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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 Numerical Simulation of Turboexpander on Organic Rankine Cycle with Different Working Fluids Diki Ismail Permana1 and Priyono Sutikno2 1 Faculty of Industrial Engineering, Institut Teknologi Nasional, Bandung, Indonesia 2 Faculty of Mechanical Engineering and Aerospace, Institut Teknologi Bandung, Bandung, Indonesia E-mail: dicky91permana@itenas.ac.id Abstract. Renewable energy is an alternative to overcome the energy crisis and dependence on fossil-fuel energy that has an environmental impact due to the greenhouse effect. Meanwhile, disadvantage of EBT is depend on weather periodically. Geothermal is a source of EBT that is independent with weather. Geothermal resources dominated by water (brine) can’t be directly utilized as a power generated, but it has to separated into water and steam phase. The high enthalpy owned by brine can still be utilized due to development of Organic Rankine Cycle. ORC uses organic refrigerant fluids or hydrocarbons as a working fluid because it has low boiling temperatures. The numerical simulation was analyzed using a CFD ANSYS CFX with turbulence model K-epsilon and Pentane, R245fa, and butane as a working fluids with expansion ratio 5:1 and rotational speed variation at 2000 until 14000 rpm. 1. Introduction Indonesia is a country that has the greatest geothermal potential in the world around 27 GW. But in application, it only about 1.2 GW and it is divided into 7 regions [1]. One of the areas that has the greatest potential and has been utilized is the Awibengkok area, West Java. Where, the installed plant is around 127 MWe with a reservoir temperature of 250o-290oC and reservoir pressure of 35-85 bar and brine temperature of 160o-180oC and brine pressure of 11 bar [2]. Can be seen the brine temperature needed, then the area of Awibengkok can be utilized as a combined heat generator. One of the combined heat plants is the application of the Organic Rankine Cycle (ORC) which uses organic fluids or hydrocarbons as a working fluids because it has a low boiling temperature point. At present more than 200 ORC plants have been identified with more than 1800 MW installed worldwide [3]. Factors that causing ORC technology are still not utilized, because the components production is still very lack, especially turboexpander component that require very high costs to be developed and produced [4]. Turboexpander is a substantial component in ORC, where the energy of organic fluid flows into turbine shaft then the mechanical energi from rotating shaft is converted, which moves to the generator to produce electricity. Generally, there are two common turboexpanders, in terms of the direction of fluid passing through the turbine, axial turbine and radial turbine. In this research, the turboexpander type is radial turbine outflow or centrifugal radial turbine is used. One way to develop ORC technology is to analyze ORC turboexpander. Simulation is a way to get optimal efficiency and is expected to produce maximum power as well. The expander simulation process with the flow that occurs in the turboexpander is done by the CFD method. Spadicini, et al Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd 1PDF Image | Turboexpander on Organic Rankine Cycle with Working Fluids
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