Sustainable Energy

Publish in



Please download to get full document.

View again

of 29
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Sustainable Energy. How to wean ourselves off fossil fuels and maintain quality of life. Reading: Ch. 1, 2 in Sustainable Energy – Without the H ot Air , by David MacKay Fossil fuel CO 2 emissions: Burning buried sunshine.
Sustainable EnergyHow to wean ourselves off fossil fuels and maintain quality of lifeReading: Ch. 1, 2 in Sustainable Energy – Without the Hot Air, by David MacKay fuel CO2 emissions: Burning buried sunshineCarbon emissions rising faster than estimatesGlobal C emissions mapWhere emissions come fromAtmospheric CO2:Last 50 years (2.0 ppm/year increase, or 0.5%)391 ppm1769: James Watt patents the steam engineSustainable Energy – Without the Hot Air, by David MacKayHow much is a gigaton (Gt)?
  • One billion metric tons (1012 kg)
  • It is about 2750 Empire State Buildings.
  • Global C02emissions are about 32Gt as of 2012.
  • Carbon Emissions (year 2000)Global emissions are 32 Gt CO2 per yearPer capita emissions: ~5.5 tons CO2 per year Sustainable Energy – Without the Hot Air, by David MacKay74% emissions from “energy”rest is from agriculture, deforestationSustainable Energy – Without the Hot Air, by David MacKayEnergy and Power
  • Energy is measured in kilowatt-hours (kWh)
  • Example, a 40 Watt bulb left on all day (24 hours) is about 1000 Wh or 1 kWh
  • Power is the rate of energy use, measured in kWh per day
  • Average European uses 125 kWh per day per person (total energy)
  • Average American uses 250 kWh per day per person.
  • Energy sourcesEnergy usesUS average = 250 kWh per day per personSome Observations on US energy use
  • We waste a lot of energy
  • We use a lot of oil for getting around
  • Natural gas is increasing
  • Renewables are nowhere (for now)
  • energy use is diverseCan we live without fossil fuels?Wind • solar • hydro • wave • tidal • geothermal • nuclearSustainableEnergy use < renewable sourcesUnsustainableEnergy use > renewable sourcesSustainable energy components
  • Land wind turbines
  • Offshore wind turbines
  • Solar: Thermal and PV
  • Biomass
  • Hydroelectricity
  • Wave energy
  • Tidal energy
  • Geothermal
  • Nuclear
  • Assumptions
  • This is only an exercise to see IF renewables can meet current total energy demand (not just electricity).
  • Book focuses on United Kingdom.
  • US per capita consumption is twice that of UK!
  • No attempt to HOW this can be done. MacKay did not address cost, social impact, community values, priorities
  • WINDSolarHydroelectricityTidal and WaveGeothermalTheoretical vs. Practical renewable resource plans for UKActual “plans”are quite modest and don’t meet demandSustainable Energy – Without the Hot Air, by David MacKay…then there is social realityThe NIMBY effectHard choices to makeOther people’s renewables…Desertec – ambitious plan to power EuropeAny renewable energy plan must provide the energy you need
  • For the UK, the per capita energy draw is 125 kWh per day.
  • USA is DOUBLE this!
  • MacKay outlines 5 plans for 5 constituencies (Diversity, NIMBYs, Greens, Economically viable)
  • Sustainable Energy – Without the Hot Air, by David MacKaySustainable Energy – Without the Hot Air, by David MacKayA renewables plan that meets ALL of current UK energy needsBallpark cost: $1.4 trillionPer capita cost: $22,000Plan MSustainable Energy – Without the Hot Air, by David MacKayEfficiency gains – the simplest, cheapest (partial) solution
  • Infrastructure ideas:
  • Electrify Transport
  • Solar and heat pumps for hot water
  • MacKay’s home efficiency gainsSustainable energy lessons
  • It’s hard to meet UK energy needs with renewables only, It’s doubly hard for US.
  • Any viable sustainable energy plan involves hard choices.
  • It’s expensive, but within the range of other major initiatives (wars, space program).
  • It quickly exposes waste and inefficiencies.
  • What’s lacking is not technology, but social and political will.
  • Related Search

    Previous Document

    Solar water heaters

    Next Document

    New World

    We Need Your Support
    Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

    Thanks to everyone for your continued support.

    No, Thanks