Presentation is loading. Please wait.

Presentation is loading. Please wait.

Chapter 13 Renewable Energy and Conservation

Similar presentations

Presentation on theme: "Chapter 13 Renewable Energy and Conservation"— Presentation transcript:

1 Chapter 13 Renewable Energy and Conservation

2 Overview of Chapter 13 Direct Solar Energy Indirect Solar Energy
Heating Buildings and Water Solar Thermal Electric Generation Photovoltaic Solar Cells Indirect Solar Energy Biomass Energy Wind Energy Hydropower Other Renewable Energy Sources Geothermal Energy Tidal Energy High and Low Technology Energy Solution Hydrogen and Fuel Cells Energy Efficiency

3 Direct Solar Energy Varies with latitude, season, time of day, and cloud cover

4 Heating Buildings and Water
Passive solar energy system of putting the sun’s energy to use without requiring mechanical devices to distribute the collected heat Certain design features can enhance passive solar energy’s heating potential South facing windows (in N. hemisphere) Well insulated buildings Attic vents Overhangs and solar sunspaces


6 Solar sunspace Utilizes passive solar energy to heat and cool homes
Can be added to existing homes

7 Heating Buildings and Water
Active Solar Energy System of collecting and absorbing the sun’s energy, and using pumps or fans distribute the collected heat Most common Series of collection devices on roofs or in fields Typically a black panel or plate Used to heat water

8 Heating Buildings and Water
Solar Thermal Electric Generation Means of producing electricity in which the sun’s energy is concentrated by mirrors or lenses to either heat a fluid filled pipe or drive a Stirling engine More efficient than other solar technologies Benefits No air pollution No contribution to global warming or acid precipitation

9 Solar Thermal Electric Generation

10 Photovoltaic Solar Cells
Thin cells are treated with certain metals so that they generate electricity when they absorb solar energy Convert sunlight directly into energy No pollution and minimal maintenance Used on any scale Lighted road signs Entire buildings

11 Photovoltaic Solar Cells
Can be incorporated into building materials Roofing shingles Tile Window glass

12 Cost of Electrical Power Plants

13 Indirect Solar Energy Biomass Can convert to biogas or liquids
Plant materials used as fuel Ex: wood, crop wastes, sawdust, and animal wastes Contains energy from sun via photosynthesizing plants Renewable when used no faster than it can be produced Can convert to biogas or liquids Ethanol and methanol

14 Advantages and Disadvantages of Biomass
Reduces dependence on fossil fuels Often uses waste materials If trees are planted at same rate biomass is combusted, no net increase in atmospheric CO2 Disadvantages Requires land, water and energy Can lead to Deforestation Desertification Soil erosion

15 Indirect Solar Energy Wind Energy
Electric or mechanical energy obtained from surface air currents caused by solar warming of air World’s fastest growing source of energy Wind results from sun warming the atmosphere Varies in direction and magnitude New wind turbines harness wind efficiently

16 Wind Energy Most profitable in rural areas with constant wind
Few environmental problems Kills birds and bats No waste- clean source of energy Biggest constraints Cost Public resistance

17 Indirect Solar Energy Hydropower Sun’s energy drive hydrologic cycle
Form of renewable energy reliant on flowing or falling water to generate mechanical energy or electricity Sun’s energy drive hydrologic cycle Most efficient energy source (90%)

18 Hydropower Generates 19% of world’s energy Traditional hydropower
Only suited for large dams New technology May be able to utilize low flow waterways Problems with Dams Changes natural flow of rivers Disrupts migratory fish patterns Potential dam breaks

19 Other Indirect Solar Energy
Ocean waves Produced by winds Has potential to turn a turbine- and create electricity Ocean Temperature Gradients Use difference in temperature of surface and deep water to create electricity

20 Other Renewable Energy Sources
Geothermal Energy Energy from the Earth’s interior for either space heating or generation of electricity From Hydrothermal Reservoirs (left) Created by volcanoes Reservoirs used directly for heat or to generate electricity

21 Geothermal Energy From hot, dry rock Geothermal heat pumps
Use difference in temperature between surface and subsurface Great for heating buildings Expensive installation

22 Other Renewable Energy Sources
Tidal Energy Form of renewable energy that relies of the ebb and flow of the tides to generate electricity Typical difference between high and low tide is 1-2 ft Narrow bays may have greater variation Energy can be captured with A dam across the bay A turbine similar to a wind turbine

23 Hydrogen as a Fuel Source
Advantages to Hydrogen as a fuel source Very high energy density Can be produced from any electrical source Electrolysis (see illustration on next slide) No greenhouse gases and few other pollutants Can be used in vehicles Disadvantages to Hydrogen as a fuel source Highly volatile (requires special storage) Relatively inefficient

24 Hydrogen as a Fuel Source- Electrolysis

25 Hydrogen Fuel Cell Fuel cell
Device that directly converts chemical energy into electricity Requires hydrogen from a tank and oxygen from the air Similar to a battery, only the reactants are supplied from outside source

26 Future Applications of Fuel Cells
Vehicles Not yet commonly available Hydrogen is not yet readily available as a fuel source Batteries in cell phones or laptops

27 Energy Consumption Trends and Economics

28 Energy Efficient Technologies
Compact Fluorescent light bulbs Condensing furnaces Super-insulated buildings (right) Energy efficient appliances Automobiles Aircraft technology

29 Cogeneration Production of two useful forms of energy from the same fuel

30 Energy Savings in Commercial Buildings

31 Saving Energy at Home


Download ppt "Chapter 13 Renewable Energy and Conservation"

Similar presentations

Ads by Google