Refrigeration & Air Conditioning Mechanic Red Seal · Question
A positive displacement compressor is operating with a suction pressure of 241 kPa (35 psig) and a discharge pressure of 1379 kPa (200 psig). If the suction line temperature is 10°C (50°F) and the corresponding saturated suction temperature for the refrigerant (R-404A) is -7°C (19°F), what is the superheat at the compressor inlet?
The superheat at the compressor inlet is the difference between the actual suction line temperature and the saturated suction temperature. So, 10°C - (-7°C) = 1
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Question: A positive displacement compressor is operating with a suction pressure of 241 kPa (35 psig) and a discharge pressure of 1379 kPa (200 psig). If the suction line temperature is 10°C (50°F) and the corresponding saturated suction temperature for the refrigerant (R-404A) is -7°C (19°F), what is the superheat at the compressor inlet?
Answer options:
- 3°C (5.4°F)
- 10°C (18°F) ✅ 17°C (30.6°F)
- -7°C (-12.6°F)
Correct answer: 17°C (30.6°F)
Explanation: The superheat at the compressor inlet is the difference between the actual suction line temperature and the saturated suction temperature. So, 10°C - (-7°C) = 17°C.
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