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project report helper
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Joined: Sep 2010
02-11-2010, 01:43 PM

.ppt   air_conditioners.ppt (Size: 100.5 KB / Downloads: 162)
Air Conditioners

Observations About Air Conditioners

They cool room air on hot days
They emit hot air from their outside vents
They consume lots of electric power
They are less efficient on hotter days
They can sometimes heat houses, too

Heat Machines

Air conditioners
use work to transfer heat from cold to hot
are a type of heat pump
use flow of heat from hot to cold to do work
are a type of heat engine


Rules governing thermal energy flow
Relationships between
thermal energy and mechanical work
disordered energy and ordered energy
Codified in four laws of thermodynamics

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