Date post: | 14-Jan-2015 |
Category: |
Engineering |
Upload: | idc-technologies |
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Standby Power and Energy Efficiency
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Energy forms and conversions
• Energy : Capacity to do work
• Potential energy :
Stored type of energy
Gravitational
Mechanical Energy
Chemical Energy
Nuclear Energy
• Kinetic energy:
Form of movement
Motion
Thermal Energy
Radiant Energy
Sound
Electricity
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Energy conversion
Energy Conversion in stages
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• Conventional energy sources– Involves a combustion process– Depletion of natural resources like coal, oil, etc.– Major Air Pollution contributors
• Non conventional/Renewable energy sources– Combustion process not a must– Use Sun, wind, etc directly to produce power– Bio degradable wastes also can be used– Air pollution is avoided
Energy Sources
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• Calorific value decides the efficiency of an energy source per unit weight
• Typical calorific values in kilo calories per kg
Energy Sources - Calorific Values
Fuel Calorific Value (kCal/kg)
Paraffin 10,400 Diesel Petroleum 9,800
Charcoal 7,100 Dried Wood 4,700
Lignite 4,000 Wood (25-30% Moisture) 3,500
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Global Energy scenario
• Modern society today critically dependent on energy for its development
• Overrate of production and consumption of energy causing permanent damage to our natural habitat
• Measures are to be adopted by all sections of society: the government, utility companies, industries and individuals
How to contain waste, preserve the environment and stretch the inventory of current energy resources, until alternative renewable and more sustainable sources of energy are developed
• Energy efficiency :
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Global Energy Scenario
• Energy classification:
Primary or Secondary
Commercial or Non-commercial
Renewable or non- renewable
• Global Primary Energy Reserves :
Coal
Oil
Gas
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Climate change and environmental concerns
• Major environmental issues of global concern : Ozone Layer Depletion
Global Warming
Loss of Biodiversity
• Global Warming : • Present average global temperatures : 0.3–0.6°C warmer than a century ago
Industrial revolution
Human activities
Fossil fuel burning
Deforestation
Altered agricultural practices
• Causes:
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Global warming potential (GWP)
• HFCs and PFCs Most heat absorbent
• Methane traps over 21 times more heat per molecule than carbon dioxide
• Nitrous oxide absorbs 270 times more heat per molecule than carbon dioxide
•Effects of Global warming :
Rise in global temperature
Rise in sea level
Food shortages
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Loss of bio-diversity• Number of species of plant, animals, micro-organisms• Diversity of genes• Different eco-systems e.g. deserts, rain forests and coral reefs • Bio diversity boosts ecosystem productivity • Enables ecosystem to sustain itself against natural disasters• Strong link between bio-diversity and climate change• Global warming• Deforestation
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