Refrigeration & Air Conditioning Mechanic Red Seal · Question
A Pressure-Temperature chart for R-410A shows that at 1500 kPa gauge, the saturated temperature is 30°C. If a technician measures the liquid line temperature at 25°C near the EEV (Electronic Expansion Valve) inlet, what can be concluded?
Subcooling is achieved when the actual liquid temperature is below the saturated condensing temperature at that pressure. Here, 30°C - 25°C = 5 K subcooling.
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Question: A Pressure-Temperature chart for R-410A shows that at 1500 kPa gauge, the saturated temperature is 30°C. If a technician measures the liquid line temperature at 25°C near the EEV (Electronic Expansion Valve) inlet, what can be concluded?
Answer options:
- The refrigerant is superheated by 5 K. ✅ The refrigerant has 5 K of subcooling.
- The refrigerant is in a saturated vapour state.
- The EEV is undersized.
Correct answer: The refrigerant has 5 K of subcooling.
Explanation: Subcooling is achieved when the actual liquid temperature is below the saturated condensing temperature at that pressure. Here, 30°C - 25°C = 5 K subcooling.
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- Which of the following refrigerants is a hydrofluorocarbon (HFC) and has a high ozone depletion potential (ODP
- Which component is responsible for compressing the refrigerant vapour to a high pressure and temperature?
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