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Energies 2020, 13, 2118 13 of 19 Table 6. Comparison of main results between preliminary design and CFD. Analysis method Μ πΎπΎ [kW] πΌπΌ [%] π·π·π·π· [-] π»π»π·π· [-] π΄π΄ [-] π΄π΄ [-] ππππ ππππ ππππ ππ ππππ Preliminary design CFD 399.86 400.0 85.0 1.47 1.05 0.58 0.81 85.13 1.45 1.05 0.58 0.79 Analysismethod πͺπͺ [m/s] πΌπΌ [m/s] πΎπΎ [m/s] πͺπͺ [m/s] πΌπΌ [m/s] πΎπΎ [m/s] ππππππππππππ Preliminary design 98.2 105.5 38.3 35.6 132.3 137.0 CFD Analysis method Preliminary design CFD πΆπΆ [Β°] π·π· [Β°] πΆπΆ [Β°] π·π· [Β°] ππππππππ 100.1 105.5 40.6 37.5 132.3 137.6 68.7 β21.5 0.0 β74.9 67.9 β19.2 1.9 β74.7 6. Off-Design Analysis of the Radial Outflow Turbine 6.1. Off-Design Analysis The performance of the designed radial outflow turbine was analyzed in off-design conditions. Table 7 shows the start, end, and step values in the variable change for the off-design analysis, and a total of 75 cases of off-design analysis results were obtained. The results of the off-design analysis were summarized as dimensionless variables because it is useful to express the performance of the turbine as dimensionless variables [2,32,33]. Table 7. Information on variable changes for off-design analysis. Start ππ [K] Variables Step End 01 ππΜ [kg/s] 393.0 37.31 3.06 5760 10.0 433.0 5% Β· ππΜ πππππ‘π‘ππππππ 45.60 ππ [MPa] 5%Β·ππ 3.74 3,πππππ‘π‘ππππππ 3 6.2. Total-to-Static Efficiency (πππ‘π‘π‘π‘) versus Velocity Ratio (ππ) π π ππππ 10% Β· π π πππππππππ‘π‘ππππππ 8640 Figure 11 shows the total-to-static efficiency (πππ‘π‘π‘π‘) of the turbine according to the velocity ratio (ππ). The range of velocity ratios that can expect high efficiency over 85% is 0.57β0.70. The velocity ratio of 0.7 and πππ‘π‘π‘π‘ of 85% assumed in the preliminary design were an appropriate selection. Figure 11. Total-to-static efficiency according to the velocity ratio (ππ).PDF Image | Analysis of a Radial Outflow Turbine for Organic Rankine Cycles
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