What is the primary design challenge for CO2 refrigeration ...

[SO00]

What is the primary design challenge for CO2 refrigeration systems?
 
  A) The high refrigerant cost
  B) The high GWP of CO2 refrigerant
  C) CO2 refrigerant operates in a vacuum at low temperatures.
  D) The high operating pressures of CO2 refrigerant

Question 2

What type of refrigerants are normally used in CO2 cascade refrigeration systems?
 
  A) CO2 refrigerant in the high-temperature system and HFC refrigerant in the low-temperature system
  B) HFC refrigerant mixed with CO2 in both systems
  C) HFC refrigerant in the high-temperature system and CO2 in the low-temperature system
  D) CO2 refrigerant in both the high- and low-temperature systems

[dudman123]

Answer to Question 1

D

Answer to Question 2

C

[SO00]

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[dudman123]

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