Transcription of Energy Transfer and Conversion Methods
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Energy Transfer and Conversion Methods
Energy Transfer and Conversion Methods MIT 9/16/2010. Sustainable Energy Fall 2010 Conversion 1. Mission of this Session Introduce the importance and challenges of Energy Conversion Diffuse Energy sources Thermodynamic limits Rate processes 2. Sustainable Energy Fall 2010 Conversion Energy Conversion Energy Conversion is the process of changing Energy from one form to another Energy Energy Useful Source Conversion Energy 3. Sustainable Energy Fall 2010 Conversion Historic Energy Conversion Sequences Biomass heat (esp. cooking). Solar heat , dry clothes, dry food Solar is still main light source, no need for Conversion Solar is source of biomass, wind, hydro, etc. Biomass farm animals horsepower, food Later, people also did these conversions: Coal heat Hydro milling flour, running machinery Wind pump water 4.
Chemical reactions either require or release heat. CH4 + 2 O2 → CO2 + 2 H2O Hrxn = -890 kJ/mol Exothermic reaction: one that gives off energy. Hrxn < 0. Endothermic reaction: one that requires energy. Hrxn > 0. Except in unusual situations (e.g. fuel cells, chemiluminescence) essentially all of the ΔHrxn is released or supplied as heat.
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