Title: Analysis of main engine various waste heat cascade recovery systems under different evaporation pressure

Authors: Changxin Liu; Huaan Li; Shanshan Yu; Zhenyu Du; Gaohui Li; Tianyang Yu; Jingming Dong; Zhitao Han

Addresses: College of Marine Engineering, Dalian Maritime University, Dalian, China ' College of Marine Engineering, Dalian Maritime University, Dalian, China ' College of Information Science and Technology, Dalian Maritime University, Dalian, China ' College of Marine Engineering, Dalian Maritime University, Dalian, China ' College of Marine Engineering, Dalian Maritime University, Dalian, China ' College of Marine Engineering, Dalian Maritime University, Dalian, China ' College of Marine Engineering, Dalian Maritime University, Dalian, China ' College of Marine Engineering, Dalian Maritime University, Dalian, China

Abstract: In this paper, a novel technology, which is the thermal power generation (TEG)-organic Rankine cycle (ORC) combined cycle system, is proposed to recycle cascade utilisation of main engine waste heat. Evaporation pressure of working fluid (P) is an important parameter affecting the combined cycle, but its performance in the TEG-ORC combined cycle is unknown. Therefore, the TEG-ORC experimental device is built in this paper, and the environmentally friendly R245fa is employed to study the variation of the main parameters such as the system net power output (W_net), system thermal efficiency (η_s), power-production cost (C_g), and waste heat utilisation of main engine flue gas (f_g) under different evaporation pressure (P). When the P is 0.75 Mpa, the output performance of the system parameters is optimal. The W_net, η_s, waste heat utilisation power (_Wp), C_g, and rate of f_g, is 483.25 W, 8.34%, 5796.72 W, 0.3464 $ /kWh, and 69.05 %, respectively.

Keywords: main engine waste heat; energy efficiency; cascade utilisation; TEG-ORC combined cycle; evaporation pressure.

DOI: 10.1504/IJEX.2023.129797

International Journal of Exergy, 2023 Vol.40 No.3, pp.263 - 281

Received: 11 Apr 2022
Received in revised form: 29 May 2022
Accepted: 14 Jul 2022
Published online: 30 Mar 2023 *

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