Design Analysis of Power Recovery Systems for Cabin Exhaust Air

To recover the power from the cabin's exhaust, two schemes are proposed and the thermodynamic parameters and the components' performance of the two schemes are analysed in this study. Based on the take-off gross weight method, the differences among the two proposed schemes and the state-of-the-art scheme are compared. Results show that compared to the value of state-of-the-art scheme, the fuel penalty loss of scheme I adds 24.4 kg and that of scheme II increases 29.1 kg. In consideration of the compression ratio of the electrical driven compressor, that for scheme I is 1.13 and for scheme II is 2.24. With respect to the value of the state-of-the-art scheme of 2.8, there are about 60% and 21% reduction respectively in the two newly-proposed schemes. Obviously, the two proposed schemes can significantly improve the fresh air pressure and reduce the demand for the performance of the electrical driven compressor, which will be more suitable for the development of the electrical environmental control system.