Performance analysis of applying ORC cycle to recover the wasteheat of an airplane engine

Due to energy shortage and global warming, issues of energy saving have becomemore important. To increase the energy efficiency and reduce the fuel consumption,waste heat recovery is a significant method for energy saving. The organic Rankinecycle (ORC) has great potential to recover the waste heat from the core jet exhaustof a turbofan engine and use it to produce power. The results of the analyzes showthat the output power of the double-shaft turbofan engine is ۱۲۵۴۸ kW while thepower produced by the ORC cycle is ۶۳۲.۴۱ kW. The energy efficiency and exergyof the proposed system are ۴۳.۵۵% and ۸۷.۰۹%, respectively. Also, the exergydestruction rate of the whole system is ۱۱۲۵۰۰ kW. The highest amount of exergydestruction occurs in the low-pressure compressor, fan and mixer, respectively, andspecial attention should be paid to these components. As the inlet temperature ofthe high-pressure turbine of the turbofan engine increases, the energy and exergyefficiency decrease while the amount of exergy destruction increases.

Keywords:

Waste heat recovery , ORC cycle , Turbofan engine , Thermodynamic analysis