Exhaust Gas Heat Recovery Systems
Rising interest in the technology with advent of electrification in engines
The internal combustion engine is still relevant today with most of the vehicles in the world. It is however observed that a large amount of energy generated by burning fuel is wasted via the exhaust manifold. Under a broad approximation, it can be stated that the exhaust gas in an ICE vehicle carries 25-30% of heat produced from the engine. Whilst 100% recovery of heat lost in exhaust gases is an impossibility, a substantial amount of heat can be recovered with the use of exhaust heat recovery systems. Automotive OEMs and suppliers are currently highly focused on improving fuel consumption and reducing emissions and hence are driven to explore the use of technologies such as Exhaust Gas Heat Recovery Systems (EHRS). The function of an EHRS is to transmit heat from the exhaust gas to the engine coolant via the heat exchanger. It helps in engine warm-up, engine usage optimization, and improves fuel efficiency. Additionally, thermal efficiency is enhanced with repurposing of heat for cabin comfort purposes in the automobile. EHRS is one of several key approaches to reduce carbon emissions in next generation of vehicles.