If the heating mechanism for a stirling engine is replaced with
compressed air, does the efficiency decrease that it is below the
conventional internal combustion engine?
- posted 15 years ago
Question: Stirling Engines
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- posted 15 years ago
I expect the efficiency rating you have in mind is the
thermodynamic efficiency, which might be expressed as
the amount of work I can extract divided by the amount of thermal energy I put in X100%
If you skip the thermal energy input then thermodynamic efficiency ceases to have meaning and you are left with some measure for mechanical efficiency which could be quite high I guess....
Brian Whatcott Altus OK
the amount of work I can extract divided by the amount of thermal energy I put in X100%
If you skip the thermal energy input then thermodynamic efficiency ceases to have meaning and you are left with some measure for mechanical efficiency which could be quite high I guess....
Brian Whatcott Altus OK
- posted 15 years ago
The reason I asked is as follows:
If I have a resovoir of air in a tank and use this in place of heated gas for the power cycle, would this be less efficient than just using a conventional intake-exhaust cycle motor for compressed air?
What I am trying to decide is whether or not a WEC that compresss air and converts this reserved energy into electricity is more feasible than other methods. The tank would act as a temporay storage until it passes through what ever conversion process is in place to generate electricity
If I have a resovoir of air in a tank and use this in place of heated gas for the power cycle, would this be less efficient than just using a conventional intake-exhaust cycle motor for compressed air?
What I am trying to decide is whether or not a WEC that compresss air and converts this reserved energy into electricity is more feasible than other methods. The tank would act as a temporay storage until it passes through what ever conversion process is in place to generate electricity
- posted 15 years ago
Storage with compressed air becomes a problem because the amount of
work required to pressurize the air as the tank pressure increases is
not a linear relationship. You are fairly limited in how much pressure
you can store in the tank and then extract without significant
inefficiency.
- posted 15 years ago
You must keep in mind that the ocean's waves have tremendous potential
for energy but capturing that energy is a problem. What I am looking
into is a closed system that recycles air (or another gas if need to
be) through the system to generate electricity. The storage would be
temporary and not a great amount since it would be replennished as long
as waves are present and large enough to move the compressing system.
When waves are small or not present then the system would have to shut
down until the wind blows again.
- posted 15 years ago
I believe there is a system exactly like this one in development. I
can't remember where I read about it, but they use the ocean waves to
compress the air and drive a turbine-powered generator.
- posted 15 years ago
This one I'm working on would be a closed system which could use other
gases if needed and would be coupled in with a wind mill and tidal
generator all in in unit. The tidal/current unit would be a constant
reliable source, wind turbine is proven technology but a wave energy
convertor due to the sporadic nature of a wave storm is the big
question.
- posted 15 years ago
Gotcha....sounds interesting
- posted 15 years ago
The tower for the wind and tidal mills would be a pipe sort of
arrangement which could house the generater/turbine and compressed air
storage tanks for the WEC. This is the crucial part of any
WEC--storing the energy in a form it can be controled and converted
into electricity. Since air has a small density, the weight of the
stored air wouldn't be as big an issue if a liquid such as water is
used. With a closed system, the problems with condensation and
corrosion can be minimized. Anyone with input into this concept is
welcome.
- posted 15 years ago
wrote
If it's a closed system, you might as well use dry nitrogen. Cheap, readily
available, and prevents any potential oxidation or moisture issues inside
your system.
Tom.
Tom.
- posted 15 years ago
Dear Tom Sanderson:
The only downside is that you will have a space that is deadly, if someone accidentally enters it. So precautions and training will need to be an established rule.
David A. Smith
The only downside is that you will have a space that is deadly, if someone accidentally enters it. So precautions and training will need to be an established rule.
David A. Smith
- posted 15 years ago
Another problem is wave size. Ocean waves in the area I have in mind
range from 0 to 30 feet or higher. Such a range would mean a very
small mean of sizes from which any device could capture energy. In the
lower range, a lack of energy is the problem while in the higher
ranger, preventing the device from being smashed would be the problem.
The solution I see is to have a floating system that could be moved and
re-connected to an under sea grid so the WEC would be in the limited
sizes of in which the device could work could be utilized at a higher
rate and place the device on a leeward shore when wave heights are
excessive.
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