[Lab] pumping water with heat?

Peter Sjoberg peters-modlab at techwiz.ca
Thu Feb 9 10:08:35 EST 2017

Dunno about size required or so but my parents house is an old house and
there the heat is waterbased radiators. The hot side is in the roof and
the cold side in the floor, in the middle a wood stove to heat it all
up. It worked fine when electricity was out, no problem as long as you
had some logs to burn.
To transfer that to your beer brewer, the radiator is then replaced with
your hose wrapped around the vessel and the stove with your heating
element (peltier or whatever), guess you just need to keep levels good
and make sure you don't heat it up to much since boiling it may not be
so good.
Unlike the house heating I guess you don't need a expansion tank but if
it's a lot of water it would be need one somewhere on the top of the
loop. Could be just an open tank where you also fill in more water as it


On 08/02/17 05:10 PM, Olaf Baumann wrote:
> I've just had an idea and I don't know if it would work.
> I'm wondering if it is possible to circulate water in a closed system by
> just heating or cooling.
> Imagine a hula hoop standing vertically and filled with water.  If I
> apply heat at the 3 o'clock position, would the water flow counter
> clockwise?  Then cool that same region to make it flow clockwise.
> Part of me thinks that it's too simple of a contraption to work but I
> can't think of any reason why it wouldn't.  Of course the 'pressure' or
> flow would be quite small and I'd have to keep the temperature safely
> between freezing and boiling to avoid ice jams and *explosions*.
> Then I can cut at 7 and 11 o'clock and add a long hose that I can wrap
> around my beer fermentation vessel inside of some insulation.  Add a
> peltier effect heater/cooler at 3 o'clock along with a PID and
> thermometer and I'd have a way to brew my beer with tightly controlled
> temperatures.  Target temperatures would be between 10°C and 25°C with a
> range one or two degrees.
> Probably a good idea to use some vinyl tubing instead so I don't ruin a
> perfectly good hula hoop.
> -- 
> Olaf
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