Test on a CO2-based Transcritical Power Cycle (CTPC) under Various ENGIEN Conditions

orc2019 Tracking Number 90

CO2-based transcritical Power Cycle (CTPC) could be used for engine waste heat recovery as the safety and environment-friendly characteristic of fluid, which also satisfies miniaturization demand of recovery systems. Through previous investigation, the results showed that waste heat of exhaust gas and engine coolant can be combined and highly recovered by the CTPC, while other ORCs showed lower utilization capacity of engine coolant. In this study, a kW-level CTPC system was constructed as the bottoming system and experimentally investigated to recover waste heat from exhaust gas and engine coolant of a heavy-duty diesel engine (DE). Test was based on constant operating condition of CTPC, while operating condition of the DE considered the variation engine speed and engine torque. The CTPC system performance changing with different waste heat conditions are main focus points of this study. Observations of key states as well as estimations and comparisons of potential output power were carried out stepwise. Results indicated that performance of CTPC showed following trend of increase with an increase in waste heat conditions, which were caused by increasing engine speed and engine torque.