sources of thermal energy where does it come from?
TRANSCRIPT
Sources of Thermal Energy
Where does it come from?
What is an energy source?
• An object or material that can transfer its energy to other objects.
Ex. Electricity and Natural Gas are energy sources for most of our heating and cooking.
Law of Conservation of Energy
• Energy can’t be created or destroyed….IT IS TRANSFERRED FROM ONE SOURCE TO ANOTHER.
• Therefore, what are some of the sources of our THERMAL ENERGY or HEAT?
• Ask 1 student around you
Chemical Energy
• Humans have used Chemical Energy for years, even better we knew anything about it.
• ie Cave dwellers collected wood and transferred stored CHEMICAL ENERGY into THERMAL ENERGY when they had fires to keep warm.
• Where do we use Chemical Energy now to release Thermal Energy?
Electrical Energy
• Electricity is produced in many ways….Can you think of some?
HYDROELECTRIC POWER
Mechanical Forces
Make a Fire using Mechanical Forces
• Bow Drill Fire Starter
Geothermal Energy
• Energy that we Harness from the Earth’s interior is called GEOTHERMAL ENERGY
• Volcanoes, Hot Springs, GeysersHow a Geyser works
How do we use it?
• GeoThermal Energy Plant
Solar Energy
• How do we use Solar Energy? • How do we use the ENERGY FROM THE SUN to
our advantage….Think of 5 Ways and Write them below.
• 1• 2• 3• 4• 5
Disadvantages?
• Sun not always shining ie cloudy days• Sun doesn’t shine at night• Sun doesn’t shine often in the winter…..with
shorter days.
Ways to Overcome it
Passive Solar Heating
Passive solar heating uses the materials in the structure to absorb,store, and release solar energy.
For example, a home that uses passivesolar heating might have a wall of windows on the south side of thehouse. The remaining exterior walls are well insulated and have fewwindows. Energy from the Sun is absorbed by materials such as concrete in the floor or water in a storage tank. During the night,this stored energy is released and warms the air in the house.
Passive Solar Heating
Active Solar Heating
• USING the Sun’s Energy with DEVICES ie Solar Cells and Panels
Active solar heating systems involve fairly complex mechanical systems and devices called solar collectors. These collectors, usually on the roof or the south side of a building, contain water or air. The Sun heats the water or air, which is then pumped through the building by the mechanical parts of the system.
Wind Energy
• Energy of Moving AirWind energy is a result of solar energy. As the Sun heats the air, the warmer air rises and coolsoff. Cooler air falls, creating a convection current. These currents, on a global basis, form our wind systems.
Wind Energy in Alberta
• Wind Energy in Alberta is increasing as a source of renewable energy for Albertans and Canadians.
• How do Turbines Work
Conservation of Energy
• Which of the ideas that we have discussed are positive/negative for the environment? List them below
• POSITIVE NEGATIVE
Canada’s Energy Production
Canada's Energy IQ
• Where do we get our energy from?• Alberta• Ontario • British Columbia• PEI
Fossil Fuels
What are they?How do they form?
p. 246 Textbook
Problems
Canadians are among the highest producers of greenhouse gases (per person) in the world. Canada’s physical size, small population, andfairly cold climate mean that materials have to be transported overlarge distances. Our energy use produces many economic benefits forourselves and other countries. It also contributes to global warming.
• Global Warming
One way to Try to Recycle Heat
CogenerationEngines in cars, trucks, trains, and aircraft, and furnaces in buildings, generating stations, and large industries, get hot. They release a lot of thermal energy into the environment. This accidental warming of the environment is called thermal pollution. Cogeneration uses this wasteheat to generate electricity or heat buildings, or do other useful tasks.
New York City University