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Can a Sterling Engine Generate Electricity?

Can a Sterling Engine Generate Electricity? - Physics Forum

Can a Sterling Engine Generate Electricity? - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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  #1  
Old 06-08-2008, 09:10 PM
Doug Wedel
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Default Can a Sterling Engine Generate Electricity?



You can obviously attach a pulley belt to a Sterling engine and hook it up
to some kind of dynamo. I'm just wondering about the physics.


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  #2  
Old 06-08-2008, 10:30 PM
Cork Soaker
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Default Can a Sterling Engine Generate Electricity?

Doug Wedel wrote:

What about the physics?
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  #3  
Old 06-09-2008, 01:18 AM
Doug Wedel
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Default Can a Sterling Engine Generate Electricity?


"Cork Soaker" <Thunderbird@Hardy.invalid> wrote in message
news:[Only registered users see links. ]...

Well, I heard the Stirling was the most efficient engine, and while I
realize it runs typically off much lower temperature differences than
electricity-generating turbine cycles, nevertheless, I wondered under what
circumstances if any a Stiring engine might offer a low temperature
difference heat engine approach to generating electricity.


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  #4  
Old 06-09-2008, 01:46 AM
Androcles
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Default Can a Sterling Engine Generate Electricity?


"Doug Wedel" <[Only registered users see links. ]> wrote in message
news:[Only registered users see links. ] m...
|
| "Cork Soaker" <Thunderbird@Hardy.invalid> wrote in message
| news:[Only registered users see links. ]...
| > Doug Wedel wrote:
| >> You can obviously attach a pulley belt to a Sterling engine and hook it
| >> up to some kind of dynamo. I'm just wondering about the physics.
| >
| > What about the physics?
|
| Well, I heard the Stirling was the most efficient engine,

You heard wrong or were told wrong. The engine works,
but it does not work efficiently.


| and while I
| realize it runs typically off much lower temperature differences than
| electricity-generating turbine cycles, nevertheless, I wondered under what
| circumstances if any a Stiring engine might offer a low temperature
| difference heat engine approach to generating electricity.
|
High temperature difference is the key to efficiency and has
been since steam boilers first blew up trying to attain it, there
is no way a reciprocating engine of any kind is comparable
to a turbine nor has there been since the jet engine replaced
the propeller.

--
Why did Einstein say
the speed of light from A to B is c-v,
the speed of light from B to A is c+v,
the "time" each way is the same?

1/2[tau(A)+tau(A')]= tau(B)
where
A = (0,0,0,t)
A' =(0,0,0,t+x'/(c-v) +x'/(c+v))
B = (x',0,0,t+x'/(c-v))
x' = x-vt

Ref: http://www.fourmilab.ch/etexts/einst...ures/img22.gif

"Easy: he did NOT say that." - cretin [Only registered users see links. ]
According to moron van lintel, Einstein did not write the equation he wrote.
Androcles


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  #5  
Old 06-09-2008, 11:37 PM
dlzc
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Default Can a Sterling Engine Generate Electricity?

Dear Androcles:

On Jun 8, 6:46*pm, "Androcles" <Headmas...@Hogwarts.physics> wrote:
...


Turbines for automobile propulsion had the difficulties of high
angular momentum, heavy gear boxes, and the huge amount of air they
had to move.

Do you think it is time for a resurgence here? With the variable
ratio, infinite range transmission, perhaps the "gyroscope effect"
will decrease. Match that with better electronics, better electrical
wheel drives, and elimination of the flywheel... seems like we could
scale them down...

David A. Smith
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  #6  
Old 06-09-2008, 11:50 PM
Androcles
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Default Can a Sterling Engine Generate Electricity?


"dlzc" <[Only registered users see links. ]> wrote in message
news:[Only registered users see links. ]...
Dear Androcles:

[snip]


Listen up, poof. I'm not your ****ing "dear" and it's high time you reported
yourself for the personal abuse you've been hurling at others, you poxy
snivelling hypocrite.

--
Why did Einstein say
the speed of light from A to B is c-v,
the speed of light from B to A is c+v,
the "time" each way is the same?

1/2[tau(A)+tau(A')]= tau(B)
where
A = (0,0,0,t)
A' =(0,0,0,t+x'/(c-v) +x'/(c+v))
B = (x',0,0,t+x'/(c-v))
x' = x-vt

Ref: http://www.fourmilab.ch/etexts/einst...ures/img22.gif

"Easy: he did NOT say that." - cretin [Only registered users see links. ]
According to moron van lintel, Einstein did not write the equation he wrote.
Androcles


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  #7  
Old 06-10-2008, 02:40 PM
dlzc
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Posts: n/a
Default Can a Sterling Engine Generate Electricity?

Hello Androcles,

On Jun 9, 4:50*pm, "Androcles" <Headmas...@Hogwarts.physics> wrote:

My apologies, Androcles. I had forgotten you do not like the common
greeting in use in the English language since before the time of
Newton.

Don't you think that it is time for turbines to be installed in
something like a hybrid car? Seems like it is a classical application
for an APU. Turbochargers show that manufacturers can get the small
geometries...

David A. Smith
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  #8  
Old 06-10-2008, 03:41 PM
Androcles
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Posts: n/a
Default Can a Sterling Engine Generate Electricity?


"dlzc" <[Only registered users see links. ]> wrote in message
news:[Only registered users see links. ]...
Hello Androcles,

On Jun 9, 4:50 pm, "Androcles" <Headmas...@Hogwarts.physics> wrote:

My apologies, Androcles. I had forgotten you do not like the common
greeting in use in the English language since before the time of
Newton.
=============================================
I do not wish to be greeted by you at all, it is superfluous. You
are not polite to others, playing games with greetings only stresses
your hypocrisy.
=============================================


Don't you think that it is time for turbines to be installed in
something like a hybrid car?
================================================

It's been tried in large trucks in the '60s, although why it failed is not
something I've looked into. Possibly because of maintenance issues
and the high gear ratio which is inherently inefficient, as with all
engineering
there are trade-offs between function, safety and cost.
Small turbines driving generators would possibly be an ideal replacement
in diesel-electric locomotives, for example, but an even better solution
would be to move merchandise by electrified rail instead of road, with
each vehicle controlled by a computer networked to the rail system
and having is own power unit. No more big trucks on the road, use
wind powered generators, delivery at night. Small cars that are parked
all night while we sleep and are parked all day while we work are an
inefficient stupidity beyond all reason, the rail taxi and the rail bus
(tram) controlled by a computer, call one up on your cell phone
when you need one would be far cheaper. The rails are empty, the roads
are full. Get rid of individual cars altogether, save them for race tracks,
demolition derbies and drag strips for those that want to risk their lives
just moving around at speed. Rail is much cheaper than road and
provides the extra function of automatic guidance, the only controls
needed are acceleration and switching before arriving at a junction,
which any computer can provide.
===============================================
Seems like it is a classical application
for an APU. Turbochargers show that manufacturers can get the small
geometries...
================================================
Well, there you have it. Any thrust from an APU is wasted energy,
the objective is to turn a generator. The inefficiency of the internal
combustion engine is the pumping of 4/5 of atmosphere (nitrogen),
through the system and heating it as goes. That applies to all
reciprocating engines and turbines alike. A wind turbine generator,
in the other hand, makes full use of the nitrogen. I'm not tree-hugging
green fanatic worried about global warming or pumping CO2
into atmosphere or any that shit, but when it comes to efficiency
I am first and foremost an engineer and I see the obvious solutions
to the obvious problems. Wherever you put a road you can put a rail
there cheaper. Keep death off the road, take away the ability to drive.
That would piss a lot of people off until they got used to it, then
they'd wonder how they ever managed without it.


--
Why did Einstein say
the speed of light from A to B is c-v,
the speed of light from B to A is c+v,
the "time" each way is the same?

1/2[tau(A)+tau(A')]= tau(B)
where
A = (0,0,0,t)
A' =(0,0,0,t+x'/(c-v) +x'/(c+v))
B = (x',0,0,t+x'/(c-v))
x' = x-vt

Ref: http://www.fourmilab.ch/etexts/einst...ures/img22.gif

"Easy: he did NOT say that." - cretin [Only registered users see links. ]
According to moron van lintel, Einstein did not write the equation he wrote.
Androcles


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