First and Second Law Analysis of Radical Intercooling Concepts
Journal article, 2018

An exergy framework was developed taking into consideration a detailed analysis of the heat exchanger (HEX) (intercooler (IC)) component irreversibilities. Moreover, it was further extended to include an adequate formulation for closed systems, e.g., a secondary cycle (SC), moving with the aircraft. Afterward, the proposed framework was employed to study two radical intercooling concepts. The first proposed concept uses already available wetted surfaces, i.e., nacelle surfaces, to reject the core heat and contributes to an overall drag reduction. The second concept uses the rejected core heat to power a secondary organic Rankine cycle and produces useful power to the aircraft-engine system. Both radical concepts are integrated into a high bypass ratio (BPR) turbofan engine, with technology levels assumed to be available by year 2025. A reference intercooled cycle incorporating a HEX in the bypass (BP) duct is established for comparison. Results indicate that the radical intercooling concepts studied in this paper show similar performance levels to the reference cycle. This is mainly due to higher irreversibility rates created during the heat exchange process. A detailed assessment of the irreversibility contributors, including the considered HEXs and SC, is made. A striking strength of the present analysis is the assessment of the component-level irreversibility rate and its contribution to the overall aero-engine losses.

Heat exchangers


Aircraft engines

Heat transfer

Exergy analysis


Oskar Thulin

Chalmers, Mechanics and Maritime Sciences, Fluid Dynamics

Olivier Petit

Chalmers, Mechanics and Maritime Sciences

Carlos Xisto

Chalmers, Mechanics and Maritime Sciences, Fluid Dynamics

Xin Zhao

Chalmers, Mechanics and Maritime Sciences

Tomas Grönstedt

Chalmers, Mechanics and Maritime Sciences, Fluid Dynamics

Journal of Engineering for Gas Turbines and Power

0742-4795 (ISSN) 1528-8919 (eISSN)

Vol. 140 8 081201-081201-10 GTP-17-1366

Subject Categories

Mechanical Engineering

Aerospace Engineering

Energy Engineering

Vehicle Engineering

Fluid Mechanics and Acoustics

Driving Forces

Sustainable development



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Latest update

7/4/2018 9