Fun With Unit 21
The household refrigerator fresh-food compartment typically ranges from ____.
28 to 40°F
An evaporator that has stamped refrigerant passages in sheet steel or aluminum.
Stamped Evaporator
The process of removing heat from a place where it is not wanted and transferring that heat to a place where it makes little or no difference is known as ____.
refrigeration
Allows you to see if a system is operating properly
Function of the Sight Glass
What does a high evaporator superheat indicate?
A starved evaporator
A refrigeration system designed for the storage of flowers or candy is considered a ____ type.
high temperature
The refrigerant when all of the liquid has just changed to a vapor.
Saturated vapor
The household refrigerator fresh-food compartment is a good example of ____
medium-temperature refrigeration
Cleans refrigerant of contaminates
Function of the Drier
Reduces pressure drop through larger evaporators.
multi-circuit evaporator
The boiling temperature and its relationship to the system exist in the ____.
evaporator
Saturated refrigerant vapors being compressed by the compressor, which will turn into liquid refrigerant droplets when compressed.
Wet compression
Low-temperature food storage applications generally start at ____.
0°F
Rejects heat, changing the refrigerant from a vapor to a liquid
What the condenser does.
An evaporator that does not operate flooded is thought of as what type of evaporator?
A dry-type evaporator
If an evaporator has a pressure drop of 10 psig and the low side pressure is 15 psig, what is the pressure at the inlet of the evaporator?
25 psig
The condition in the evaporator when the metering device is not feeding enough refrigerant to the evaporator.
Starved Coil
A refrigeration system designed for the storage of flowers or candy is considered a ____
high temperature type
Absorbs heat, changing the refrigerant from a liquid to a vapor
What the evaporator does
The best heat exchange occurs between
two liquids
A typical superheat for an evaporator operating under normal conditions would be ____.
8 to 12°F
A cleaning of the compressor's bearing surfaces, which causes lack of lubrication. It is usually caused by liquid refrigerant mixing with the compressor's crankcase oil due to liquid floodback or migration.
Bearing washout
If an evaporator has a pressure drop of 10 psig and the low side pressure is 15 psig, what is the pressure at the inlet of the evaporator?
25 psig
A condenser that must be cleaned chemically
Shell-and-Coil
The difference in the amount of heat (in Btu/lb) that the refrigerant contains at the point where it enters the evaporator and the point at which it leaves the evaporator is known as ________.
the net refrigeration effect