Performance analysis of a novel marine engine waste heat recovery system for combined power and cooling generation

IF 6.9 2区工程技术 Q2 ENERGY & FUELS

Applied Thermal Engineering Pub Date : 2025-10-05 DOI:10.1016/j.applthermaleng.2025.128604

Abdulmalik Alkotami , H.F. Elattar , A. Fouda

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引用次数: 0

Abstract

The maritime industry’s pursuit of energy efficiency and emission reduction requires advanced waste heat recovery (WHR) systems. Shipping accounts for about 3 % of global greenhouse gas emissions, and marine engines release more than 50 % of fuel energy as exhaust heat. Although many studies have examined the Organic Rankine Cycle (ORC) and CO₂ cycles separately, integrated systems that combine power generation with cooling are still underdeveloped. This paper introduces a new combined power and cooling generation (CPCG) system that integrates multiple ORCs to use exhaust waste heat in marine applications, allowing concurrent electricity and refrigeration production with improved overall performance. A detailed thermodynamic model is created using Aspen HYSYS to simulate and optimize the system under real marine operating conditions. System performance is evaluated based on net power output, refrigeration capacity, the coefficient of performance (COP) of the refrigeration cycle, and energy/exergy efficiencies. Different working fluids, including synthetic refrigerants (R245fa, R1233zd(E), R1234yf, R1336mzz-Z) and hydrocarbons (n-butane, n-octane, toluene), are compared. Results show notable improvements, with a maximum net power output of 11.8 MW, a refrigeration capacity of 3.9 MW, a COP of 4.2, and energy and exergy efficiencies of 72.5 and 96 %, respectively. Under optimal conditions, energy efficiency reaches 76.07 %, with a COP of 5.2. Among the ORC working fluids studied, R-1233zd(E) is identified as the most sustainable and environmentally friendly, achieving 77 % energy efficiency. N-butane and other hydrocarbons achieve slightly higher efficiencies of 79 %, but they pose significant safety risks due to flammability. R-245fa is considered environmentally unsustainable. Although NOVEC-649 demonstrates high efficiency, its discontinuation limits its future relevance.

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一种新型船用发动机热电联产余热回收系统的性能分析

海运业对能源效率和减排的追求需要先进的废热回收（WHR）系统。航运业约占全球温室气体排放量的3%，船用发动机释放的燃料能量中有50%以上是废热。尽管许多研究分别考察了有机朗肯循环（ORC）和二氧化碳循环，但将发电与冷却相结合的综合系统仍然不发达。本文介绍了一种新的电力和冷却联合发电（CPCG）系统，该系统集成了多个orc，在船舶应用中利用废气余热，可以同时发电和制冷，提高整体性能。利用Aspen HYSYS建立了详细的热力学模型，在实际的海上操作条件下对系统进行了模拟和优化。系统性能的评估基于净功率输出、制冷量、制冷循环的性能系数（COP）和能源/火用效率。对不同工质，包括合成制冷剂（R245fa、R1233zd(E)、R1234yf、R1336mzz-Z）和烃类（正丁烷、正辛烷、甲苯）进行了比较。结果表明，机组的最大净输出功率为11.8 MW，制冷量为3.9 MW， COP为4.2，能源效率和火用效率分别为72.5%和96%。在最优条件下，节能效率达到76.07%，COP为5.2。在研究的ORC工质中，R-1233zd(E)被认为是最可持续、最环保的，能源效率达到77%。正丁烷和其他碳氢化合物的效率略高，为79%，但由于易燃性，它们存在重大的安全风险。R-245fa被认为是环境不可持续的。尽管novc -649显示出高效率，但其停用限制了其未来的相关性。

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来源期刊

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.