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exergy efficiency
Exergy efficiency (also known as the second-law efficiency or rational efficiency) computes the efficiency of a process taking the second law of thermodynamics into account.
==Motivation==
From the second law of thermodynamics it can be demonstrated that no system can ever be 100% efficient. When calculating the energy efficiency of a system, the figure found gives no indication of how the system compares to a thermodynamically perfect one operating under the same conditions. In comparison, the rational efficiency of a system can reach 100% because the work output is compared to the potential of the input to do work. The energy efficiencies of a heat engine are always smaller than its exergy efficiency.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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