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Refrigeration Fundamentals Part 1 Heat and Heat Transfer

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What is Refrigeration?

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DEFINITION ‘Refrigeration’… …is the transfer of heat from a place where it is ‘not wanted’… … to a place where it is ‘unobjectionable’.

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HEAT REMOVAL If heat is removed from inside the container ‘faster’ than it enters...

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WHAT IS HEAT? A Form of Energy It Exists ‘Everywhere’ It Exists at ‘All Temperatures’…Except… Absolute Zero (-459º F / -273º C) It can be Moved from ‘Place to Place’

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WHAT ARE REEFERS? Machines that ‘Move Heat’

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‘HOW’ DOES HEAT MOVE? Warmer  Colder - ALWAYS!!!!!!!

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‘HOW’ DOES IT MOVE? Heat can move three (3) ways…. 1. Conduction 2. Convection 3. Radiation

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CONDUCTION Heat moves through Solids & Liquids

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CONDUCTION Heat will move Between Solids and / or Fluids in direct contact with one another

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CONDUCTION

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Any other Examples of Conduction?

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CONVECTION Definition - Heat transfers via the circulation (movement) of a fluid. i.e….. Air is a fluid Refrigerant Liquid & Vapor are fluids Types ‘Natural’ Convection ‘Forced’ Convection

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‘NATURAL’ CONVECTION

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‘NATURAL’ CONVECTION

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‘FORCED’ CONVECTION

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‘FORCED’ CONVECTION

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Any other Examples of Convection?

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RADIATION Moves in Straight Lines… like light Does not heat the air it passes through Raises temperature of the substance that absorbs it Dark colors absorb ‘more’ heat… Light colors absorb ‘less’ heat