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26 janvier 2016 2 26 /01 /janvier /2016 17:55

One problem in our technologic world is that knowledge growth faster than our ethic.

 

In this article, I’ll try to fill the gap between my technological knowledge and my ethic about vehicles consumption. Hoping that in the same time, you will also learn something and develop a strong awareness.
Among many others, fuel combustion is the main waste in our society:
Imagine you’ve order a burger in fancy restaurant. When it’s coming you have to hurry and you can only have a bite and leave the rest. That’s approximatively what happens with vehicles. Why do we learn as child not to waste food and nothing about energy?


So what happens under the bonnet?

The oil is used in a thermodynamic 4 strokes cycle:


The piston goes down and the cylinder intakes fresh new air from the intake valve.
The piston compresses the air in the top of the cylinder.
Fuel is injected, burned and it heats the compressed air. It gives energy to push the piston and continue the cycle.
When the piston compresses again the cylinder, burned gases are purge by the extract valve.

 

 

Use science to see clearly

That’s how we basically the heat capacity of fuel into mechanical work.
The efficiency is obtained when we compare the energy that we can receive from heating the fuel and the mechanical energy (Work [Watt]*Time = Energy [Watt. Hour]). The efficiency of a heat engine is around 35%. In addition to this main source of losses, we have to consider: the idling, driveline, rolling and aerodynamic losses. At the end, the total percentage of energy use to move the vehicle is no more than 15%.


This is strongly wasteful and it seems to me not a scientific method when you try to increase the percentage of renewable energy and in the same time wish the growth of vehicle demand (20 million of new vehicles in China in 2014, amongst many of French, German and American brands)


But our individual responsibility if we know those vehicles are such inefficient, is to use them with frugality. How can we decently use a vehicle alone? A small car weight is around 1300kg, which leads for our approximatively weight of 80kg to an efficiency of less than 1%!


There are some simple alternatives, but so far immediate profits stuck us with this problem.

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15 janvier 2015 4 15 /01 /janvier /2015 15:41

During the first week-end of december, I went to a convention organized by an association called Christians and oil peak. it's a group of research about links between the ecological problem and the christianity.

I went there because I think that the confrontation of these both topics will lead to something unusual but rich.

 

The question that leads this association is "Which spiritual ressources to face up to the run out of natural ressources?"

 

The first speeche was told by Oliver REY, a searcher at CNRS and maths teacher. He spoke about the notion of scale in real world. We assume in our modern world that humain are able to do everythings thanks to technologies. But he said that it exists a scale for humain being. Indeed modern cities with huge supermarket, fast underground... aren't in the humain scale.Our humain size, our walk speed say something about our nature. To illustrate this notion of scale, he took the example of the size. If we were two times higher, we would be four times bigger, but our legs won't be able to support us anymore.He considered that we might come back to a civilisation at humain size.

One other topic was the necessity to associate again the "hard science" like maths or physics and "social science" like philosophy or litterature. The french university is divided into parts, but we have to consider ethic when we study law or engineering. Its a modern fact to dissociate subject and it's not obvious.

 

Of course, the political questions was broached. There was Mrs. MOREL DARLEUX, secretary of ecosocialism at Front de Gauche. She denounced the infinite growth in a finite world and said that fossil energy can be considered as drugs for the capitalism. Mr LEPESANT, a philosophy teacher, quite fun indeed, impressed me a lot. He perceived three main axes to transform our society. 1/ Give absolute priority to ecological questions. 2/Break off from our conception of illimited liberty, putting liberties after responsability. (He asked a question that interested me a lot: In our democraty, who represents the "missing" like future generations, animals,vegetals...) 3/Refind the taste of simplicity. He asked for a floor salary but associate with a ceiling salary. The reason for this requirement was "How can people can live together where there are so large gap of money between them?" He spoke about the concept of convivial cities where everyone lives at the same rythm than the poorest.

 

Another speeche was given by Mr. REVOL, a theologian and biologist at Catholic University of Lyon. He tryed to express the christian vision of the earth. How God makes us co-creator of this nature, and how the christian faith can help us to protect the environnement in changing our materialist and industrialist vision of the nature into love look.

 

I wasn't there during the two days but these speeches have been broadcasted.

You can heard them here:

http://www.chretiens-et-pic-de-petrole.org/colloque-2014/interventions/

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27 décembre 2011 2 27 /12 /décembre /2011 14:07

Better place is an american and israelian firm which has create a Exchange's system of cars'battery instead of recharge cars'battery.

This project is very ambitious because he wants to solve three of the mains problems of the next years:

 

  • The first problem this new solution deals with is the transport. Oil price are increasing and they won't stop. That's why we have to find new resources to continue to move as we do now. The electric cars seems to be today the best alternative and BetterPlace helps the electric car to win market share. Indeed this firm purposes a new solution that makes cheaper electric cars and faster the time of gaz up.

 

  • More over the electric car don't polluate when they go (even if it's not 0-emission at all because of the production). That's why the project better place helps the environnement in acting for electric cars. Preserving our environnement  may be the most important problem to solve during the next years.

 

  • Finally the third problem is How to stock electricity to use only renewable energy? That's a real problem with the solar panels because there is no sun during most of consumption's peak. Thanks BetterPlace and their tausend of car's battery, a huge capacity of stocking electricity will appear and will make sun energy easier to use.

This firm is already established in California, Danemark, China and Israel and the next video shows you how it's works:  http://france.betterplace.com/the-company-multimedia-videos-detail/index/guid/e1fd447c-f8c4-454e-b1a8-91af64410346 (Sorry but this video is full of stereotypes of the next american way of life...)

Could we be able to change our french habits now and pass on electric cars ?

 

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24 novembre 2011 4 24 /11 /novembre /2011 09:45

During the reading of the book called 100 pioneer for the planet which make a census of green solutions, I met severals time, the name of PELAMIS.

But what is Pelamis?

 

It's a new product who is able to transform waves into electricity. This technology is for me very interesting (it could be for me a field where i want to work as engineer) and i will try to explain more about it with the next lines:

A pelamis is a long snake from 150 meters long and 3.5 meters wide.

The wawes move cylinder who are links by piston. The movement of comings and comings press and pull these pistons and produce electricity. The following video give a good illustration: http://www.youtube.com/watch?v=F0mzrbfzUpM&feature=player_embedded

In my opinion this solution is today the best in the ecological point of view because it don't really disturb the wildlife and it doesn't have a big impact on the landscape.

I don't really know if this technology is cheap but just few information find on the net.

The price of the first pelamis farm in portugal cost 9 million euros to produce 2.25 MW (it's the electricity consume by 1500 family of middle consumption).

In comparaison the price of a nuclear power plant is  2.5 million euros to produce 1GW(1000MW) (source internet:http://www.leseoliennes.be/economieolien/investisscentrale.htm) (Mwh =power, Mw = energy)

Nuclear power is the cheapest and the most ecological anyway if we futfill to make it sure.

 

Anyway this wawe power solution should be improve in the same way than windmill which improve a lot of their technicals solutions to produce more energy.

 

 

To Finish more photographies on: 

http://www.pelamiswave.com/gallery?category=videos&page=1

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