Theory of Refrigeration

Temperature – thought of as a description of the level of heat & heat intensity

•  Level of heat should never be confused with the amount of heat or heat content

•  Heat is thought of as energy in the form of molecules in motion

•  Therefore the start of molecular motion is 460 F absolute zero

•  At 29.92 water coils at 212 F

•  The term used to identify the quantity of heat or heat content is known at the British thermal unit

•  Conduction heat transfer is the energy actually traveling from one molecule to another

•  Convection heat transfer using heat moved from one location to another by means of currents set up in a fluid medium (mediums most common are air and water)

•  Radiation use of the sun to transfer heat and is the only type of heat transfer that can travel through a vacuum (does not depend on matter) Every time the distance away is doubled you lose ¼ of the heat intensity

•  Atmospheric pressure is approximate. 14.7 PSI ( so if gauge pressure is 50.3 PSIG then it becomes 65 PSIA