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Biofuels & Petro-fuels = Liquid Fuels (Part Two) by afew on July 13th, 2006, has lots of data on first-generation biofuel yields. (3000 litres per hectare seems like a sensible estimate - I must be off by a few zeroes in my estimate for algae).

We have met the enemy, and it is us — Pogo
by Migeru (migeru at eurotrib dot com) on Thu Oct 25th, 2007 at 05:53:14 AM EST
[ Parent ]
Using incident solar power numbers from wikipedia, puts Europe at something like 150W/m^2 average for the year.

At 8% conversion efficiency:
150*0.8*365*24*60*60 = 378,432,000 J/(year*m^2)
For disel, 11kWh/L = 11000*60*60 = 39,600,000 J/L
So, per square metre disel equivalent yield per year:
378,432,000/39,600,000=9.6L/(year*m^2)
or 96,000L/(year*hectare)[sounds like a lot more than 3000. Do I have an extra zero??]

The EU used 494616 kTOE in 2005
In joules: 494616*1000*42e9 = 2.0774e19 J
Which, converted to diesel litres is: 5.2459e11 L
Per percent replacement: 5.4645e8 m^2
or 54645 hectares per percent replacement of 2005 fossil fuel usage.

by someone (s0me1smail(a)gmail(d)com) on Thu Oct 25th, 2007 at 06:43:05 AM EST
[ Parent ]
I think either kcurie's solar energy figure or my interpretation of it were off by a factor of 1000, which is not entirely surprising given the ambiguity in the meaning of the word "calorie".

Calorie - Wikipedia, the free encyclopedia

The calorie was never an SI unit. Modern definitions for calorie fall into 3 classes:

  • The small calorie or gram calorie approximates the energy needed to increase the temperature of 1 gram of water by 1 °C. This is about 4.184 joules.
  • The large calorie or kilogram calorie approximates the energy needed to increase the temperature of 1 kg of water by 1 °C. This is about 4.184 kJ, and exactly 1000 small calories.
  • The megacalorie or ton calorie[citation needed] approximates the energy needed to increase the temperature of 1 tonne of water by 1 °C. This is about 4.184 MJ, and exactly 1000 large calories.
Did I tell you I like TribExt?

We have met the enemy, and it is us — Pogo
by Migeru (migeru at eurotrib dot com) on Thu Oct 25th, 2007 at 06:12:08 PM EST
[ Parent ]

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