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Refrigeration

FPE Final Exam

Refrigerants have a large _____ _____ and low _____ ______. latent heat, boiling point
Define latent heat. A quantity of heat added or removed during a phase change.
The boiling point for a refrigerant can be adjusted by changing ______. pressure
The freezing temperature of a refrigerant should be below the _____ temperature. evaporator
T or F: The critical temperature for a refrigerant should be sufficiently low. False
____ as a refrigerant has a very high latent heat of vaporization. Ammonia
What happens in the evaporator of a refrigeration system? Liquid refrigerant vaporizes to a gaseous state.
T or F: Refrigerator space decreases the temperature of the surroundings. True
What are the two types of evaporators for a refrigeration system? Direct-expansion, indirect-expansion
T or F: Direct-expansion evaporators are used when cooling is desired in several locations in a system. False
Refrigerant enters the compressor in a ____ state at ____ pressure and temperature. vapor, low
The compressor raise the _____ and _____ of the refrigerant. pressure, temperature
What are the three types of compressors? Reciprocating, centrifugal, rotary
What is the purpose of a condenser in a refrigeration system? Transfers heat from the refrigerator to another medium.
What is the purpose of an expansion valve in a refrigeration system? Controls the flow of liquid refrigerant to the evaporator.
Define flashing. When the heat given up by refrigerant is used to convert some liquid into vapor.
Define cooling load. The rate of heat energy removed from a given space in order to lower the temperature of that space to a desired level.
Multi-stage refrigeration systems involve more than one _____. compressor
T or F: Multi-stage refrigeration systems cause an decrease in total power requirement. True
Created by: goberoi
 

 



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