Modeling of engine warm-up with the use of an exhaust gas recuperator at low ambient temperatures

• Published in: Transportation research procedia (Online) 2021, Vol.57, p.547-552
• Main Authors: Rakov, Vyacheslav, Pikalev, Oleg, Bogomolov, Andrey, Dymov, Nikolay
• Format: Article
• Language: English
• Subjects: cold climate; engine warm-up; exhaust gases; heat exchanger; heater; modeling; recuperation
• ISSN: 2352-1465; 2352-1465
• DOI: 10.1016/j.trpro.2021.09.083

The paper describes the modeling of the cooling system of an internal combustion engine with an installed exhaust gas recuperator. During operation at low temperatures, the heat of the burnt fuel is not sufficient for the simultaneous warm-up of the engine and the cab. In the course of the study, changes in the temperature of exhaust gases after engine ignition were analyzed. The paper presents the calculations of the heat capacity of exhaust gases at the warm-up stage. As we established, up to 1.5 kW of heat energy at the engine’s idle running can be derived from exhaust gases. Based on the data on engine warm-up and exhaust gas heat capacity after ignition, we developed a mathematical warm-up model. Its output parameter is the time required by the engine to reach the set temperature. With the studies applying this model, it became possible to establish the effectiveness of using a liquid-gas heat exchanger and model the operation of the entire cooling system. We obtained engine warm-up vs. time diagrams with the cab heater enabled in different modes. A controlled liquid-gas heat exchanger embedded into the ICE cooling system was used as the exhaust gas recuperator in the calculations.