Analysis and optimization with ecological objective function of irreversible single resonance energy selective electron heat engines

Abstract

a b s t r a c tEcological performance of a single resonance ESE heat engine with heat leakage is conducted by applying finite time thermodynamics. By introducing Nielsen function and numerical calculations, expressions about power output, efficiency, entropy generation rate and ecological objective function are derived; relationships between ecological objective function and power output, between ecological objective function and efficiency as well as between power output and efficiency are demonstrated; influences of system parameters of heat leakage, boundary energy and resonance width on the optimal performances are investigated in detail; a specific range of boundary energy is given as a compromise to make ESE heat engine system work at optimal operation regions. Comparing performance characteristics with different optimization objective functions, the significance of selecting ecological objective function as the design objective is clarified specifically: when changing the design objective from maximum power output into maximum ecological objective function, the improvement of efficiency is 4.56%, while the power output drop is only 2.68%; when changing the design objective from maximum efficiency to maximum ecological objective function, the improvement of power output is 229.13%, and the efficiency drop is only 13.53%.

Feynman’s Ratchet and Pawl with Ecological Criterion: Optimal Performance versus Estimation with Prior Information

“…In Section 2, we describe the model of Feynman's ratchet as heat engine and discuss its optimal performance with ecological criterion [49][50][51][52]. In Section 2.1, two-parameter optimization of the ratchet is carried out.…”

Thermal optimization of Curzon-Ahlborn heat engines operating under some generalized efficient power regimes

“…In particular, the graphs a) and b) of Fig. 5 make evident the experimental fact that occurs in the mesoscopic energy converters, which operate within very small temperature gradients (T c ≈ T h ) and therefore, their efficiencies are low [28,29,30]. This is because the system become saturated and the energy conversion processes stop.…”

Performance and Ecological Objective Investigation of Two-State Irreversible Quantum Heat Engine

“…Besides basic thermodynamics including power output and efficiency, ecological function presented by Angulo-Brown and improved by Yan, is investigated too [28,29]. Ecological function is very useful method to optimize thermal cycles, because, it provides maximum power output and exergy destruction difference and some recent applications of the ecological function can be found in [30][31][32]. All parameter is obtained as dimensionless, results are presented and recommendations have been made.…”