Cycle and turbine optimisation for an ORC operating with two-phase expansion
نویسندگان
چکیده
• Novel ORC system operating with two-phase expansion and radial-inflow turbine. Single- multi-objective cycle optimisation for 150, 200 250 °C heat sources. MM MDM are optimal fluids producing up to 28% more power than single-phase ORC. Mean-line turbine completed Feasible subsonic rotor geometries obtained, candidate turbines designs proposed. Previous investigations suggest the output from waste-heat recovery organic Rankine (ORC) systems could be enhanced by 30% expansion, which reduce cost aid in widespread deployment of technology. However, there limited expander technologies suitable such operation. The aim this research is investigate a novel that operates wet-to-dry permitting use Specifically, through exploitation molecularly complex achieved across single stage, whilst region confined stator vane. Thermodynamic potential degree reaction used differentiate between processes. results reveal siloxanes fluids, heat-source temperatures ° C generate 28%, 14% 3% systems, respectively. Following this, existing mean-line methods extended under assumption homogeneous fluid thermal equilibrium, supported numerical simulations source then conducted, corresponding inlet vapour quality 0.1 0.4, lower leading efficiencies. More generally, feasible can conditions expected remain subsonic. Whilst outlet Mach numbers range 1.5 2.1, throat widths below 1 mm required, CFD indicate successfully realised within stator. In summary, these provide first positive demonstration improvement working
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ژورنال
عنوان ژورنال: Applied Thermal Engineering
سال: 2021
ISSN: ['1873-5606', '1359-4311']
DOI: https://doi.org/10.1016/j.applthermaleng.2021.116852