| Topic: |
Science > Physics |
| User: |
"Richard" |
| Date: |
12 Jan 2007 10:42:51 AM |
| Object: |
Gas expansion turbine |
Whilst opening a plastic petrol can on a hot summers day I noticed it
released quite a lot osf pressurised gas.
Why cant this be developed on a scale large enough to run a gas
turbine, im sure there must be something that expands a lot better than
petrol.
On a cool night time you get a vacuum effect and could run the turbine
again.
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| User: "" |
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| Title: Re: Gas expansion turbine |
12 Jan 2007 10:55:03 AM |
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Richard <richard3009650@hotmail.com> wrote:
Whilst opening a plastic petrol can on a hot summers day I noticed it
released quite a lot osf pressurised gas.
Why cant this be developed on a scale large enough to run a gas
turbine, im sure there must be something that expands a lot better than
petrol.
On a cool night time you get a vacuum effect and could run the turbine
again.
Its been done and is called the steam engine.
Output power is proportional to the temperature difference, so though
you could make a freon engine that ran on the temperature difference
between sunlight and shade, you wouldn't get much power out of it.
--
Jim Pennino
Remove .spam.sux to reply.
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| User: "Puppet_Sock" |
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| Title: Re: Gas expansion turbine |
12 Jan 2007 11:13:45 AM |
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Richard wrote:
Whilst opening a plastic petrol can on a hot summers day I noticed it
released quite a lot osf pressurised gas.
Why cant this be developed on a scale large enough to run a gas
turbine, im sure there must be something that expands a lot better than
petrol.
On a cool night time you get a vacuum effect and could run the turbine
again.
Homework for you, since you asked the question:
Given a working area of 100 meters on a side, how much energy could
you extract from such a system? Make reasonable assumptions to get
a ballpark estimate. Look at daily changes in temperature for a few
representative days. Look up some ballpark values for transmission
of heat through pressurized surfaces that you would need to produce
any useful work. Presume an ideal gas law for your working material.
Like so: Say you could expect a 1 meter deep container of gas
to equalize by 5C within 12 hours. That changes the pressure in
the working volume by about 5/300 of it's one atmosphere. Work
out how much energy that gives you. Remember that it will be
at a high pressure to start, and then tail off. Make reasonable
estimates for what kind of efficiency you could get.
When you get some numbers, compare it to the solar flux, which
is round about 900 Watts/sq meter.
Socks
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