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Message from discussion Building a DIY solar heater for the garage
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David WE Roberts  
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 More options Nov 20 2011, 5:55 am
Newsgroups: uk.d-i-y
From: "David WE Roberts" <nos...@btinternet.com>
Date: Sun, 20 Nov 2011 10:55:30 -0000
Local: Sun, Nov 20 2011 5:55 am
Subject: Re: Building a DIY solar heater for the garage
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"NT" <meow2...@care2.com> wrote in message

news:676f9a31-2198-42c2-bb16-5ada1bc5aeb2@p5g2000vbm.googlegroups.com...
On Nov 19, 6:25 pm, fred <n...@for.mail> wrote:

> In article
> <1kaz59f.1a03sgkic99fkN%real-not-anti-spam-addr...@apple-juice.co.uk>,
> D.M. Procida <real-not-anti-spam-addr...@apple-juice.co.uk> writes

> >There's no heating in the garage, but there is damp.

> >On the other hand, it does have a nice large south-facing roof, so I
> >want to have a go a building a solar heater.

> >I have in mind a wooden frame, containing a long folded tube behind a
> >double-glazing panel and backed with a reflective surface.

> >The tube would be a long series of aluminium drinks cans, painted matt
> >black.

> >The will have ducts to the garage; one to draw cold air out of it, and
> >the other to bring warm air from the heater back in.

> >A small solar-powered fan would draw air through the tube.

> >I've found several descriptions of such projects, and their success.

> >Using air rather than water seems much simpler than trying to make a
> >system that uses water to transfer the heat, while using empty drinks
> >cans for the tube would help keep weight down.

> It might be nice to add some thermal mass to the system so that heat
> collected during the day could released at night when condensation is
> more likely. Using water as a medium with an insulated cylinder for
> thermal storage might provide that for you. Circulation by convection.

*Yes. But thats a costly way to do it.
*You also cant have circulation by convection when the heat source is
*on the roof.

For some values of can't - if the heat exchanger is on the lower 2/3 of the
roof and the water tank is in the top 1/3 then there will be limited gravity
circulation.
However you are then potentially looking at a strange hot water tank - a
long thin cyclinder?
Not the easiest and simplest way of doing things, and you also have to worry
about freezing during long periods of no sunshine.
However an electric water pump driven by a solar panel could be an
alternative to the electric air pump to give a pumped hot water system with
all the components more or less level with each other.
I think this is how some solar water heating systems work.
Of course you would also need a pump to circulate the stored heat - and what
is going to power that?

--
No plan survives contact with the enemy.
[Not even bunny]

Helmuth von Moltke the Elder

(\__/)
(='.'=)
(")_(")


 
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