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Author Topic: simple heat exchanger ideas for wood stove flue pipe  (Read 34254 times)
Baz
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« Reply #15 on: December 15, 2010, 08:55:35 PM »

It will work, but not very well as the hot rising water will keep bumping into the cold down flow. You might even get boiling at the bottom and cause hammering. However all you need to do is add a plastic pipe down the middle and the flow will separate and all work fine.
In steam boilers they are called 'field tubes'.
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billi
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« Reply #16 on: December 16, 2010, 04:30:57 PM »

thanks ......

so you mean a tube in the water-filled steel tube will work better ?

Or will a U shaped pipe work as well in the flue and ending in the header tank  at different heights ?

Thanks Billi

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1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
Baz
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« Reply #17 on: December 16, 2010, 04:54:04 PM »

Yes. A U tube is best and gives more surface area but following your initial line the inner plastic pipe would contain cooler water as the outside warmed up so promoting a natural separation of flow.
There is an old child's science trick.
Place candle stub in bottom of wide necked bottle and light (somehow). It will soon go out. Then repeat with a short piece of cardboard set vertical in the neck to provide separate in and out routes and it will stay alight. (not tried it - very 'Victorian' parlour trick for Dads to provide educational entertainment before invention of x-box)
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Ivan
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« Reply #18 on: December 22, 2010, 11:14:50 PM »

You mean there's educational entertainment available for x-box?!
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billi
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« Reply #19 on: December 22, 2010, 11:27:19 PM »

My sechsy wife is a bit worried about me ,  i drilled 3 holes  already into our stove  for experiments  hysteria

But still u tube  rules as an idea
« Last Edit: December 22, 2010, 11:47:38 PM by billi » Logged

1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
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