Energy and exergy analysis of a novel turbo-compounding system for supercharging and mild hybridization of a gasoline en
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Energy and exergy analysis of a novel turbo‑compounding system for supercharging and mild hybridization of a gasoline engine Farhad Salek1 · Meisam Babaie2 · Ali Ghodsi1 · Seyed Vahid Hosseini1 · Ali Zare3 Received: 27 May 2020 / Accepted: 7 August 2020 © The Author(s) 2020
Abstract Number of hybrid vehicles has increased around the world significantly. Automotive industry is utilizing the hybridization of the powertrain system to achieve better fuel economic and emissions reduction. One of the options recently considered in research for hybridization and downsizing of vehicles is to employ waste heat recovery systems. In this paper, the addition of a turbo-compound system with an air Brayton cycle (ABC) to a naturally aspirated engine was studied in AVL BOOST software. In addition, a supercharger was modeled to charge extra air into the engine and ABC. The engine was first validated against the experimental data prior to turbo-compounding. The energy and exergy analysis was performed to understand the effects of the proposed design at engine rated speed. Results showed that between 16 and 18% increase in engine mechanical power can be achieved by adding turbo-compressor. Furthermore, the recommended ABC system can recover up to 1.1 kW extra electrical power from the engine exhaust energy. The energy and exergy efficiencies were both improved slightly by turbo-compounding and BSFC reduced by nearly 1% with the proposed system. Furthermore, installing the proposed system resulted in increase in backpressure up to approximately 23.8 kPa. Keywords Air Brayton cycle · Waste heat recovery · Hybridization · Supercharger · Turbo-compounding · Exergy · Downsizing List of symbols ABC Air Brayton cycle a Vibe parameter BDUR Burn duration (deg) Ė Exergy rate (kW) e Specific exergy (kJ kg−1) I Exergy destruction (kW) m Vibe shape ṁ Mass flow rate (kg s−1) ORC Organic Rankine cycle Q̇ Heat transfer rate (kW) SOC Start of combustion (deg) TC Turbo compressor * Meisam Babaie [email protected] 1
Faculty of Mechanical and Mechatronic Engineering, Shahrood University of Technology, Shahrood, Iran
2
School of Science, Engineering and Environment, University of Salford, Manchester, UK
3
Flow, Aerosols and Thermal Energy (FATE) Group, School of Engineering, Deakin University, Melbourne, VIC 3216, Australia
WHR Waste heat recovery Ẇ Mechanical power (kW) ∝ Crank shaft angle (deg) Subscripts C Coolant ch Chemical f Fuel HEX Heat exchanger ht Heat transfer ph Physical
Introduction Air pollution is one of the major challenges that many countries are envisaged today. Transportation sector among the sources of emissions is responsible for about 40% CO2 emission around the world [1]. Apart from C O2, other harmful emissions such as particulate matters, CO, HC and NOx are emitted from the vehicle tailpipes running by fossil fuels. Even in recent COVID-19 pandemic, a direct relationship between the number of death and air pollution was observed [2]. Governments around the word have started to re
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