Overview
Most people think the refrigeration system’s job is simply to make an object “cold”. However, it is more accurate to say that a “cold” object contains less concentrated or less intense heat than a warmer object used for comparison. Thermodynamically speaking, there’s no such thing as “cold”. Rather, one object has less heat than another object.
Heat cannot be destroyed or lost, but it can be transferred from one body to another or to another form of energy. Even though it is easier to think of refrigeration as the process of making things cold, it actually is the process of transferring heat from one place to another. It could also be said that refrigeration is the transfer of heat from one place where it is not wanted (a walk-in cooler), to another less objectionable place (outdoors).
One way to achieve this objective is by using a “mechanical refrigeration system.” Another method is by employing a “vapor absorption system.” The mechanical refrigeration system, which is the focus of this course, is the most common and practical method generally in use. It consists of 4 essential components:
- An Evaporator to absorb heat into the refrigerant system
- A Condenser to reject the heat from the refrigerant system
- A Compressor to establish the pressures required to force the heat to travel "uphill."
- A Liquid Metering Device to regulate the flow of refrigerant and to establish two pressure zones.
The normal strategy is to get the heat to the refrigerant in an evaporator and then transfer the refrigerant to a condenser where the heat can be removed from it. It is this cycle that moves heat from one place to another.
Above is just a very quick introduction to mechanical refrigeration systems. This 5-hour course provides more detailed information on the heat and refrigeration principles, refrigeration system components, types of refrigerants, and the methods for installing, maintaining, servicing and repairing refrigeration systems.
The Course is based entirely on US Navy course - Utilitiesman Basic Volume 2: NAVEDTRA 14279, Chapter 6 titled “Refrigeration.”
The student must take a multiple-choice quiz consisting of twenty five (25) questions at the end of this course to obtain PDH credits.
Specific Knowledge or Skill Obtained
This course teaches the following specific knowledge and skills:
- The concepts of heat theory and the basic principles of refrigeration
- Different types of refrigeration system components and their operation
- Classifying common refrigerants according to their application
- The requirements for Ozone protection and the Clean Air Act
- The safety requirements for handling and storage of refrigerants
- The basic types of commercial and domestic refrigeration equipment
- Basic requirements for the installation of refrigeration equipment
- Different types of maintenance equipment and methods for basic maintenance, service and repair of refrigeration systems and components
- The importance and use of maintaining, operating and inspecting logs for refrigeration equipment
Course
Click on the following link to the PDF document to review the course material before taking the quiz for credit.
Utilitiesman Basic Volume 2: NAVEDTRA 14279, Chapter 6
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