Solar energy condensed or concentrated in hydrogen.
Keywords: hydrogen, H2, solar, thermal, photovoltaic, energy, clean, panels, solar, renewable, sun, ray, inexhaustible
Why is it interesting to concentrate or “condense” (abusive term) solar energy and more generally renewable energies?
There are two main reasons for this: a temporal cause and a physical cause.
a) Temporal cause.
The renewable energy production units are dependent on climatic hazards and especially day-night cycles. Thus, a renewable energy source is rarely at its maximum when it is needed the most ... Example: photovoltaic panels supplying light bulbs, at night they produce nothing (or almost). It is therefore necessary to be able to store this energy.
b) Physical cause.
All renewable energy sources (or almost) are diffuse energy sources, that is to say that their energy potential in relation to the collection surface is relatively low.
A simple calculation based on solar photovoltaic will allow you to see more clearly.
- an average solar panel m2 per year 1300 kwh thermal or 200 kwh electrical about. (see Deposit and solar potential in France)
- an average car (electric in this case) needs 0,15 mechanical kWh per km driven (based on fuel consumption equivalent to 6L / 100 and vehicle efficiency of 25%). Taking into account the efficiency of the electric motor (80%) it takes about 0,19 kwhe per km.
- Assuming no loss of storage in the batteries (the reality is quite different): one m2 of panel would therefore allow the storage car to travel 200 / 0,19 = 1052 km… or the equivalent of 63 L of fuel.
Why solar hydrogen?
In summary from the previous paragraph: 1 m2 of photovoltaic panel will produce, for an electric car, the equivalent of 63L of fuel over a year… This is a very long period for ultimately quite little energy.
The disadvantages of renewable energies explained by points a) and b) clearly show the interest of concentrating or condensing solar energy, especially since there are other disadvantages to renewable energies.
One of the most interesting ways to focus renewable energies is creation solar hydogen (from water most of the time) which no longer becomes a source of energy but a vector ...