Unit 21
True
(T/F) A stamped plate evaporator usually does not use a fan to move air across it.
False
(T/F) Every central split cooing system manufactured in the USA today must have a Seasonal Energy Efficiency Ratio (SEER) of at least 10.
True
(T/F) The capacity (tonnage) of the heat exchanger can vary depending on it's dimensions.
True
(T/F) The film factor is a relationship between the medium giving up heat and the heat-exchange surface.
True
(T/F) The refrigeration evaporator is a component that absorbs heat from the conditioned space into the refrigeration system.
True
(T/F) To check the performance of a dry-type evaporator, the service technician would first make sure that the refrigerant coil is operating with enough liquid inside.
Dry type Evaporator
A direct expansion-type evaporator is also called a ____.
High Temperature
A refrigeration system designed for the storage of flowers or candy is considered a _____ type.
40 F
A typical evaporator operating temperature in an air-conditioning system is _____.
8 to 12 F
A typical superheat for an evaporator under normal conditions would be ____.
Flooded evaporators
Evaporators that are operated full of liquid and are equipped with a device to keep the liquid refrigerant from passing to the compressor are known as _____.
47 to 60 F
High-temperature refrigeration applications will normally provide box temperatures of ____.
25 psig
If an evaporator has a pressure drop of 10 pig and the low side pressure is 15 psig, what is the pressure at the inlet of the evaporator?
Defrost
If the application requires a coil design to operate below freezing, there must be provision for ____.
0 F
Low temperature food storage applications generally start at ____.
Evaporator
The ____ in a refrigeration system is responsible for absorbing heat into the system from whatever medium is to be cooled.
Boiling Temperature
The ____ of the liquid refrigerant determines the coil operating temperature.
Evaporator
The boiling temperature and its relationship to the system exist in the ____.
Medium Temperature
The household refrigerator fresh-food compartment is a good example of ____ refrigeration.
28 to 40 F
The household refrigerator fresh-food compartment typically ranges from _____.
Refrigeration
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 ____.
Superheat
_____ is the best method of checking to see when a refrigerant coil has a proper level of refrigerant.