The Red Brick Times

From ecoglobe :

Basic figures (approximations) for hydrogen energy used for a hydrogen fuell cell - electric car in comparison with petrol powered piston engin car:

(1) Solar panels (Photo Voltaics) can generate electricity at 90 - 100 Watt per square meter. In other words, 10 square meter of solar panels can produce 1 kWh of electricity in one hour.

(2) Producing 1 cubic meter Hydrogen gas costs 4 kilowatthour, by means of electrolysis of water.

(3) Therefore the production of 1 m3 hydrogen gas requires 40 m2 of solar panels.

(4) One cubic meter of hydrogen gas at normal temperature is equivalent to one litre of liquid hydrogen at minus 253.6 degrees centigrade: 1 m3 H2G = 1 L H2L.

(5) The energy contained in one litre of petrol is equivalent to 10 kWh electricity (at 100 % conversion efficieny).

(6) Petrol consumption of a small passenger car: 7 L /100 km = 6.7 kg / 100 km

(7) Hydrogen: 1.8 kg H2L = 25 L H2L (density: 70 gram/L)

(8) The energy contained in 6.7 kg of petrol is equivalent to the energy of 1.8 kg of liquid hydrogen, or 25 litre H2L, or enough for 100 km.

(9) At current market conditions one litre of liquid hydrogen (H2L) costs SFr. 4.00 (US$ 2.70). At a consumption of 25 L H2L / 100 km the fuel costs will be SFR.100.00 / 100 km (US$ 67.50)

From Me:
Note: That means you pay $67.50 for the hydrogen to travel each 60 miles.

Of course, not everyone wants to erect 40 square meters of photocells. That's a square array about 64 feet per side. Some will specialize in photo-farming. Each acre can hold about nine such arrays. They will work better in Flagstaff than in Cleveland. And all trees will be cut down, all vegetation cut off from sunlight, all rainfall diverted to holding tanks to provide raw material for hydrogen production. The more complications added, the higher the total costs will be. TANSTAAFL (there ain't no such thing as a free lunch).
Posted 9:03 AM by Andy (0) comments

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