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CHAPTER 5: Mean-line Modelling and Optimization of Organic RIT and Integration with Cycle Analysis Programme and 5.8.1 were used to maximize Ξ·stage,ts (OF2). Then to correlate the variation of the optimized Ξ·stage,ts with non-dimensional parameters following specifications for the main turbine and cycle design parameters were set to cover a wide range of designs. π β (323: π : 10) π‘,1 π’ππππ π β (0.8: 1.5: 0.1) π β (0.15: 0.5: 0.05) Equation 5-32 Equation 5-33 Equation 5-34 Where the first and second terms are the lower and upper boundaries and third term is the step of variation for each parameter. Tupper was selected to be close to the critical temperature of each working fluid. Every possible combination of the above three parameters were created for all the fluids in Table 5-1 and the ORC-RIT model were used to optimize the rest of inputs using GA for maximum Ξ·stage,ts. The results were 1797 optimized cases that were used in the linear regression analysis to obtain the correlations. Prior of obtaining the correlations, to include the effect of compressibility factor into the Ξ·stage,ts correlation, another non-dimensional parameter called volumetric expansion ratio (VR) introduced by (Macchi et al. 1981) was also included in the model (as an output) to address the effect Mach number. VR explicitly correlates the degradation of turbine efficiency due to the high Mach numbers (Macchi et al. 1981). In other words, VR accounts for the compressibility effect in a more generalized way than Mach number and is defined as following: ππ = π5 Equation 5-35 π1 Its value can be estimated from the cycle operating conditions (based on the desired requirements) and without the need for completing the turbine design procedure. 207 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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