Comment They did it for the subsidy (Score 1) 74
The sums don't add up. Please feel free to correct me, because I'm getting numbers from Google mostly.
- To make 1Kg (14 litres) of H2 takes 50-55kWh of power.
- A single wind turbine (we are claiming it's green right?) makes at least 16mWh per day. 20mWh best case.
- So we're making 320Kg of H2 per turbine. 400Kg best-case
- Assuming the same energy density for volume as jet fuel, we'd need at least 30,000L.
- 30,000 / (14 x 320) = 6.7 (5.4 best case)
- That means we'd need 5.4 wind turbines at max output per day per jet flight.
- Except.. ..that energy density for H2 isn't the same, it's four times LESS, so we'd need 21.6-26.8 wind turbines. Per aircraft, per flight.
- Heathrow has 248 transatlantic flights per day, so best case we'd need 5,357 wind turbines, flat out, all day JUST for Heathrow.
- The UK currently has 11,500 wind turbines, so we either need to use 47% of the UK's current renewables to make H2 for Heathrow, or...
Kick these people to the kerb and stop funding snake-oil energy schemes.