




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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Learning Objectives
• Refrigerant safety • Types of refrigerants • Refrigerant blends • Subcooled liquids • Superheated vapors • Boyle’s law
Specs
Course Level | Intermediate |
Languages | English |
Compatibility | Audio, Video |
Based on: | Industry Standards and Best Practices |
Key Questions
Does “evaporation” occur on the low pressure side or high pressure side of the refrigeration cycle?
The low pressure evaporator side is where the refrigerant evaporates from a liquid to a gas.
Does “condensation” occur on the low pressure side or high pressure side of the refrigeration cycle?
The high pressure condenser side is where the refrigerant condenses from a gas to a liquid.
What is a vapor pressure curve?
It is a curve that shows the relationship between pressure and boiling point temperature for a particular substance.
What should you consider when selecting a refrigerant?
The pressures in the system, desired temperature in the refrigerated space, and temperature range of the outside fluid (air or water) must all be considered.
Why is it desirable for the refrigerant in the line going to the compressor to contain some superheat?
This prevents liquid refrigerant from reaching the compressor, which can damage it, and it also increases the total amount of heat removed from the refrigerated space.
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.
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