Operating a vapor-compression refrigeration system with superheated refrigerant returning to the compressor increases which major risk?

💡 Explanation

When superheated refrigerant enters the compressor, it undergoes further compression, leading to extremely high discharge temperatures, because the superheat adds to the heat of compression, stressing valves. Therefore, thermal stress on discharge valves increases, rather than other listed choices as they need system-wide adjustments or different independent causes.

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