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Alternative Refrigerants & Transitions Flashcards

7 cards from real CFC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Alternative Refrigerants & Transitions flashcards as text

  1. R-410A is classified as which type of refrigerant blend?

    Answer: Zeotropic blend

    R-410A is a zeotropic (near-azeotropic) HFC blend of R-32 and R-125 that exhibits some temperature glide.

  2. Which property of HFO refrigerants contributes most to their low Global Warming Potential (GWP)?

    Answer: They degrade quickly in the atmosphere

    HFOs have a very short atmospheric lifetime (days) because they break down rapidly in the troposphere, resulting in very low GWP values.

  3. What is the primary reason R-22 systems cannot simply be retrofitted with R-410A?

    Answer: R-410A operates at much higher pressures

    R-410A operates at pressures approximately 70% higher than R-22, requiring equipment rated for higher pressure ratings.

  4. R-407C was developed primarily as a drop-in replacement for which refrigerant?

    Answer: R-22

    R-407C is an HFC blend designed to approximate R-22 performance characteristics for retrofit applications in air conditioning systems.

  5. What does the term 'temperature glide' refer to in refrigerant blends?

    Answer: The difference in boiling temperature between the lightest and heaviest components during phase change

    Temperature glide is the difference in saturation temperatures between the dew point and bubble point of a zeotropic blend during evaporation or condensation.

  6. Which refrigerant is classified as A2L (mildly flammable) and used as a replacement for R-22 in some applications?

    Answer: R-32

    R-32 is classified A2L due to its mild flammability and is used as a replacement for R-22 and R-410A, with a GWP of 675.

  7. When transitioning a system from R-404A to a lower-GWP alternative, which step is most critical before introducing the new refrigerant?

    Answer: Recovering all R-404A and flushing residual oil if required

    Complete recovery of the existing refrigerant and flushing mineral or alkylbenzene oil prevents contamination and ensures proper miscibility with the new refrigerant's required oil.