Thermodynamic Evaluation of Energy Recovery System For Heavy Duty Diesel Engine by using Organic Rankine Cycle

Authors : Tolga YASA

Pages : 573-583

Doi:10.18038/aubtda.303809

View : 11 | Download : 8

Publication Date : 2017-09-30

Article Type : Research Paper

Abstract :The internal combustion engine is used daily for transportation and energy production beside their low thermal efficiency level. Most of the thermal energy in such engines is wasted. Therefore, energy recovery in diesel engines are crucial in order to enhance their performance and the environmental penalty. The present paper discusses the energy recovery potential of internal combustion engine cooling system by using organic Rankine cycle (ORC). An   heavy-duty diesel engine that has a maximum brake power rating of about 345 kW is selected for the energy recovery potential investigation. Around eighty different type organic fluid is considered as the working fluid. Operability margin of each fluid as a function of   cooling system pressure is identified based on fix evaporator and condensation conditions. The mass flow rates required for each ORC system are computed together with the cycle thermal efficiencies for each cycle conditions. The results show that such ORC system is capable of recovering up to 13.6% of the wasted heat which corresponds to a power recovery of about 24 kW and enhances the diesel engine brake efficiency by 2.4%.
Keywords : Organic Rankine cycle, Internal combustion engine, heat recovery, sustainable energy