Green Guide: Green Manufacturing 101
Exhaust Gas Heat Exchanger Reduces CO2 Emissions
“Many vehicles spend much of their working life in urban conditions making short trips, which may mean they reach full operating temperature near the end of the trip or not at all, especially in winter months. EGHX improves fuel economy under these conditions for internal combustion and especially hybrid powertrains.”
That’s James Bertrand, president, Delphi Thermal Systems, talking about Delphi Automotive’s (delphi.com) exhaust gas heat exchanger (EGHX). The EGHX is designed to reduce CO2 emissions, provide faster cabin warm-up, and yield savings during cold starts. In addition, it recovers heat normally expelled by the exhaust system (in a normal vehicle about one-third of the heat is wasted this way) and uses it to quickly warm up the coolant, which in turn warms up parts of the engine or the transmission fluid.
Not only is this beneficial for smaller, fuel-efficient engines that have comparatively reduced heat generation, an important potential application for the EGHX is in hybrids, which normally have to run their engines longer in cold weather to keep the cabin warm. Recovering heat from the exhaust could allow the engines to be switched off and operate in electric mode sooner.
Bertrand says that there is another benefit to the system for those who have a tendency to let their cars “warm-up” for extended periods during the winter: “Further reductions in emissions are expected when drivers realize they no longer need to leave their vehicle idling before driving off in order to defrost the windows. Drivers with EGHX will notice that they can begin driving earlier and be comfortable much more quickly.”
The product will be ready for application later this year.