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.
Article
Multidisciplinary Sciences
Halit Karabulut, Can Cinar, Tolga Topgul, Latif Kasim Uysal
Summary: In this study, a structurally simple alpha-type Stirling engine was proposed and analyzed using combined thermodynamic-dynamic analysis. The results showed that the novel engine had higher power and thermal efficiency despite having a lower compression ratio and working fluid pressure compared to other engines.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Thermodynamics
Ermerson F. de Moura, Izabela B. Henriques, Guilherme B. Ribeiro
Summary: With the advancement of the new space era, there is an increasing need for long-term missions beyond Earth's orbit, such as Mars and Moon exploration. These missions are more complex in terms of duration and energy demand. In this study, a thermodynamic model of a nuclear-powered Stirling cycle coupled with a dynamic engine model was developed to provide insights into the system performance. The results showed that the regenerator efficiency and compression ratio have significant effects on the engine efficiency. The best parameters yielded a system with a power output of 260.5 kW and a power density of 35.38 kg.kW(-1). This study serves as a theoretical guideline for the future design of nuclear-powered Stirling engines for space applications.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Energy & Fuels
George-Rafael Domenikos, Irene Koronaki, Theodoros Papingiotis, Panagiotis Bitsikas
Summary: This paper presents a parametric analysis on a beta-type Stirling engine, focusing on the impact of various rotational speeds. By utilizing a three-dimensional computational fluid analysis model, the study monitors and understands the temperature variations across the engine's primary components, and provides insights into the optimal working conditions based on the analysis results.
Article
Thermodynamics
Cengiz Yildiz, Fatma Bayata, Ata Mugan
Summary: In this study, an alpha type Stirling engine was optimized using artificial neural network (ANN) model to predict and optimize power and efficiency. The research successfully found the optimal design parameters and predicted the engine performance. Ultimately, the use of ANN model proved to be a fast, accurate, and powerful method in solving the associated optimization problem.
ENERGY CONVERSION AND MANAGEMENT
(2021)
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
Energy & Fuels
Chin-Hsiang Cheng, Duc-Thuan Phung
Summary: The study presents a three-dimensional CFD model for simulating a compact 100-W beta-type Stirling engine, and explores the influence of various parameters on engine performance in terms of power and thermal efficiency. Results show that heating temperature, cooling temperature, and piston length have significant effects on both power output and thermal efficiency of the engine.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Energy & Fuels
George Antonakos, Irene Koronaki, George-Rafael Domenikos, Serafeim Baltadouros
Summary: Three distinct thermodynamic analysis models are developed and applied to a renowned cryogenic engine (PPG-102). The comprehensive evaluation of the theoretical outcomes derived from these models demonstrates significant convergence. The simulation results closely approximate the outcomes of the adiabatic analysis, corroborating the validity and effectiveness of this particular model.
Article
Energy & Fuels
Lei Xiao, Kaiqi Luo, Ercang Luo, Jingyuan Xu
Summary: A unified fast transient simulation method called time-domain acoustic-electrical analogy (TDAEA) method has been developed for thermoacoustic and Stirling systems. The method captures the main acoustic impedance characteristics of the components and simplifies the calculations using lumped models, resulting in significantly reduced computation. Model verifications on a free-piston Stirling generator and a heat-driven thermoacoustic refrigerator demonstrate the effectiveness and accuracy of the method.
Article
Thermodynamics
A. Rahmati, S. M. Varedi-Koulaei, M. H. Ahmadi, H. Ahmadi
Summary: The study focuses on dynamic synthesis of the alpha-type Stirling engine and aims to reduce output velocity fluctuations through optimizing the links' lengths and mass distribution. Results show a significant reduction in velocity fluctuations and an improvement in efficiency through various optimization methods.
Article
Thermodynamics
Khaled M. Bataineh, Moath F. Maqableh
Summary: This study presents a thermodynamic model for a beta-type Stirling engine with a rhombic-drive mechanism and improves its accuracy at high speeds. The modified model considers power loss due to inertial forces and variations in gas temperature inside the heater and cooler with engine speed. The developed numerical model is evaluated against experimental data and shows superior performance and accuracy at high speeds compared to previous models.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Thermodynamics
Hang-Suin Yang, Hao-Qiang Zhu, Xian-Zhong Xiao
Summary: This study investigates the dynamic characteristics and performance of beta-type Stirling engines (BTSEs) with five driving mechanisms. A thermodynamic model is used to predict the variations in the thermal properties of the working fluid, and friction losses are considered in the dynamic models. The results show that the trajectories of the piston and displacer significantly affect the performance of BTSEs. Among the five mechanisms, BTSEs with the bell crank mechanism achieve the highest shaft power (1533 W) at 550 rpm, with a mechanical efficiency of 80.5%.
Article
Thermodynamics
Junxi Jia, Manosh C. Paul
Summary: A combined cooling, heating and power system based on biomass gasification is proposed. The system evaluates the energy and exergy efficiencies and economic performance under different working conditions. The inclusion of a Stirling engine and the recycling of weak solution contribute to improved power output and efficiency.
ENERGY CONVERSION AND MANAGEMENT
(2024)
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
Energy & Fuels
Chin-Hsiang Cheng, Duc-Thuan Phung
Summary: The study presents a three-dimensional CFD model for simulating a compact 100-W beta-type Stirling engine, and explores the influence of various parameters on engine performance in terms of power and thermal efficiency. Results show that heating temperature, cooling temperature, and piston length have significant effects on both power output and thermal efficiency of the engine.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Thermodynamics
Chin-Hsiang Cheng, Jian-Hua Feng, Jhen-Syuan Huang
Summary: This paper focuses on the development of a thermodynamic model and a heat-driven Vuilleumier refrigerator, analyzing the thermodynamic properties and performance. A prototype Vuilleumier refrigerator with a crank drive mechanism was built and its performance measured. The effects of various parameters on the cold head temperature were evaluated and numerical results were validated against experimental data.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Energy & Fuels
Chin-Hsiang Cheng, Jhen-Syuan Huang
Summary: This study aimed to develop a tri-generation system that converts thermal energy into mechanical power, cooling, and heating. By combining a Stirling cooler and a Stirling engine, the system achieved high overall efficiency of approximately 91%, as demonstrated by experiments closely aligning with numerical predictions.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Chin-Hsiang Cheng, Surender Dhanasekaran
Summary: This study focuses on the development of a Permanent Magnet Linear Alternator (PMLA) and parametrically analyzes it to predict its limitations and performance. By varying operable conditions and material choice, the machine is analyzed and tested for its extreme limitations. The introduction of spacing between slots also increases the power density.
Article
Green & Sustainable Science & Technology
Chin-Hsiang Cheng, Yi-Han Tan, Tzu-Sung Liu
Summary: This research developed a numerical model for a double-acting four-cylinder alpha-type Stirling engine, combining thermodynamic and dynamic models to study its performance. Experimental results showed that under specific temperature, pressure, and torque conditions, the engine can achieve a certain shaft power. The model can also validate and further simulate the thermal properties and transient behavior of the engine.
Article
Thermodynamics
Chin-Hsiang Cheng, Hang-Suin Yang, Yi-Han Tan
Summary: This paper proposes an energy method to solve the relationship between the crank angle of the main shaft and the work generated by the working fluid in a double-acting Stirling engine with a wobble yoke mechanism. The study also employs a modified non-ideal adiabatic model to predict the transient variation in thermal properties of the working fluid. The simulation results demonstrate the potential of the proposed engine in terms of maximum shaft power and performance prediction.
Article
Thermodynamics
Hang-Suin Yang, Chin-Hsiang Cheng, Muhammad Aon Ali
Summary: This study proposes a theoretical model for analyzing the performance and operating modes of a thermal-lag Stirling engine. The model is solved by the method of multiple scales, and it predicts the performance, operating regions, and transitions between different modes. The performance of the engine under stable operating state and the dependence of the indicated power on engine speed are evaluated. An optimal loading and a minimum operating speed are also predicted.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Chin-Hsiang Cheng, Yu-Ting Lin
Summary: This study aimed to develop an algorithm for the computational optimization of free-piston Stirling engines. The algorithm includes an optimization method and compatible strategies, which can handle multiple-parameter optimization and provide faster convergence.
Article
Engineering, Manufacturing
Chin-Hsiang Cheng, Cherng-Chyi Loh, Yi-Jie Zhang
Summary: This study uses a composite material with copper powder added in Polylactide (PLA) to manufacture metallic parts via 3D printing, and sintering process is applied for PLA removal and mechanical strengthening. Numerical simulation is conducted to investigate the heat transfer characteristics of the system during heating process.
PROGRESS IN ADDITIVE MANUFACTURING
(2022)
Article
Chemistry, Physical
Chin-Hsiang Cheng, Yi-Shen Chen, Hsin-Yu Tsai, Yu-Ling Liang, David T. W. Lin, Yitung Chen
Summary: The present study aims to develop and test a cost-effective and efficient printing method for fabricating flexible metamaterial film with high electromagnetic wave absorptivity. Numerical and experimental results show that the flexible metamaterial film fabricated using a silver nanoparticles ink jet printer has a high absorptivity.
Article
Energy & Fuels
Chin-Hsiang Cheng, Duc-Thuan Phung
Summary: Thermal-lag engines are external combustion engines with a single moving piston, resulting in lower manufacturing and maintenance costs. This study focuses on the performance of thermal-lag engines by developing a three-dimensional computational fluid dynamics model and validating it with experimental data. The study finds that the CFD model's predictions align well with the experimental data and highlights the significant impact of engine speed and temperature on engine power.
Article
Energy & Fuels
Chin-Hsiang Cheng, Surender Dhanasekaran
Summary: This research focuses on reducing the cogging force acting on the translator of a slot-spaced Permanent Magnet Linear Alternator (PMLA) by making geometrical changes to the machine structure. The aim is to align the cogging force profile with the displacement profile of the translator to minimize vibrations and prevent damage to the piston of the Free Piston Stirling Engine (FPSE). The outcome of this work is achieving a balance between reduced voltage and cogging force through minor geometrical changes and a sinusoidal cogging force profile.
Article
Energy & Fuels
Chin-Hsiang Cheng, Shang-Ting Huang
Summary: This study aims to model a hybrid power system that can continuously generate power by switching between solar radiation and combustion energy from synthesis gases. The system includes a hybrid energy receiver, solar dish, Stirling generator, fluidized-bed gasifier, boiler, and water tank. The modeling results indicate that switching can result in a continuous power output ranging from 600 to 1200 W.
ENERGY SCIENCE & ENGINEERING
(2023)
Article
Thermodynamics
Jhen-Syuan Huang, Chin-Hsiang Cheng
Summary: This paper presents a theoretical model for analyzing the performance of a rotary-integral Stirling cryocooler. Transient variations of thermodynamic properties are used to predict cooling temperature and capacity. A precise evaluation method for the regenerator is introduced, and temperature and pressure dependent thermophysical properties are considered. An experimental prototype is manufactured and numerical results from the model are validated. The results show good agreement between the predicted and measured values, indicating the effectiveness of the proposed model. Parametric studies are also conducted to explore performance enhancements.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Energy & Fuels
Chin-Hsiang Cheng, Surender Dhanasekaran
Summary: This research focuses on the design and development of a tubular slot-spaced Permanent Magnet Linear Alternator coupled with Free-Piston Stirling Engines. By studying parameters, the power density of the machine has been increased, and the performance variation of the machine under different conditions has been studied.
Article
Green & Sustainable Science & Technology
Cameron Bracken, Nathalie Voisin, Casey D. Burleyson, Allison M. Campbell, Z. Jason Hou, Daniel Broman
Summary: This study presents a methodology and dataset for examining compound wind and solar energy droughts, as well as the first standardized benchmark of energy droughts across the Continental United States (CONUS) for a 2020 infrastructure. The results show that compound wind and solar droughts have distinct spatial and temporal patterns across the CONUS, and the characteristics of energy droughts are regional. The study also finds that compound high load events occur more often during compound wind and solar droughts than expected.
Article
Green & Sustainable Science & Technology
Ning Zhang, Yanghao Yu, Jiawei Wu, Ershun Du, Shuming Zhang, Jinyu Xiao
Summary: This paper provides insights into the optimal configuration of CSP plants with different penetrations of wind power by proposing an unconstrained optimization model. The results suggest that large solar multiples and TES are preferred in order to maximize profit, especially when combined with high penetrations of wind and photovoltaic plants. Additionally, the study demonstrates the economy and feasibility of installing electric heaters (EH) in CSP plants, which show a linear correlation with the penetration of variable energy resources.
Article
Green & Sustainable Science & Technology
M. Szubel, K. Papis-Fraczek, S. Podlasek
Article
Green & Sustainable Science & Technology
J. Silva, J. C. Goncalves, C. Rocha, J. Vilaca, L. M. Madeira
Summary: This study investigated the methanation of CO2 in biogas and compared two different methanation reactors. The results showed that the cooled reactor without CO2 separation achieved a CO2 conversion rate of 91.8%, while the adiabatic reactors achieved conversion rates of 59.6% and 67.2%, resulting in an overall conversion rate of 93.0%. Economic analysis revealed negative net present worth values, indicating the need for government monetary incentives.
Article
Green & Sustainable Science & Technology
Yang Liu, Yonglan Xi, Xiaomei Ye, Yingpeng Zhang, Chengcheng Wang, Zhaoyan Jia, Chunhui Cao, Ting Han, Jing Du, Xiangping Kong, Zhongbing Chen
Summary: This study investigated the effect of using nanofiber membrane composites containing Prussian blue-like compound nanoparticles (PNPs) to relieve ammonia nitrogen inhibition of rural organic household waste during high-solid anaerobic digestion and increase methane production. The results showed that adding NMCs with 15% PNPs can lower the concentrations of volatile fatty acids and ammonia nitrogen, and increase methane yield.
Article
Green & Sustainable Science & Technology
Zhong Ge, Xiaodong Wang, Jian Li, Jian Xu, Jianbin Xie, Zhiyong Xie, Ruiqu Ma
Summary: This study evaluates the thermodynamic, exergy, and economic performance of a double-stage organic flash cycle (DOFC) using ten eco-friendly hydrofluoroolefins. The influences of key parameters on performance are analyzed, and the advantages of DOFC over single-stage type are quantified.
Article
Green & Sustainable Science & Technology
Nicolas Kirchner-Bossi, Fernando Porte-Agel
Summary: This study investigates the optimization of power density in wind farms and its sensitivity to the available area size. A novel genetic algorithm (PDGA) is introduced to optimize power density and turbine layout. The results show that the PDGA-driven solutions significantly reduce the levelized cost of energy (LCOE) compared to the default layout, and exhibit a convex relationship between area and LCOE or power density.
Article
Green & Sustainable Science & Technology
Chunxiao Zhang, Dongdong Li, Lin Wang, Qingpo Yang, Yutao Guo, Wei Zhang, Chao Shen, Jihong Pu
Summary: In this study, a novel reversible liquid-filled energy-saving window that effectively regulates indoor solar radiation heat gain is proposed. Experimental results show that this window can effectively reduce indoor temperature during both summer and winter seasons, while having minimal impact on indoor illuminance.
Article
Green & Sustainable Science & Technology
Alessandro L. Aguiar, Martinho Marta-Almeida, Mauro Cirano, Janini Pereira, Leticia Cotrim da Cunha
Summary: This study analyzed the Brazilian Equatorial Shelf using a high-resolution ocean model and found significant tidal variations in the area. Several hypothetical barrages were proposed with higher annual power generation than existing barrages. The study also evaluated the installation effort of these barrages.
Article
Green & Sustainable Science & Technology
Francesco Superchi, Nathan Giovannini, Antonis Moustakis, George Pechlivanoglou, Alessandro Bianchini
Summary: This study focuses on the optimization of a hybrid power station on the Tilos island in Greece, aiming to increase energy export and revenue by optimizing energy fluxes. Different scenarios are proposed to examine the impact of different agreements with the grid operator on the optimal solution.
Article
Green & Sustainable Science & Technology
Peimaneh Shirazi, Amirmohammad Behzadi, Pouria Ahmadi, Sasan Sadrizadeh
Summary: This research presents two novel energy production/storage/usage systems to reduce energy consumption and environmental effects in buildings. A biomass-fired model and a solar-driven system integrated with photovoltaic thermal (PVT) panels and a heat pump were designed and assessed. The results indicate that the solar-based system has an acceptable energy cost and the PVT-based system with a heat pump is environmentally superior. The biomass-fired system shows excellent efficiency.
Article
Green & Sustainable Science & Technology
Zihao Qi, Yingling Cai, Yunxiang Cui
Summary: This study aims to investigate the operational characteristics of the solar-ground source heat pump system (SGSHPS) in Shanghai under different operation modes. It concludes that tandem operation mode 1 is the optimal mode for winter operation in terms of energy efficiency.
Article
Green & Sustainable Science & Technology
L. Bartolucci, S. Cordiner, A. Di Carlo, A. Gallifuoco, P. Mele, V. Mulone
Summary: Spent coffee grounds are a valuable biogenic waste that can be used as a source of biofuels and valuable chemicals through pyrolysis and solvent extraction processes. The study found that heavy organic bio-oil derived from coffee grounds can be used as a carbon-rich biofuel, while solvent extraction can extract xantines and p-benzoquinone, which are important chemicals for various industries. The results highlight the promising potential of solvent extraction in improving the economic viability of coffee grounds pyrolysis-based biorefineries.
Article
Green & Sustainable Science & Technology
Luiza de Queiroz Correa, Diego Bagnis, Pedro Rabelo Melo Franco, Esly Ferreira da Costa Junior, Andrea Oliveira Souza da Costa
Summary: Building-integrated photovoltaics, especially organic solar technology, are important for reducing greenhouse gas emissions in the building sector. This study analyzed the performance of organic panels laminated in glass in a vertical installation in Latin America. Results showed that glass lamination and vertical orientation preserved the panels' performance and led to higher energy generation in winter.
Article
Green & Sustainable Science & Technology
Zhipei Hu, Shuo Jiang, Zhigao Sun, Jun Li
Summary: This study proposes innovative fin arrangements to enhance the thermal performance of latent heat storage units. Through optimization of fin distribution and prediction of transient melting behaviors, it is found that fin structures significantly influence heat transfer characteristics and melting behaviors.
