Thermodynamic and exergoeconomic analysis of waste energy recovery of a diesel engine using a dual organic Rankine cycle

Noroozi, Mohammad Javad; Emamifar, Armin; Mokhtari, Issa

doi:10.22034/jrenew.2024.200018

Thermodynamic and exergoeconomic analysis of waste energy recovery of a diesel engine using a dual organic Rankine cycle

Document Type : Original Article

Authors

Mohammad Javad Noroozi ¹

Armin Emamifar ¹

Issa Mokhtari ²

¹ Assist. Prof., Energy and Environment Research Group, Ayatollah Boroujerdi University, Boroujerd, Iran

² BSc of Mech. Eng., Ayatollah Boroujerdi University, Boroujerd, Iran

https://doi.org/10.22034/jrenew.2024.200018

Abstract

In the present research, the thermodynamic and exergoeconomic analysis of using the waste heat of a diesel engine to produce power has been investigated. In the dual cycle used, the high temperature cycle uses the energy of the exhaust gases and the low temperature cycle uses R245fa and R134a as the working fluid, respectively, in order to recover the waste heat of the intake air and engine cooling fluid. Energy analysis shows that the net power values of low temperature cycle, high temperature cycle and net power of the cycle are equal to 11.45 kW, 6.98 kW and 16.65 kW, respectively. Also, the energy and exergy efficiency of the cycle are obtained as 17.36% and 28.29%, respectively. The results of the economic analysis show that the evaporator and turbine of the high-temperature cycle have the highest overall cost compared to other cycle components and it is necessary to pay more attention than other system components. In addition, the overall exergy-economic factor of the cycle is equal to 32.52%. Therefore, 67.48% of the total costs of the cycle are due to exergy destruction, and the high temperature cycle evaporator has a significant contribution to these costs.

Keywords

Exergoeconomic analysis

Energy recovery

Organic Rankine Cycle

Diesel engine

Power

Subjects

Renewable and New Energy

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