Grelinette wrote:
However, I would remind you that in December a conference should help to free oneself from thermal energy from petroleum, and keeping this energy as a reference will be more and more out of place.
Electricity, even if it is promising, is starting to worry because we still do not know how to store it efficiently, and some specialists are already alerting to the rapid scarcity of materials needed for electricity (rare earths).
Then the idea is to take a tool that has existed for over 100 years, and that some have brought up to date, and study it to see if we can improve it ... even if we suspect that we can never make it as efficient as a heat engine.
Exactly. If you situate the debate thus, a rarer energy, etc ... the question of the efficiency of the system, evoked above, and which you avoid (undoubtedly by "love of horses", which is respectable - I know passions more stupid!) becomes capital:
- if there are many men (which is the case)
- if almost all the land is cleared (which is the case)
- how can I, from one hectare, recover the most energy for my human needs (take the example of the video that you put online: sawing and splitting wood)?
a) by maintaining a horse, who will sometimes trample?
b) by installing a digester, which will methanize the plants produced on this ha, produce gas, storable, from which we will be able to produce electricity or movement (the saw and the splitter, instead of turning on horse or the petrol engine, could be powered by a group powered by gas!) or heat or a combination of these energies ...
Without having done any calculations, I think there is no picture, simply because the bacteria in the digester are infinitely more efficient than the big and heavy horse, which mainly talks about itself - and incidentally , delivers some work ...
So I think that the treadmill, from the perspective of a rare energy is a dead end.
Except for the horse lover, who anyway, "at a loss", not to mention, will maintain his horse (s) anyway. As already written, I respect.
And except certain spaces, limited but existing, difficult to exploit other than not "grazers / collectors": goats, horses, donkeys, etc ...
So I don't condemn the device.
I just think that it is necessary to realistically circumscribe the real potential ...
And I find it a shame to ignore the "yield" debate! Including for renewable energies - especially perhaps for these energies, rare! - the question of yield will become crucial in a finite world!
