Refrigeration & Air Conditioning Mechanic Red Seal · Question
On a Pressure-Temperature (PT) chart for R-22, if the head pressure is 1500 kPa gauge and the corresponding saturated condensing temperature is 45°C, what does it indicate if the liquid line temperature measured near the condenser outlet is 40°C?
Subcooling is the difference between the saturated condensing temperature and the actual liquid line temperature. Here, 45°C - 40°C = 5 K subcooling, indicating
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Question: On a Pressure-Temperature (PT) chart for R-22, if the head pressure is 1500 kPa gauge and the corresponding saturated condensing temperature is 45°C, what does it indicate if the liquid line temperature measured near the condenser outlet is 40°C?
Answer options:
- The refrigerant is superheated by 5 K. ✅ The refrigerant is subcooled by 5 K.
- The expansion valve is flooding.
- The compressor is short cycling.
Correct answer: The refrigerant is subcooled by 5 K.
Explanation: Subcooling is the difference between the saturated condensing temperature and the actual liquid line temperature. Here, 45°C - 40°C = 5 K subcooling, indicating liquid refrigerant beyond the saturation point.
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