Refrigeration & Air Conditioning Mechanic Red Seal · Question
A deep freezer operating with R-448A has a suction pressure of 120 kPa gauge and a liquid line pressure of 1000 kPa gauge. What is the approximate differential saturation temperature across the system? (Assume atmospheric pressure is 101 kPa.)
Suction absolute pressure = 120 + 101 = 221 kPa. For R-448A, saturation temp at 221 kPa is approx. -22°C. Liquid line absolute pressure = 1000 + 101 = 1101 kPa.
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Question: A deep freezer operating with R-448A has a suction pressure of 120 kPa gauge and a liquid line pressure of 1000 kPa gauge. What is the approximate differential saturation temperature across the system? (Assume atmospheric pressure is 101 kPa.)
Answer options:
- 35°C ✅ 42°C
- 48°C
- 55°C
Correct answer: 42°C
Explanation: Suction absolute pressure = 120 + 101 = 221 kPa. For R-448A, saturation temp at 221 kPa is approx. -22°C. Liquid line absolute pressure = 1000 + 101 = 1101 kPa. For R-448A, saturation temp at 1101 kPa is approx. 20°C. Differential = 20°C - (-22°C) = 42°C. This indicates the overall temperature lift duty.
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