Improving the engine cooling system using a power generation cycle for low-temperature heat source (heat losses in engine) instead of radiator

Highlights: • A supercritical Rankin cycle to improve the cooling system in engine is investigated. • In the present work, seven working fluids are studied. • The results show that The R32 and R143a working fluids are the best working fluid. - Abstract: In this paper, a thermodynamic cycle (supercritical Rankin cycle) to improve the cooling system in engine and producing power from thermal energy available in water exiting from engine of car is investigated. Also, in the present work seven working fluids are studied because the working fluid in this cycle must have low critical temperature or near to the temperature of water exiting from the engine. For comparing working fluids and selecting the best of them, these parameters such as net-work, size of heat exchanger, factor of turbine size and thermal yield were studied by cycle thermodynamic analysis. The results of this analysis show that the working fluids including R32, R143a and Propylene are the best options as working fluid for use in this cycle.