期刊
INTERNATIONAL JOURNAL OF EXERGY
卷 7, 期 3, 页码 333-351出版社
INDERSCIENCE ENTERPRISES LTD
DOI: 10.1504/IJEX.2010.031988
关键词
exergy; thermodynamic; second-law; efficiency; biochemical; living cell; photosynthesis; solar; photon; Calvin cycle; chloroplast; glucose
This paper gives the exergy analyses of the main biochemical processes of photosynthesis in green plants. In the light reactions, photosystem I, photosystem II, and ATP-synthesis are found to operate at exergy efficiencies of 50%, 68% and 81%, respectively, so that 48% of the exergy of directly utilised solar photons is converted to biochemical energy carriers. Subsequently, in the dark reactions, glucose is synthesised from CO(2) at an exergy efficiency of 85%. When including the wasteful effect of photorespiration, the overall exergy efficiency of the photosynthesis of glucose is determined at 31-34%, with most of the exergy losses occurring during the initial conversion of the photon energy.
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