Associated Slides - Redcliffe College
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Associated Slides - Redcliffe College

PRACTICAL AND MORAL OUTCOMESwith Renewable EnergyEnergising the future:Redcliffe College and JRI12 February 2011John TwidellAMSET

Why practical?Because…nothing…energylivesmovescommunicatesis heatedor is made...…without a supply of

Without supplies of energy,there is……..economic...commercial...domestic...biological...….death

Why moral?Because……. the context is sustainability…. the enrichment of global society…. safeguarding future generations…. ecological integration…. minimum pollution…. energy security…. i.e. stewardship

So………….… choice of energy supply is bothpractical and moral…. for governments, institutions, commerce,schools, churches…. for your home and mine

Definition• Renewable Energy is energy from……the natural and persistent currents ofenergy in the environment…..e.g. sunshine, wind, rainfall• “Green Energy”• intrinsically non-polluting

Just think about it…Using renewable energy makes us part ofnatural ecology; we divert energy alreadypassing by and return it to the environment.We are not using mined materials that areintrinsically antagonistic to ecology andleave a legacy of pollution and harm.

Per capita renewable energy: kilowatt continuous/person on Earthsolar equivalent of 20,000 one-bar heaters for each man, woman and childReflected 8,000 kWSolar worldwideradiation per personAbsorbed 20,000 kWGeothermalheatGravitationalpotential13,000 kW50 kWabsorbedas heat7,000 kWwind,waves5 kWheat500 kWtides0.2 kWwater evaporation,rain & hydro flowphotosynthesis(plants, crops)The Sun provides more energy to the Earth in one hour than theworld population uses in one year. Efficient UK needs

So there is no shortage ofrenewable energy…….if we have availabletechnologies to harness it……. for heat, fuels and electricity

Renewable energy technologiesSolarradiationGeothermalheatGravitationalpotentialSolar water heaters,Solar buildingsConcentrator powerHydro-electricity;very large (GW) tovery small (100 W)Wind turbines,Wave powerFuel wood, biomassbiodiesel, bioethanol,wastesHeat pumpsTidal range power;e.g. Severn estuary& Tidal stream powerPhotovoltaicsolar cells

Of which the BIG THREE are:solarbiomasswindThere is no habited place withoutat least 2 of these 3as significantresources

Renewable energy technologies forheat, electricity and transport fuels• solar buildings• solar water heating• solar thermal electricity• solar cell photovoltaicelectricity• concentrator solarthermal power• solar driers• solar refrigeration• hydroelectricity• micro-hydro• wind turbines• wave power• biomass crops• pyrolysis• biofuel oils• biogas• sewage gas• urban waste• geothermal heat• ground-source heatpumps• tidal range power• tidal stream power• fuel cells

each of these technologies isbeing improved by modernscience….• Photovoltaics by solid-state physics, nanotechnology,mechanisms of photosynthesis…..• Wind turbines by composite materials, multi-polegenerators, power electronics, frequency domaincontrol, micrositing….• Solar buildings by thermal modeling, advancedglazing, heat recovery, insulating aerosols….• Solar water heating by selective surfaces, stratifiedtanks….• Biofuels by biochemical lignin and waste processing• Etc….

Quote: Thisis “a scenariothat it istechnicallypossible toachievealmost 100%renewableenergysourceswithin fourdecades”WWF Worldwide Report Feb 2011“100% Renewable Energy by 2050”

WWF reasons for „100% renewables‟• 1.4 billion have no electricity now• Oil and gas running out• Climate chance already a reality (e.g. 37% species „committed toextinction‟) so rapidly reduce fossil CO 2• Hence dramatically reduce coal• Nuclear is unethical and expensive• More efficient use of energy easily possible• Already in 2009: > 50% European & US new power capacity fromrenewables• Encouraging growth in all renewables• Reducing meat consumption increases crop-land• Biofuel from wastes and „constrained‟ biomass crops, henceallowing adequate food production


Renewables now…….significant growth worldwideTop down• EU 20% all energy,renewables by 2020• UK legal commitmentfor 90% reduction infossil-carbon by 2050• Global carbon tradingslowly happening• China committed torenewables and energyefficiency, muchmanufacture• Economies adaptingBottom up• Feed-in tariffs formicrogeneration inmajority ofindustrialised countries;growth follows• Trade skills training• Lifestyles adapting

REN21 : World Status Report Total global energy use little changed 2008/20010;nuclear decreasing, fossil-fuels static, renewables increasingBP Statistical Review of World Energy 2010

Global electricity

Wind power

Solar photovoltaic electricity

Solar water heating

Vehicle biofuels

Business investment is vitalGlobalinvestmentPEW Bloomberg2009 report

Growth rate and total of operatingrenewables in year 2009:REN21 Global Status Report• grid solar PV .......53 %/y• wind power …………32 %/y• solar hot water … 21 %/y• geothermal power ..4 %/y• hydropower ……………3 %/y• ethanol fuel …………10 %/y• biodiesel ………………9 %/ytotal 22GWtotal 159GWtotal 180GW thtotal 11GWtotal 980GW

World employment

photovoltaicsolar cellelectricity.3 kW maxsolarwaterheaterSolar energy chez John and Mary Twidell, midland UK.Annual production ~ 50% electricity and ~ 50% hot waterSolar water heater installed 1997, payback by 2005. PV installed 2003, payback ~2030

local wood fuel;domestic heatingcookingdry wood storepellet stoveenclosed wood-stovehouse boilerfor radiators,heating & hotwateryou are all invited

Conclusions: renewables …• proven technologies• most are in the market place• credit for environmental and sustainablebenefits• favoured by world, European, national &local policies• but still much to do

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