Article
Thermodynamics
Xin Sui, Hugh Russell, Hal Gurgenci, Sangkyoung Lee, Zhiqiang Guan, Peixin Dong
Summary: This paper presents a one-dimensional numerical modelling methodology for Printed Circuit Heat Exchangers (PCHEs) in supercritical CO2 power cycles. The methodology can simulate the steady, off-design, and transient behavior of PCHEs and has been validated against experimental results. The proposed model successfully captures the time-varying temperature changes of working fluids in different scenarios.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Yiming Wang, Gongnan Xie, Huaitao Zhu, Han Yuan
Summary: This study constructed an ammonia absorption-reheat supercritical carbon dioxide Brayton combined cycle and analyzed its thermodynamic performance. The optimized combined cycle achieved high energy and exergy efficiencies under controlled freezing-point storage condition and air-conditioning refrigeration condition.
Article
Thermodynamics
Xiang Wan, Kun Wang, Cheng-Ming Zhang, Tie-Chen Zhang, Chun-Hua Min
Summary: An integrated model of solar power tower coupling with the Brayton power cycle is developed, and the particle swarm optimization algorithm is utilized to search for optimal operation parameters and control schemes under off-design conditions with different ambient temperatures. The proposed control schemes improve power cycle efficiency and save total power output in low ambient temperature, while controlling losses in a small range in high ambient temperature.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Michael Deligant, Moritz Huebel, Tchable-Nan Djaname, Florent Ravelet, Mathieu Specklin, Mohamed Kebdani
Summary: This paper discusses the design and system simulation of Concentrated Solar Power (CSP) plants, with a focus on the performance prediction of the radial turbine expander. The study finds that adjusting the rotational speed and inlet guide vane angle can improve the system's performance under different load conditions.
Article
Thermodynamics
Yadong Du, Ce Yang, Zhiyi Yu, Wenrui Bao, Chenxing Hu, Xinyu He
Summary: This study investigates the integrated design and off-design control strategies of the supercritical CO2 recompression cycle in a small-scale lead-cooled fast reactor. The results provide theoretical guidance for the selection of off-design control strategies for the supercritical CO2 recompression cycles applied in various energy fields.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Jian Wang, Xinping Yan, Mingjian Lu, Yuwei Sun, Jiawei Wang
Summary: This study compared the finite element method (FEM) with the method from ASME codes to assess the structural strength of Printed Circuit Heat Exchangers (PCHEs) in the supercritical carbon dioxide (S-CO2) Brayton cycle. The effects of temperature and pressure on PCHEs were analyzed and the main factors affecting its strength were discussed. The results showed that the highest stress of PCHEs occurred at the middle of the semicircular arc of the channel under design conditions.
JOURNAL OF THERMAL SCIENCE
(2022)
Article
Thermodynamics
Yadong Du, Ce Yang, Haimei Wang, Chenxing Hu
Summary: This study verified the accuracy of a one-dimensional design and analysis model against experimental data, highlighting the importance of optimizing the centrifugal compressor in the supercritical carbon dioxide Brayton cycle. It was found that the system's off-design efficiency is influenced by climate change, and strategies such as increasing compressor inlet pressure and raising speed can improve system performance.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Jiancong Chen, Lijun Liu, Gaoliang Liao, Feng Zhang, E. Jiaqiang, Si Tan
Summary: This paper proposes a method for analyzing the off-design performance of supercritical CO2 cycles based on thermal source fluctuations. The thermodynamic performance and economic viability of four types of supercritical CO2 cycles were optimized, and the off-design performance of these cycles was investigated. The results indicate that the reduction in gas flow rate has a greater impact on cycle performance than the decrease in gas temperature.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Dora Villada-Castillo, Guillermo Valencia-Ochoa, Jorge Duarte-Forero
Summary: The present study focused on analyzing a new geometrical modification of the conventional zig-zag channel for Printed Circuit Heat Exchangers. Using OpenFOAM and Salome software, three types of channel geometries were defined and compared. The results showed that the modified zig-zag channel achieved better thermal hydraulic performance and reduced power consumption by 1.5% compared to the conventional zig-zag channel. The modified zig-zag channel also achieved a higher efficiency and reduced operating costs by 20.9%.
Article
Thermodynamics
Andrew Lock, Viv Bone
Summary: This study investigates the off-design performance of the supercritical CO2 recompression cycle and presents effective operating strategies to enhance its performance and flexibility.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Qian Li, Qi Zhan, Shipeng Yu, Jianchuang Sun, Weihua Cai
Summary: In this study, a machine learning approach was used to predict the thermal-hydraulic performance of supercritical methane flow in a printed circuit heat exchanger (PCHE). Data of 6213 micro segments obtained from numerical simulations were employed, and four machine learning models were used to predict local heat transfer coefficient and unit pressure drop. The results showed that the artificial neural network (ANN) model can achieve higher accuracy in predicting these parameters.
Article
Thermodynamics
Bo Li, Shun-sen Wang, Yaobo Xu, Liming Song
Summary: The off-design performance of a partial heating carbon dioxide power cycle driven by the waste heat of a gas turbine was quantitatively analyzed. The results showed that both the net power output and system exergy efficiency are influenced by changes in flue gas parameters and ambient temperature. It was found that regulating the cycle maximum pressure is important in response to variations in flue gas parameters, while adjusting the cycle minimum pressure is crucial in response to changes in ambient temperature.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Morteza Khoshvaght-Aliabadi, Parvaneh Ghodrati, Hamed Mortazavi, Yong Tae Kang
Summary: This study investigates the performance of non-uniform wavy minichannels using supercritical carbon dioxide as the working fluid. The results show that the proposed structures for the wavy minichannels can increase the heat transfer coefficient under the given operating conditions. Replacing the conventional wavy minichannel with shorter wavelengths at the upstream significantly enhances the heat transfer in both cooling and heating modes.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Yongju Jeong, Seong Kuk Cho, In Woo Son, Jeong Ik Lee
Summary: The prediction of off-design performance in S-CO2 cycle compressor is an important issue for load following operation. A compressor performance map generated at the design conditions is commonly used to predict off-design performance under specific inlet conditions. However, the validity of similitude models for S-CO2 compressors has not been experimentally confirmed. By comparing and validating various similitude models using data from existing S-CO2 test facilities, it is found that most models predict better with enthalpy rise rather than pressure ratio. Among the compared models, the IGZ model based on the ideal gas model shows the best prediction for the compressor's enthalpy rise at different inlet conditions.
Article
Thermodynamics
Lei Qi, Jingnan Dong, Wenpeng Hong, Mingtian Wang, Tao Lu
Summary: A cycle calculation model of a rotating detonation gas turbine was established based on the component characteristic curves of a single shaft gas turbine. The results showed that the rotating detonation gas turbine had higher cycle performance and lower compressor pressure ratio compared to traditional gas turbines. Sensitivity analysis revealed that turbine efficiency had the most significant effect on cycle efficiency increment under the calculated conditions.
Article
Energy & Fuels
Muhammad Salman Siddiqui, Muhammad Hamza Khalid, Abdul Waheed Badar, Muhammed Saeed, Taimoor Asim
Summary: This study focuses on simulating the flow past a small-scale HAWT and evaluating the effects of varying geometric and numerical configurations. The research finds that high fidelity simulations may result in performance deterioration when reducing geometric or numerical complexity.
Article
Thermodynamics
Muhammad Saeed, Man-Hoe Kim
Summary: A new cycle layout for supercritical carbon dioxide was proposed and analyzed in this study, showing better integration capabilities with heat sources and higher efficiency. The proposed cycle's configuration exhibited better integration capabilities than other cycle layouts and contributed to cost-effective power generation.
Article
Thermodynamics
Qazi Shahzad Ali, Man-Hoe Kim
Summary: This work provides an in-depth design analysis of full-scale airborne wind energy systems, focusing on the impact of an airfoil-based shell carrying a 3-bladed rotor tailored to airborne needs. High-fidelity numerical simulations reveal that the shell configuration enhances power output and outperforms the Betz limit. The net extracted power of the proposed design is significantly higher than that of a bare rotor, with the shell rotor operating similarly to the bare rotor at higher tip speed ratios.
Article
Green & Sustainable Science & Technology
Qazi Shahzad Ali, Man-Hoe Kim
Summary: This study systematically analyzed the power conversion performance of an airborne wind turbine using time-resolved air loads, finding that the shell configuration yields 64% more power output compared to the bare configuration. However, cyclic fluctuations significantly undermine the continuous production of power under skewed flow conditions.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Nuclear Science & Technology
Munendra Pal Singh, Muhammad Saeed, Abdallah Sofiane Berrouk
Summary: This study investigates the non-linear dynamics of a supercritical water reactor (SCWR) with a parallel channel configuration, focusing on the bifurcation characteristics associated with density wave oscillations. By conducting numerical simulations and parametric sensitivity analysis, the existence and nature of limit cycle behavior related to these bifurcations are confirmed.
PROGRESS IN NUCLEAR ENERGY
(2022)
Article
Energy & Fuels
Arslan Saleem, Muhammad Saeed, Man-Hoe Kim
Summary: This paper presents a study on the modeling of heat and moisture transfer in a clothes-conditioning unit. A computational model using a multicomponent, non-reacting, two-phase Eulerian-Eulerian model was developed. The clothes were modeled as porous towels of uniform thickness. The impact of design parameters on the mass flow distribution inside the unit was studied, and an optimal design configuration was determined using response surface analysis and a multiobjective genetic algorithm.
Article
Thermodynamics
Muhammad Saeed, Abdallah S. Berrouk, Yasser F. Al Wahedi, Munendra Pal Singh, Ibragim Abu Dagga, Imran Afgan
Summary: This study focuses on enhancing the overall thermo-hydraulic performance of a C-shaped printed circuit heat exchanger using Machine Learning algorithms. The results demonstrate the effectiveness of the optimized solution through comparison with other geometries.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Fares Alawwa, Muhammed Saeed, Rami Homsi, Huaitao Zhu, Abdallah S. Berrouk, Mohamad Khalil, Gongnan Xie, Yasser Al Wahedi
Summary: Additive manufacturing technology enables the fabrication of intricate geometries at high accuracy, making it attractive for 3D-printed heatsinks. Current research focuses on exploring the potential of periodic lattices of cellular materials as heat sinks and comparing them with conventional thermal management systems. Numerical simulations show that the performance of 3D-printed heatsinks is significantly superior to traditional designs, making them an ideal candidate for designing compact and efficient heat removal systems for electronic devices.
APPLIED THERMAL ENGINEERING
(2023)
Review
Engineering, Chemical
Munendra Pal Singh, Ahmed Mongy Alatyar, Abdallah Sofiane Berrouk, Muhammad Saeed
Summary: This paper reviews the application of rotating packed beds (RPBs) in the CO2 capture process and discusses their geometric designs, hydrodynamic characteristics, performance parameters, and their effects on CO2 removal efficiency. Additionally, the latest experimental studies in the absorption and adsorption domains are summarized, and recommendations are given to support the use of RPBs in various industrial and commercial CO2 removal applications.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Ahmed M. Alatyar, Abdallah S. Berrouk, Mohamed S. Alshehhi, Muhammed Saeed, Haitem Hassan-Beck, Krishnaswamy Nandakumar
Summary: The current study aims to enhance the hydraulic performance of Rotating Packed Beds (RPB) by modifying the geometrical construction of the inner cavity, outlet pipe, and packing. Four novel geometries of the RPB were proposed and analyzed using a validated CFD model, and it was found that optimizing the flow pattern at the exit of the packing by modifying the inner cavity's shape can reduce the total pressure drops by up to 22%. The addition of a nozzle at the entry of the outlet pipe further decreases the pressure drop by 13%.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Muhammad Sadiq, Muhammed Saeed, Toufic Mezher, Mutasem El Fadel, Ahmad T. Mayyas
Summary: Hydrogen fueling standards require a sustainable cooling system, and this study compares double tube heat exchangers (DTHE) and microchannel heat exchangers (MCHE) in terms of thermal and hydraulic performance and cost. The MCHE outperforms the DTHE in mass production setups and has predicted cost reductions. This switch also leads to significant material and waste savings.
ENERGY CONVERSION AND MANAGEMENT-X
(2023)
Article
Multidisciplinary Sciences
Muhammed Saeed, Ramanzani S. S. Kalule, Abdallah S. S. Berrouk, Mohamed Alshehhi, Eydhah Almatrafi
Summary: The research focuses on enhancing the thermohydraulic performance of a compact mini-channel heat removal system by using a machine learning-based optimization technique. Different fin configurations are evaluated using simulations, and the data is used to train regression models to accurately predict heat transfer coefficient and pressure drop. The selected machine learning model, along with a genetic algorithm, is used to find the optimal heat sink geometry. The optimized channel geometry shows a significant improvement in performance compared to the best available configuration in terms of heat transfer coefficient and pressure drop.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Naveed Ullah, Shehryar Ishaque, Man-Hoe Kim, Sanghun Choi
Summary: This study focuses on developing and optimizing a microchannel gas cooler model for evaluating the performance of a transcritical CO2 mobile air-conditioning system. The developed model shows reliable prediction capabilities for gas cooler capacity and pressure drop. A parametric optimization method is applied to obtain optimal heat exchanger dimensions, resulting in a reduction of pressure drop.
Article
Thermodynamics
Pengcheng Zhao, Jingang Wang, Liming Sun, Yun Li, Haiting Xia, Wei He
Summary: The production of green hydrogen through water electrolysis is crucial for renewable energy utilization and decarbonization. This research explores the optimal electrode configuration and system design of compactly-assembled industrial electrolyzer. The findings provide valuable insights for industrial application of water electrolysis equipment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
V. Baiju, P. Abhishek, S. Harikrishnan
Summary: Thermally driven adsorption desalination systems (ADS) have gained attention as an eco-friendly solution for water scarcity. However, they face challenges related to low water productivity and scalability. To overcome these challenges, integrating ADS with other desalination technologies can create a small-scale hybrid system. This study proposes integrating ADS with a Thermo Electric Dehumidification (TED) unit to enhance its performance.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
C. X. He, Y. H. Liu, X. Y. Huang, S. B. Wan, Q. Chen, J. Sun, T. S. Zhao
Summary: A decentralized centroid multi-path RC network model is constructed to improve the temperature prediction accuracy compared to traditional RC models. By incorporating multiple heat flow paths and decentralizing thermal capacity, a more accurate prediction is achieved.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chaoying Li, Meng Wang, Nana Li, Di Gu, Chao Yan, Dandan Yuan, Hong Jiang, Baohui Wang, Xirui Wang
Summary: There is an urgent need to shift away from heavy dependence on fossil fuels and embrace renewable energy sources, particularly in the energy-intensive oil refining process. This study presents an innovative concept called the Solar Oil Refinery, which applies solar energy in oil refining. A solar multi-energies-driven hybrid chemical oil refining system that utilizes solar pyrolysis and electrolysis has been developed, significantly improving solar utilization efficiency, cracking rate, and hydrogen yield.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chao Ma, Guanghui Wang, Dingbiao Wang, Xu Peng, Yushen Yang, Xinxin Liu, Chongrui Yang, Jiaheng Chen
Summary: This study proposes a bio-inspired fish-tail wind rotor to improve the wind power efficiency of the traditional Savonius rotor. Through transient simulations and orthogonal experiments, the key factors affecting the performance are identified. A response surface model is constructed to optimize the power coefficient, resulting in an improvement of 9.4% and 6.6% compared to the Savonius rotor.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sina Bahmanziari, Abbas-Ali Zamani
Summary: This paper proposes a new framework for improving electrical energy harvesting from piezoelectric smart tiles through a combination of magnetic plucking, mechanical impact, and mechanical vibration force mechanisms. Experimental results demonstrate a significant increase in energy yield and average energy harvesting time compared to other mechanisms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Nanjiang Dong, Tao Zhang, Rui Wang
Summary: This study establishes a multiobjective mixed-variable configuration optimization model for a comprehensive combined cooling, heating, and power energy system, and proposes an efficient generating operator to optimize this model. The experimental results show that the proposed algorithm performs better than other state-of-the-art algorithms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Ahmed E. Mansy, Eman A. El Desouky, Tarek H. Taha, M. A. Abu-Saied, Hamada El-Gendi, Ranya A. Amer, Zhen-Yu Tian
Summary: This study aims to convert office paper waste into bioethanol through a sustainable pathway. The results show that physiochemical and enzymatic hydrolysis of the waste can yield a high glucose concentration. The optimal conditions were determined using the Box-Behnken design, and a blended membrane was used for ethanol purification.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sven Klute, Marcus Budt, Mathias van Beek, Christian Doetsch
Summary: Heat pumps are crucial for decarbonizing heat supply, and steam generating heat pumps have the potential to decarbonize the industrial sector. This paper presents the current state, technical and economic data, and modeling principles of steam generating heat pumps.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Le Zhang, To-Hung Tsui, Yen Wah Tong, Pruk Aggarangsi, Ronghou Liu
Summary: This study investigates the effectiveness of a current-carrying-coil-based magnetic field in promoting anaerobic digestion of chicken manure. The results show that the applied magnetic field increases methane yield, decreases carbon dioxide production, and reduces the concentration of ammonia nitrogen. Microbial community analysis reveals the enrichment of certain methanogenic genera and enhanced metabolic pathways. Pilot-scale experiments confirm the technical effectiveness of the magnetic field assistance in enhancing anaerobic digestion of chicken manure.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Bo Chen, Ruiqing Ma, Yang Zhou, Rui Ma, Wentao Jiang, Fan Yang
Summary: This paper presents an advanced energy management strategy for fuel cell hybrid electric heavy-duty vehicles, focusing on speed planning and energy allocation. By utilizing predictive co-optimization control, this strategy ensures safe inter-vehicle distance and minimizes energy demand. Simulation results demonstrate the effectiveness of the proposed method in reducing fuel cell degradation cost and overall operation cost.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Fabio Fatigati, Roberto Cipollone
Summary: Organic Rankine Cycle-based microcogeneration systems that use solar sources to generate electricity and hot water can help reduce CO2 emissions in residential energy-intensive sectors. The adoption of a recuperative heat exchanger in these systems improves efficiency, reduces thermal power requirements, and saves on electricity costs.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Lipeng He, Renwen Liu, Xuejin Liu, Xiaotian Zheng, Limin Zhang, Jieqiong Lin
Summary: This research proposes a piezoelectric-electromagnetic hybrid energy harvester (PEHEH) for low-frequency wave motion and self-sensing wave environment monitoring. The PEHEH shows promising power output and the ability to self-power and self-sense the wave environment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Shangling Chu, Yang Liu, Zipeng Xu, Heng Zhang, Haiping Chen, Dan Gao
Summary: This paper studies a distributed energy system integrated with solar and natural gas, analyzes the impact of different parameters on its energy utilization and emissions reduction, and obtains the optimal solution through an optimization algorithm. The results show that compared to traditional separation production systems, this integrated system achieves higher energy utilization and greater reduction in carbon emissions.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Qingpu Li, Yaqi Ding, Guangming Chen, Yongmei Xuan, Neng Gao, Nian Li, Xinyue Hao
Summary: This paper proposes and studies a piston-type thermally-driven pump with a structure similar to a linear compressor, aiming to eliminate the high-quality energy consumption of existing pumps and replace mechanical pumps. The coupling mechanism of working fluid flow and element dimension is analyzed based on force analysis, and experimental data analysis is used to determine the pump operation stroke. Theoretical simulation is conducted to analyze the correlation mechanism of the piston assembly. The research shows that the thermally-driven pump can greatly reduce power consumption and has potential for industrial applications.
ENERGY CONVERSION AND MANAGEMENT
(2024)