Refrigeration – Refrigerant Properties
Care must be taken to insure compatibility among refrigerants, oils, and system components. This course will discuss refrigerant safety, types of refrigerant, and how refrigerant is used.
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Course Details
Learning Objectives
• Refrigerant safety • Types of refrigerants • Refrigerant blends • Subcooled liquids • Superheated vapors • Boyle’s law
Specs
Frequently Asked Questions
Does “evaporation” occur on the low pressure side or high pressure side of the refrigeration cycle?
Does “condensation” occur on the low pressure side or high pressure side of the refrigeration cycle?
What is a vapor pressure curve?
What should you consider when selecting a refrigerant?
Why is it desirable for the refrigerant in the line going to the compressor to contain some superheat?
Sample Video Transcript
For a fixed number of gas molecules (n), the relationship between pressure (P), volume (V), and temperature (T) can be described by the Ideal Gas Law. This law states that if the number of molecules (n) doesn’t change, an increase in the temperature (T) of a gas will cause its pressure (P) and/or volume (V) to increase. (In this equation, R is equal to the gas constant, a value that doesn’t change.) Likewise, a decrease in gas temperature will cause its pressure and/or volume to decrease. So, if a gas is contained in a vessel with a fixed volume (V), a change in temperature (T) will cause a corresponding change in pressure (P). This is why the increase in pressure that is accomplished by the compressor is accompanied by an increase in temperature.
