Stirling engine at home

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Did67
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by Did67 » 10/11/12, 14:36

chatelot16 wrote:

The only small turbine I saw is for the lighting of the steam locomotive ... turbine made a little like side channel pump: very bad performance ... acceptable because in a locomotive of a few thousand horses we do not care about the consomation of the lighting turbine


I saw a microturbine (well, a few tens of kW anyway) on Schnell cogeneration engines. Something crazy, at something like 50 rpm, to wring out the last watts, on the exhaust, after the turbo (it seems to me). This allows them to "scrape" around 000 kW electric on 15 kW electric groups (Scania 250-cylinder base).

This turbine is about as big as a blender Moulinex (or other brand)!

On the Schnell website: http://www.schnellmotor.de/sm/leistunge ... nenten.php

go to "Leistungen" then "Komponenten" and look at "Gasturbine".

I do not know the price of the jewel ...
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by chatelot16 » 10/11/12, 15:24

this turbine is not a steam turbine: it's much simpler: it's just a half of a turbocharger that drives a special alternator adapted to high speed

the turbocharger turbine works at a fairly low pressure, some bar, and with a fairly low relaxation rate

a good steam turbine is more complicated: high input pressure: at least 20 bar in my case, and much more in the thermal power plant, and it takes a great relaxation by a pile of successive wheel, until 0,05 bar at the exit

the shnell exhaust turbine could only be used for one stage of the entire steam turbine
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by chatelot16 » 10/11/12, 15:35

the great power of the turbine is a quality that becomes a disadvantage when we want to make small

this schnell turbine is small enough for 15kw

to make a steam turbine 1kw it would take several dozen floors in series, so each floor would be just about ten watt, so tiny ... and more is small plus it must turn quickly

it is certainly not impossible but there would be a huge study work and the cost price would be astronomical

a conventional piston engine is simpler to study ... it can be rotated at a convenient speed for the 3000t / min alternator

a piston engine can have a great relaxation in a single piston: a double or triple expension is enough ... no need for as much floor as in a steam turbine
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by Alain G » 10/11/12, 17:37

The only way to get 15 kwatts with this turbine is to operate at very high voltage which means converting this voltage to DC and then waving to AC to allow a transformer to reduce it, which is almost impossible to do directly given the speed of rotation.


Two or three twin turbos and gear reducers and a larger alternator could work with dry steam.
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by chatelot16 » 10/11/12, 18:12

you want rather high frequency than high voltage

of course you have to correct the high frequency and use an inverter to do the usual 50Hz, but it's not a big problem: it is common in the inverter genset: there is a permanent magnet alternator a large number of XNUM polesXLighter than conventional alternator

to put more than one turbine of this kind in series to use the steam is perhaps a solution

when different turbine stages are on the same tree everything has to be well studied to be effective at the same speed

with several turbines and each their alternator, we can focus by choosing the speed of each turbine
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by Alain G » 10/11/12, 18:27

chatelot16 wrote:you want rather high frequency than high voltage

of course you have to correct the high frequency and use an inverter to do the usual 50Hz, but it's not a big problem: it is common in the inverter genset: there is a permanent magnet alternator a large number of XNUM polesXLighter than conventional alternator

to put more than one turbine of this kind in series to use the steam is perhaps a solution

when different turbine stages are on the same tree everything has to be well studied to be effective at the same speed

with several turbines and each their alternator, we can focus by choosing the speed of each turbine



Chatelot Hi!

I mean high voltage and also high frequencies that can not easily reduce the voltage directly!

But ultimately it is an error on my part because in an automobile amplifier we use the high frequency to increase the voltage of 12 volts required to power strong wattage.

It is about using the least amount of turns possible in the transformer but it remains difficult to high voltage!
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by Alain G » 10/11/12, 21:46

I forgot to mention that the higher the number of turns in a transformer the lower the allowable frequency.

Here!
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by dedeleco » 11/11/12, 15:48

Just build or wind an alternator adapted to the turbine speed and power according to the laws of electromagnetism dating from Maxwell in 1865.
If the rotation speed is very fast, a magnet rotating in front of a single coil (for example at 50 revolutions / sec) with few turns of increasing size as the power extracted, will work.

The voltage is proportional to the number of turns multiplied by the speed and section area of ​​the coil, and therefore it is easily adjustable.
The current is limited by the resistance of the coil which forces large volumes of copper for high power.

It will remain a serious problem of mechanical balancing, with a single coil.

This was written by Maxwell and not by dedeleco, who does not go out of insults like Alain, who thus showed his mentality !!
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by dedeleco » 11/11/12, 17:25

Just build or wind an alternator adapted to the turbine speed and power according to the laws of electromagnetism dating from Maxwell in 1865.
If the rotation speed is very fast, a magnet rotating in front of a single coil (for example at 50 revolutions / sec) with few turns of increasing size as the power extracted, will work.

The voltage is proportional to the number of turns multiplied by the speed and section area of ​​the coil, and therefore it is easily adjustable.
The current is limited by the resistance of the coil which forces large volumes of copper for high power.

It will remain a serious problem of mechanical balancing, with a single coil.

This was written by Maxwell and not by dedeleco, who does not come out of insults like Alain, who thus shows his mentality !!]
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by BobFuck » 11/11/12, 18:23

Alain G wrote:The only way to get 15 kwatts with this turbine is to operate at very high voltage which means converting this voltage to DC and then waving to AC to allow a transformer to reduce it, which is almost impossible to do directly given the speed of rotation.


http://www.aeristech.co.uk/technology-- ... es-it-work
http://www.aeristech.co.uk//userFiles/a ... after2.pdf

The concept of the electric turbo is in fashion, Valeo gets started, they are not the only ones. In a car :

engine -> exhaust -> turbine -> alternator -> electronics and batteries -> electric motor -> turbo -> intake

It is supposed to remove the delay of the turbo and save a lot of fuel.

Features:

15 kW.
180000 rpm
A few pounds, a few hundred euros (in volume).

http://www.cpowert.com/
http://www.sae.org/mags/aei/11244/
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