Refrigeration Components

SKU: RVI-11518Duration: 20 Minutes

In the vapor-compression refrigeration cycle, a "refrigerant" alternately absorbs and rejects heat as it circulates through four components - an evaporator, compressor, condenser, and metering device - changing pressure, temperature, and phases along the way. This interactive online course discusses different types of refrigeration systems and their components. It also discusses metering devices, compressors, and non-condensable gases.

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Hermetic compressor with internal compoents exposed.

Refrigerant system compressor types: reciprocol/piston, rotary, screw, scroll, and centrifugal.

Purge unit exposing evporator coil. Air and refrigerant from condenser are drawn into the tank and condense on the cool evaporator coil surface.

Course Details

Specs

Training Time: 20 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Learning Objectives

List the components of a refrigeration system
Describe the purpose of each of the key metering devices used in a refrigeration system
Discuss the purpose of the purge unit
Explain the differences between hermetic, serviceable hermetic, and open compressors

Key Questions

The following key questions are answered in this module:

What is the purpose of a compressor?
The compressor is a pump that increases the pressure of the cold gas refrigerant before it reaches the condenser. The work done by the compressor also raises the temperature of the refrigerant gas.

Can you explain the purpose of the evaporator and condenser?
The evaporator and condenser are named for the changes that occur to the refrigerant inside these units. The refrigerant evaporates, or changes from a liquid to a gas, in the evaporator, and it condenses, or changes from a gas to a liquid, in the condenser.

What types of cooling systems are used in commercial and industrial HVAC applications?
Two types of cooling systems are used in commercial and industrial HVAC applications: direct expansion or DX systems, and chilled water or chiller systems. Both systems use the vapor-compression refrigeration cycle to transfer heat energy from indoors to outdoors.

Positive displacement is one of the two primary types of compressors. What is the other type?
The two primary types of compressors are positive displacement and centrifugal.

Air can enter a refrigeration system when it is open for repairs or service. What could be used to remove it?
If air does get into a system, a portable purge unit can be connected to the condenser or receiver to remove it.

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

Compressor housings can be hermetic, semi-hermetic, or open. In hermetic systems, the compressor and drive motor are connected to a common shaft and share an air-tight welded metal housing that is never intended to be opened. The motor is cooled by the lubrication system and the cool incoming gas refrigerant. With this design, there is no need for a crankshaft seal, which can be a source of refrigerant leaks. The major disadvantage of hermetic systems is that the entire unit must be replaced if either the compressor or motor fails. Hermetic compressors are widely used in refrigerators, freezers, and air conditioners due to their compact size and relatively long life.

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