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re: greywater heat exchange
4 feb 2003
none wrote:
>> you might predict the average drumwater temp (68.7 f?)...
>i could predict average drum temp of 55.5f...
with a perfect heat exchanger, the drumwater might be 110 f at the top
and 55 at the bottom.
>...but it would be more of a guess than a predication. w/o experimentation
>i don't have any numbers, just assumptions.
and settled science, a few hundred years old :-)
>> what's your simpler design?
>
>take a length of soft copper pipe and loosely wrap it around something to
>form a coil. place this coil inside a length of pvc pipe then run your
>shower drain into the system. by using two traps you can allow the pipe to
>fill while the shower is running allowing the entire surface area of the
>copper to be in contact with the water. assuming you are using a 4" pvc pipe
>you can put a 4 x ½" (or smaller) y below the second trap which will allow
>the exchanger to fill during the shower but to empty after the shower is off.
sounds fine in principle, like micro-hydro using rainwater from a roof.
>if you made it long enough i'd think, guess, you could get output water
>almost as warm as the gray water input water.
how warm is almost, and how long is enough?
nick
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