Transcript Sources of Thermal Energy

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, Geysers
How 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 passive
solar heating might have a wall of windows on the south side of the
house. The remaining exterior walls are well insulated and have few
windows. 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.
Check out this Solar System!
• Hot Water Tank
Wind Energy
• Energy of Moving Air
Wind energy is a result of solar energy. As the Sun
heats the air, the warmer air rises and cools
off. 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
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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, and
fairly cold climate mean that materials have to be transported over
large distances. Our energy use produces many economic benefits for
ourselves and other countries. It also contributes to global warming.
• Global Warming
One way to Try to Recycle Heat
Cogeneration
Engines 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 waste
heat to generate electricity or heat buildings, or do
other useful tasks.
New York City University