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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 3. CFD Results 3.1 Simulation Results The simulation results from CFD of Turboexpander, give different results when compared with the data of specifications. The operating parameters being compared are turboexpander rotation from 2000 to 14000 rpm with three working fluids of R245fa, Butane and Pentane respectively. π1 =432,29; π2 =1,5334; π3 =0; π4 =0; π5 =0 (a) (b) πΆπ = π1 + π2. π + π3. π2 + π4. π3 + π5. π5 (4) π (c) Figure 5. Graphic results of each working fluid : (a) RPM vs Torque, (b) RPM vs Power, (c) RPM vs Efficiency From fig 5 we can get the results of each simulation with variations of turboexpander rotating and working fluid variations. Each fluid produces the highest efficiency and power at different rpm, for Pentane produce the power around 3.71 kW and the efficiency of 44.23% at 12000 rpm, whereas for Butane produce power around 8.2 kW and the efficiency is about 32.5% at 14000 rpm, and power produced by R245fa is about of 5.7 kW and 32.25% efficiency at 8000 rpm. One of the indications is that the Butane fluid working area is wider than other fluid working areas. These results are in accordance with research from [11] which selects the some working fluids for ORC using heat sources with a potential of 1 MWth, where Butane is the most optimum working fluid in the sub-critical cycle with thermal efficiency reaching 15.5% efficiency. 3.2 Analysis of Fluids Contour The expansion process that occurs in turboexpander involves several parameters when operating. These parameters include pressure, temperature, and velocity. Simulations performed on the ANSYS CFX software provide these parameters. 5PDF Image | Turboexpander on Organic Rankine Cycle with Working Fluids
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