Which effect predominates when a Stirling engine operates near its intended minimum temperature?

💡 Explanation

When the Stirling engine operates near its minimum designed temperature, the temperature difference between hot and cold ends decreases, leading to lower heat transfer. This intensifies regenerator thermal losses because imperfect heat exchange dominates, reducing overall efficiency. Therefore, regenerator losses predominate, rather than volume, friction, or conduction effects, because heat transfer becomes limiting.

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