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Hot waste water

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Posted by applepicker on February 16, 2007, 9:50 pm
Is there some type of device to generate electricity from large volume
waste hot water( 130.0 F)

Posted by DSL Usenet on February 18, 2007, 1:27 am
Sure... How much water? What's the air temperature?  Don't expect it to be
very efficient, but it'll be somewhat better that 0% which is probably what
you're getting right now.

Posted by applepicker on February 18, 2007, 1:50 am
200gpm at 130 to 135 f and the ambient temp is between 75 and 85

Posted by DJ on February 18, 2007, 2:32 pm

Well, probably nothing to get electricity from that level of heat as
such, no.

However, heat recovery, using something like the "Drainwater Heat
Recovery" thread talking about Powerpipes and such, is well worth
considering if you have a need for heat, and who doesn't? Hydronic
heating systems and potable hot water could both benefit from that
heat recovery.

Secondly, this 200 GPM... any pressure behind it, or height from
ground level involved? Because if there is, a conventional micro-hydro
water turbine could be plugged into it, and there could be substantial
power recovery there. You'd just need to check the engine run
temperatures on the turbines, to make sure you don't damage them, but
that's just simple mechanics.


Posted by daestrom on February 22, 2007, 12:41 am

At the very least, you could use it to warm up about 200 gpm of water :-)

Seriously, if this is discharge from some process where you heated the water
in the first place, a good heat-exchanger could be used to recover much of
the heat and thus reduce the energy needed to heat incoming water.

OTOH, if it's 'free' (say, a hot spring), then such a low temperature would
be best used for heating something.  Putting it into a heat engine will not
produce a lot of power.


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