Quote from the book
" Understanding heat
What is heat?
To understand just how an air conditioning system works, we must first understand the
nature of heat.
For a simple definition we may say that heat is energy. The meshing of gears, the turning of
wheels cause friction which results in heat. Combustion (fire) gives off heat. The burning of
sun radiates heat to the earth's surface.
Heat in the correct amount will provide life and comfort. Heat in either extreme - extreme to
much or to little - will be uncomfortable.
The control of temperature means the control of comfort.
Air conditioning is a method of controlling heat.
When is heat hot?
When is heat cold?
All substances contain heat. Something "feels" hot when it is warmer than our body
temperature. When something contains less heat than our bodies, we say it feels cold!
Cold is merely the removal of some heat.
Science tells us that a measurement called "Absolute Zero" is the point at which all heat is
removed from an object (approximately -273 C). Any substance above this absolute zero
temperature retains some heat.
The burning of the sun radiates heat to the earth. "
download Automotive Air Conditioning Training Manual
" Understanding heat
What is heat?
To understand just how an air conditioning system works, we must first understand the
nature of heat.
For a simple definition we may say that heat is energy. The meshing of gears, the turning of
wheels cause friction which results in heat. Combustion (fire) gives off heat. The burning of
sun radiates heat to the earth's surface.
Heat in the correct amount will provide life and comfort. Heat in either extreme - extreme to
much or to little - will be uncomfortable.
The control of temperature means the control of comfort.
Air conditioning is a method of controlling heat.
When is heat hot?
When is heat cold?
All substances contain heat. Something "feels" hot when it is warmer than our body
temperature. When something contains less heat than our bodies, we say it feels cold!
Cold is merely the removal of some heat.
Science tells us that a measurement called "Absolute Zero" is the point at which all heat is
removed from an object (approximately -273 C). Any substance above this absolute zero
temperature retains some heat.
The burning of the sun radiates heat to the earth. "
download Automotive Air Conditioning Training Manual