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Which risk increases when a refrigeration system uses zeotropic refrigerant near its critical point?

A)Increased compressor power consumption greatly
B)Fractionation leads to composition shift
C)Expansion valve blockages from crystal formation
D)Oil viscosity diminishes rapidly

💡 Explanation

Fractionation risk increases because zeotropic refrigerants undergo phase separation, changing composition upon leakage; therefore performance degrades, rather than other failures, because of shifted vapor pressures at this composition.

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