Title: A comparative assessment of SPECO and MOPSA on costing of exergy destruction

Authors: Cuneyt Uysal; Dilek Nur Ozen; Huseyin Kurt; Ho-Young Kwak

Addresses: Automotive Technologies Program, TOBB Vocational School of Technical Sciences, Karabuk University, 78050, Karabuk, Turkey ' Mechanical Engineering Department, Faculty of Engineering and Architecture, Necmettin Erbakan University, 42060, Konya, Turkey ' Mechanical Engineering Department, Faculty of Engineering and Architecture, Necmettin Erbakan University, 42060, Konya, Turkey ' Mechanical Engineering Department, Faculty of Engineering, Chung-Ang University, 06974, Seoul, South Korea Blue Economy Strategy Institute Co. Ltd., Focus Buld. 23-10 Hyoryeong-ro, 60-gil, Seocho-gu, Seoul 06721, South Korea

Abstract: This paper presents the comparison of specific exergy costing (SPECO) and modified productive structure analysis (MOPSA) method to test their abilities on costing of exergy destruction. MOPSA method is applied to a combined supercritical CO₂ regenerative cycle and organic Rankine cycle using zeotropic mixtures for gas turbine waste heat recovery system. The results obtained with applying SPECO method to the system are taken from literature. The exergy destruction cost rate of overall system is obtained to be $86.08/h and $1,113.13/h for MOPSA and SPECO methods, respectively. The exergoeconomic factor of overall system is found to be 31.88% for SPECO method, while this value is found to be 85.82% for MOPSA method. The obtained results with applying MOPSA method for exergy destruction cost rate are significantly lower and more consistent compared to the results obtained by SPECO method.

Keywords: specific exergy costing; SPECO; modified productive structure analysis; MOPSA; thermoeconomics; exergy destruction; organic Rankine cycle; supercritical cycle.

DOI: 10.1504/IJEX.2020.107744

International Journal of Exergy, 2020 Vol.32 No.1, pp.62 - 81

Received: 02 Jul 2019
Accepted: 02 Dec 2019
Published online: 12 Jun 2020 *

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