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Air & Refrigeration flashcards
Question | Answer |
---|---|
What is resistance measured in? | ohms |
Force times distance equals what? | f x d = work |
What does rpm mean? | rpm= revolutions per minute |
1 horsepower is equal to how many watts? | 1 hp = 746 watts |
What is latent heat of condensation? | latent heat of condensation isamount of heat energy, in btu/lb required to change vapor into a liquid |
What is latent heat of vaporation? | latent heat of vaporation is the amount of heat energy, in btu/lb required to change a substance into a vapor |
What is latent heat? | latent or hidden heat is heat added but no temperature rises |
What is sensible heat? | sensible heat is when temperature changes and can be registered |
What is natural convection? | natural convection is heated air that rises naturally |
What is Convection in dealing with heat? | convection is heat when it is moved from one place to another |
What is conduction when dealing with heat? | conduction is heat when it is moved from one molecule to another |
What is One Ton Of Refrigeration? | in a 24hr period, 144BTU x 2000lbs = 288,000 BTU |
What is a Evaporator? | a evaporator absorbs heat into the system 3 functions 1. absorb heat 2. allow heat to boil off 3. allow heat to superheat refrigerant vapors |
What is a compressor? | also known as a vapor pump, it reduces the pressure on low side and increases the heat on the high side |
What is a reciprocating compressor? | a compressor that uses a piston in a cylinder to compress the refrigerant |