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EmergyEmergy Simply, Emergy is 'Embodied energy' Macrakis 00:31, 1 Apr 2005 (UTC) An Example that chalenges the use and definition;- an aluminium engine block could well 'contain' more emergy than one made from cast iron. (aluminium being an energy intensive material to produce) but during the life of the engine block less eNergy is required to move it around on its many miles of many jouneys. Therefore the emergy 'within' each engine block will change during its life. Assuming the major energy source used to smelt the aluminium was electricity and the major fuel used to propel the engine is petrol, the following is a crude approximation of emergy analysis Aluminium Engine block t=(0) Emergy=0 t=(day after aluminium smelted) Emergy=electrical energy used t=(day after engine block manufactured) Emergy=electrical emergy + manufacturing energy used t=(a year after automobile manufactured and sold) Emergy=electrical emergy + manufacturing emergy + petrol energy used throughout the year t=(twenty years on) Emergy=electrical emergy + manufacturing emergy + petrol energy used throughout the automobile's life (the above is a crude analysis owing to many factors ommited) Cast Iron Engine block t=(0) Emergy=0 t=(day after iron smelted) Emergy=electrical energy used t=(day after engine block manufactured) Emergy=electrical emergy + manufacturing energy used t=(a year after automobile manufactured and sold) Emergy=electrical emergy + manufacturing emergy + petrol energy used throughout the year t=(twenty years on) Emergy=electrical emergy + manufacturing emergy + petrol energy used throughout the automobile's life (the above is a crude analysis owing to many factors ommited) Aluminium Engine block or Cast Iron Engine block Now a comparison can be made between a Cast Iron and Aluminium engine block discussing many factors such as energy used during manufacture and additional weight from using cast iron etc etc. SEE ALSO http://dieoff.org/page170.htm or http://www.mnforsustain.org/emergy_odum_howard_t_emergy_evaluation.htm
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