Heat Essay

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Solar Heating

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?
- waves

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.

Heat Pollution

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?
- coal
- oil
- natural gas

How much of the chemical energy in fossil fuel burned in a generating station becomes waste heat ?
- 60%...

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