First Principle Land Requirements to Feed a Person: Difference between revisions
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A person uses 100w of energy. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates. | A person uses 100w of energy from food. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates. | ||
Revision as of 10:29, 30 June 2016
A person uses 100w of energy from food. [1]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates.