Simulation and performance optimization of a novel hybrid CCHP system based on the prime movers of internal combustion engine and Stirling engine

IF 10.1 1区工程技术 Q1 ENERGY & FUELS

Applied Energy Pub Date : 2025-05-19 DOI:10.1016/j.apenergy.2025.126103

Mohammad Sheykhi , Mahmood Mehregan , Saeed Ghorbani , Amin Emamian , Mohammad Hassan Kayhani , Amin Amiri Delouei , Shahabodin Kharazmi , Mohammad Kazem Sheykhian , Shunmin Zhu

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Abstract

Combined cooling, heating, and power systems (CCHP) could increase the efficiency of conventional energy supply systems and mitigate carbon emissions. In this paper, a novel arrangement of a combined cooling, heating, and power (CCHP) system is presented with prime movers of internal combustion and Stirling engines, which are numerically simulated by Range-Kutta method and optimized with the genetic algorithm technique. The influence of some key parameters such as Stirling engine speed, phase angle, length and porosity of Stirling engine's regenerator, and also speed and spark timing of the internal combustion engine, on the capacity, efficiency, primary energy saving and the investment payback period of the CCHP system has been discussed. The results illustrated that using the CCHP system with hybrid prime movers, due to the appropriate efficiency of the combustion engine, allows the Stirling engine to be started at high speeds. In this condition, the overall efficiency of the hybrid system is increased by 12 % compared to using the CCHP system with only the Stirling engine. Additionally, the payback period of the CCHP system with combined prime movers at 3500 rpm for the two engines is approximately 4.4 years, which is about 1.6 years shorter than the payback period of the CCHP system based solely on the internal combustion engine. This work provides valuable insights into the design and optimization of hybrid CCHP systems with two different combustion-based prime movers.

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基于内燃机和斯特林发动机原动机的新型混合热电联产系统仿真及性能优化

联合制冷、供暖和电力系统（CCHP）可以提高传统能源供应系统的效率，并减少碳排放。本文提出了一种以内燃机和斯特林发动机为原动机的新型冷热电联产系统布置方案，并采用Range-Kutta法对其进行了数值模拟和遗传算法优化。讨论了斯特林发动机转速、相位角、斯特林发动机蓄热器长度和气孔率以及内燃机转速和火花正时等关键参数对热电联产系统容量、效率、一次节能和投资回收期的影响。结果表明，使用混合动力原动机的CCHP系统，由于内燃机的适当效率，允许斯特林发动机在高速启动。在这种情况下，混合动力系统的整体效率比仅使用斯特林发动机的CCHP系统提高了12%。此外，两台发动机在3500rpm转速下组合原动机的热电联产系统的投资回收期约为4.4年，比单独使用内燃机的热电联产系统的投资回收期缩短约1.6年。这项工作提供了宝贵的见解，设计和优化混合CCHP系统与两个不同的燃烧为基础的原动机。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Energy 工程技术-工程：化工

CiteScore

21.20

自引率

10.70%

发文量

1830

审稿时长

41 days

期刊介绍： Applied Energy serves as a platform for sharing innovations, research, development, and demonstrations in energy conversion, conservation, and sustainable energy systems. The journal covers topics such as optimal energy resource use, environmental pollutant mitigation, and energy process analysis. It welcomes original papers, review articles, technical notes, and letters to the editor. Authors are encouraged to submit manuscripts that bridge the gap between research, development, and implementation. The journal addresses a wide spectrum of topics, including fossil and renewable energy technologies, energy economics, and environmental impacts. Applied Energy also explores modeling and forecasting, conservation strategies, and the social and economic implications of energy policies, including climate change mitigation. It is complemented by the open-access journal Advances in Applied Energy.