HEAT TRANSFER By Shahzaib. Please Don’t Edit. Education Puposes Only.

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Presentation transcript:

HEAT TRANSFER By Shahzaib. Please Don’t Edit. Education Puposes Only.

Heat Transfer  Heat transfer is the exchange of thermal energy between physical systems.  The rate of heat transfer is dependent on the temperatures of the systems and the properties of the intervening medium through which the heat is transferred.  The three fundamental modes of heat transfer are conduction, convection and radiation.

Conduction  Heat is thermal energy. It can be transferred from one place to another by conduction.  The ions are packed closely together and they vibrate continually. The hotter the metal, the more kinetic energy these vibrations have. This kinetic energy is transferred from hot parts of the metal to cooler parts by the free electrons.

Convection  Heat energy is transferred from hot places to cooler places by convection.  This is because the particles in liquids and gases move faster when they are heated than they do when they are cold.  The liquid or gas in hot areas is lessdense than the liquid or gas in cold areas, so it rises into the cold areas.dense

Convection

Radiation  Heat can be transferred by infrared radiation. Unlike conduction and convection - which need particles - infrared radiation is a type ofelectromagnetic radiation that involves waves.  Radiators are often painted with gloss paint, but they would be better at radiating heat if they were painted with matt paint instead. Also, despite their name, radiators actually transfer most of their heat to a room by convection, not radiation.

Radiation

Heat Transfer It’s Video Time!

Thank You!