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Questions and Answers
Which ASHRAE classification means slightly flammable?
Which ASHRAE classification means slightly flammable?
- B1
- A2 (correct)
- B2
- A1
Silicone elastomers, for use in seals and gaskets, are not compatible with which refrigerants?
Silicone elastomers, for use in seals and gaskets, are not compatible with which refrigerants?
- HFCs
- HFOs (correct)
- CFCs
- HCFCs
HCFCs contain:
HCFCs contain:
Hydrogen, chlorine, fluorine and carbon.
What does the term 'recycle' mean in refrigerant processing?
What does the term 'recycle' mean in refrigerant processing?
List an example of an HFO refrigerant.
List an example of an HFO refrigerant.
Which type of refrigerant contains no chlorine?
Which type of refrigerant contains no chlorine?
What is the Significant New Alternatives Policy (SNAP) Program?
What is the Significant New Alternatives Policy (SNAP) Program?
Before shipping any used refrigerant cylinders, what standards should be checked?
Before shipping any used refrigerant cylinders, what standards should be checked?
The low-side test-pressure data-plate value should be used for?
The low-side test-pressure data-plate value should be used for?
A single chlorine atom can destroy how many ozone molecules?
A single chlorine atom can destroy how many ozone molecules?
HFCs ________.
HFCs ________.
Crop loss, eye disease, and skin cancer have been attributed to:
Crop loss, eye disease, and skin cancer have been attributed to:
How much can a person be fined per day per violation for knowingly releasing a regulated substance that violates the Clean Air Act?
How much can a person be fined per day per violation for knowingly releasing a regulated substance that violates the Clean Air Act?
The proper disposal method for ____________ is to recover any remaining refrigerant, render the cylinder useless and then recycle the metal.
The proper disposal method for ____________ is to recover any remaining refrigerant, render the cylinder useless and then recycle the metal.
Which of the following has the highest Ozone Depletion Potential?
Which of the following has the highest Ozone Depletion Potential?
Which refrigerant has a GWP closest to '1'?
Which refrigerant has a GWP closest to '1'?
The chlorine in CFCs and HCFCs:
The chlorine in CFCs and HCFCs:
A refrigerant cylinder designed to hold recovered refrigerant has a:
A refrigerant cylinder designed to hold recovered refrigerant has a:
An ozone molecule contains:
An ozone molecule contains:
The compressor ____________________________________.
The compressor ____________________________________.
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Study Notes
ASHRAE Classifications
- A2L classification indicates slightly flammable refrigerants.
- Refrigerants classified by toxicity: Class A (safest) and Class B (toxic).
- Flammability levels: 1 (no), 2 (low), and 3 (high).
Compatibility of Elastomers
- Silicone elastomers are not compatible with HFO refrigerants.
Composition of HCFCs
- HCFC refrigerants are composed of hydrogen, chlorine, fluorine, and carbon.
Refrigerant Recycling Process
- Recycling involves cleaning refrigerant by separating oil and removing moisture using filter driers.
- Reduces acidity, moisture, and particulate matter in refrigerants.
Examples of HFO Refrigerants
- R-1234ze is an example of an HFO refrigerant.
Characteristics of HFCs
- HFCs consist of hydrogen, fluorine, and carbon.
- They do not contain chlorine, thus not contributing to ozone layer depletion, but have a high Global Warming Potential (GWP).
Significant New Alternatives Policy (SNAP)
- The SNAP program is an EPA initiative focused on refrigerants with reduced environmental and health risks.
Standards for Shipping Used Refrigerant Cylinders
- Compliance with Department of Transportation standards is required before shipping.
Leak Testing Regulations
- Use the low-side test-pressure data-plate value to determine safe leak testing pressure.
Ozone Depletion by Chlorine
- One chlorine atom can destroy up to 100,000 ozone molecules and can remain in the stratosphere for 120 years.
HFCs and Ozone Depletion
- HFCs do not harm stratospheric ozone but have a significant Global Warming Potential.
Consequences of Ozone Depletion
- Crop losses, eye diseases, and increased skin cancer are linked to the depletion of stratospheric ozone.
Fines for Clean Air Act Violations
- Violators can be fined $44,539 per day for knowingly releasing regulated substances.
Disposal of Disposable Refrigerant Cylinders
- Recover refrigerant before disposal, render the cylinder useless, and recycle the metal.
Ozone Depletion Potential (ODP) of Refrigerants
- CFCs are known for having the highest Ozone Depletion Potential among refrigerants.
GWP of Refrigerants
- R-1233zd has a GWP very close to 1, making it relatively environmentally benign.
Behavior of Chlorine in Refrigerants
- Chlorine in CFCs and HCFCs does not dissolve in water, preventing it from being removed from the atmosphere via rain.
Identification of Recovery Cylinders
- Refrigerant cylinders for recovered refrigerant are designed with a grey body and yellow top.
Nature of Ozone
- Ozone is made of three oxygen atoms (O3) and protects against harmful UV radiation while helping stabilize Earth’s temperature.
Function of Refrigeration Compressors
- The compressor in a refrigeration cycle converts low-pressure vapor into high-pressure vapor, serving a critical role in the vapor-compression process.
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