EPA EPA Refrigerant Types and Properties 1 — Questions and Answers
Question 1: Which refrigerant class has the highest ozone depletion potential (ODP)?
- CFCs (chlorofluorocarbons) (Correct answer)
- HCFCs (hydrochlorofluorocarbons)
- HFCs (hydrofluorocarbons)
- HFOs (hydrofluoroolefins)
Correct answer: CFCs (chlorofluorocarbons)
CFCs have the highest ODP because they contain chlorine atoms that are very effective at destroying stratospheric ozone.
Question 2: What is the global warming potential (GWP) of R-22 compared to CO2?
- 1,810
- 2,088 (Correct answer)
- 1,500
- 980
Correct answer: 2,088
R-22 has a GWP of 1,810 relative to CO2 over a 100-year timeframe, meaning it is about 1,810 times more potent as a greenhouse gas.
Question 3: Which refrigerant is classified as an HFO and has a GWP of less than 1?
- R-410A
- R-134a
- R-1234yf (Correct answer)
- R-32
Correct answer: R-1234yf
R-1234yf is an HFO refrigerant with a GWP of approximately 4, making it nearly climate-neutral compared to most other refrigerants.
Question 4: What does the term 'azeotropic' mean when describing a refrigerant blend?
- The blend separates into components when leaked
- The blend behaves as a single refrigerant with a fixed boiling point (Correct answer)
- The blend has a high temperature glide
- The blend requires special recovery equipment
Correct answer: The blend behaves as a single refrigerant with a fixed boiling point
An azeotropic blend behaves like a pure refrigerant with a fixed boiling point, meaning its composition does not change significantly during evaporation or condensation.
Question 5: R-410A is classified as which type of refrigerant?
- CFC
- HCFC
- HFC zeotropic blend (Correct answer)
- HFO
Correct answer: HFC zeotropic blend
R-410A is an HFC zeotropic blend of R-32 and R-125, meaning it has zero ozone depletion potential but a high GWP of approximately 2,088.
Question 6: Which property defines a refrigerant's 'temperature glide'?
- The difference between the refrigerant's critical and boiling temperatures
- The temperature range over which a zeotropic blend evaporates at constant pressure (Correct answer)
- The rate at which refrigerant cools the evaporator coil
- The superheat required at the compressor inlet
Correct answer: The temperature range over which a zeotropic blend evaporates at constant pressure
Temperature glide is the difference between the dew point and bubble point of a zeotropic refrigerant blend as it changes phase at constant pressure.
EPA EPA Refrigerant Types and Properties 1
Which refrigerant class has the highest ozone depletion potential (ODP)?