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Development of an Air-Cooled Induction Manifold for Diesel Engines in Hot and Humid Climate


 Extreme weather conditions in the Gulf, Qatar has been taken as an example in this study, tend to be hot and humid mostly throughout the year, especially in the summer. Such weather negatively affects the performance and emissions of all combustion engines, in particular diesel engines. In this work, a modified air-conditioning system was designed for controlling the inlet air temperature and humidity of a naturally aspirated single-cylinder diesel engine. The study investigated the effect of running the engine at different controlled inlet air temperatures on the engine performance and emission characteristics. It was found that running the engine at 20°C inlet air temperament comparing to 45°C, the average ambient air temperature during summer, could increase the in-cylinder peak pressure by 10%, and the volumetric efficiency of the engine by 8.5%. Moreover, the A/F ratio has increased by 27.5% with 20°C compared to 45°C, while minor effect was observed on the specific fuel consumption. For the emissions, there was a considerable reduction rate in NOx emissions with about 83% at 20°C as well as 50% reduction in HC emissions compared to 45°C. Furthermore, the smoke emission has decreased by 40% at the engine full load. It was also proved that using the air-conditioning system of a vehicle to cool the intake air temperature is visible, as the net gained power of the engine has increased by 14.5% when running at 20°C compared to 45°C.