alt.energy.renewable

"Father Haskell" wrote in message
news:0a382969-96ad-4216-bfb7-d3965da6352e@u72g2000hsf.googlegroups.com...
| On Mar 4, 4:30 pm, "Androcles" wrote:
| > "Father Haskell" wrote in message
| >
| > news:f5050aed-fded-4e32-9e3f-2b1773338ef9@d4g2000prg.googlegroups.com...
| > | On Feb 27, 10:38 pm, janpa...@gmail.com wrote:
| > | > Our scientists are so succesful in telling us that perpetual motion
| > | > generators cannot be build, that we are scared to even try to build
| > | > one.
| > |
| > | They can't.
| > |
| > | However, the next best thing would be a machine that outlasts
| > | us, such as a solar-powered steam turbine. It would be
| > | indistinguishable from a pmm, since no one would live
| > | long enough to see it run down.
| >
| > Why would one use steam when solar cells are readily
| > available?
| > http://apod.nasa.gov/apod/image/0605/iss2_sts114_big.jpg
|
| Which is more efficient given present state of development?

A heat engine is a physical or theoretical device that converts thermal
energy to mechanical output. The mechanical output is called work, and the
thermal energy input is called heat. Heat engines typically run on a
specific thermodynamic cycle.
Heat engines are often confused with the cycles they attempt to mimic.

The efficiency of various heat engines proposed or used today ranges from 3
percent (97 percent waste heat) for the OTEC ocean power proposal through 25
percent for most automotive engines, to 45 percent for a super critical coal
plant, to about 60 percent for a steam-cooled combined cycle gas turbine.
All of these processes gain their efficiency (or lack thereof) due to the
temperature drop across them.
http://en.wikipedia.org/wiki/Heat_engine

| As a nod to pv, connect an LED to a voltmeter. Point it
| at the sun. At noon, clear sky, the LED will easily put
| out in excess of one volt, though the current will be
| low.
|
| > But anyway, what's the big deal here?
| > You are saying (the equivalent of) a car engine will run forever
| > if you continue to supply fuel. It won't, it'll wear out. The PMM
| > has to run without energy input of any kind.
|
| Magnetic bearings.

This should be steam powered?
http://video.google.co.uk/videoplay?docid=2926400396387878713

Try one of these, dad.
http://www.science-engineering.net/