Gaseous fuels variation effects on first and second law analyses of a small direct injection engine for micro-CHP systems

•Three NG compositions, pure methane, and propane were operated on a small IC engine.•Denser fuel blends showed better fuel trapping ratio and efficiency.•2nd law efficiency of 53–60% of injected fuel energy was achieved depend on fuel blends.•Peak UF of 81–85.3% was assessed based on fuel quality a...

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