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Effects of Pitch Length of Stack-type EGR Cooler on Heat Exchange Characteristics in a Diesel Engine  

Hwang, Se-Joon (Graduate School of Mechanical Engineering, Inje University)
Kim, Min-Chol (Graduate School of Mechanical Engineering, Inje University)
Jang, Sang-Hoon (Graduate School of Mechanical Engineering, Inje University)
Kim, Hyung-Man (School of Mechanical & Automotive Engineering & High Safety Vehicle Core Technology Research Center, Inje University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.18, no.2, 2010 , pp. 135-140 More about this Journal
Abstract
An important goal in diesel engine research is the development of a means to reduce the emissions of nitrogen oxides (NOX). The use of a cooled exhaust gas recirculation (EGR) system is one of the most effective techniques currently available for reducing nitrogen oxides. Since Particular Matter (PM) fouling reduces the efficiency of an EGR cooler, a trade-off exists between the amount of NOX and PM emissions, especially at high engine loads. In the present study, engine dynamometer experiments have been performed to investigate the heat exchange characteristics of the stack-type EGR coolers with wave fin pitches of 3.6 and 4.6 mm. The results show that the heat exchange effectiveness is decreased as surface area decrease with pitch of 4.6 mm due to PM fouling. As surface area increase at pitch of 3.6 mm, super-cooling happens in the recirculated exhaust gas.
Keywords
Diesel engine; EGR cooler; Wave fin; Heat exchange Effectiveness; PM;
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