Which outcome occurs as refrigerant R-134a nears its critical temperature inside a heat pump compressor?

💡 Explanation

When R-134a approaches its critical temperature, its heat capacity decreases significantly because the distinction between liquid and vapor phases diminishes, leading to less efficient heat removal and compressor overheating. Therefore overheating results, rather than valve failure, decreased efficiency due to phase change, or increased lubrication which involves different thermal properties and failure modes.

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