Article
Thermodynamics
Hang-Suin Yang, Muhammad Aon Ali, Shu-Yi Kuan, Yan-Ting Lin
Summary: A free-piston Stirling engine (FPSE) is investigated in this study, and a theoretical model is developed to determine its operational criterion. The model predicts the displacement of the piston and displacer using equations of motion and establishes the pressure forces exerted by the working fluid. The proposed FPSE design parameters are simplified, and the linearized equations of motion are used to identify the operation criterion and operating frequency.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Zilong Jia, Riying Wang, Jianying Hu, Limin Zhang, Zhanghua Wu, Yanyan Chen, Ercang Luo
Summary: This study established a complete simulation model of the free-piston Stirling generator (FPSG) based on acoustic impedance matching. The coupling relationship between the engine and the linear alternator and the influence of key parameters on the FPSG's performance were systematically investigated. The results showed that the linear alternator parameters directly influence the acoustic impedance at the power piston's surface, and the working pressure affects the linear alternator by changing the working frequency.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Yuanhang Chen, Guoyao Yu, Ying Ma, Jianhua Xue, Fawad Ahmed, Yangbin Cheng, Haojie Sun, Shunmin Zhu, Wei Dai, Ercang Luo
Summary: This study proposes a waste heat recovery system based on a thermally-coupled cascade dual-opposed free-piston Stirling engine. Through a multi-stage arrangement, the system improves overall thermal-to-electric and combined heat and power efficiencies by scavenging different grade heat.
APPLIED THERMAL ENGINEERING
(2024)
Review
Energy & Fuels
Carmela Perozziello, Lavinia Grosu, Bianca Maria Vaglieco
Summary: The free-piston Stirling engine, a type of external combustion engine without mechanical linkages, is preferred for its longer operating life, lower noise pollution, maintenance-free, vibration-free, self-starting, and high thermal efficiency.
Article
Thermodynamics
Muhammad Rashad, S. A. Nada
Summary: This study investigates the performance of a free piston Stirling engine using expansion bellow, which replaces the conventional piston cylinder configuration. The research shows that the starting temperature and maximum stroke of the engine vary with the loading conditions.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Prastowo Murti, Akira Takizawa, Eita Shoji, Tetsushi Biwa
Summary: This study proposes a systematic design guideline for the MCLPSE to achieve a target output power under given temperature conditions, based on an analysis of natural mode oscillations, thermoacoustic theory, and heat transfer models. The designed MCLPSE was numerically verified and successfully achieved the target output power of 102 W under specific heat source and sink temperatures.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Zhijie Jiang, Guoyao Yu, Shunmin Zhu, Wei Dai, Ercang Luo
Summary: As a promising supplement to traditional central electric generation technologies, distributed combined heat and power (CHP) system is beneficial for renewable energy deployment and carbon emissions mitigation. In this study, the performance of a micro-CHP system based on the free-piston Stirling engine (FPSE) is improved through a combination of numerical optimization and experimental validation. The experimental results show a significant improvement in performance.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Hang-Suin Yang
Summary: By simultaneously solving modified non-ideal adiabatic and dynamic models, this study successfully predicted the thermal properties and dynamic behaviors of a free piston Stirling engine. Through the design and performance analysis of a prototype engine, optimum parameters for achieving maximum power output and efficiency were identified, providing valuable insights for future engine designs.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Pengfan Chen, Geyu Zhong, Yafeng Niu, Yingwen Liu
Summary: In this paper, a TD-Sage model is proposed for a beta-type free piston Stirling engine, and the performance of the engine is improved using the response surface methodology and desirability approach. The optimal design parameters and maximum output power are obtained through the analysis of factors and available energy loss analysis.
Article
Thermodynamics
Pengfan Chen, Changyu Deng, Xinkui Luo, Wenlian Ye, Lulu Hu, Xiaojun Wang, Yingwen Liu
Summary: A numerical model that couples thermodynamics with dynamics was developed and experimentally verified in this study. A multi-objective optimization of Stirling engine performance was proposed based on a self-online machine learning optimization approach. The optimal design values resulted in increased dimensionless work and efficiency, while reducing thermal and power losses.
APPLIED THERMAL ENGINEERING
(2024)
Article
Physics, Multidisciplinary
Pritam Chattopadhyay, Ayan Mitra, Goutam Paul, Vasilios Zarikas
Summary: This study examines the connection between uncertainty relations and thermodynamic variables in order to better understand the relationship between efficiency and work in quantum heat engine models. By analyzing quantum systems, the upper and lower bounds on the efficiency of the heat engine are determined through the uncertainty relation.
Article
Energy & Fuels
Wenlian Ye, Weijie Wang, Yuqin Yan, Lingxuan Kong, Yingwen Liu
Summary: This study presents a thermodynamic-dynamic model of a free-piston Stirling engine (FPSE) and investigates the effects of nonlinear coefficients on the engine's performance. The results show that the high nonlinear coefficients of the hardening spring decrease the amplitude and output power while increasing the frequency. On the other hand, the nonlinear terms of the softening spring increase the amplitude and output power but decrease the frequency. The effects of nonlinear pressure terms are not significant, but an increase in the nonlinear load leads to a significant decrease in the engine's performance.
ENERGY SCIENCE & ENGINEERING
(2023)
Article
Energy & Fuels
Haojie Sun, Guoyao Yu, Wei Dai, Limin Zhang, Ercang Luo
Summary: This paper proposes a novel resonance tube-coupled free-piston Stirling engine-based combined cooling and power system. It employs a resonance tube to couple an engine and a cryocooler, and introduces a linear alternator for startup and multiple demands, achieving flexible adjustments and higher exergy efficiency.
Article
Energy & Fuels
Haojie Sun, Guoyao Yu, Wei Dai, Limin Zhang, Ercang Luo
Summary: This paper proposes a novel resonance tube-coupled free-piston Stirling engine-based combined cooling and power system for efficient energy utilization and flexible adjustments, leading to higher exergy efficiency. A time-domain unsteady model was developed to investigate the onset behavior of the system and successfully predict the onset temperature and frequency. Results showed that a resonance tube with larger diameter or shorter length can lead to a lower onset temperature.
Article
Thermodynamics
Pengfan Chen, Peng Yang, Liu Liu, Yingwen Liu
Summary: This study proposed and experimentally verified a thermodynamic-dynamic coupled model to investigate the phase characteristics and output performance of a beta-type free piston Stirling engine (beta-FPSE). The results demonstrated significant influences of heating temperature, cooling temperature, spring stiffness, and damping coefficients on the phase angles of the displacer and power piston. Critical points such as PTI and PDB were identified in the phase variations, indicating important relationships between various parameters and engine performance.
Review
Energy & Fuels
Shahryar Zare, A. R. Tavakolpour-saleh, A. Aghahosseini, M. H. Sangdani, Reza Mirshekari
Summary: This paper discusses the application of soft computing methods in the optimization and design of Stirling engines, including genetic algorithms, particle swarm optimization, fuzzy logic, and artificial neural networks. These soft computing methods can effectively address the main concerns of researchers, and optimizing parameters can improve the performance of Stirling engines.
Article
Thermodynamics
H. Yousefzadeh, A. R. Tavakolpour-Saleh
Summary: This paper presents a novel method to calculate and predict the damping coefficient and overall performance of a kinematic Stirling engine. Through a comprehensive model and experimental validation, the effectiveness of the model was confirmed.
Article
Thermodynamics
Mohammad Hassan Khanjanpour, Mohammad Rahnama, Akbar A. Javadi, Mohammad Akrami, Ali Reza Tavakolpour-Saleh, Masoud Iranmanesh
Summary: In this study, a gamma-type MDT Stirling engine prototype is manufactured, evaluated, and structurally optimized. An inexpensive mathematical evaluation based on FDT approach led to the determination of the optimal swept volume ratio under 450K temperature difference. Experimental results showed good agreement with the theoretical approach, validating its effectiveness in optimizing MTD Stirling engines.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
A. R. Tavakolpour-Saleh, A. Hamzavi, A. Omidvar
Summary: In this paper, a novel active solar heating system with self-blowing capability based on a quasi-Stirling cycle is developed and tested, showing promising performance in providing ventilating air and generating power. The experimental data from the first-stage developed technology reveal the feasibility of the system, which has potential for further optimization and application in real fields.
Article
Thermodynamics
A. R. Tavakolpour-Saleh, Shahryar Zare
Summary: This paper presents a novel lumped mechanical model incorporating modern control theory to investigate performance and startup condition of thermo-acoustic Stirling engines (TASEs). The study reveals that TASEs can be considered as physical regulators from the viewpoint of modern control theory. Design parameters and quality index are analyzed to evaluate resonance phenomenon in the TASEs, and the proposed mathematical model incorporating the control-based design technique is validated using practical data of three prototype engines.
Article
Thermodynamics
Shahryar Zare, A. R. Tavakolpour-Saleh
Summary: This article models, constructs, and tests a diaphragm thermoacoustic Stirling engine, confirming the working principle of the thermoacoustic system and predicting a stable limit cycle in the engine's nonlinear dynamic response. Experimental results validate the mathematical model, demonstrating that the inexpensive engine can operate at a frequency of 13.8 Hz.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Engineering, Mechanical
M. M. Farzaneh, A. R. Tavakolpour-Saleh
Summary: This paper presents a new and practical neural network-based optimal control method for a quadrotor system. By extracting the kinematic relations and dynamic model of the quadrotor, a neural network controller is used to overcome the system's nonlinearities and unstable dynamics, achieving minimum error through weight optimization.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2022)
Review
Thermodynamics
Shahryar Zare, A. R. Tavakolpour-Saleh, A. Aghahosseini, Reza Mirshekari, Geng Chen
Summary: This study reviews the components and parameters of thermoacoustic Stirling engines and their impact on engine performance, emphasizing the importance of precise design.
INTERNATIONAL JOURNAL OF GREEN ENERGY
(2023)
Article
Mathematics, Interdisciplinary Applications
Shahryar Zare, A. R. Tavakolpour-Saleh, T. Binazadeh
Summary: This paper presents an analytical and parametrical scheme based on practical stability and dynamic error to evaluate the existence of a stable limit cycle in free piston Stirling engines (FPSEs). Nine parametric conditions are provided to satisfy the sufficient condition for a stable oscillation of the FPSE. Additionally, a design criterion for evaluating design accuracy is proposed. The method is evaluated through two experimental case studies and shown to accurately predict the sufficient condition of the FPSEs.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Engineering, Mechanical
Shahryar Zare, Fathollah Pourfayaz, A. R. Tavakolpour-Saleh, Amirreza Mohammadian, Reza Mirshekari
Summary: This paper presents a novel approach to studying a thermoacoustic Stirling engine, combining passive control and a genetic algorithm. The effectiveness of the technique is verified through mathematical modeling and design parameter estimation.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Energy & Fuels
Shahryar Zare, Maedeh Makki, Masoud Rasooli, Hassan Shafiee Alavi, A. R. Tavakolpour-Saleh
Summary: This study presents a method to estimate the design parameters of a diaphragm thermoacoustic Stirling engine and investigate its stable limit cycle. The results indicate that the estimated design parameters satisfy the sufficient condition.
INTERNATIONAL JOURNAL OF ENERGY AND ENVIRONMENTAL ENGINEERING
(2023)
Proceedings Paper
Automation & Control Systems
M. R. Kheshti, A. R. Tavakolpour-Saleh, R. Razavi-Far, J. Zarei, M. Saif
Summary: In this study, a genetic algorithm-based sliding mode controller is designed to assist spinal cord injured patients in controlling the movement of their arm. The kinematics and dynamics of the arm are modeled using planar three links, and a genetic algorithm is utilized to tune the convergence rate of the sliding mode controller for appropriate tracking performance.
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.
