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Thermodynamic, Economic, and Environmental Analyses and Multi-Objective Optimization of Dual-Pressure Organic Rankine Cycle System with Dual-Stage Ejector
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Thermodynamic, Economic, and Environmental Analyses and Multi-Objective Optimization of Dual-Pressure Organic Rankine Cycle System with Dual-Stage Ejector
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Thermodynamic, Economic, and Environmental Analyses and Multi-Objective Optimization of Dual-Pressure Organic Rankine Cycle System with Dual-Stage Ejector
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Journal Article
Thermodynamic, Economic, and Environmental Analyses and Multi-Objective Optimization of Dual-Pressure Organic Rankine Cycle System with Dual-Stage Ejector
2024
Overview
A novel dual-pressure organic Rankine cycle system (DPORC) with a dual-stage ejector (DE-DPORC) is proposed. The system incorporates a dual-stage ejector that utilizes a small amount of extraction steam from the high-pressure expander to pressurize a large quantity of exhaust gas to perform work for the low-pressure expander. This innovative approach addresses condensing pressure limitations, reduces power consumption during pressurization, minimizes heat loss, and enhances the utilization efficiency of waste heat steam. A thermodynamic model is developed with net output work, thermal efficiency, and exergy efficiency (Wnet, ηt, ηex) as evaluation criteria, an economic model is established with levelized energy cost (LEC) as evaluation index, an environmental model is created with annual equivalent carbon dioxide emission reduction (AER) as evaluation parameter. A comprehensive analysis is conducted on the impact of heat source temperature (TS,in), evaporation temperature(T2), entrainment ratio (Er1, Er2), and working fluid pressure (P5, P6) on system performance. It compares the comprehensive performance of the DE-DPORC system with that of the DPORC system at TS,in of 433.15 K and T2 of 378.15 K. Furthermore, multi-objective optimization using the dragonfly algorithm is performed to determine optimal working conditions for the DE-DPORC system through the TOPSIS method. The findings indicate that the DE-DPORC system exhibits a 5.34% increase in Wnet and ηex, a 58.06% increase in ηt, a 5.61% increase in AER, and a reduction of 47.67% and 13.51% in the heat dissipation of the condenser and LEC, compared to the DPORC system, highlighting the advantages of this enhanced system. The optimal operating conditions are TS,in = 426.74 K, T2 = 389.37 K, Er1 = 1.33, Er2 = 3.17, P5 = 0.39 MPa, P6 = 1.32 MPa, which offer valuable technical support for engineering applications; however, they are approaching the peak thermodynamic and environmental performance while falling short of the highest economic performance.
