Heat Transfer
- Created by: mohap023
- Created on: 27-02-14 12:57
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- Heat Transfer
- Thermal Radiation
- Thermal radiation is the energy transfer by electromagnetic waves
- All objects emit thermal radiation
- The hotter an object is, the more thermal radiation it emits
- The sun emits radiation in all parts of the electromagnetic spectrum
- Thermal radiation is also called infra-red radiation
- Surfaces and Radiation
- Dark matt surfaces are better emitters of thermal radiation that light shiny surfaces
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- Dark matt surfaces are better absorbers of thermal radiation than light shiny surafecs
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- Dark matt surfaces are better emitters of thermal radiation that light shiny surfaces
- Conduction
- metals conduct heat better than non metals because non metals have no free electrons
- Wood condicts heat better han glass
- Copper is a better conductor of heat than steel
- Materials such as fibreglass are good insulators because they ccntain pockets of trapped air
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- Convection
- Convection occurs when the more energetic particles move from the hotte region to the cooler region and take heat with them
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- A radiator is an example of convection
- Convection currents are all about changes in density
- Convection occurs when the more energetic particles move from the hotte region to the cooler region and take heat with them
- Heat Transfer By Design
- Vacuum flask is designed to keep drinks at the temperature you want
- Cavity wall insulation in homes reduces heat loss through the walls
- Double glazed windows consists of a vaccum between 2 panes of glass which cuts out heat transfer
- Thermal Radiation
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