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ISAIME 2019 IOP Publishing IOP Conf. Series: Materials Science and Engineering 694 (2019) 012014 doi:10.1088/1757-899X/694/1/012014 Figure 8 is the direction of flow for each fluid which reaches the highest power and efficiency. It can be seen, there is a secondary flow for each fluid when going through the stator or guide vane. Secondary flow is the losses that often occur in turbines with a percentage of losses of around 30% after leakage losses and friction losses [13]. In this research leak and friction losses are ignored, so secondary flow is the only losses that occurs. 4. Conclussion The conclusion of this study, there are different results between calculations using the cycle tempo for each working fluid (Pentane, Butane, R254fa) which produces 5 kW of power with CFD simulation results, where Pentane working fluid produces power around 3.71 kW at 12000 rpm, butane produces power around 5.95 kW at 6000 rpm and R245fa produces power around 4.8 kW at 4000 rpm. Whereas Butane obtained the most efficient working fluid at rotational speed, Butane which produces power of 8.24 kW and 53.5% efficiency at 14000 rpm. References [1] BPPT.2016. Indonesia Energi Outlook 2016 [2] Irianto, Dani.2016. Thermodynamic Modeling and Simulation of Geothermal Hybrid Flash- Binary Power Plants From the Point of view of Non-Condensable Gas Effect, Master theses, Institut Teknologi Bandung : Bandung. [3] Jouhara, Hussam et al. 2018. Waste Heat Recovery Technologies and Applications, Elsevier : london, pp. 268-289. [4] https://orc-world-map.org/biomass-geothermal/, accessed on February 2019 [5] Li, Peng et al. 2018. Analysis of the Effect of Blade Installation Angle and Blade Number on Radial Inflow Turbine Stator Flow Performance, Energies MDPI : china. [6] Brun, Klau et al. 2012. Analysis of Solid Particle Surface Impact Behavior in Turbomachinery to Assess Blade Erosion and Fouling, Proceeding of Forty First Turbomachinery Simposium : Texas. [7] Wei, D, et al. 2007. Performance analysis and optimization of organic Rankine cycle (ORC) for waste heat recovery, Energy Conversion and Management, 48(4), pp. 1113–1119. [8] He, C.,et al. 2012. The optimal evaporation temperature and working fluids for subcritical organic Rankine cycle, Energy, 38(1), 136–143. [9] https://infinityturbine.com/rot06/ , accessed on July 2019 [10] ANSYS, Inc. 2013. ANSYS CFX-Solver Theory Guide, 15317, pp.724–746. [11] Qodri, F.2013. Determination Of optimum Temperature And Pressure At Turbine Inlet For Organic Rankine Cycle Based On Brine Temperature And Critical State Of Working Fluid, Master theses, Institut Teknologi Bandung : Bandung. [12] [Macchi, E. 2016. Organic Rankine Cycle (ORC) Power Systems Technologies and Applications, London: Elsevier Inc. [13] Cui, J., Rao, V. N., Tucker, P. G. 2017. Numerical investigation of secondary flows in a high- lift low pressure turbine, International Journal of Heat and Fluid Flow, 63, pp 149–157, 8PDF Image | Turboexpander on Organic Rankine Cycle with Working Fluids
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