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So, throwing in a factor of 1/2 for latitude and a factor of 1/2 for weather you get 250 Kcal per year per square metre, or 2.5e6 Kcal per year per hectare. At 8% efficiency, that is 2e5 Kcal per year per hectare. That's about 8.4e5 KJ per year per hectare. For comparison, the energy density of diesel fuel is 11 KWh per litre, or approximately 4e4 KJ/l. So, a hectare of chlorella can at most produce the equivalent of 21 litres of diesel fuel per year.

I could easily be off by a factor of 1000 because of sloppy use of units, but otherwise this is a no-go.

We have met the enemy, and it is us — Pogo

by Migeru (migeru at eurotrib dot com) on Thu Oct 25th, 2007 at 05:31:37 AM EST
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