Abstract
As CO2 is emerging as an environment friendly working fluid its applicationin high temperature engine’s waste heat recovery systems is found to bemore suitable than other hydrocarbons. This paper presents a performancecomparison of two systems based on transcritical Rankine cycle using CO2as working fluid. A heavy-duty truck is opted for analysis in which coolantis used to preheat CO2 and further the engine exhaust is used to transferthe heat to main heater. The System-1 and System-2 having single and dualloop based transcritical Rankine cycle are analysed. The independent param-eters taken for the investigative analysis are turbine inlet temperature (TIT),pressure ratio and effectiveness of heat exchangers. Comparison results showthat System-2 is producing 11.8 kW more power than system-1 at 12 MPapressure ratio and at 489◦C TIT. However, under same conditions, system-1 ishaving 16.88% of thermal efficiency which is higher than system-2 by around3%. Further, the Engine coolant utilization rates when compared are nearlysame in both the systems, the exhaust gas utilization rate came out higherfor System-2. In respect of exergy destruction, system-1 shows maximumdestruction in regenerator and System-2 in heater-2.
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