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43 Guillaume et al. [192]conducted an experimental study that intensively investigated the performance of a radial turbine with two working fluids (R245fa and R1233zd)using the exhaust of a truck engine as the heat source. However, the heat wasted by the truck through the exhaust gases was simulated using an electric oil boiler coupled to the ORC loop. R245fa showed high electrical power from the turbine-generator with a maximum value of 2.5kW, whereas R1233zd showed improvedturbine efficiency with a maximum value of 32%. Recently, IFPEN and ENOGIA [193] investigated the possibility of recovering the wasted heat in the coolant of a heavy-duty engine. They used NOVEC649 as the working fluids and a radial-inflow turbine as the expansion machine. The maximum measured cycle efficiency was 10%, and the fuel economy improvement achieved wasapproximately 2%β3%. The author[194] proposed a design methodology for a radial-inflow turbine in ORC-ICEs. The study focused on optimising the objective function, namely, isentropic efficiency, by optimising two variables: exit tip radius and inlet blade angle. As the exit tipradius increases, the tip clearance loss, mainly the radial tip clearance, decreases.Therefore,a high turbine performance is achieved. Moreover, the tangential component of the velocity decreases with the increasing exit tip radius, which results in high specific work. Increasing the inlet blade angle likewise results in high tangential velocity and,therefore,high specific work. 2.3.2.2 Performance of Turbo-Expanders The performance of turbo-expanders is expressed in terms of isentropic efficiency as shown in equation (β2-2): πππ = πππ‘π’ππ π€πππ (β2-2) πΌππππ π€πππPDF Image | Automotive Radial Turbine Expander Design WHR
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