warm up how do you think renewable energy is different than nonrenewable energy?

Warm up

How do you think renewable

energy is different than

nonrenewable energy?

Renewable Energy

SEV4 Resource allocation and

use

Renewable Energy

●Sources that are constantly being formedoSolar

oWind

oMoving water

oEarth’s heat

Solar Energy

●Already used oWater cycle

oPhotosynthesis

oWind

oSunshine warming a room

oSolar cells

Passive Solar Heating(no moving parts)

●Use sun to heat something directly

●Northern hemisphere homesoLarge, south facing windows absorb heat in

winter

oOverhangs block sunlight in the summer

oInsulation and air flow are important

Active Solar Heating(moving parts)

●Sun’s energy is gathered to heat a building or

water

oSolar water heaters

Water heated on roof

Hot water used to heat water supply

Solar Panels

●Photovoltaic cells

oNo moving parts, no pollution (PRO)

oNeed many cells to produce decent

yields (CON)

Wind Power

●Air is heated unevenly --> wind

●Wind power --> Electrical energy

●Fast growing resource

●3 months to build a windmill

Wind Farms

●280,000 homes in CA powered by wind

●Take up little spaceoFarmers add windmills to farm

oSell power to cities

Currently Underused

●Windiest areas on earth could generate

10x energy used worldwide.

●Transportation of energy is challenging

●Wind farms may make hydrogen from

water in the future. Hydrogen used as fuel.

Biomass

●Plant material, manure, other organic

matter used as fuel

●ChallengesoTrees – renewable, but must be managed

oBurning wood or manure – air pollution

Methane

●Decomposition --> methane (CH4)

●Can be burned for heat or electricityoChina – 6 million homes use methane for

heating/cooking

oEngland – Methane from cow manure as fuel

for electricity

oUSA – electricity from methane generated by

landfills

Alcohol

●Ethanol – fermenting fruit or agricultural

waste

●Gasoholomix of gasoline and ethanol

oProduces less pollution when burned

●Requires more fossil fuel input than it yields

Hydroelectricity

●Produced from moving water

●20% of world’s electricity

●How it worksoReservoir holds water

oWater turns turbines/generator

oGenerator turns movement into electricity

Benefits of Hydroelectricity

●Expensive to build but cheap to operate

●No air pollution

●Last longer

●Flood control

●Water for drinking, agriculture, industry,

and recreation

Disadvantages of Hydroelectricity

●Disrupts river flowoEcosystems flooded behind dam

oRiver flow diminished below dam

●Displaces people

●Farmland downstream less productive

●Decay in reservoir --> greenhouse gases

Modern Hydroelectricity

●No new dams in the USA

●Brazil, India, and China still building large

dams

●Micro-hydropower

Geothermal Energy

●From the heat in earth’s crust

●Use water or steam to turn turbines

●The Geysers in CA powers 1.7 million

homes

●Philippines, Iceland, New Zealand, Japan,

Mexico, and Italy

●Renewable, but must be managed

Geothermal Heat Pumps

●Heat and cool homes

●Temp underground is constant

●Loop of fluid in a pipe underground and

into house

Warm up

●What is the difference between

renewable energy and

alternative energy?

Alternative energy

●Still in development

●Some renewable energy was once

alternative energy.

●Gov’t investments are vital to

development.

Tidal power

●BenefitsoTides happen 2x a day

oGenerates electricity

like hydroelectric dams

●DrawbacksoExpensive

oFew suitable locations

Ocean Thermal Energy Conversion

(OTEC)●Benefits

oCold and warm ocean

water are available at

different depths

oCold water boils at low

temp in vacuum

chamber

oSteam can turn a

turbine

●DrawbacksoNot cost effective

oUses 1/3 of the energy

it produces

oEnvironmental effects

unknown

Hydrogen

●BenefitsoAbundant

oNo air pollutants when

burned

o(plants may produce it)

●DrawbacksoGenerating it uses

energy, money, and

makes pollution

oExplosive and

dangerous

Fuel Cells

●Produce electricity chemically

●Combine H2 and O2 and electricity is

produced.

●Water is only byproduct

Energy Efficiency

●What you get out vs. what you put in

●%Energy efficiency =

●Much energy is wasted

Useful energy out

Energy

in

x 100

Efficient Transportation

●Public transportation

●Hybrid carsoEfficient gasoline engine

oElectric engine

oAerodynamic

Cogeneration

●Production of 2 useful forms of energy

from 1 fuel source

●Use waste heat from a furnace to turn a

turbine

Energy Conservation

●Saving energyoUse energy efficient devices

oWasting less energy

Energy Conservation Poster

Create a poster that includes…an energy conservation method around the homea slogan to convey that messagea picture that supports your messagean explanation of why this method saves energy

This will count as a formative grade

Cities and Towns

●Osage, IAo3,600 people saved $1 million/year

Sealed doors and windows

New efficient furnaces

Insulated water heaters

oBusinesses moved to the area

oUnemployment is down

Around the Home

●Spend $1,500/year on energy costs

●Much is wastedoInsulation

oEfficient windows

oWeather stripping

oWash clothes in cold water