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6 D.Maksiuta, L.Moroz, M.Burlaka, Y.Govorushenko / Energy Procedia 00 (2017) 000–000 difficult to implement. To enlarge the blade chord turbine diameter can be increased, however, this will reduce the efficiency. Based on these considerations, it was decided that HPT would have a five-staged design (preliminary design of five-staged HPT have shown that all blade chords are larger than 4 mm). Maximum of LPT efficiency was achieved when turbine had 9 stages. Moreover, it was observed that in this case the rotor rotational speed is close to 3000 rpm. Therefore, for LPT detailed designing shaft rotational speed was fixed at 3000 rpm. After the above-mentioned steps have taken place, detailed design of HPT and LPT was performed. For detailed designing, AxSTREAM's preliminary design tool was also used. Turbines with a higher efficiency than in preliminary feasibility study were obtained due to increasing the number of calculation points and narrowing the ranges of parameter variation. Meridional view of the designed turbines are shown in Fig. 5. HPT a LPT bc Fig. 5 HPT and LPT meridional view comparison It should be noted that turbines on Fig. 5 (b) are presented in one space using equal scale. Figures 5 (a) and (c) shows closed-up meridional view of HPT and LPT using different scale. Real dimensions can be seen on the vertical and horizontal rulers on the left and the bottom sides of the pictures, respectively. The obtained turbines have high performance indexes. The HTP gives 266.5 kW of mechanical power with efficiency of 0.8953; the LPT provides 406.5 kW of mechanical power with efficiency of 0.9249. It should be noted that replacement of turbines proposed in paper [3] with designed radial-outflow turbines would increase generated mechanical power of the ORC by 11.06%. Wherein, thermal efficiency of the cycle calculated as a relation between Net Power Production and Transferred Heat is equal to 0.1907. All performance data and crucial dimensions are collected in Tables 2, 3. 3.2. Comparison of different turbine types After the preliminary design phase, two radial-outflow turbines with high performance indexes were obtained. However, it is interesting to compare designed ROT with radial-inflow turbine (RIT) and axial one, which are more common nowadays.PDF Image | radial-outflow turbine type for 3 MW WHR organic Rankine cycle
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