Adding non-adiabatic, power-law dissipative friction in the adiabatic branches of a Carnot-like engine leaves the universal minimum and maximum efficiency-at-maximum-power bounds unchanged.
Experimental validation of the $1/\tau$ -scaling entropy generation in finite-time thermodynamics with dry air
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abstract
The second law of thermodynamics can be described as the non-decreasing of the entropy in the irreversible thermodynamic process. Such phenomenon can be quantitatively evaluated with the irreversible entropy generation (IEG), which was recently found to follow a $1/\tau$ scaling for the system under a long contact time $\tau$ with the thermal bath. This scaling, predicted in many finite-time thermodynamic models, is of great potential in the optimization of heat engines, yet remains lack of direct experimental validation. In this letter, we design an experimental apparatus to test such scaling by compressing dry air in a temperature-controlled water bath. More importantly, we quantitatively verify the optimized control protocol to reduce the IEG. Such optimization shall bring new insight to the practical design of heat engine cycles.
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Efficiency at the maximum power of the power law dissipative Carnot-like Heat engines with non-adiabatic dissipation
Adding non-adiabatic, power-law dissipative friction in the adiabatic branches of a Carnot-like engine leaves the universal minimum and maximum efficiency-at-maximum-power bounds unchanged.