Lesson 1 - Reciprocating Compressors

Topics:

Features of industrial ammonia reciprocating compressors; Capacity control; Lubrication; Efficiency; Application data; Compound compressors

Learning Objectives:
– Briefly describe the evolution of ammonia reciprocating compressors.
– Describe typical design features of today's reciprocating compressors.
– Explain how capacity control and proper lubrication are achieved in ammonia reciprocating compressors.
– Explain how to use volumetric and adiabatic efficiency data and the performance factor in sizing or selecting compressors for an application.
– Describe the function and basic design requirements of internally compounded reciprocating compressors.


Lesson 2 - Sliding-Vane Rotary Booster Compressors -

Topics:

Rotary vane compressor design and operation; Fixed volume ratio; Applicability; Limitations; Capacity control

Learning Objectives:
– Describe the basic operation of sliding-vane rotary booster compressors.
– Explain the principle of fixed volume ratio compressors.
– Describe typical rotary compressor design features.
– Explain why sliding-vane rotary compressors have been replaced by screw compressors.
– Discuss the reasons for rotary vane compressor speed limitations and the causes and effects of blade wear.
– Describe how capacity control is achieved in rotary compressors.


Lesson 3 - Oil-Flooded Screw Compressors

Topics:

Oil-flooded screw compressor operation; Fixed volume ratio; Capacity control in fixed - variable compressors; Efficiency; Compound compressors; Application criteria

Learning Objectives:
– Discuss the developments that led to the use and acceptance of the oil-flooded screw compressor in industrial refrigeration.
– Describe typical design features of single-screw and twin helical screw compressors.
– Explain how the compression system works within screw compressors.
– Compare fixed and variable volume machines and their applications.
– Explain how the capacity-control slide valve and variable Vi slide stop function.
– Describe the general range of application for screw compressors.


Lesson 4 - Screw Compressor Units

Topics:

Screw compressor systems; Drive systems; Lubrication, refrigerant/oil separation - oil cooling, economizer/side load, capacity control, microprocessor control, and safety systems

Learning Objectives:
– Explain why screw compressors are provided as units and describe the main systems that make up the screw compressor unit.
– Explain why a vertical or horizontal oil separator may be preferred and explain why check valves are used on the unit inlet and outlet connections.
– Discuss drive methods and oil distribution methods used on screw compressors and describe tasks provided by the lubricant within the compressor.
– Explain how the refrigerant vapor/oil separation system operates and list the methods and benefits of oil cooling in screw compressor units.
– Discuss the beneficial uses of the side port and the operation of the screw compressor capacity reduction slide valve control system.
– Name the codes and other criteria with which ammonia refrigeration systems must comply to establish and maintain a safe work environment.


Lesson 5 - Ammonia Systems Lubrication/Oil Management

Topics:

Need for lubrication; Miscibility; Viscosity; Lubricants and oils; Lubricant selection - handling and management; Separators; Low-side oil recovery

Learning Objectives:
– Discuss the purposes of lubricants in ammonia systems.
– Define the terms used to describe and specify lubricants and oils and discuss the importance of the miscibility and viscosity relationships between
   lubricants and ammonia.
– Describe the proper methods for handling lubricants.
– Explain how oil is separated from the refrigerant vapor within the screw compressor system.
– Describe the IIAR-approved method for removing oil from the system low-side oil pots.
– Name lubricants recommended for use with ammonia systems and explain the importance of using only specified lubrication products.