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Contents
Types of Heat Transfer
Condensation and Evaporation
Rate of Heat Transfer
Energy Efficiency in the Home
Specific Heat Capacity
Energy Transfer
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Slide 3

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Contents
Efficiency of Machines
Sankey Diagrams
Cost of Electricity
Choosing Electrical Appliances
Learn Some More
Finish
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Types of Heat Transfer
There are three types of heat transfer:
Radiation
Conduction
Convection
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Types of Heat Transfer
All objects are continually emitting and
absorbing infra red radiation
An object hotter than its surroundings emits
more energy than it absorbs and vice versa
You can feel infra red radiation (e.g. from a
fire)
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Types of Heat Transfer
The amount of infra red radiation that is
absorbed and emitted by an object depends on
its surface colour and texture
Dark, matt surfaces absorb and emit radiation
much better than smooth, shiny surfaces.
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