Capt_Maloche a écrit :jonule a écrit :mais il faut admettre que suivant le gaz fourni, à débit égal il n'y aura pas la meme puissance dévellopée.
car il y a bien une forme d'hydrogène + exposive que l'autre !
Prouve le :
L'AIR LIQUIDE a écrit :Les valeurs pour l'hydrogène de gazeux sont exprimées à l'état stable à 75 % d'orthohydrogène et 25 % de parahydrogène.
ç'est le produit de toute électrolyse standard,
alors comment peux tu dire que les pingoins qui publient leurs vidéos sans données peuvent produire un gaz plus énergétique?
Et pour que tout le monde sache de quoi tu parles (je ne dis pas que ça n'existe pas, mais renseigne nous) donne nous le pouvoir calorifique du para et de l'ortho hydrogène, si tant est que quelqu'un ait pu les séparer ou les produires séparemment, ce qui nous interresse dans ce cas
L'orthohydrogène est très énergétique:
Jan. 11, 1966 5.1.. RUSKIN PROCESS FOR THE CONVERSION OF HYDROGEN Filed May 28, 1958 N 0 p 7 n a Il w M 5 A M H C 1 mm u l n L Q I L 1 i u U mw INVENTOR Suva/V L /1 y ,4 rrolpmsys United States Patent 3,228,868 PROCESS FOR THE CONVERSION OF HYDROGEN Simon L. Ruskin, New York, N.Y.; Dan Ruskin, Milton Reder, and Carol Fahri, executors of said Simon L. Ruskin, deceased Filed May 28, 1958, Ser. No. 738,573 2 @lairns. (Cl. 2tl430) My invention relates to missile fuels, more particularly to hydrogen employed as a propellant. While hydrogen has been recognized as a near ideal propellant, it has many drawbacks, particularly the hazards of premature explosion in handling and in discharge. To overcome these dangers, the unstable orthohydrogen is catalytically converted to the more stable parahydrogen. However, parahydrogen shows a surprisingly low rate of evaporation as well as a lowered reactivity, making it much less desirable for a missile fuel. For a missile fuel it is desirable to have the hydrogen in the atomic rather than in the molecular state, particularly not in the parahydrogen state. It is important therefore to resolve this dilemma if a safe and useful missile fuel is to be secured.
I have found that the conversion of parahydrogen to orthohydrogen can be rapidly accomplished in the missile itself during the act of discharge so that the combined benefits of safe handling and high thrust capacity is retained. While the conversion of parahydrogen normally begins at 500 C. and its rate increases rapidly as the temperature is raised, this conversion does not occur rapidly enough at the moment of firing with great loss of initial thrust. While various chemical catalysts have been tried, it has been found that the rate of catalytic conversion is much too slow for a missile fuel. It is thus of great importance to be able to rapidly convert parahydrogen to orthohydrogen. The reaction is an exchange type proceeding as follows:
in which a free hydrogen atom enters a para molecule leading to the production of an ortho molecule and the liberation of a second free hydrogen atom.
Thus it is essential to convert an equilibrium mixture to a non-equilibrium mixture since in non-equilibrium mixtures of hydrogen (or deuterium) the concentration of hydrogen atoms (or deuterium atoms) is higher than in the equilibrium mixture. To secure this conversion, it is necessary to change the energy of interaction between nuclear spins. The molecules of the two gases, para and ortho hydrogen differ in the relative orientation of the nuclear spins of the two proton-s. In the para molecules the spins of the protons are anti parallel; in the ortho molecules they are parallel. The para molecules occupy the even rotational levels, the ortho molecules the odd rotational levels. Under ordinary circumstances, no transition or conversion occurs from the para state to the ortho state or vice versa. Above about 250 K. the ratio of para to ortho molecules at equilibrium is independent of temperature and is 1:3. In the case of heavy hydrogen, there is also para and ortho modification due to the diiferent value of the nuclear spin of the deuterium nucleus, the para ortho ratio is however 1:2.
When a hydrogen molecule collides with a para magnetic molecule there is a certain probability that a para ortho transition takes place. Parahydrogen with its 0pposed nuclear and electron spins is diamagnetie whereas orthohydrogen in which the electron spins are opposed has nuclear spins which have the same relation for both atoms and is paramagnetic.
http://www.google.com/patents/US3228868
Si de l'hydrogène est stocké,il y aurait avantage à le convertir en orthohydrogène.
Les aimants posé sur une durite de gazole semble fonctionner sur ce principe(?)
C'est donc avantageux de produire et d'utilisé directement l'hydrogène d'une électrolyse si l'instalation est bien maîtrisé.
( trop cher, en plus )