Objectives

• After studying this unit, you should be able to
• discuss applications for high-, medium-, and low-temperature refrigeration.
• describe the term ton of refrigeration.
• describe the basic refrigeration cycle.
• explain the relationship between pressure and the boiling point of water or other liquids.
• describe the function of the evaporator or cooling coil.
• explain the purpose of the compressor.
• list the compressors normally used in residential and light commercial buildings.
• discuss the function of the condensing coil.
• state the purpose of the metering device.
• list four characteristics to consider when choosing a refrigerant for a system.
• list the designated colors for refrigerant cylinders for various types of refrigerants.
• discuss different refrigerants and their applications.
• describe how refrigerants can be stored or processed while refrigeration systems are being serviced.
• plot a refrigeration cycle for refrigerants (R-22, R-134a, and R-502) on a pressure/enthalpy diagram.
• plot a refrigeration cycle on a pressure/enthalpy diagram for refrigerant blends R-404A and R-410A.
• plot a refrigeration cycle on a pressure/enthalpy diagram for a refrigerant blend 

Advance to the Leaning Center Dashboard and complete the lessons.