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221 which is widely used in ORC studies, was not applicable due to the significant effects of the operating conditions on the cycle performance. By changing the MFR from 0.05 Kg/s to 0.3 Kg/s, the performance of ORC improved by 1.65%. ORC performance also substantially varied by changing the working fluids,in which R1233zde presented a cycle efficiency of 11.09% compared to that of R123with 6.77%. The second model investigated the influence of the specifically designed ORC system, in which an intermediate oil loop was implemented on the performance and fuel consumption ofthe available off-highway HDD engine. The results showed that the increase in surface area of the heat exchanger leads to higher heat recovered at the expense of higher exhaust backpressure and WHR system weight as ΔT between the fluids approached zero. Consequently, the increase in weight of the heat exchanger was illustrated as the main parameter that limits the ORC system design in vehicular applications. Results also showed that the optimum heat exchanger length was a trade-off among exhaust backpressure, required net ORC power and weight increase. A methodology for design, optimisation and performance prediction of the ORC radial-inflow turbine was developed using mean-line analysis. This methodology encompassed a DOE technique to evaluate the effect of one or more design input parameters on the turbine performance (power and efficiency), overall size and Mach number at the rotor leading edge. The results of the design point were validated using a well-known code foundin the literature [238]. These results were in good agreement with the real case, witha maximum deviation of 5.38% in the radius of the rotor tip. The optimisation algorithm was then applied to design an efficient radial turbine for the current application. Furthermore, the leading edge was manually adjusted, where the angle increased from 0𝑜 to 54𝑜 which resulted in higher turbine power and efficiency according to the Euler equation. The optimised turbine presented a total to static efficiency 𝜂𝑡𝑠 andPDF Image | Automotive Radial Turbine Expander Design WHR
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