What is it about?

This research aims to improve the efficiency of diesel engines by reducing heat loss from the exhaust system. This is done using passive strategies, which means no additional energy is required. The researchers have developed a computational model of a direct injection engine and conducted simulations to study the effects of different insulation strategies on exhaust temperature and fuel consumption. Their results show that combining turbine and exhaust port insulation can lead to significant improvements in fuel economy, thus reducing GHG emissions and exhaust temperature, whose increase leads to an earlier aftertreatment system light-off and higher conversion efficiency for pollutant removal.

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Why is it important?

Regarding the originality and innovation of this publication, it presents a study that contemplates realistic and feasible solutions for the insulation of exhaust line elements according to the state-of-the-art technology, while confronting them with the theoretical limits to establish an analysis of the future potential. Additionally, methodologically, it provides clear guidelines on how to implement and evaluate this type of solution computationally in gas dynamics models applicable to reciprocating internal combustion engines and complex components, such as turbochargers, quantifying the expected impact in terms of integration into the propulsion plant, that is, considering the direct effects, of a thermal nature, and the indirect effects, on the specific fuel consumption of the engine due to the alteration that occurs in the thermodynamic cycle. In this way, the discussion leads to the proposal of solutions with the potential to be implemented by manufacturers in products that reach society. Overall, this publication is a significant contribution to the field of passive thermal management with emission control purposes providing a comprehensive analysis of the potential of thermal insulation, as well as clear guidelines for its implementation.

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This page is a summary of: Turbine and exhaust ports thermal insulation impact on the engine efficiency and aftertreatment inlet temperature, Applied Energy, April 2019, Elsevier,
DOI: 10.1016/j.apenergy.2019.02.043.
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