Because of thermal efficiency of combustion cycles? Turbines are only like 30% to 40% efficient largely because of thermodynamics.
this post was submitted on 01 Jul 2024
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In large power plants, e.g. block D of natural gas power plant Emsland, you can get almost 60 %, but that's neither the standard for power plants, which was like ~28 % in Germany a few years ago, nor is the technology applicable for small scale devices as e.g. car engines.