Analysis of energy utilization and thermal efficiency in diesel engines under varying EGR rates

Zhiqiang Han, Buwei Deng, Xueshun Wu, Wei Tian, Jia Fang, Yi Wu, Yan Yan and Zinong Zuo

Energy, 2025, vol. 319, issue C

Abstract: The exhaust gas recirculation (EGR) rate significantly impacts the thermal efficiencies of diesel engines. It is important to propose a reasonably indicated thermal efficiency optimization method to clarify the core parameters influencing the EGR rate on the indicated thermal efficiency and describe the energy utilization process. This study was conducted on a diesel engine equipped with an EGR system and an adjustable two-stage turbocharging system, and the core parameters of the EGR rate affecting the indicated thermal efficiency and its intermediate process were characterized. The results showed that the changes in the percentage composition of the in-cylinder energy output are different in the EGR rate range of 0%–18 % and 18%–51 %. The variations in the percentage composition of in-cylinder energy output accounted for 36.20 %, and the changes in total input energy contributed to 63.80 % of the increase in indicated work. The proportion of intake enthalpy remains at approximately 23 %. Both the variation in total input energy and the changes in the percentage composition of in-cylinder energy output are significantly influenced by intake enthalpy. Therefore, it is considered that the key parameters affecting indicated thermal efficiency are the intake enthalpy and total input energy, which belong to the category of energy values.

Keywords: Exhaust gas recirculation (EGR); Energy analysis; Thermal efficiency; Diesel engine (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:319:y:2025:i:c:s0360544225006711

DOI: 10.1016/j.energy.2025.135029

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