Which limit governs total work obtainable when irreversible heat engine operates between two constant temperature reservoirs?

💡 Explanation

When an irreversible heat engine operate between two temperature reservoirs, exergy destruction occurs because irreversibilities generate entropy, reducing the system's potential to do work. Therefore exergy destruction governs the obtainable work, rather than Carnot efficiency or power output alone because these apply ideally without any irreversibilities.

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