Recently renewable energy, energy storage system, and microgrid technology, self generation systems using diesel generators have been gradually increasing.
Diesel generators were often used as an emergency power supply in a small town or island regions. However, most electricity rate compared to the installed capacity of the islands were being equipped with inefficient fuel consumption and also operating in the region was ineffective. As such the island remained as a low-load operation region due to operating of poor fuel efficiency of diesel generators. To deal with people''s excessive power demand, development of modular hybrid energy system(solar, energy storage system, diesel generators) were studied. Therefore, the capacity of a diesel generator to prevent the low efficiency operation of the large capacity of the generator was considered. In an emergency case, solar power may not be able to cover the maximum power output of the diesel generator.
In this study, it was performed to estimate changes of engine performance and exhaust emission characteristics for the CRDI engine with turbocharger, intercooler and EGR. As a result, when the turbocharge and intercooler were applied, the maximum power was increased by 110% and BSFC was improved. In presence of intercooler, intake air temperature decreased, intake air density and amount of intake air increased. Considering the basic condition of the exhaust emission characteristics, when the engine speed (1000, 1500, 1800, 2000, 2500rpm) was increased, CO, Smoke and NOx were increased. but when the turbocharger and intercooler were applied, exhaust emission were reduced. In order to reduce NOx, this study used the EGR : 0, 5, 10%, then NOx were reduced by 20%. Also we have investigated the size distribution of particulate matters with engine operation conditions by FE-SEM (field emission scanning electron microscope). Consequently, this research indicates that CRDI engine can be used as an effective alternative diesel generator engine.