Choose a hydraulic micro turbine: Pelton or propeller?

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Christophe
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Re: Choose a hydraulic micro-turbine: Pelton or propeller?




by Christophe » 17/06/16, 13:24

Yes, it is consistent if we consider the efficiency of the Pelton turbine identical regardless of the diameter of the jet / nozzle ...

What is approximate AMHA! My turbine lessons are far away ... but still ...

The efficiency of 90% of a Pelton is given for a UNIQUE speed and jet diameter = one pressure and one nozzle section = the ideal pressure for which the buckets were designed ...

After we can always try to vary the nozzle, but the results may be disappointing ... Inquires may be in which pressure adjustment range and nozzle EDF Pelton vary ... In my opinion not much: the engineers must rotate it as much as possible at the ideal setting.

You did not answer my question: why do you want to install a pelton so much? In your case, low height, a propeller turbine will be much more efficient ... in recovered energy

If I were lucky that you have such a tank near my home: I won't even look at the pelton ...
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Re: Choose a hydraulic micro-turbine: Pelton or propeller?




by Christophe » 17/06/16, 13:27

izentrop wrote:Lilian, and the pressure drops? you did not see the link on https://hydroturbine.info/ ? The electricity recovered is euro cents.


Well I think our knight has a fixed idea there ... : Cheesy:
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Re: Choose a hydraulic micro-turbine: Pelton or propeller?




by izentrop » 17/06/16, 13:41

Christophe wrote:why do you want to install a pelton so much? In your case, low height, a propeller turbine will be much more efficient ... in recovered energy
Maybe for big machines energies-renewable / select-a-micro-turbine-hydraulic-pelton-or-a-helix-t14812-30.html # p305647
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Re: Choose a hydraulic micro-turbine: Pelton or propeller?




by chatelot16 » 17/06/16, 13:42

it is not by seeking what is said that we understand ... it is by seeking why!

why is the peleton good for high pressure? answer because you need a fairly fine jet compared to the size of the wheel

the flow rate determines the diameter of the jet ... if the flow rate is large you need a large wheel and this is only valid for high pressure ... if the flow rate is low we make a reduced model of peleton and it is valid at low pressure, even if the books on large turbines we forgot to say
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Re: Choose a hydraulic micro-turbine: Pelton or propeller?




by Christophe » 17/06/16, 13:57

chatelot16 wrote:if the flow is low we make a reduced model of peleton and it is valid at low pressure, even if the books on the big turbine we forgot to say


I present to you chatelot who wants to rewrite the physical laws of hydraulics : Mrgreen:

Finally, you have to keep reason!

Now do what you want, install pelton for 10 or 20 m of fall ... but do not come to cry after the production is much less than what the seller (Chinese) promised me ... I have given enough info in this sense, especially the 2 .pdf above ... : Cry:
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Re: Choose a hydraulic micro-turbine: Pelton or propeller?




by Christophe » 17/06/16, 14:08



This design, which I already had a long time ago, is not terrible and imposes heavy work of civil engineering ...
Where did you see that the yield was 25%

According to the table:

Fall height under the turbine: 2,50 meters
Required water flow: 35 to 45 liters of water per second
Rated Power: 500 Watts


Take the worst case (highest hydraulic power): https://www.econologie.com/calculer-puis ... chute-eau/ gives a gross hydraulic power of 1100w

To draw 500W is not so bad it is 45% overall efficiency (turbine output = 60-70% and generating efficiency = 80-90% .. so it corresponds to 45% ...)

A Pelton with 85-95% efficiency is ONLY the efficiency of the turbine ... and the efficiency of the alternator will be optimum only for a fairly small range of rotation speed! I am sure that EDF regulates the speed of its Peltons so that they run on a multiple or sub multiple of 50Hz depending on the number of poles of the alternator and in order to avoid further losses in "current processing. "...

Again, this goes to my point: a turbine must be sized for a constant drop and flow to operate optimally ... even if adjustments are possible ...
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Re: Choose a hydraulic micro-turbine: Pelton or propeller?




by chatelot16 » 17/06/16, 14:11

it's not me who invented physics ... introduce me to the physical law which prohibits making a good reduced model peleton!

for me it is simple so that the peleton is good it is necessary that the jet is small compared to the diameter of the wheel ... the smaller the wheel the more it can work with a small jet with less strong pressure than the large ones
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Re: Choose a hydraulic micro-turbine: Pelton or propeller?




by lilian07 » 17/06/16, 14:34

so of course ... I take a 50% loss .... and unfortunately I know it's pennies .... I count 6 Kwh / 24 h over 8 months a year ... for a total investment at 400 euros .... it is a profitable project in less than 4 years and achievable without too much input ///
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Re: Choose a hydraulic micro-turbine: Pelton or propeller?




by Christophe » 17/06/16, 14:42

Why always talk so much about profitability when you have an energy project?

Producing your own green electricity ... it is priceless!
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Re: Choose a hydraulic micro-turbine: Pelton or propeller?




by Christophe » 17/06/16, 14:43

chatelot16 wrote:... present me the physical law which prohibits to make a good reduced model peleton!


I did not say that it was prohibited ... everything is possible ... but it is not the best hydraulic solution.
That's all!

Read the 2nd .pdf that I put above!
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