Most people think the refrigeration system’s job is simply to remove heat from an object.  Actually there is no such thing “remove” the heat since heat is a form of energy than can’t be destroyed. We can only transfer heat from one place to another. 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 (walk in cooler), to another less objectionable place (outdoors). One way to achieve this objective is by “mechanical refrigeration system” and the other is by “vapor absorption system”. The mechanical refrigeration system is the most common and practical method generally in use. It consists of 4 essential components:

1. An Evaporator to absorb heat into the refrigerant system
2. A Condenser to reject the heat from the refrigerant system
3. A Compressor to establish the pressures required to force the heat to travel "uphill."
4. 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 and remove heat from one place to another. This is just a very quick introduction to mechanical refrigeration system. This 5-hour course provides more detailed information on the heat and refrigeration principles, refrigeration system components, type of refrigerants, methods of installation, maintaining, servicing and repairing the refrigeration systems and is entirely based on US Navy course - Utilitiesman Basic Volume 2: NAVEDTRA 14279 and covers chapter 6 titled “Refrigeration”.

Learning Objectives:

At the successful conclusion of this course, you will learn the following knowledge and skills:

• Understand the concepts of heat theory and state the basic principles of refrigeration
• Understand different types of refrigeration system components and their operation
• Understand and classify common refrigerants according to their application
• Understand the requirements for Ozone protection and the Clean Air Act
• Understand the safety requirements for handling and storage of refrigerants
• Understand and recognize the basic types of commercial and domestic refrigeration equipment
• Understand the basic requirements for the installation of refrigeration equipment
• Understand different types of maintenance equipment and methods for basic maintenance, service and repair of refrigeration systems and components
• Understand the importance and use of maintaining, operating and inspecting logs for refrigeration equipment