Refrigeration - Refrigerant Selection

SKU: C-843Duration: 37 Minutes

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Language:  English

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Course Details

Specs

Training Time: 37 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Several factors influence refrigerant selection, including: physical, chemical, and thermodynamic properties of the refrigerant; compressor design and system capacity; and stability, toxicity, reactivity, and environmental impacts of the refrigerant. This module discusses the properties of and differences between CFC, HCFC, HFC, HFO, and natural refrigerants. It also explains refrigerant numbering, safety classifications, compatibility with equipment and lubricating oil, and safety guidelines.

Learning Objectives

At the end of this module, you will be able to:

  • List desirable characteristics for refrigerants in vapor-compression refrigeration systems
  • Explain the properties of, and differences between, CFC, HCFC, HFC, HFO, and natural refrigerants
  • Describe how refrigerant identification numbers and safety classifications are assigned
  • Describe compatibility considerations for refrigerants, oils, and system equipment
  • List safety guidelines for the handling and use of refrigerants

Key Questions

The following key questions are answered in this module:

Why are CFC and HCFC refrigerants being phased out?
CFCs and HCFCs are being phased out because they have both high Ozone Depletion Potential (ODP) and high Global Warming Potential (GWP).

What is Ozone Depletion Potential, or ODP?
ODP indicates a refrigerant's ability to destroy ozone in the Earth's upper atmosphere, relative to the ozone-destroying ability of trichlorofluoromethane (R11).

What is Global Warming Potential, or GWP?
GWP indicates a refrigerant's ability to trap heat in the Earth's atmosphere for a specific time period (usually 100 years), relative to the heat-trapping ability of carbon dioxide.

What are HFO refrigerants?
HFO stands for hydrofluoro-olefin. These refrigerants are made up of hydrogen, fluorine, and carbon, and they contain a carbon-carbon double bond.

Can any naturally-occurring substances be used as refrigerants?
Yes, hydrocarbons like propane and isobutane, carbon dioxide, ammonia, and even air are used as refrigerants.

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

Three common types of refrigerants are: • Chlorofluorocarbons, or CFCs, which contain chlorine, fluorine, and carbon • Hydrochlorofluorocarbons, or HCFCs, which contain hydrogen, chlorine, fluorine, and carbon • Hydrofluorocarbons, or HFCs, which contain hydrogen, fluorine, and carbon CFC and HCFC refrigerants were widely used in the 20th century because they are relatively inert, nonflammable, and nontoxic, which made them much safer than early refrigerants, like ammonia (NH3), sulfur dioxide (SO2), and methyl chloride (CH3Cl). However, CFCs and HCFCs are being phased out because it was discovered that they have both high Ozone Depletion Potential (ODP) and high Global Warming Potential (GWP).

Additional Resources

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