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Solar wall heater?

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Posted by Tommy on August 9, 2008, 8:35 pm
I have seen several solar heaters which all seem to be fairly easy to
build. My question is has anybody know of one using water, anti-freeze,
or glycol?
Or perhaps dark or black thin stone or tile?

TIA, Tommy.

Posted by Morris Dovey on August 17, 2008, 1:19 am
Tommy wrote:

If you need hot water, then heat water. If you're heating an anti-freeze
mixture then you'll also need at least a heat exchanger of some sort,
and you'll probably (but not necessarily) need a circulator pump and a
control system of some sort.

If (and only if) you're collecting more heat than you need, some kind of
storage tank may make sense.

If you're not collecting more heat than you need, then you won't need to
store it.

If you're not heating water to use as hot water, then it may make sense
to use air as the collection media - even if you plan to store the heat.

In any case, accumulating/storing heat inside the collector is
counter-productive. You will have a more efficient system if you operate
the collector as the lowest temperature you can manage.

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

Posted by Tommy on August 19, 2008, 2:00 am
 Nobody will touch this wih a 10 foot pole LOL.

The wall heater would be a hybrd cross of a solar hot water heater, and
solar wall heater.

Posted by Cosmopolite on August 20, 2008, 12:24 am
 Tommy wrote:

   I think that Morris gave you some very good information to get you
thinking about your problem.

   On-line research should give you a lot more info. , about the
practicality of different systems.

Posted by Morris Dovey on August 20, 2008, 2:18 am
 Tommy wrote:

It's not so much untouchable, as lacking in definition...

You can only get so much heat into (and so out of) a given size solar
panel. You can use that heat to heat water and/or air, but heat that you
take out in water won't be available to take out in warmed air.

I've worked on a dual mode panel that could heat air and heat water, but
it'd only do one at a time. I stopped working on it when I realized that
it was much more economical to use an appropriate mix of water-only and
air-only panels.

FWIW, it appears that between (roughly) the Tropic of Cancer and the
Arctic Circle (or between Tropic of Capricorn and Antarctic Circle for
the southern hemisphere) a vertical panel delivers best performance for
space heating - and a tilted panel panel delivers best performance for
DHW. I would guess that between Tropics of Cancer and Capricorn a
horizontal panel would work best for DHW (and that there might not be
much need for solar heating <g>).

You might get more response if you provided a bit more information about
the specific goals you're trying to accomplish.

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

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