Solar: Jean Luc Perrier, solar hydrogen production

[Ahmed]

Christophe, I found a source for you that explains the hybrid nature of Safra buses (those that run in Auxerre):
https://www.h2-mobile.fr/actus/bus-hydr ... ique-2024/
Including this extract which indicates:

2 modes of operation
This rear platform also has another utility: to consider different architectures of alternative energy powertrains. Hybrid, electric battery, electric with PAC H2, and even retrofitting: the specific elements are concentrated on the Energy Pack without having to touch up the rest of the vehicle too much. The Businova H2 can operate in 2 modes:
In Full H2, privileged, it is the fuel cell which is used in priority on approximately 350 km. The battery can possibly serve as a range extender for 90 km more. In this operating mode, the charge level of the lithium pack oscillates between 80 and 95%. Almost identical at the start and end of the day, so it does not require recharging the battery.
By classic electric bus. It is then the hydrogen cell which serves as a range extender. The overall range of action is unchanged, close to 450 km. However, in this mode it is necessary to recharge the battery during the night break.

[Remundo]

And also that hydrogen does not pollute by burning and yet some scientists write that it can have harmful effects and contribute to the greenhouse effect.

https://www.h2-mobile.fr/actus/hydrogen ... ntifiques/

I'm not too convinced of the greenhouse effect of H2 compared to the main GHGs (H2O, CO2, CH4)

but it is true that indirectly and in absolute terms, atmospheric H2 contributes to the greenhouse effect

[Christophe]

And also that hydrogen does not pollute by burning and yet some scientists write that it can have harmful effects and contribute to the greenhouse effect.

https://www.h2-mobile.fr/actus/hydrogen ... ntifiques/

Thank you for this reminder ...

An "indirect" greenhouse effect

"Hydrogen is actually a so-called" indirect "greenhouse gas and whose lifespan is very limited. When it is released, its power is two hundred times greater than that of CO2!", Affirms Steven Hamburg, scientist working for the Environmental Defense Fund, a non-governmental organization located in the USA. "Hydrogen is a gas as harmful as carbon dioxide because it increases the lifespan of methane in the atmosphere, which promotes the greenhouse effect. On the other hand, when it is in reaction , this gas forms tropospheric ozone, which also contributes to this greenhouse effect. Finally, the water vapor generated by the decomposition of hydrogen in the stratosphere also promotes this phenomenon, which is harmful for the climate. "

According to Ilisa Ocko, a climatologist working in the same organization as Hamburg, the power of hydrogen as an indirect greenhouse gas is such that it could ruin various efforts to decarbonize the planet. "Considering this negative impact of hydrogen on the atmosphere, its advantages over fossil fuels become more limited, even when it is generated with renewable electricity."

I don't know who spoke about it on the forum, you can be (?), but another source spoke of interaction between the "leaked" H2 and the free radicals of I do not know which gas dangerously increasing the greenhouse effect ...

They do not know how to make a model of the atmosphere these idiots of researchers?

An under-studied subject

"It is by rigorously measuring the percentage of hydrogen that leaks into the atmosphere that we can truly know whether or not it is dangerous for the environment", emphasizes Ilisa Ocko. "The problem is that the measurements carried out have too high a detection threshold. There is therefore an underreporting of leaks and we cannot currently know what the precise percentage is. We need to do more research on this subject. ... "