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Re: Solar water heating system value - Page 45

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Posted by wmbjk on March 15, 2006, 12:51 am
On Tue, 14 Mar 2006 19:13:28 -0500, "Solar Flare"

Hmm, let's call it 60 feet of 1/2" copper pipe. Which holds .6
Imperial gallon of water, making your washer 2.4 gallons per fill.
What model would that be Gymmy Bob?


Posted by daestrom on March 15, 2006, 11:48 pm

Sigh... There you go using that durn 'math' again.  Just keeps conflicting
with what people just 'know to be true' ;-)


Posted by daestrom on March 15, 2006, 11:47 pm

Such splits don't have to be filled with hot water to run the washer.  They
just present slightly more surface area for cooling.  But then, if you
insulate the piping properly, this is a minimal affect.  Net result is, you
just have a slightly larger mass of copper to warm up along the way.

Actually, in my plumbing there are a couple of places where two 45 degree
angles, with five feet between them made more sense than a 90 and 7' of
pipe.  Admittedly this is rare, but that's why they make 45's.  So
professionals can use them when it makes sense.

Again, your 'take offs in between' don't have to be purged of water.  They
add very little to the calculation.  Less than one extra foot or two thermal
mass to warm up..

You have an unusual house if it's 50' as the crow flies between laundry and
HW heater.  My laundry's on the second floor and I've worked out the length
of piping as 27' along the pipe run.

Well, then *your* house is exceptional.  Maybe you should do something about


Posted by Doctor Drivel on March 14, 2006, 12:02 pm

European machines are far more energy and water efficient. They don't have a
large bath of water in them.  Water content in the most highly efficient is
very low these days.

Posted by Steve Spence on March 14, 2006, 3:13 pm
 Doctor Drivel wrote:

Well, that's a gross exaggeration, as we have energy efficient machines
here in the USA (modeled after the European ones, no doubt) that are
very close in efficiency. I have a Sears front loader washer that takes
1/3rd the electric and water of my previous unit.

Steve Spence
Dir., Green Trust, http://www.green-trust.org
Contributing Editor, http://www.off-grid.net

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