Alternative energy. Solar Heating and cooling Passive solar- 1. no outside energy is used to run fans or pumps. 2. the building itself along with.

Alternative energy

Solar Heating and cooling

Passive solar- 1. no outside energy is used to run fans or pumps. 2. the building itself along with landscaping help to

collect store and distribute the sun’s energy Active solar- 1. heating system that has flat plate collectors

installed on the sunny side that is covered in transparent glass or plastic

2. Water or air is circulated through collectors to absorb captured heat and carry it to storage tanks

Active solar

3. Heated air and water can be pumped through out the house.

4. Initial cost to install is still quite high. Storage must be added for sunless days. These can only store enough for one or two days. A back up heating system must be used and adds to the expense.

Solar electricity 1. concentrating solar power is a collection system

that concentrates enough sunlight to generate a large amount of steam

2. The steam is used to spin a turbine and rotates the coil of a generator to produce electricity.

Geothermal

Geothermal energy – uses the natural heat of the earth as an energy source

1. Geothermal reservoirs provide hot water or steam that can be used for heating and cooling buildings, processing foods and other goods, and generating electricity

2. Currently used in about 20 different countries. The Geysers geothermal instillation in San Francisco is the largest in the world

Geothermal

https://www.youtube.com/watch?v=sbiq_yd-znM&list=UU3LlvEUT4Bc9jKG8Xrmuf_g

Wind power

1. The winds energy originates from the uneven heating of the earth’s surface.

2. The sun’s rays heat the poles at an angle which creates large scale currents in the atmosphere.

3. Early wind mills were used to pump water for cattle.

Wind power

4. Inexpensive electricity put most windmills out of business.

5. Like solar wind as a resource is erratic. 6. Wind generated electricity can be stored in

batteries. 7. Most effective systems have interconnected

machines that averages power over a large area.

Water power

Water power- we are already using a large percent of our available hydropower.

1. Growing interest in using the energy available from small dams and from undammed flowing water.

2. Would use small turbo generators

Biofuels

1. The energy released by the direct combustion or the conversion of biofuels into solid, liquid, or gas fuels.

2. The by-products can be used for food, fertilizer, and chemicals.

3. Biofuels can be used to produce electricity, heat, steam, and transportation fuels.

4. Sources of biofuels include- forest products, agriculture and food processing wastes, municipal sewage and solid waste

Biofuels in our future

1. Most biofuels are made from sugar cane and corn. 2. The process is that sugar is converted by yeast to produce

ethanol and carbon dioxide 3. Corn is not a practical source since it competes with food

crops 4. cellulose is a good source and is found in biomass waste from

forests and fields, fast growing hays like switch grass, and woody crops like poplar.

These crops can grow in areas that don’t have to be plowed and help with soil erosion

5. Bio enzymes break these down and yield more energy then corn

Biofuels in our future

Biofuels in our future

https://www.youtube.com/watch?v=QegyXo5u9uI