Posted by Ulysses on April 8, 2009, 5:45 pm
They sell a complete 5000 watt steam powerplant for $200. Supposedly will
run from just about anything you have for fuel.
Posted by Ken Maltby on April 3, 2009, 5:04 pm
They can work, but I don't know for how long. I tried
it some time ago due mostly to a running discussion in this
NG. It worked, in that steam pressure off a pressure
cooker would get the motor going with some torque, (not
that much, but it could be usable). There were two things
that closed that approach (for now); One was the amount
of effort it was going to take to setup a working condensate
reinjection system (to recycle the feed water). But the real
killer was the noise.
I had the same noise problem with reversing a rotary air
compressor, it works fine but is too noisy to run any length
of time. I expect there would be some way to muffle the
really outragious amount of noise these rotary motors make,
but I couldn't find any that was simple enough for me to
implement that didn't also shut down the motor.
I expect that the same would be true for most steam
turbines, including the Telsa Turbine.
Posted by Ulysses on April 5, 2009, 5:04 pm
Ah. I bought one of those little air cutters from Harbor Freight for $ and
attached a small pulley and used it to drive a PMA. I got about 50 volts
but don't recall how many amps at about 70-80 psi. And it made quite a bit
of noise. I've since then used it many times to cut steel so it was worth
I don't think I've ever worked with air motors except the vacuum pump I
mentioned and it was very quiet but it was going in reverse so-to-speak.
The air tools used by auto mechanics can make a lot of noise but I think
those are generally a turbine and not a vane-type motor. I suspect much of
the noise is the air escaping so maybe they just need a muffler.
Posted by Eeyore on April 4, 2009, 3:24 am
Heat causes things to expand. I expect the vanes expanded more than the body so
Posted by Jim Wilkins on April 5, 2009, 1:39 pm
The reflectors on my solar water heater are flat panels approximately
the same size as the tank. It doesn't matter too much where the
reflected light hits the metal and they were easy to make out of
plywood, and strong enough to stand wind and snow loads. At night they
fold closed against the greenhouse glass to insulate it.
When the tank is empty the probe thermometer in the top of the tank
reaches about 190F. 40 gallons of water stabilize at 120 - 130 F.