Modeling, Simulation, and Comparison of 50 kW Gas Engine Cooling System

• Main Author: Aliya Khalida, Puti
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/43642
• Institution: Institut Teknologi Bandung

An alternative to generate electricity in rural areas of Indonesia is by using an engine that is compact and can use easily accessible fuel. For an engine to operate optimally, a cooling system is needed. Modeling an engine cooling system, simulating, and evaluating the result of the model could save time and money compared to manufacturing a real cooling system and putting it through various tests. The engine used as a reference in designing the cooling system model is a gas engine currently made by an Indonesian company. There are two types of cooling system modeled, one with an oil cooler (OC) and one without (NOC). Both models are made in Simscape. Two simulations were conducted for each model; first simulation in normal operating condition with engine speed of 1,500 rpm and 50 kW power, and second simulation in maximum operating condition with engine speed of 2,200 rpm and 75 kW power. Both simulations have a run time of 24 hours. In the first simulation, NOC model oil overheats at 12.5 hours. Minimum water pump required flow rate is 7.12 kg/s. In the second simulation, NOC model oil overheats after 5.5 hours and minimum water pump flow rate required is 7.23 kg/s. In the first simulation, OC model oil and cylinder wall temperature stabilizes after 12 hours and minimum water pump required flow rate is 7.16 kg/s. In the second simulation, OC model oil and cylinder wall temperature stabilizes after approximately 4 hours and minimum water pump required flow rate is 7.25 kg/s. From both simulation it can be concluded that in normal operating condition, NOC is recommended for an operating hour of 12 hours or less, while OC is recommended for operating hour of 24 hours or more. In maximum operating condition, NOC is not recommended since it can only operate for 5.5 hours before the oil overheats, and OC is capable of operating for 24 hours or more.