Posted by Solar Flare on February 5, 2006, 12:43 am
How about just measuring the current draw of the pump
and sticking it into a chart to get the flow or
restriction rate? Math? I have no idea.
fittings into your
the pump? Place
before the pump, and
pressure drop. As
pressure change across
filtering, but the
noisy, how about
One transducer on
return pipe. I'm
as compared to
largest signal by
Posted by You on February 6, 2006, 7:53 pm
Finally, an ADMISSION, that "SolarFart" has no idea,
about ANY Math, involved in ANYTHING......
There you go, Steve and Wayne, direct from the
Posted by Mitchell Dickson on February 7, 2006, 4:28 pm
ROTFLMAO! First of all, what does it matter? Just install a thermostat to
cut the heat off if it gets too hot :) Other than that....................
Knowing the BTU draw or the math involved to arrive at it is "Dog Peter
Knats". Those are the little critters that orbit a dog's peter LOL!
Absolutely good for nothing, yet they exist :)
Posted by Steve Shantz on January 29, 2006, 8:53 pm
OK, to answer my own question... Omega has an interesting and cheap
($6) differential pressure transducer
(http://www.omega.com/ppt/pptsc.asp?ref=PX26 ) that could maybe be
plumbed across the pump. They come in a wide variety of pressure
ranges, down to 1 PSI full scale.
Posted by Gary on January 30, 2006, 2:55 am
I had a go at a flow meter made from two 3/4 by 1/2 CPVC reducers installed back
to back. Put pressure taps just upstream, and at the 1/2 inch section, and
measured the pressure difference with a water manometer. This seems to work
pretty well -- the pressure difference is proportional to the square of the flow
rate, just as the book says it should be!
Setup and pictures here:
Steve -- that Omega pressure sensor looks pretty good to me. Not being very
electronically inclined, I am wondering how to deal with the 16 MV per 1 psi --
but maybe thats easy?
The idea of estimating flow by measureing the drop across the collectors also
seems worth a try to me -- my water system is not done yet, so someone else will
need to give that a go.
"Build It Yourself" Solar Projects
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