GARDEN CITY, KANSAS

AMMONIA REFRIGERATION

SYLLABUS

OPERATOR I 2002-2003

This course is the foundation course to prepare the ammonia refrigeration operator to be knowledgeable and proficient in the safe, effective and efficient operation of industrial refrigeration systems.

This course covers the fundamental items and concepts used by the refrigeration plant operator in the course of duty, the refrigeration cycle, physical properties of various refrigerants, refrigerant performance tables, compressor types, compressor operation and maintenance, lubrication, cooling units, condensers and high pressure receivers and purging non-condensable gases from the refrigeration system. Diagrams, tables, study questions, exams and a glossary help the student bring key concepts into focus.

Industrial Refrigeration I published by the Refrigerating Engineers and Technicians Association (RETA) Organization

Additional materials include diagrams and industry equipment.

None

Upon completion of this course the student will:

Definition of Refrigeration

Refrigeration Cycle

Properties of Refrigerants

Saturated Refrigerant Tables

Refrigeration Compressor Types

Operation and Maintenance of Compressors

Lubrication

Cooling Units

Condensers and High Pressure Receivers

Purging

See accompanying profile sheet for complete listing

of competencies.

Students will complete verbal, written, or hands-on activities.

Instruction in this course will be a combination of classroom lecture, demonstration by qualified individuals, hands-on lab experiences, and various reading assignments.

 

Measurement of a student's ability will consist of written tests over all material listed above, oral reports focusing on student understanding of lab assignments and demonstrations, and completion of competencies listed for this class.

COGNITIVE

 

The student will be given written tests and research questions to measure and reinforce his ability to find in formation. The emphasis will be on the process of finding and using information and not memorizing it.

METACOGNITIVE

 

The student will be expected to perform tasks using the publications available to him as his guide. These tasks may take the form of setting up equipment or performing some procedure outlined in the manuals. Written tests will contain questions requiring the student to use information from several sources in order to determine a solution to the problem. Students will be expected to answer the "why does" questions using their personal experience, knowledge developed in class, and information found in other disciplines.

AFFECTIVE

 

Attendance will be monitored, sometimes in the form of quizzes, to determine any problems that may be developing within the student.

 

 

The student will be expected to perform tasks using the knowledge they have acquired in class and the information found in the manuals. The student will be expected to physically perform tasks even though he may not be able to do this without guidance from the instructor and fellow students.

 

The affective and skill domains will be further evaluated during the internship periods in which the sponsoring dealer evaluates the student.

 

 

3 Mastered

2 Competent

1 Needs additional training

N No exposure

3 2 1 N Explain the difference between sensible heat and latent heat

3 2 1 N Explain relationship between force and pressure

3 2 1 N Explain the difference between heat and temperature

3 2 1 N Describe the condition of refrigerant liquids and vapors in terms of heat, temperature, and pressure

3 2 1 N Discuss the duties of a refrigeration operator/technician

3 2 1 N Use sensible heat and latent heat formulas to calculate refrigeration loads

Refrigeration Cycle

3 2 1 N Explain the steps in the refrigeration cycle

3 2 1 N Discuss system factors affecting the refrigeration cycle

3 2 1 N Understand the state of refrigerant at different key points in the cycle

3 2 1 N Be able to use the terms: evaporating pressure and temperature, condensing pressure and temperature, discharge pressure and temperature, suction pressure and temperature, saturated liquid or vapor, sub-cooled liquid and superheated vapor when discussion the state of refrigerant at different key points in the cycle

3 2 1 N Identify and draw a basic mechanical refrigeration system with its four basic components

Properties of Refrigerants

3 2 1 N Explain how a particular refrigerant is selected over the dozens that are available

3 2 1 N Define some important terms used and provide a better understanding of a refrigerant’s performance throughout the mechanical refrigeration cycle

3 2 1 N Explain important safety, environmental, and legal considerations in the operation and maintenance of industrial refrigeration systems

3 2 1 N Calculate refrigeration rates, flow rates, volume, and weight using specific volume, refrigerating effect, and mass flow rate for a particular refrigerant

Saturated Refrigerant Tables

3 2 1 N Read pressures and temperatures from a pressure/temperature table

3 2 1 N Explain how the refrigerant tables can help in analyzing system performance

3 2 1 N Use the refrigerant table in analyzing system performance

Refrigeration Compressor Types

3 2 1 N Describe the function and types of compressors in refrigeration systems

3 2 1 N Compare the methods used to accomplish compression and the different approaches to capacity control

3 2 1 N Explain the operating limits for the various styles of compressors

3 2 1 N Explain differences between booster compressors and high stage compressors

Operation and Maintenance of Compressors

3 2 1 N Explain duties and responsibilities of the operating engineer

3 2 1 N Explain safe procedures for starting, maintaining, and operating a safe and efficient refrigeration system

Lubrication

3 2 1 N Explain the functions of lubricating oil in a refrigeration system

3 2 1 N Explain precautions required when storing refrigeration system lubricating oil

3 2 1 N Explain the lubrication systems used on different types of compressors

3 2 1 N Explain methods of separating lubrication oil and refrigerants

3 2 1 N Explain why low vapor pressure is important in a refrigeration system lubricating oil

3 2 1 N Explain the importance of, and the dangers associated with draining oil

Cooling Units

3 2 1 N Explain evaporator configuration for various types of cooling

3 2 1 N Explain the function of a secondary coolant

3 2 1 N Explain coil defrost

3 2 1 N Explain the steps involved in the service and maintenance of evaporators

Condensers and High Pressure Receivers

3 2 1 N Explain the condensing process

3 2 1 N Describe the three major types of condensers

3 2 1 N Explain the steps involved in the service and maintenance of condensers

3 2 1 N Describe the high pressure receiver functions and types

3 2 1 N Compare wet bulb temperature vs. dry bulb temperature

Purging

3 2 1 N Explain the problems associated with non-condensable gasses

3 2 1 N Explain the sources of non-condensable gasses

3 2 1 N Explain the operation of various types of purgers