Title: Performance investigations under maximum ecological and maximum economic conditions of a complex Brayton cycle

Authors: S.K. Tyagi, S.W. Wang, G.M. Chen, Q. Wang, H. Chandra, C. Wu

Addresses: Department of Building Services Engineering, The Hong Kong Polytechnic University, Hunk Hom, Kowloon, Hong Kong. ' Department of Building Services Engineering, The Hong Kong Polytechnic University, Hunk Hom, Kowloon, Hong Kong. ' Institute of Refrigeration & Cryogenics, Zhejiang University, Hangzhou 310027, People's Republic of China. ' Institute of Refrigeration & Cryogenics, Zhejiang University, Hangzhou 310027, People's Republic of China. ' Mechanical Engineering Department, Madhav Institute of Technology & Science Gwalior (MP) 474005, India. ' Mechanical Engineering Department, US Naval Academy, Annapolis MD 41202, USA

Abstract: A complex Brayton cycle is investigated under maximum economic and maximum ecological conditions. The economic function defined as the power output divided by the total cost, while the ecological function defined as the power output divided by the entropy generation rate, is optimised with respect to the cycle temperatures, reheat and intercooling pressure ratios for a typical set of operating conditions. It is found that there are optimal values of the turbine outlet temperature, intercooling, reheat and cycle pressure ratios at which the cycle attains the maximum values of the economic function, ecological function power output, efficiency and the minimum entropy generation rate.

Keywords: complex Brayton cycle; economic function; ecological function; entropy generation rate; efficiency; power output; exergy.

DOI: 10.1504/IJEX.2007.011582

International Journal of Exergy, 2007 Vol.4 No.1, pp.98 - 116

Published online: 03 Dec 2006 *

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