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28 The screw expander would then develop a gross shaft output of 24 kW. The results also showed that the total increase in power output was 8.5%. In 2014, Yang et al. [37] conducted an experimental study to investigate the performance of ORC and the screw expander under various diesel engine operating conditions. They used R245fa as the working fluid and the exhaust gas of a six-cylinder diesel engine as the heat source. The performance of the expander was investigated at different values of expander inlet pressure and rotational speed. Their results showed that the power output and isentropic efficiency of the screw expander increase with the inlet pressure and rotational speed. The expansion ratio of the expander was shown to decrease with the increasing inlet pressure and rotational speed of the expander. Recently, Wu et al. [136] conducted an experimental test to study the influence of different engine loads and expander torques on the performance of ORC systems. They used the exhaust gas of a diesel engine and R123 as the heat source and cycle working fluid, respectively. Their results showed that the power output of the single-screw expander increased in the form of a parabola with the rising expander torque. In terms of ORC efficiency, the results showed that efficiency increases with the expander torque, with a maximum value of 6.48% at approximately64 N.m. For the single-screw expander, themaximum power output of 10.38kW and a shaft efficiency of 57.88% were achieved at 1538rpm.The maximum improvement of the diesel engine with ORC over that of the diesel engine without ORC was 1.53% at 250kW. c) Piston Expanders In 1984, Poulin et al. [137] simulated an ORC system using several adiabatic diesel configurations. The results of their study showed that the maximum recoverable power was achieved by the turbocharged non-after- cooled diesel engine with a maximum BSFC improvement of 16.2%. They also stated that the expander efficiency improved with the fluid temperaturePDF Image | Automotive Radial Turbine Expander Design WHR
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