Refrigeration & Air Conditioning Mechanic Red Seal · Question
A system using R-134a has a design evaporating temperature of 0°C (32°F) and a condensing temperature of 40°C (104°F). If the system is operating with an evaporator pressure of 293 kPa (42.5 psig) and a condenser pressure of 1017 kPa (147.5 psig), and the liquid line temperature leaving the condenser is 35°C (95°F), what is the subcooling?
Subcooling is the difference between the saturated condensing temperature (40°C) and the actual liquid line temperature (35°C). Therefore, 40°C - 35°C = 5°C.
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Question: A system using R-134a has a design evaporating temperature of 0°C (32°F) and a condensing temperature of 40°C (104°F). If the system is operating with an evaporator pressure of 293 kPa (42.5 psig) and a condenser pressure of 1017 kPa (147.5 psig), and the liquid line temperature leaving the condenser is 35°C (95°F), what is the subcooling?
Answer options:
- 0°C (0°F) ✅ 5°C (9°F)
- 10°C (18°F)
- 15°C (27°F)
Correct answer: 5°C (9°F)
Explanation: Subcooling is the difference between the saturated condensing temperature (40°C) and the actual liquid line temperature (35°C). Therefore, 40°C - 35°C = 5°C.
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