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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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B-2 Turbine Model 63 where vt2 and vm2 are the tangential and meridional (radial) components of the absolute velocity v2. vt2 is calculated as: C0 = 􏰴2(h01 − h3s) u2 = ψC0 vt2 = W m1u2 (B-13) (B-14) (B-15) The static and stagnation Mach numbers for absolute and relative velocities are then given by: Mx = vx ax M0x = vx a0x (B-16) B-2-3 Rotor Outlet The subroutine ROTOROUT calculates the dimensions of the turbine in addition to the enthalpies, density and speed of sound of the fluid. The enthalpy, pressure, entropy and speed of sound under total conditions is assumed to be equal to the corresponding parameters at the turbine outlet. These properties are expressed as: p3 = p4 h3s = h(p3, s2) ρ3= 1 ν(p3, h3) s3 = s4 a3 =a(p3,h3) a03 = a04 The rotor inlet diameter is calculated from the rate of mass flow as: (B-17) m = ρ3vm3A3 2 􏰭􏰮2􏰭􏰮2 (B-18) D2= 􏰯 􏰰 (B-19) m ρ3φu2π D3s 1 − D3h D2 D3s where the diameter ratios are defined as inputs as mentioned in Table 3-5. Once D2 is found, the rotor outlet diameter can be calculated through the ratios which are available. The flow is assumed to have no swirl component and hence, α3 is zero. The relative flow angle is calculated as: β3 = cos−1 􏰯 vm3 􏰰 (B-20) w3 This establishes the velocity triangle and thus the Mach number can be calculated using equation B-16. One of the most important parameter is the nozzle blade height at rotor inlet. Master of Science Thesis Akshay Hattiangadi

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