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I had a 3/4 horsepower pump that moved 13 gallons
per minute of water out of a 100' deep well, 40' head minimum.
It was a lot faster than that until I drew the well
down to it's production rate, but I only measured the production
rate.
Extrapolating from that, 3 horsepower will move 52+
GPM. Different kind of pump, different environment.
Data point.
Jack Ford
----- Original Message -----
Sent: Sunday, February 27, 2005 12:36
PM
Subject: [FlyRotary] Re: [FlyRotary]Belt
rumnations; soliciting Opinions of racers please....
Al,
I made a quick analysis from facts obtained
elsewhere. I surmised that PL was right about the 10 hp at high rpm
because I've heard that number from so many sources over the years. How
considerably off do you think PL was and why? I seem to recall that PL's
case against EWP was that since water pumps require 10 hp, you'd need a 10 hp
motor to drive the EWP. As for the 0.1 hp of EWP, I'm pretty sure
someone on this list that's using one reported that his EWP draws about 5 amps
in operation. Starting from there, the math is pretty
straightforward.
Anyway, I'm a believer until I hear something really
compelling ... Jim S.
Al Gietzen wrote:
The case for EWP for example is performance. PL insisted that an EDWP absorbs over 10 hp at 6000 rpm. He is probably damned close. He then made the unfortunate leap that therefore an EWP must absorb the same power. Not true. EWP conservatively absorbs 14V x 5 A = 70 W =~ 0.1 hp. He was off by about two orders of magnitude or about 9.9 hp. Don't know about you but I can always use an extra 9.9 hp. PL may have been considerably off; but at .1hp with the EWP you will be getting only a fraction of the flow of the belt driven pump; even if it were 100% efficient. Keep in mind that converting power into electricity is about 85% efficient, as is converting electricity back into power. 0.85 x 0.85 = 0.72; so you have lost 28% of the power in the process. Pumping coolant against even a small pressure head takes power. Any ‘performance improvement’ you may see with EWP vs belt driven pump comes from lower flow rate. Al >> Homepage: http://www.flyrotary.com/
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