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lecture28 - Energy conservation is the reduction of energy...

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ENGRI 1290 1 Energy consumption and conservation I Human energy consumption Energy losses Energy conservation
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ENGRI 1290 2 USA energy consumption (2004) Industrial 33 %: 9.6 PWh Transportation 28 %: 8.1 PWh Residential 21 %: 6.1 PWh Commercial 17 %: 4.9 PWh
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ENGRI 1290 3 USA energy production (2004) Industrial 20 % Transportation 28 % Residential and Commercial 11 % Electric Power 40 %
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ENGRI 1290 4 Energy use in the USA in 2009 1 Quad= 10 18 J 58% of the energy produced is lost …
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ENGRI 1290 5 The energy challenge Increase production Reduce losses The energy challenges are Increasing production yields to increased pollution. Improving efficiency can reduce losses. However this is only possible with new plants, not old ones. Also efficiency increase tends to lower energy prices which increases the rate of consumption (Jevons paradox). While we work on finding solutions (renewable, fast breeders, fusion reactors), we need to reduce energy consumption .
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ENGRI 1290 6 This is not energy conservation
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ENGRI 1290 7 Energy conservation
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Unformatted text preview: Energy conservation is the reduction of energy consumption by reducing energy usage while making this usage more efficient. Reducing energy consumption also reduce losses due to energy production and transportation. In the history of mankind, energy consumption always increased. The challenge today is to reduce it. This can be only achieved by a common agreement between a government and its people to increase the cost of energy. Is there any other way ? To be effective energy conservation has to happen is all energy sectors: Industry Commercial Residential Transport The direct consequence of energy conservation is economic slow down. ENGRI 1290 8 Energy Prices and Consumption 2008 Higher prices drive consumption down 10 6 BTU=293 kWh ENGRI 1290 9 Energy consumption for different countries Energy usage per capita (kg of oil equivalent) ENGRI 1290 10 Electrical energy consumption for different countries Electrical energy usage per capita (kWh)...
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