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Home > Archive > Alternative Power sources > August 2007 > Re: Recuperate some of the heat from a group of showers
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Re: Recuperate some of the heat from a group of showers
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| On Aug 31, 2:25 pm, "daestrom" <daestrom@NO_SPAM_HEREtwcny.rr.com>
wrote:
> <nicksans...@ece.villanova.edu> wrote in message
>
> news:fb9ibt$nv7@acadia.ece.villanova.edu...
>
>
>
> Are you saying it uses 86 W * 24 hours =>2064 watt-hours to move those 96
> gpd? So with a float switch it would run only 64.3/97*24= ~16 hours a day
> and use just 1368 watt-hours a day?
>
> Seems a bit much (about $0.20 worth of electricity a day).
>
> daestrom
But what is the temperature of the greywater when it leaves the
building without a heat exchanger? Even with no fancy heat exchanger,
much of the heat of the shower drain water is given off by the drain
pipes in to the building environment. Also much of the inital heat is
given up in the shower itself heating the walls and evaporating the
water into vapor. I'm going to guess that the economics of this shows
that there is no payback.
Mark
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| clare at snyder.on.ca 2007-08-31, 5:25 pm |
| If you understand the single wire alternator you realize it can NOT
function without a battery. The "tickler" just turns on the solid
state regulator which feeds battery voltage to the field. When the
alternator stops turning, the "tickler" no longer has a signal so the
field current is shut off. I have yet to find a single wire alternator
(or any other kind) that will produce power into a load with no
battery attached. This is NOT to say they do not exist - but in almost
40 years of experience with automotive type alternators I have yet to
find one.
--
Posted via a free Usenet account from http://www.teranews.com
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| nicksanspam@ece.villanova.edu 2007-08-31, 5:25 pm |
| Mark <makolber@yahoo.com> wrote:
>... Even with no fancy heat exchanger, much of the heat of the shower drain
>water is given off by the drain pipes in to the building environment.
Not in most houses, I ween. But in some, the house heats the cold water pipe
significantly before it enters the water heater...
>... Also much of the inital heat is given up in the shower itself heating
>the walls and evaporating the water into vapor.
http://www.sunfrost.com/efficient_shower.html
Nick
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