In order to improve the thermal performance of the dual-pressure organic Rankine cycle and to reduce the cost and environmental impact, the dual-pressure tandem organic Rankine cycle is taken as the research object. Under the condition of a 150 ℃ flue gas heat source, R245fa/R141b and R245fa/Pentane mixed working fluids are selected to study the influence of high and low- pressure evaporation temperatures on the cycle's thermal, economic, and environmental performances, and the results show that the high-pressure evaporation temperature is a key variable for the net output work, exergy efficiency, and averaged electrical energy cost of the dual-pressure organic Rankine cycle system. The low-pressure evaporation temperature is a key variable for the system’s thermal efficiency, and equivalent carbon dioxide emissions. Since the above single performance indices are not comprehensive for the performance analysis of the system, this paper innovatively proposes the multi-objective dung beetle optimization algorithm （MODBO） for the three-objective optimization of the system, and the optimization results show that the comprehensive performance of using R245fa/R141b as the working fluid is better than that of R245fa/Pentane, and the optimal operating parameters are： the mass fraction of R245fa is 0.1, the high-pressure evaporation The optimal operating parameters are： R245fa mass fraction is 0.1, high-pressure evaporation temperature is 395.96 K, low-pressure evaporation temperature is 371.63 K, and the narrow-point temperature difference is 5.00 K. At this point, the optimal solutions corresponds to the system’s thermal efficiency, averaged cost of electrical energy, and equivalent CO2 emissions are 14.97 %, 0.3362 $/kWh, and 10.778 kg CO2 eq/kWh, respectively.
Key words
organic Rankine cycle /
multi-objective optimization /
dung beetle optimization algorithm /
dual-pressure system /
waste heat recovery
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