What can solar energy be used for?
- for heating water and air in homes and large buildings.
Name the 2 basic ways for using solar energy to provide heat?
- Passive Solar Heating
- Active Solar Heating
Which is more cheaper to set up the Active way or the Passive way of Solar Heating?
- Passive way (Passive Solar Heating)
Passive Solar Heating
Define Passive Solar Heating?
-Passive Solar Heating - is a system in a home that lets solar energy in, through the windows, and prevents heat from getting out.
The Greenhouse Effect
Define the Greenhouse effect?
-Greenhouse Effect is the process of trapping radiant heat inside a structure.
Describe the Greenhouse Effect?
-Radiant energy made up of waves from the sun travels through glass
-Plants and objects absorb the radiant energy-
-Plants and objects emit their own radiant energy that can not go through the glass. This trapped radiant energy keeps the greenhouse warm.
What is radiant energy composed of?
Active Solar Heating
Explain Active Solar Heating?
- Active Solar Heating - the system absorbes as much solar energy as possible and distributes it throughout the building. It requires another source of energy besides the sun as a backup.
Give an example?
In a house radiant energy is passed through glass and absorbed by a dark coloured collector plate. The absorbed energy is used to heat up water from pipes. Heat from the water is used to heat the air.
Define Heat Pollution?
- Heat Pollution is waste heat -heat that is not used
ex- an electric light bulb uses 5% of electrical energy the rest becomes waste heat.
Heat Pollution in and near Cities
In an electric generating station what is burned to produce electricity?
-Fossil Fuel is burned
Name some fossil fuel that's burned?
- natural gas
How much of the chemical energy in fossil fuel burned in a generating station becomes waste heat ?