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re: greywater heat exchange
3 feb 2003
none wrote:
>>...i'm waiting for the 300' piece of 1" hose and the boatus item 168228
>>$20.99 attwood float switch and 10' of 1.125" id pvc hose, boatus item
>>218892 at $2.39/foot.
i actually ordered a cheaper 1.125" hose, item 218818 at $1.19/ft.
>i'm new to the thread but if i read one msg correctly you are planning on
>using a tank to hold water to salvage heat from.
righto.
>one major problem i see with this is that if you do not drain the drum
>between showers the water will be cold when you start.
got any numbers?
>which means your graywater will first have to heat the batch of water
>in the drum before it can start heating water going to your heater.
with no insulation, the drumwater might cool with a 12 hour time constant,
but it could be warmer than the cold water supply, esp the top layer, with
a combination of bouyancy and a 0.00554 ft^2/h thermal diffusivity... 60 f
water with a 100 f surface might cool to 80 f 1' below in 180x1^2 hours...
>a second problem i see with any of these systems is the fact that you are
>going to have to submerge a line carrying potable in a 'soup' that will
>contain everything from soap scum to skin to small amouts of fecal matter.
you poop in the shower? the line is pressurized...
>i see here you have a float switch which may mean you are planning on
>pumping the tank dry after each use which would help.
no. the float switch would be just below the upper edge of the drum.
nick
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