Power output, thermal efficiency and exergy-based ecological performance optimizations of an irreversible KCS-34 coupled to variable temperature heat reservoirs. (1st February 2020)

• Record Type: Journal Article
• Authors: Feng, Huijun; Qin, Wanxu; Chen, Lingen; Cai, Cunguang; Ge, Yanlin; Xia, Shaojun
• Is Part Of: Energy conversion and management. Volume 205(2020)
• Publication Date: 2020-02-01
• Subjects: AC ammonia concentration -- AWM ammonia-water mixture -- EF ecological function -- EGR entropy generation rate -- EOD evaporator outlet dryness -- FTT finite-time thermodynamics -- HE heat exchanger -- HR heat reservoir -- HTA heat transfer area -- HTR high temperature recuperator -- KC Kalina cycle -- KCS-34 Kalina cycle system 34 -- LTR low temperature recuperator -- MFR mass flow rate -- OD optimal distribution -- ORC organic Rankine cycle -- PLO parabolic-like one -- PO power output -- TE thermal efficiency -- VTHR variable temperature heat reservoir -- WF working fluid; Kalina cycle system 34 -- Irreversible process -- Power output -- Thermal efficiency -- Ecological function -- Finite-time thermodynamics; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2019.112424
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: A variable temperature heat reservoir irreversible KCS-34 model is established. Finite-time thermodynamics is applied for performance optimization. Power, efficiency and ecological function are derived and maximized. Heat transfer area distributions are optimized for three objectives. Three objectives are increased by 17.27%, 5.79% and 1.05%, respectively. Abstract: An irreversible Kalina cycle system 34 (KCS-34) model with variable temperature heat reservoirs is studied by using finite-time thermodynamics. The power output, thermal efficiency and exergy-based ecological function of the KCS-34 are derived, and the effects of evaporator outlet dryness and mass flow rate of the working fluid on these performances are analyzed. With constant total heat transfer area, the heat transfer area distributions are optimized, and the optimal performances of the KCS-34 are obtained. The results show that the power output, thermal efficiency and ecological function have their triple maximum by optimizing the heat transfer area distributions, and the optimal distributions are different from each other. The ecological function shows a trade-off between power output and thermal efficiency to some extent. Compared with the initial designs, the power output, thermal efficiency and ecological function after triple optimizations of the heat transfer area distributions are increased by 17.27%, 5.79% and 1.05%, respectively. It shows that parameter optimization is important to improve the performances of the KCS-34, and the corresponding optimization work is significant.