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View Full Version : A bit OT. Split case pump as turbine?



Forrest Addy
04-19-2011, 06:03 PM
Consider the vid:

http://www.youtube.com/watch?v=bRl0ztxn094

I dimly recall that using a split case pump as a turbine worked pretty well so long as you flipped the impeller.

Looks to me as though this installation used an induction motor as an induction generator.

So, Mr Spock. Comment? Analysis?

Forestgnome
04-19-2011, 06:43 PM
Now that was an ambitious project!. It's good to know there are people out there crazier than I am.

NzOldun
04-20-2011, 06:12 AM
Consider the vid:

http://www.youtube.com/watch?v=bRl0ztxn094

I dimly recall that using a split case pump as a turbine worked pretty well so long as you flipped the impeller.

Looks to me as though this installation used an induction motor as an induction generator.

So, Mr Spock. Comment? Analysis?


There is a great deal of info on very small turbines available, particularly for 3rd world usage. Very small ones tend to be pelton wheels because the high head, small flow gives a specific speed which fits into the area where pelton wheels give the best return.

NzOldun

Evan
04-20-2011, 10:15 AM
A friend of mine runs a small hydro generating system that supplies power to the town of Likely, BC which is about 90 km east of here. He uses induction motors as generators and pumps as turbines and has been doing so for many years.

http://www.smallhydropower.com

Weston Bye
04-20-2011, 03:14 PM
My son-in-law told me about one of the hospitals where he lives that uses hydropower generators running off the city water supply for emergency electrical power.

Seems that it could use a lot of water and deplete the city supply if a power outage were widespread and for an extended period of time.

Black_Moons
04-20-2011, 05:27 PM
Weston Bye: AFAIK most water stations have there own gas backup and are often at very critical/reliable/fastest reconnected parts of the grid. (So are hospitals, If you live near a hospital, expect the BEST power reliability and quickest reconnects after outtages) But it does seem a little short sighted to run a hospital off city water, Not because the city might 'run outta water', But because its still requiring an outside source that might fail during the same emergency (earthquake, Tsunami, military attack, etc), And is really just pushing the gasoline generators to pumping stations + inefficency of the pipes/etc.

Also, If there was some limit on water (Say, broken lines, But you still have water towers and other small localised reserves) those would be much better saved for drinking and fire fighting efforts.

If anything, I would consider such a system as the backup to the gasoline backup generators, Or *maybe* as a system that could be brought online within 1 second, or maintain an instantious flywheel backup system while the main generators take a few seconds to start up (And idealy, a couple mins to warm up before getting high load)