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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 2. Temperature Limited of optimum condition From this temperature limit, it can be used to determine the optimal conditions of the three working fluids with only one pressure variation. Furthermore, determined some properties of each fluid that obtained from NIST Refprop and some equations used. Ė ð ðĄðĒððððð = ðĖ (âh). ððĄðĒððððð (1) ððð = ðĖ (âh) (2) ðĖ ( â h ) ð= (3) Ė ðððĒðð ððĒðð The table 1 is the optimum operating state from the calculation of the cycle tempo with the power parameters generated by each working fluid that is set at 5 kW with a thermal efficiency value of each working fluid less than 10%. Table 1. Optimum conditions of ORC Parameters Units Inlet Pressure Brine MPa Temperature Brine oC mĖ Kg/s Inlet Temperature turboexpander oC Outlet Temperature turboxpander oC Outlet Temperature condenser oC Inlet Pressure turboexpander MPa Outlet Pressure turboexpander MPa Output Power kW Power used by pump kW Qin kW 2.2 Modeling The turbexpander that will be simulated in this study is the type of radial outflow turbine produced by infinity turbine. Turboexpander sizes range from 12.7 cm with an output power is around 5 kW. Turboexpander from infinity turbine has the advantage, that is not a gearbox needed [9]. Because the turboexander rotation value is low. Radial outflow turbine has two main parts, namely stator and rotor. The two main components have the shape of impulse blade. Pentane R245fa Butane 1 1 1 180 180 180 0,307 0,307 155 155 155 139,8 123,8 30 30 30 132,8 0,4 0,88 1,4 0,082 0,179 5 5 5 0,28 0,22 1,13 176,69 91,97 176 0,307 0,284 3PDF Image | Turboexpander on Organic Rankine Cycle with Working Fluids
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