CFC Alternative Refrigerants & Transitions 2

Question 1

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

Accepted Answer

Zeotropic blend

Answer

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

Question 2

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

Accepted Answer

They degrade quickly in the atmosphere

Answer

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

Question 3

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

Accepted Answer

R-410A operates at much higher pressures

Answer

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

Question 4

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

Accepted Answer

R-22

Answer

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

Question 5

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

Accepted Answer

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

Answer

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

(CFC) Chlorofluorocarbon Certification Practice Test

(CFC) Chlorofluorocarbon Certification Practice Test

CFC Alternative Refrigerants & Transitions 2