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.