Working Fluid Design for Organic Rankine Cycle

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Working Fluid Design for Organic Rankine Cycle ( working-fluid-design-organic-rankine-cycle )

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26 Model and infeasible [39]. A low degree of reaction reduces the pressure drop in the rotor and limits sealing problems in addition to achieving expansion in a single stage[17, 44]. Hence, a reaction of about 0.15 has been chosen in this work. A well designed nozzle, in general, has a high isentropic efficiency and hence a value of 95% has been considered. The blades are assumed to be radial at the inlet to reduce bending stresses [17]. The parameters associated with the inlet velocity triangle have to be calculated as it is important to compute the Mach number which is required for the preceding nozzle design. Although the inlet Mach numbers can be in excess of the minimum, it is essential to limit its value as higher values lead to increased stator losses, higher velocities in the rotor and increased incidence losses. (a) Velocity Triangle (b) Rotor Inlet Flow Figure 3-8: Rotor inlet flow and velocity triangle (from Whitfield and Baines [1]) Figure 3-9: Velocity triangles at rotor exit hub and shroud (from Whitfield and Baines [1]) For the rotor exducer, a similar analysis is applied. The exit of the rotor is assumed to have no swirl velocity. The exit velocity can be determined by using the exit velocity ratio φ. The rotor exit geometry is determined by the exit hub to shroud diameter ratio D3h/D3s and the diameter ratio D2/D3rms. Rohlik [45] suggested that the exit hub to shroud diameter Akshay Hattiangadi Master of Science Thesis

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