Better efficiency in thermodynamics?

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harry ravi
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Better efficiency in thermodynamics?




by harry ravi » 19/08/08, 12:05

Among all the processes acquired and those under development, which is currently the process which offers the best heat / kinetic yield as well as the value of this yield and the conditions necessary to obtain it.
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by Christophe » 19/08/08, 12:36

There are 2 stand out:

a) Steam gas combined cycle turbine : 54% yield. Used in some modern gas plants, but still rare. In comparison, a nuclear power plant has an efficiency of 35%.

b) Very slow 2-stroke diesel engine :> 50% yield.

vincent27 wrote:No, the big slow marine diesel are those with the best returns.
On cruise ships, installing the electric diesel for reasons of comfort (vibration, noise, space allocation machine congestion).
On merchant ships, were now installs slow motors (2 time often) turns to 100 - 150 rev / min, developing 95000 CV and whose specific consumption is very low.

They burn heavy fuel oil, but current anti-pollution standards limit releases.
And heavy fuel oil is much cheaper vigorously to produce than diesel, which results in a large amount of scrap.

Finally, it means beautiful and grandiose machinery ...

Image

Site Quote:

The Wartsila "Sulzer" 2-stroke diesel engine is the most powerful and efficient in the world today. 965mm bore and 2489mm stroke.
Available 6 12 a cylinder in-line, which we made in the 21845 12 liters cyl.
12 version cylinders, the engine weighs more than 2000 tonnes (the
Crankshaft exceeds the 300 tonnes).
The maximum continuous power is 89640 100 CV r / min (in 12 cylinder version), the power delivered to the mini point of consumption is 53244 90 cv r / min. The cylinder has exceeded the 12 100000 cv during overspeed test (a 101,5 rev / min only).

diesel consumption max power is 0,126 kg / hp / hr (British Standard Fuel Consumption). diesel consumption in the economic point is 0,118 kg / hp / hour (BSFC).

The economic point, the Sulzer exceeded the performance 0,5. For comparison, automotive and small aircraft engines (a candle) have a BSFC consumption has 0,181 0,272 kg / hp / hour with a yield of 0,25 0,3 has

Even at its maximum efficiency, the Sulzer consumes almost 6284 liters of diesel per hour. "
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harry ravi
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by harry ravi » 19/08/08, 16:28

I'm not talking about fuel> kinetic conversion.


I have 1W of heat, how many W of kinetic energy can I get maximum with the practices that you know (steam turbine, stirling, seebeck, ...)?
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by Christophe » 19/08/08, 16:42

I just answered you ???

Otherwise sorry I do not understand the nuance ... since fuel + air = heat ...

:?: :?: :?:

Please be clearer
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harry ravi
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by harry ravi » 19/08/08, 17:04

I do not want to use fuels, it would not be economical
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by Christophe » 19/08/08, 17:28

Well, you had to specify it in your question, so don't guess!

But pkoi ca? Because there are some less dirty than others ...

You may well consider doing a cycle combined with gasification of wood ... even if do not think it has been attempted yet ...
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by harry ravi » 19/08/08, 22:59

No, it's more related to Rémundo's solar trap, I'm on top of it.

I wanted to know the yields that will be possible by passing the heat created by the solar trap in order to create kinetic energy.

According to some, stirling can only have (it's already not bad, I grant you) 50% of maximum output.

For fluid / compressed gas turbines, I do not know the possible yields.

For the Minto wheel, this has been very little experienced so we cannot really know.

For cells with seebeek effect, the yield is quite low (I no longer have the percentage in mind)

The goal is not necessarily to produce electricity but above all to have a driving force.
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harry ravi
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by harry ravi » 19/08/08, 23:16

I just saw an illustration on wikipedia "thermodynamics":

Image

It looks like stirling but imagine:

I take water at 20 ° C that I heat to 1000 ° C in a system close to the middle of absolute insulation, this water at 1000 ° C will enter the system if above so that naturally the cycle of vacuum will lower the temperature from 1000 ° C to 20 ° C.
Then the water will reinject it at the origin of the system.

We are talking about a system where the insulation is complete.

How could the maximum performance of this kind of system be?
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by Capt_Maloche » 13/08/09, 09:35

I return to the subject after coming across this article, similar to the first post on this subject:

The most powerful diesel engine in the world:
xelopolis.com/Xdossiers/dossier_1006_le+plus+pouissant +moteur+diesel+monde.html

The yield exceeds 50% !! and they do cogeneration on the exhaust, not bad

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by Christophe » 13/08/09, 09:40

Capt_Maloche wrote:The yield exceeds 50% !!


Well if I'm not mistaken, this is the case of all (very) slow (2 stroke) diesel for a while ...
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