Performance Optimization of an Air-Standard Irreversible Dual-Atkinson Cycle Engine Based on the Ecological Coefficient of Performance Criterion

Abstract

This paper presents an ecological performance analysis and optimization for an air-standard irreversible Dual-Atkinson cycle (DAC) based on the ecological coefficient of performance (ECOP) criterion which includes internal irreversibilities, heat leak, and finite-rate of heat transfer. A comprehensive numerical analysis has been realized so as to investigate the global and optimal performances of the cycle. The results obtained based on the ECOP criterion are compared with a different ecological function which is named as the ecologic objective-function and with the maximum power output conditions. The results have been attained introducing the compression ratio, cut-off ratio, pressure ratio, Atkinson cycle ratio, source temperature ratio, and internal irreversibility parameter. The change of cycle performance with respect to these parameters is investigated and graphically presented.

Progress in Finite Time Thermodynamic Studies for Internal Combustion Engine Cycles

“…The main OPBs used in ICE cycles analysis and optimization include power (work) and efficiency [74][75][76], power density [77], effective power [78], EF [79][80][81][82][83][84], ecological coefficient of performance (ECOP) [85] and so on. (2)…”

“…Considering HTL, FL and IIL and fixing the cycle maximum temperature, Ge [84] adopted the VSH model advanced in [85][86][87][88], investigated the optimum power output and efficiency performance characteristics, as well as the optimum EF performance of an irreversible Brayton cycle, and examined the influences of the three losses on cycle performance.…”

“…Considering HTL and IIL, Ust et al [216] optimized the performance of an irreversible Dual cycle based on MP, ME and MEP performance criteria and investigated the influences of CR, pressure ratio and the two losses on cycle performance. Based on ECOP, Gonca and Sahin [85] optimized the performance of an irreversible Dual-Atkinson cycle with HTL and IIL and investigated the influences of the two losses, CR, cut-off ratio and pressure ratio on cycle performance. Zi et al [101] used an empirical equation of mean mechanical loss pressure to compute the mechanical loss which included the losses related to construction of combustion chamber and rotating part loss of crankshaft connecting rod, and investigated the influence of mechanical loss on the power output and efficiency performance characteristics of an irreversible Dual cycle.…”

“…Considering HTL, FL and IIL and fixing the cycle maximum temperature, Ge et al [84,224] adopted the VSH model advanced in [85][86][87][88], and investigated the optimum power and efficiency performance [84,224], as well as the optimum EF performance [84] of an irreversible Dual cycle, and examined the influences of the three losses on cycle optimum performance. Ebrahimi et al [225] adopted the VSH model in [224] and investigated the influence of mean piston motion velocity on the power output and efficiency performance characteristics of an irreversible Dual cycle.…”

Performance Analysis of an Atkinson Cycle Engine under Effective Power and Effective Power Density Conditions

“…Capaldi [31] designed a novel Atkinson-Miller cycle engine for a micro cogeneration plant to increase thermal efficiency of the plant and to abate the pollutant emissions released from the plant. Gonca and Sahin [32] carried out a thermo-ecological performance optimization for a dual AC engine. Gonca [33,34] performed a couple of investigation studies on the dual AC engine considering friction, heat transfer and temperature-dependent specific heats based on classical thermodynamics and FTT methods.…”