Article
Engineering, Chemical
Kun Xi, Xiang Zhao, Zhihui Xie, Fankai Meng, Zhuoqun Lu, Xiangkun Ji
Summary: In this study, a novel PCHE channel structure with staggered NACA 0025 airfoil-shaped fins was proposed, and its thermal-hydraulic characteristics were investigated using carbon dioxide as the working fluid. The results showed that the thermal-hydraulic performance of the PCHE under the trans-critical operating condition was better than that under the near-critical and far-critical operating conditions. Compared with conventional airfoil fin channels, the novel channel achieved comparable comprehensive performance with 50% reduction in fin volume, leading to a more lightweight PCHE design. These findings provide theoretical support for the design and optimization of airfoil fin PCHEs.
Article
Thermodynamics
Yunlong Zhou, Dandan Yin, Xintian Guo, Cunlin Dong
Summary: The study indicates that CO2/propane mixtures as heat transfer fluids exhibit lower pressure loss and higher heat transfer coefficients. The increase in propane molar fraction decreases the fanning friction factor and increases the Nusselt number.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
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
Haitao Hu, Jianrui Li, Yao Xie, Yongdong Chen
Summary: Experimental investigation on two-phase flow boiling in zigzag channels of PCHE reveals that heat transfer coefficient increases with vapor quality initially and then decreases, peaking at vapor quality of 0.85 to 0.9. Additionally, the heat transfer coefficient is intensified with decreasing saturation pressure.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
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
Energy & Fuels
Jun-Yu Xie, Chih-Che Chueh, Wei-Hsin Chen, Kai-Jen Chen
Summary: This study investigated three different designs of flow channels in a printed circuit heat exchanger (PCHE) and validated their performance in efficiency and pressure drop through numerical simulations and experimental data. The results showed a significant improvement in heat transfer efficiency and pressure drop when using PCHE with zigzag flow channels, making it suitable for waste heat recovery systems in Organic Rankine Cycle (ORC).
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Thermodynamics
Sungkun Chung, Su Won Lee, Namhyeong Kim, Seong Min Shin, Moo Hwan Kim, HangJin Jo
Summary: This study investigates the thermal-hydraulic performances of straight and airfoil channels of printed-circuit heat exchanger (PCHE) for a nitrogen Brayton cycle recuperator. The results show that the airfoil PCHE has higher heat transfer performance and pressure drop compared to the straight PCHE. New correlations are developed to predict the experimental data for the airfoil PCHE. The comprehensive performance of the airfoil PCHE is found to be the highest among different channel configurations.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Zirui Xu, Wangnan Chen, Jie Lian, Xiongwei Yang, Qiuwang Wang, Yitung Chen, Ting Ma
Summary: In this study, a simplified mechanical stress analysis method for PCHE was proposed to improve its safety under high pressure operation. By optimizing the channel shape, the mechanical stress of PCHE can be reduced, leading to a more compact design and safe operation.
Article
Thermodynamics
Behzad Ahmadi, Sajjad Bigham
Summary: Polymer heat exchangers are cost-effective and lightweight thermal management solutions with antifouling and anti-corrosion properties, but suffer from poor thermal characteristics due to low thermal conductivities. This study examines the thermal performance of 3D-printed polymer heat exchangers with intricate internal geometries, including a lung-inspired design, across a range of thermal conductivities. Experimentally and numerically, it was determined that high thermal conductivity lung-inspired polymer heat exchangers offer high thermal duties at reduced pressure drops and high effectiveness.
APPLIED THERMAL ENGINEERING
(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
Jia Tang, Minyun Liu, Yanping Huang, Guangxu Liu, Jinguang Zang, Shenghui Liu
Summary: This study analyzes the effect of manufacturing deviations on the thermohydraulic performance of printed circuit heat exchangers (PCHEs) and proposes a model to estimate the relative deviation of the channel hydraulic diameter after bonding. The results show that etching-induced deformations have a relatively small impact on performance, while the channel cross-section shape and longitudinal pitch have a more significant influence. The deformation of channels after diffusion bonding can cause large deviations in thermal-hydraulic characteristics.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Jie Lian, Dongjun Xu, Hongliang Chang, Zirui Xu, Xing Lu, Qiuwang Wang, Ting Ma
Summary: A diffusion-bonded hybrid printed circuit heat exchanger is proposed as a precooler for the supercritical carbon dioxide Brayton cycle, with chemical-etching channels for the CO2 side and plate-fin channels for the water side. The hybrid heat exchanger significantly improves heat transfer performance, reducing core volume by 49% and increasing heat transfer rate per unit volume by 145%. Mechanical stress requirements are met in both channels of the optimized hybrid heat exchanger.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Environmental Sciences
Lei Liu, Aihua Yan, Qiuxiang Shi, Xi Xiao, Chenbing Zhu, Xuelong Yang
Summary: Printed Circuit Heat Exchangers (PCHEs) are a great alternative to the main cryogenic heat exchanger in Floating Liquefied Natural Gas (FLNG) facilities due to their compact structure and strong heat transfer performance. This paper numerically studied the thermal-hydraulic characteristics of PCHEs with different channel types and found that wavy channels, especially the trapezoidal channel, can improve heat transfer performance. However, the bends of the wavy channels also cause local friction losses. Comparing different channel types, the benefit of heat transfer enhancement does not outweigh the penalty of flow deterioration.
Article
Thermodynamics
Jinghan Wang, Yangfan Ma, Ting Ma, Min Zeng, Qiuwang Wang
Summary: This paper proposes an application of PCHE to ADS and investigates its thermal performance. By optimizing structural and operating parameters, the thermal performance of PCHE is further improved. The results show that the high thermal conductivity and superior field synergy degree of LBE contribute to the enhancement of the overall heat transfer coefficient of PCHE. The structural and operating parameters of the helium side have a significant impact on the thermal-hydraulic performance.
Article
Materials Science, Multidisciplinary
Dong-Ha Kim, Sunghwan Yeo, Jun-Hwan Kim, In-Jin Sah, Jong-Bae Hwang, Sang-ji Kim, Young-Kook Lee
Summary: Thermal creep tests were conducted on diffusion-welded Alloy 800H tubes at 700 ? under various hoop stresses. The acquired creep strain data do not match well with the reference creep data of the Alloy 800H, which requires further work to explain the whole details. The current study points to the requirement for a better diffusion welding process for Alloy 800H for use in printed circuit heat exchangers and steam generators.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Energy & Fuels
Muhammed Saeed, Khaled Alawadi, Sung Chul Kim
Summary: The study assessed the impact of different effectiveness, Reynolds number, and channel configurations of heat exchanger designs on the overall performance of sCO2-BC system.
Article
Green & Sustainable Science & Technology
M. Salman Siddiqui, Muhammad Hamza Khalid, Rizwan Zahoor, Fahad Sarfraz Butt, Muhammed Saeed, Abdul Waheed Badar
Summary: This study investigates the performance of vertical-axis wind turbines (VAWT) under different levels of turbulent intensity (TI) and ground clearance, revealing that a ground clearance of 7:5c yields higher and more consistent performance. The results show a decrease in performance of up to 45:42% at a 25% TI level.
Article
Thermodynamics
Muhammed Saeed, Ahmad Ali Awais, Abdallah S. Berrouk
Summary: The study suggests that choosing smaller design point values for CO2 channel mass flow rates can significantly reduce pressure losses, but may result in undesirable temperature profiles; higher channel mass flow rates can avoid pinch points in the precooler, but lead to compact designs with poor hydraulic performance; using a sandwiched channel configuration can substantially improve the hydraulic performance of the cold side without affecting the thermal characteristics of the precooler.
ENERGY CONVERSION AND MANAGEMENT
(2021)
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
Chemistry, Physical
Muhammed Saeed, Abdallah S. Berrouk, Mohamed S. AlShehhi, Yasser F. AlWahedi
Summary: This study examines the potential of using supercritical carbon dioxide (sCO2) as a coolant for microchannel heat sinks (MCHS) and designs a header geometry to minimize flow maldistribution. Through numerical simulations and experiments, it is found that using sCO2 can improve the thermal efficiency of the heat sink and reduce pressure losses compared to traditional liquid coolants.
JOURNAL OF SUPERCRITICAL FLUIDS
(2021)
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
Energy & Fuels
Munendra Pal Singh, Abdallah Sofiane Berrouk, Muhammad Saeed
Summary: This study conducts node sensitivity analysis on the thermal-hydraulic performance of supercritical fluid in a three parallel channel configuration system. By dividing the heated channel into different nodes and examining it under various operating conditions, the nonlinear characteristics of the system were obtained. This analysis can contribute to the improvement of heat and mass transfer in designing efficient heated channel systems.
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
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)
