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Principles of Refrigeration


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Learn how a basic chiller works through Bergs School of Cool. To learn more about refrigerants and chillers, please visit:

Published in: Engineering

Principles of Refrigeration

  1. 1. Principles of Basic Refrigeration
  2. 2. What Is A Chiller? Industrially speaking, a chiller is a single component within a more complex mechanical system that is used to remove heat from a process or substance.
  3. 3. Components of a Refrigeration System In order to work properly, a refrigeration system requires four major components connected by tubing or “lines” to make sure the refrigerant doesn’t escape.
  4. 4. Diagram of a Refrigerant Simple System
  5. 5. Chillers come in a variety of shapes and sizes, and the components that make up the process differ between models. Even though they may look different, the principle of their operation and the refrigeration cycle remains the same.
  6. 6. How Does It Work? Let’s look at what happens in a simple refrigeration cycle.
  7. 7. Let’s start our journey through the refrigeration cycle at the metering device. This device controls the flow of refrigerant into the evaporator, or cooling coil, as a low-pressure, low- temperature refrigerant.
  8. 8. From here, the expanding refrigerant changes state as it goes through the evaporator, where it removes the heat from the substance or space in which the evaporator is located.
  9. 9. This process is similar to the change that occurs when a pot of water is boiled on the stove and the water changes to steam - except the refrigerant boils at a much lower temperature.
  10. 10. The low-pressure, low-temperature vapor is now drawn to the compressor where it is compressed into a high-temperature, high-pressure vapor.
  11. 11. The compressor then discharges the refrigerant to the condenser, where it can give up the heat it picked up in the evaporator.
  12. 12. At this point, the refrigerant vapor is at a higher temperature than the air passing through the condenser (air-cooled type); or the water passing through the condenser (water-cooled type); therefore, it transfers the heat from the warmer refrigerant vapor to the cooler air or water.
  13. 13. In this process, as heat is removed from the vapor, the refrigerant is condensed back to liquid, at a high-pressure and high-temperature.
  14. 14. The liquid refrigerant travels back to the metering device, where it passes through a small opening where a drop in pressure and temperature occurs. From here, it enters into the evaporator or cooling coil.
  15. 15. As the refrigerant makes its way into the large opening of the evaporator tubing or coil, it vaporizes, ready to start another cycle through the system.
  16. 16. Learn more about refrigeration Berg Chilling Systems Inc. 51 Nantucket Blvd. Toronto, On, M1P2N5 416-755-2221