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← ScienceWhich failure precedes a closed-cycle cryocooler's inefficiency approaching Carnot limits?
A)Refrigerant compressor piston ring leakage✓
B)Expansion valve's non-isenthalpic throttling
C)Heat exchanger thermal boundary layer growth
D)Cryostat vacuum partial pressure increase
💡 Explanation
Compressor leakage reduces effective pressure ratios, disrupting ideal Carnot cycling. Because the isentropic expansion becomes less efficient, heat removal degrades rather than cooling perfectly per Carnot limits. The cycle degrades due to non-ideal working fluid behavior; other effects worsen secondary issues.
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