WORKING FLUID SELECTION AND DESIGN OF SMALL-SCALE WASTE HEAT RECOVERY SYSTEMS BASED ON ORGANIC RANKINE CYCLES

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WORKING FLUID SELECTION AND DESIGN OF SMALL-SCALE WASTE HEAT RECOVERY SYSTEMS BASED ON ORGANIC RANKINE CYCLES ( working-fluid-selection-and-design-small-scale-waste-heat-re )

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6.1 Design and flow analysis of the turbine 87 (a) (b) Figure 6.8: Pressure distribution in the stator: (a) k − ε-turbulence model and (b) k − ω SST- turbulence model. 2.5 2 1.5 1 0.5 0 −0.5 0 0.5 1 Lenght parameter, [−] 300 250 200 150 100 50 0 −0.5 0 0.5 1 Lenght parameter, [−] Speed of sound Flow velocity Mach number (a) (b) Figure 6.9: Speed of sound and flow velocity (a) and Mach number (b) in the mean line of the stator flow channel, k − ω SST-turbulence model. The flow field of the stator Geometry 5 was studied in off-design conditions by using k − ω SST-turbulence model. The area averaged results for flow field in the stator in 80 % and 60 % off-design conditions are presented in Table 6.5 and the contours of velocity magnitudes in Figure 6.10a and Figure 6.10b. The pressure and velocity at the stator outlet and the pressure ratio of the stator are lower in the off-design conditions than in the design condition. It should be noted that the pres- sure ratio over the stator and the stator outlet velocity are lower when compared to the Velocity, [m/s] Mach number, [−]

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WORKING FLUID SELECTION AND DESIGN OF SMALL-SCALE WASTE HEAT RECOVERY SYSTEMS BASED ON ORGANIC RANKINE CYCLES

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