EES 0836 Lecture Notes - Lecture 1: Photon, Photosynthetic Efficiency, Joule
3 Apr 2016
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Lecture - 1: renewable energy ii, biomass, other renewables, biomass, biomass is any living organism, plant, animal, etc, 401012 w out of the 174,0001012 w incident on the earth from the sun goes into photosynthesis. This is the fuel for virtually all biological activity. Refer to this as unit block : c6h12o6 (glucose) has x=6: photosynthetic net reaction: xco2 + xh2o + light [ch2o]x + xo2. 1 g 1. 07 g: carbohydrate reaction (food consumption) is essentially photosynthesis run backwards. 16 kj per gram is about 4 kilocalories per gram: basically a battery for storing solar energy. Usage just runs reaction backward (but energy instead of light: photosynthetic efficiency, only 25% of the solar spectrum is useful to the photosynthetic process. Incomplete usage of photon energy just like in solar pv: net result is about 6, realistic photosynthetic efficiency, how much biomass is available, two estimates of plant production in book come up with comparable answers:
