Abstract
One of the major concerns of nowadays is related to the Waste Heat Recovery (WHR) from the thermal engines, especially regarding the high rating power engines. For Diesel tractor engines, long time operated at high loads, the amount of the saved energy is linked to a significant fuel economy. The proposed study is based on the AMESIM simulation code and performs a comparison between two methods of heat recovery: the one using a supplementary turbine (turbo-compound method) and that using an Organic Rankine Cycle (ORC). The tested engine is an IVECO Cursor 10 Diesel engine type, equipping CASE tractors designed for agricultural activities. The energy savings provided by the engine exhaust gas heat recovery could be further used in supplementing the engine traction, either to be delivered to the auxiliary systems, leading in both cases to a decrease of the fuel consumption.
Highlights
By nowadays the society development has reached unprecedented limits comparing to the last decades, but its actual features could not be replaced by the efforts to reduce the consumption of the resources
The waste heat recovery (WHR) from the vehicles engines could be classified in two categories: engine-power train-applied or engine-bottoming technologies, depending if they are directly applied or retrofitted to the engine-power train system, or if they recover wasted engine energy
In case of an engine fueled with lean mixtures of natural gas and by split-injection of Diesel fuel, using various fractions of exhaust gas recirculation (EGR) and various values of injection timings, an increase of 18% of the rating power was obtained, together with the drop of the emissions
Summary
By nowadays the society development has reached unprecedented limits comparing to the last decades, but its actual features could not be replaced by the efforts to reduce the consumption of the resources. Human kind is concerned to increase the efficiency of all the processes, to reduce fuel consumption, to recycle materials etc On this issue, the energy recovery from the internal combustion engines, especially from the heavy ones, with high costs is a dominant preoccupation in the present. In case of an engine fueled with lean mixtures of natural gas and by split-injection of Diesel fuel, using various fractions of exhaust gas recirculation (EGR) and various values of injection timings, an increase of 18% of the rating power was obtained, together with the drop of the emissions Another category of studies refers to the control of an ORC system [9,10,11]. The main conclusions were related to the fact that is no possible to increase the engine efficiency for all the analyzed regimes (the break specific fuel consumption – BSFC has opposite variation from one to another of the regimes), highlighting a slight benefit when using the turbocompund method
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