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Session: Poster session and Ouzo tasting in room Kallirhoe
Session starts: Monday 09 September, 17:20

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Łukasz Witanowski (Institute of Fluid-Flow Machinery Polish Academy of Sciences)
Piotr Klonowicz (Institute of Fluid-Flow Machinery Polish Academy of Sciences)
Piotr Lampart (Institute of Fluid-Flow Machinery Polish Academy of Sciences)

Abstract:
The optimisation of power systems enables their efficiency to be increased, with a consequent increase in the mechanical and electric power generated by the components. For ORC systems, in which cycle efficiency is relatively low (up to 30%)[1–4], designing a high efficiency system increases the competitiveness of the entire undertaking. In this article, a single-criterion rotor geometry optimisation method is presented for a 10 kWe axial micro-turbine operating in an ORC system. Calculations were performed using deterministic, stochastic and hybrid algorithms. Isentropic efficiency was defined as the objective function. Single channel calculations were performed using a Matlab application and commercial simulation code. This paper presents a rotor blade, hub and shroud shapes parametrisation method. The quantitative and qualitative results are listed for the optimisation algorithms used. Micro-turbine characteristic measurements were determined. A micro-turbine operation analysis was conducted under off-design conditions, before and after optimisation. As a result of the optimisation process, micro-turbine efficiency was increased and the types of losses showing the most impact on geometric improvement were identified. [1] Turboden S.p.A., www.turboden.com. [2] B.F. Tchanche, G. Lambrinos, A. Frangoudakis, G. Papadakis, Low-grade heat conversion into power using organic Rankine cycles – A review of various applications, Renew. Sustain. Energy Rev. 15 (2011) 3963–3979. doi:10.1016/j.rser.2011.07.024. [3] S. Quoilin, M. Van Den Broek, S. Declaye, P. Dewallef, V. Lemort, Techno-economic survey of Organic Rankine Cycle (ORC) systems, Renew. Sustain. Energy Rev. 22 (2013) 168–186. doi:10.1016/j.rser.2013.01.028. [4] T.Z. Kaczmarczyk, G. Żywica, E. Ihnatowicz, The impact of changes in the geometry of a radial microturbine stage on the efficiency of the micro CHP plant based on ORC, Energy. 137 (2017) 530–543. doi:10.1016/j.energy.2017.05.166.