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Heat from the Shower Drain
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23
comments (23 topical, editorial)
Re: Heat from the Shower Drain
(
3.00 / 0
) (
#4
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by zeusmorg on Thu Dec 13th, 2007 at 12:28:28 PM MST
(
User Info
)
I'm actually in the process of building one, and I plan to document and record as much information as i can. From my research, vertical is the best system, because water spins down a vertical pipe and clings to the sides, partially due to the well known whirlpool effect (for you aussies that's counter-clockwise), and also due to adhesion, and surface tension properties of water. In a horizontal run this effect is cancelled, and the water runs along the bottom only of the pipe, reducing heat transfer due to less of the pipe having contact with the waste water, so in a horizontal run, your heat exchanger would have to be longer/bigger.
Hopefully I can exceed 50% recovery of the waste heat within the drain pipe itself, most studies I've seen the low recovery rates are 20-30%. Even that within a few short months would pay back the cost of building the heat exchanger, if you have high shower usage. Who wouldn't like saving over 25% of their cost to heat water? Especially if you're off grid, and have to pay high rates for your energy to heat it?
Heat from the Shower Drain
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23
comments (23 topical, 0 editorial)
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