Integrated computer-aided working-fluid design and thermoeconomic ORC system optimisation

摘要: The successful commercialisation of organic Rankine cycle (ORC) systems across a range power outputs and heat-source temperatures demands step-changes in both improved thermodynamic performance reduced investment costs. former can be achieved through high-performance components optimised system architectures operating with novel working-fluids, whilst the latter requires careful component-technology selection, economies scale, learning curves proper selection materials configurations. In this context, thermoeconomic optimisation whole power-system should completed aimed at maximising profitability. This paper couples computer-aided molecular design (CAMD) working-fluid ORC models, including recuperated other alternative (e.g., partial evaporation or trilateral) cycles, assessment. developed CAMD-ORC framework integrates an advanced molecular-based group-contribution equation state, SAFT-γ Mie, description system, is capable simultaneously optimising structure, system. advantage proposed methodology that it removes subjective pre-emptive screening criteria would otherwise exist conventional studies. used to optimise hydrocarbon working-fluids for three different heat sources (150, 250 350 °C, each mcp = 4.2 kW/K). case, optimal combination architecture identified, costs are evaluated component sizing models. It observed working fluids minimise specific cost (SIC) not same as those maximise output. For SIC isobutane, 2-pentene 2-heptene, SICs 4.03, 2.22 1.84 £/W respectively.