Different configurations of exhaust gas heat recovery in internal combustion engine: Evaluation on different driving cycles using numerical simulations

[+] Author and Article Information
Hanna Sara

PhD, Research engineer, Ecole Centrale de Nantes, Nantes, France

David Chalet

Professor, Ecole Centrale de Nantes, Nantes, France

Mickaël Cormerais

PhD, Manager of thermal management competence center, MANN+HUMMEL France, Laval, France

1Corresponding author.

ASME doi:10.1115/1.4039304 History: Received October 27, 2017; Revised January 04, 2018


One third of the injected fuel energy in an internal combustion engine is evacuated with the exhaust gases. To answer the severe emissions regulations, automotive industries tend to improve the engine efficiency by increasing its thermal efficiency. Exhaust gas heat recovery is one of the interested thermal management strategies that aim to improve the cold start of the engine and thus reduce its fuel consumption. In this work, an overview of the heat exchanger used as well as the experimental setup and the different tests will be presented first. These tests were used to model the heat transfer between the two fluids in the exchanger as well as the pressure drops on the two sides. The exchanger model was then added to a high frequency 4-cylinder turbocharged Diesel engine model coupled with its hydraulic circuits. Numerical simulations were run to assess and valorise the exhaust gas heat recovery strategy. The application were divided into three parts: an indirect heating of the oil with the coolant as a medium fluid, a direct heating of the oil and direct heating of the oil and the coolant. The different ideas were tested over five different driving cycles: NEDC, WLTC, CADC (Urban and highway), and one in-House Developed Cycle. The simulations were performed over two ambient temperatures. Different configurations were proposed to control the engine's lubricant maximum temperature. Results concerning the temperature profiles as well as the assessment of fuel consumption were stated for each case.

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