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Heat Transfer

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nick di croce

on 8 April 2013

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Transcript of Heat Transfer

CONVECTION Convection involves the transfer of heat (energy) within liquids and gases.
Faster and slower moving particles move in a circular current.
For example, water particles near bottom move faster and further apart causing them to be lighter than those on top. The colder particles near the top sink to the bottom. The lighter particles move upwards replacing the colder particles. This movement creates a circular current. CONDUCTION Heat (energy) can be transferred through a material or from one material to another by direct contact.
It involves only the vibration of the particles of the material.
Conduction explains why objects feel hot or cold to the touch - metals like copper and aluminum transfer energy easily whereas plastic and wood do not.

For example, cooking an egg in a pan on a stove is a form of conduction. Energy from the burner travels through the pan and into the egg. The particles of the pan collide with the particles of the egg, causing the egg's particles to move faster. This faster motion causes the temperature of the egg to rise. RADIATION Radiation involves the transfer of heat (energy) by electromagnetic waves.
Particles are not involved in the transfer of radiant energy, so radiant energy may travel through empty space.
For example, it includes visible light, ultraviolet light and infrared rays How do we transfer heat (energy) in everyday life? HEAT TRANSFER PREVENTING ENERGY LOSS Insulation is put into the walls and roof of a house to prevent energy loss through conduction, convection or radiation.

Air currents in a house move by convection so weather stripping around doors and windows are used to reduce drafts and energy loss.

Modern windows use low-E glass that reduces the transfer of radiant energy by keeping energy inside during winter and outside during the summer.
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