Exhaust gas heat recuperator for the MTZ-82 tractor engine

Brief results of the study on the development of a gas-liquid heat exchange apparatus or exhaust gas heat recuperator for the D-242 diesel engine of the MTZ-82 tractor are presented. To achieve the goals and objectives of the study, an experimental setup was created, utilizing the specified engine as the power unit. A factorial experiment was conducted to study the thermal state of the engine under various operating modes, which revealed certain contradictions in the heat balance of the operating engine. Depending on the operating mode and ambient temperature, within 15 minutes of engine operation, the oil in the sump heated up to 62°C, while the coolant temperature reached a maximum value of 86°C, and the exhaust gas temperature reached 330°C. Formally, based on the coolant temperature, the engine reached the optimal operational temperature range (85–90°C). However, upon closer examination, it becomes clear that the oil had not yet reached its optimal temperature. This indicates that the temperature conditions in the friction units remained low, consequently, friction losses persisted, along with a high risk of scuffing. The developed recuperator is designed to capture a portion of the waste heat from the engine, which is dissipated into the atmosphere with the exhaust gases, for its subsequent use in the components and assemblies of the machine to maintain the specified temperature regime, including the machine's engine. Looking ahead, the recuperated heat could potentially be utilized for generating cooling and electricity to provide these resources for necessary technological operations performed by the machine-tractor unit.

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