Renewable Energy Resources. Energy: Conservation and Transfer

Transcription

1 Renewable Energy Resources Energy: Conservation and Transfer

2 Warm up: Renewable Energy Resources

3 Introduction - Humans have used energy from wind and moving water for thousands of years. Today, these resources are used to produce electricity. - Other renewable resources are also used as sources of energy.

4 Renewable Energy Resources - Renewable energy resources - can be reused or reformed after a brief period of time - are replaced through natural processes at a rate that is equal to or greater than the rate at which they are being used

5 Types of Renewable Energy Resources - Biomass - Geothermal power - Hydroelectric power - Solar power - Wind power

6 Biomass - Biomass is any material from living living that can be used as an energy source. - Examples: burning wood, burning discarded plant material - A biomass fuel called ethanol can be made by fermenting crops such as corn.

7 Types of Biomass

8 Biomass Advantages Disadvantages - If developed properly, biomass can and should supply increasing amounts of biopower. - Sustainable - Reduce emissions of heat-trapping gases to avoid the worst impacts of global warming. - Burning biomass releases carbon dioxide cause harmful air pollution. - Ethanol as a fuel it is made from crops that are also food sources for people and farm animals. - Damage ecosystems - Consume large amounts of water - Produce net greenhouse

9 Geothermal Power - Geothermal power is heat energy from inside Earth. - Using geothermal energy requires a location that is over volcanically active ground (like Iceland) - Resources of geothermal energy range from the shallow ground to hot water and hot rock found a few miles beneath the Earth s surface.

10 Geothermal Power Advantages Disadvantages - Sustainable - Clean - Efficient - Very expensive - Need a place over volcanically active ground

11 Hydroelectric power - Hydroelectric power (hydropower) refers to using water to generate electricity. - Water is the most common renewable source of energy in the US, about 7%. - Many hydroelectricity power plant use a dam or river to store water. Water released from behind the dam flows through a turbine, spinning it, which then turns a generator to produce electricity.

12 Hydroelectric energy

13 Hydroelectric Power Advantages Disadvantages - Very clean - Efficient - Is one of the least expensive sources - Provide benefits: - Recreations - Habitat for a wide variety of aquatic and terrestrial species - Irrigation - In times of drought, the hydroplant may not function properly or produce enough energy to meet demands. - Very expensive to build a dam - Dam can cause flooding of land

14 Solar energy - Solar energy is energy from the sun. - Solar power is the conversion of sunlight into electricity, either directly using photovoltaics (PV), or indirectly using concentrated solar power (CSP). - Solar panel uses solar energy to heat water or to produce electricity.

15

16 Solar Energy Advantages Disadvantages - Gives off huge amounts of energy. Provides much more energy than people need, so solar energy will not run out. - Doesn t cause pollution - Very clean - Solar panels are expensive. - There are environmental concerns associated with the production of collectors and storage devices. - Provide less than 1% of US energy needs. - Doesn t work at night or during cloudy sky.

17 Wind Energy - Wind energy is the energy of moving air. - It can be used to turn the blades of windmill or wind turbines. - In a wind turbine, the blades are attached to a shaft that turns an electric generator, which produces electricity. - Wind farms are areas that uses a large number of wind turbines to produce electrical energy.

18

19 Wind Energy Advantages Disadvantages - Is the world s fastest-growing energy technology. - Doesn t cause pollution - Clean fuel sources - Sustainable - Cost-effective - Must be constructed where winds blow rather steadily most of the year. - People who live near wind farms say that the turbines are noisy. - Birds and bats have been struck and killed by the turning blades.

20 Activity: In your notebook answer the following questions. Teacher will check it at the end of the class 1. Why has wind become an attractive source of energy? 2. What are some of the negative impacts of wind energy? 3. Does hydroelectric power need a large dam? Explain. 4. Describe at least 2 of the pros and cons related to hydroelectric power. 5. What are some uses of the solar technology? 6. Describe where you would put geothermal power plant. For today NOW!!!!