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Automotive Radial Turbine Expander Design WHR

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Automotive Radial Turbine Expander Design WHR ( automotive-radial-turbine-expander-design-whr )

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30 loads. Overall, the authors stated that an axial piston expander with non- lubricated hot parts would fit perfectly with a mobile application becauseofits ability to deal with droplets in transient conditions. Recently, Chiong et al. [141] presented a new nozzle steam piston expanderto recover the exhaust energy of a Cummins 6BT turbocharged direct injection diesel engine. Their results demonstrated that the power output of the nozzle piston expander was 3.53 KW higher than the conventional one when operating at 1500 rpm. Moreover, the improvement of the BSFC was 3% higher in the nozzle piston expander. Galindo et al. [142] conducted a simulation and an experimental test to study the performance of an ORC system when used as a WHR in ICEs. Swash-plate piston expander was used as the expansion machine and ethanol as the working fluid in the ORC system. The performance of the expander was studied at different speeds with a maximum efficiency of 58.8% and a power output of 2kW at 2500 rpm. d) Rotary Vane Expanders In 2009, Teng and Regner [31]analysed the fuel-saving benefit for a class-8 truck diesel engine equipped with an ORC system using the EGR as the heat source. The authors stated that becausethe expansion ratio in a supercritical cycle is extremelylarge for a single-stage turbine, the turbine is replaced with a positive displacement rotary expander with an expansion ratio of 6.4 for the subcritical cycle and 33 for the supercritical one. The results of their analysis showed that a fuel saving of up to 5% could be realisedand further improvementcould be achieved if charge air cooling is integrated in the Rankine cycle loop. The following year, Tahir et al. [143]conducted an experimental study to investigate the performance of ORC systems when used as a WHR system to recover wasted heat from low-temperature heat sources. The authors selected a rotaryvanetype as the expansion machine and R245fa as the working fluid. Their results showed that the highest measured efficiency

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