Method for making a multi-pass exhaust gas recirculation cooler

Details Method for making a multi-pass exhaust gas recirculation cooler Method for making a multi-pass exhaust gas recirculation cooler

2005-08-16

2005-08-16

Compton, Eric (Department: 3726)

Metal working

Method of mechanical manufacture

Heat exchanger or boiler making

C029S890039, C060S039520, C165S146000, C165S166000, C165SDIG009

Reexamination Certificate

active

06928730

ABSTRACT:
An apparatus and method for cooling hot fluids, especially exhaust gases, with a multi-pass cooler core. The cooler core is particularly useful for cooling exhaust gases flowing in an exhaust gas recirculation (EGR) system or regime in operative association with an internal combustion engine, such as a diesel engine. Cooled gases are recirculated to the engine input to help reduce noxious exhaust emissions. The invention utilizes unequal areas-in-flow between the first exhaust pass through the core and the second and subsequent passes through the core. The first pass through the core features an area-in-flow comparatively larger than the area-in-flow of the second pass. The difference in areas-in-flow between passes influences gas velocities to reduce fouling, despite changes in exhaust gas temperature between passes through the core.

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