advanced exergy scrutiny of a dual-loop organic rankine cycle for waste heat recovery of a heavy-duty stationary diesel engine

In this paper, the normal exergy scrutiny (nes) and advanced exergy scrutiny (aes) of a waste heat recovery (whr) system was performed. the proposed system contains a dual-loop organic rankine cycle (dorc) which recovers the available waste heat of the intake air, exhaust gas, and coolant streams of a 12-cylinder heavy-duty stationary diesel engine. a well-known method of the aes called the thermodynamic cycle approach is utilized to determine each component exergy destruction parts namely exogenous/endogenous, unavoidable/avoidable, etc. results showed that 59.04 kw from the 258.69 kw total exergy destruction rate of the system could be eliminated (22.82% of the total exergy destruction rate). the total avoidable exergy destruction part of the low-temperature loop accounts for 46.62 kw, which indicates that it requires more attention than that of the high-temperature loop by 12.42 kw. furthermore, it is revealed that to enhance the overall productivity of the system, there is a relatively significant difference in priority order regarding the improvement of system components. the aes has proposed this ranking for improvement priority of components: condenser, expander 2, expander 1, respectively. while the nes has specified the priority as the evaporator 1, condenser, expander 2, respectively.