to convey the heat transfer fluid, and
aluminum heat absorbing fins:
http://www.builditsolar.com/Experimental/PEXCollector/PEXCollector.htm

I think they are both pretty easy to build, but you can take a look at
the how-to's and see what you think.
The first first comes in at $/sqft, and the 2nd at $/sqft -- using
all new, high quality materials.
Most people will be able to find all the materials locally.
The saving is around  $00 per collector when you include the cost of
truck freight on commercial collectors.

 I see a lot about stagnation, I live in Florida, I think stagnation could
be a big problem
with the amount of sun here. I would think the copper version would be
safer.
Once I have hot water what else can I do with the heat?
 What methods are used to avoid stagnation (collector overheating) problems?
                             Thanks, Mike





Posted by gary on September 28, 2008, 9:40 pm
 
Hi Mike,
The collector with the copper risers and aluminum fins would for sure
be the safest choice from a stagnation point of view.
I think that all around its probably the better choice for most
people.   I looked into the PEX collector because there was a lot of
interest in making use of PEX in a collector.  With careful attention
to a good thermal bond between the PEX and the aluminum fin, it works
surprisingly well, but, I think, for most people its worth a little
extra to use the limited amount of copper and gain both performance
and more stagnation temperature resistance.

In Florida, solar heating domestic water is kind of a no-brainer.
I guess that depending on your location in Florida, winter space
heating is also an option.
Hot tub heating?

More applications here:
http://www.rushforthsolar.com/
and
http://www.builditsolar.com/Projects/PoolHeating/pool_heating.htm
and
http://www.builditsolar.com/Projects/SpaceHeating/Space_Heating.htm

Gary


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