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Journal Article

High Performance Cooling and EGR Systems as a Contribution to Meeting Future Emission Standards

2008-04-14
2008-01-1199
In relation to further tightening of the emissions legislation for on-road heavy duty Diesel engines, the future potential of cooled exhaust gas recirculation (EGR) as a result of developments in the cooling systems of such engines has been evaluated. Four basic engine concepts were investigated: an engine with SCR exhaust gas aftertreatment for control of the nitrogen oxides (NOx), an engine with cooled EGR and particulate (PM) filtration, an engine with low pressure EGR and PM filtration and an engine with two stage low temperature cooled EGR also with a particulate filter. A 10.5 litre engine was calibrated and tested under conditions representative for each concept, such that 1.7 g/kWh (1.3 g/bhp-hr) NOx could be achieved over the ESC and ETC. This corresponds to emissions 15% below the Euro 5 legislation level.
Technical Paper

Impact of US02 and Euro4 Emission Legislation on Power Train Cooling Challenges and Solutions for Heavy Duty Trucks

2001-05-14
2001-01-1716
Step by step US and European legislation are defining more stringent emission limits for diesel engines. Depending on these limits for NOx and particulate emissions different emission reduction concepts including or excluding cooled exhaust gas recirculation (EGR) appear over time. Most probable cooled EGR will be the solution for US02 and, in combination with particulate traps, for many Euro4 applications. Competitive aftertreatment solutions like selective catalytic reduction (SCR) may need cooled EGR in addition to meet even tougher emission targets. Therefore cooled EGR can be assumed to be a long term task. The impacts on the power train cooling system arise from the need of high performance EGR systems. This results in increased heat rejection from the EGR cooler and increased pressure and temperature loads on the charge air cooling system.
Technical Paper

Heat Exchanger for Cooled Exhaust Gas Recirculation

1997-05-19
971822
Due to the introduction of new, more stringent exhaust gas emission regulations for diesel engines, expected to be enforced in Europe and the USA in 1999 and 2004, respectively, new emission-reducing technologies are becoming the focus of attention. One such technology is the cooled exhaust gas recirculation method (cooled EGR) which permits a reduction in emissions with only a small increase in fuel consumption. The heat exchanger used in such a system must be capable of meeting high demands in terms of compact design, performance, resistance to high temperatures, corrosion and fouling. The paper describes the development of an EGR cooler designed by Behr which meets these demands and, in particular, has a high performance density. This was achieved by using a new kind of heat exchanger core.
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