... 30(11): 160 2-1 609. [26] Cheng C, Chen C. Ecological optimization of an endoreversible Brayton-cycle. Energy Convers. Manage., 1998, 39(1/2):3 3-4 4. [27] Khaliq A, Kumar R. Finite-time heat-transfer ... surface area of the high- temperature-side heat exchanger , β is the overall heat transfer coefficient and 2F is the heat-transfer surface area of the low-temperature-side heat exchanger. ... maximum-power output, maximum-ecological function value, the minimum-entropy generation rate and the corresponding efficiencies with internal irreversibility are smaller than those without...