Article
Thermodynamics
Dong-Kwon Kim
Summary: The thermal performances of optimized finned annuli with various fin shapes were compared in this study. A thermal model based on volume averaging theory was developed for finned tube annuli. The results showed that straight-finned annuli had the best thermal performance, while branched fins were not ideal for the case of finned tube annuli.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Jun Gil Song, Jong Hui Lee, Il Seouk Park
Summary: This study proposed a novel heat-pipe-embedded heat sink to address the thermal conductivity issue in high specification electronic equipment used in naval combat systems. Experimental results showed that the new heat sink successfully reduced the maximum temperature of the heat source, leading to space, weight, cost, and energy savings in the combat management system.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Shang Mao, Tao Zhou, Dong Wei, Wenbin Liu, Yitong Zhang
Summary: This study numerically simulated the flow and heat transfer behavior of supercritical water in a horizontal double pipe with helical fins, revealing peak heat transfer coefficients under specific conditions. Factors affecting heat transfer performance include buoyancy, hot fluid temperature, mass flux, and shape factor.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Yixun Sun, Cedric Beguin, Philippe Causse, Brahim Benmokrane, Francois Trochu
Summary: Filling granular materials in empty channels with flowing fluids can enhance heat transfer, but the uniformity of wall temperature is often overlooked. This study numerically investigates the wall temperature uniformity in a pipe filled with ceramic beads and heated by air flow. The effect of various parameters on temperature uniformity is analyzed.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Do Huu-Quan, Ali Mohammad Rostami, Mozafar Shokri Rad, Mohsen Izadi, Ahmad Hajjar, Qingang Xiong
Summary: This study focused on the convective heat transfer characteristics inside novel double-pipe heat exchangers with flat inner pipes, and found that the effects of inner pipe geometry heavily depend on the Reynolds number. Using flat inner pipes with small aspect ratio is beneficial for overall heat transfer at low Reynolds numbers, while circular inner pipes outperform at high Reynolds numbers.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Imansyah Ibnu Hakim, Ragil Sukarno, Nandy Putra
Summary: This study investigates the utilization of a finned U-shaped heat pipe heat exchanger in a vertical configuration to reduce cooling and reheating energy in an HVAC system. Results show that the two-row U-shaped HPHE significantly affects precooling and reheating, enhancing the COP by 39.9% and reducing relative humidity by 21.6%.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Thermodynamics
Hyeonmin Jo, Duckjong Kim
Summary: This study experimentally examines the forced convective heat transfer inside graphene aerogel and discusses the effect of the aerogel microstructure on the heat and fluid flow characteristics. The results show that graphene aerogel has better convective heat transfer performance and suggests methods to improve heat and fluid flow inside the aerogel.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
W. Q. Li, K. Cao, Q. L. Song, P. F. Zhu, Y. Ba
Summary: Phase change materials (PCMs) are promising for heat storage and passive cooling due to their high latent heat and selectable phase-change temperature, but suffer from low thermal conductivity. In this study, a new enhancement regime for phase-change heat transfer and thermoelectric power was demonstrated by using PCM embedded with heat-pipe (HP) array. Results showed that adding HP array significantly enhanced the phase-change of PCM and reduced the wall temperature by 51°C compared to pure PCM. The small thermal resistance of HPs resulted in temperature gradients of less than 1.5°C and 2.5°C in the vertical and horizontal directions, respectively. While the thermoelectric power was nearly four times higher with a single HP compared to three HPs, the wall temperature increased by 20°C. PCM convection contributed to a 20°C decrease in wall temperature but reduced the thermoelectric power.
APPLIED THERMAL ENGINEERING
(2023)
Article
Construction & Building Technology
Yifan Wu, Hongli Sun, Mengfan Duan, Borong Lin, Hengxin Zhao
Summary: This study developed a novel radiant cooling terminal integrated with a heat exchanger and a flat heat pipe, achieving fast thermal response speed and excellent surface temperature uniformity. By separating sensible and latent heat transfer, a dehumidification-adjustable cooling method was proposed, effectively decoupling condensation prevention and cooling capacity issues, with forced convection further enhancing cooling performance.
BUILDING AND ENVIRONMENT
(2021)
Article
Thermodynamics
Shahab Bazri, Irfan Anjum Badruddin, Abdullah Yousuf Usmani, Saleem Anwar Khan, Sarfaraz Kamangar, Mohammad Sajad Naghavi, Abdul Rahman Mallah, Ali H. Abdelrazek
Summary: This paper numerically investigates the performance of a compact solar water heater using evacuated tube heat pipe solar collectors coupled with a latent heat storage tank. The study uses three phase change materials to model the system and analyzes the temperature and thickness variation during high solar radiation conditions. The research is validated through experimental verification.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Weisong Ling, Wei Zhou, Ruiliang Liu, Zheng Shen, Chengzhong Liu, Jiale Huang
Summary: A new interlaced microchannel condenser was designed for a loop heat pipe, with an effective heat transfer area 6.4 times larger than traditional parallel condensers. Experimental results showed shorter preparation and startup times for the interlaced loop heat pipe, along with lower evaporator temperature and temperature fluctuations with the use of the interlaced condenser.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Mingrui Sun, Lunxiang Zhang, Chengzhi Hu, Jiafei Zhao, Dawei Tang, Yongchen Song
Summary: Optimizing the pore structure of metal foam is considered a feasible approach for improving overall heat transfer performance. The study found that throat area could not effectively optimize heat transfer performance, but the area goodness factor j/f was higher than conventional Kelvin cells.
Article
Environmental Sciences
Amin Amiri Delouei, Hasan Sajjadi, Goodarz Ahmadi
Summary: This study introduces ultrasonic vibration technology as an active method to enhance the thermal performance of water-cooling systems. Experimental results show that the thermal performance of ultrasonic vibrations can be improved by reducing the airflow rate and increasing the ultrasonic power. In addition to heat transfer improvement, ultrasonic waves are widely used for cleaning heat exchangers. This technology could provide a practical way for developing high-performance nanofluids-based computer cooling systems.
Article
Thermodynamics
Ubade Kemerli, Kamil Kahveci
Summary: Metal foams are promising for enhancing thermal performance in heat exchangers, but limited heat dissipation in high porosity foams is a constraint. Adding fins can significantly improve heat transfer, but the enhancement becomes limited beyond a certain number of fins. The contribution of fins to heat transfer varies between 40-115% and 70-150% at different velocities, depending on porosity and effective thermal conductivity.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Engineering, Chemical
Zi Ding, Cong Qi, Tao Luo, Yuxing Wang, Jianglin Tu, Chengchao Wang
Summary: The study showed that TiO2-H2O nanofluids and corrugated pipes significantly improved the heat transfer efficiency of double-pipe heat exchangers.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Engineering, Manufacturing
Mohd Najib Ali Mokhtar, M. Z. Abdullah, Abdullah Aziz Saad, Fakhrozi Cheani
Summary: The study focused on the reliability of solder joints after the self-alignment phenomenon during reflow soldering, analyzing the joint quality of SnAg alloy solder joints with varying silver content. Mechanical reliability study results showed a decreasing trend in shear strength value with increasing misalignment offset. Statistical analysis revealed that solder type variation had an insignificant effect on the shear strength of the chip resistor. Fracture was found to occur partially in the termination metallization at the lower part of the chip resistor.
SOLDERING & SURFACE MOUNT TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Chong Hooi Lim, M. Z. Abdullah, I. Abdul Azid, C. Y. Khor, M. S. Abdul Aziz, M. H. H. Ishaik
Summary: This study investigates the heat transfer and deformation of FPCB under thermal and flow effects using fluid structure interaction, focusing on the electronic cooling process and factors affecting FPCB with attached BGA packages. Empirical correlation equations for key factors have been established, providing guidelines for thermal coupling modeling in FPCB design.
Article
Energy & Fuels
Mohamed Elnaggar, Hala J. El-Khozondar, Mohammed J. K. Bashir, Wael A. Salah, Mohammed Al-Agha, Mohammed Abudaqqa, Abdullah El-mabhouh
Summary: This study focuses on the potential of wind energy as a renewable and clean source of energy in Gaza for sustainable economy and environmental conservation. It found that different rotor diameters of wind turbines have varying effects on the turbine's performance and energy production. Using wind energy in Gaza can lead to significant annual energy savings and reduction in CO2 emissions.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Environmental Sciences
M. Elnaggar, H. J. El-Khozondar, M. J. K. Bashir, W. A. Salah
Summary: This study aims to improve the solar hot water system in Gaza by determining the optimal tilt angle and incidence angle. Simulation results show that the useful energy gain of a solar thermal collector depends on the values of the tilt and incidence angles. The optimized angles can lead to higher energy efficiency and cost savings.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Polymer Science
Agustinus Purna Irawan, Deni Fajar Fitriyana, Cionita Tezara, Januar Parlaungan Siregar, Dwinita Laksmidewi, Gregorius Dimas Baskara, Mohd Zulkfly Abdullah, Ramli Junid, Agung Efriyo Hadi, Mohammad Hazim Mohamad Hamdan, Najid Najid
Summary: The braking system plays a crucial role in automotive safety. The durability and quality of brake pads are vital for their effective functioning. Asbestos, a harmful material, has been widely used in brake pad manufacturing but efforts are being made to find natural alternatives. This review focuses on analyzing the key parameters affecting brake pad performance and discusses the composition of fillers and fiber reinforcements in polymer composites.
Article
Green & Sustainable Science & Technology
Fahad Al-Amri, Farooq Saeed, Muhammad Abdul Mujeebu
Summary: One of the major challenges in the PV industry is to effectively cool the PV panel during its operation. This study introduces a dual-function PV panel racking structure that acts as both a mechanical support and a heat sink. Numerical analysis and field experiments validate that the modified structure can reduce panel temperature and increase panel efficiency, resulting in a lower levelized cost of electricity.
Article
Chemistry, Multidisciplinary
Mohd Zulkifly Abdullah, Kok Hwa Yu, Hao Yuan Loh, Roslan Kamarudin, Prem Gunnasegaran, Abdusalam Alkhwaji
Summary: The study found that the density, thermal conductivity, and viscosity of Cu-Ni hybrid nanofluids increase with volume fraction, while the specific heat capacity at constant pressure decreases with volume fraction.
Article
Engineering, Mechanical
Isam Qasem, Ahmed A. Hussien, Ayub Ahmed Janvekar, Pramodkumar S. Kataraki, Miroslaw Pracki, M. Abdul Mujeebu
Summary: Superfinishing is a method used for high-quality surface machining of elements subjected to high surface wear. This experimental study focused on determining the effect of machining parameters on surface roughness of high-quality alloy bearing steel. The results showed that the optimum surface quality depended on the process parameters, including grain size, machining time, crosshatch angle, and contact pressure. The study also established regression equations and multidimensional correlations for subsequent roughness and performance parameters.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2022)
Article
Thermodynamics
Muhammad Abdul Mujeebu, Farheen Bano
Summary: This study analyzes the energy-saving potential and economic viability of adopting passive energy conservation measures in a detached family house in a warm-humid climate of South India and provides a systematic approach for incorporating passive design options at the early design stage.
Article
Chemistry, Multidisciplinary
Vignesh Vicki Wanatasanappan, Munirah Rezman, Mohd Zulkifly Abdullah
Summary: This study investigates the thermophysical properties of vegetable base oils suspended with Al2O3-TiO2 nanoparticles. The results show that palm oil-based hybrid nanofluids exhibit superior thermal conductivity and viscosity, making them suitable for enhancing the performance of insulation oil in the electrical power sector.
Review
Energy & Fuels
Muthukumar Palanisamy, Lav Kumar Kaushik, Arun Kumar Mahalingam, Sunita Deb, Pratibha Maurya, Sofia Rani Shaik, Muhammad Abdul Mujeebu
Summary: This paper provides a comprehensive review of the advancements in the design and development of efficient and clean cook-stoves operated by gaseous and liquid fuels worldwide. It covers various technical aspects such as stable operating conditions, flame propagation, heat transfer, fuel consumption, thermal efficiency, and emissions. The review summarizes different cook-stove technologies reported in both laboratory-scale and field studies, evaluating their commercial viability. It also presents numerical modeling of combustion, health and environmental impacts of unclean cooking technologies, and government initiatives for promoting cleaner cooking practices, along with suggestions for future work.
Article
Polymer Science
Agustinus Purna Irawan, Paula Tjatoerwidya Anggarina, Didi Widya Utama, Najid Najid, Mohd Zulkfly Abdullah, Januar Parlaungan Siregar, Tezara Cionita, Deni Fajar Fitriyana, Jamiluddin Jaafar, Agung Efriyo Hadi, Teuku Rihayat
Summary: The investigation of hybrid, woven, natural fiber-reinforced polymer composites as a substitute reinforcement for fiber polymer composites has gained significant interest. The research found that woven rattan and glass fiber hybrid composites exhibit good mechanical properties and thermal stability, making them suitable for automotive applications.
Article
Green & Sustainable Science & Technology
Mario Toledo, Andres Arriagada, Nicolas Ripoll, Eugene A. Salgansky, Muhammad Abdul Mujeebu
Summary: This comprehensive review discusses the modeling, development, industrial applications, and future directions of the hybrid filtration combustion (HFC) technology for producing hydrogen and syngas. The HFC reactors have been successfully optimized through mathematical modeling and novel approaches to complex chemical kinetics. Key parameters for optimizing the yield of hydrogen and syngas include the composition of solid feedstocks, gasifying agents, and mode of operation. HFC has shown promising potential as an energy-efficient and sustainable alternative for hydrogen and syngas production from various solid and gaseous feedstocks.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Multidisciplinary Sciences
Mohamed Elnaggar
Summary: This study investigated the energy crisis in Gaza and emphasized the need for renewable sources such as solar thermal energy. The use of solar water heaters and solar air heaters was found to be suitable for space heating in buildings, leading to energy cost savings and reduced CO2 emissions.
Article
Agriculture, Multidisciplinary
Arshied Manzoor, Mohammad Ali Khan, Muhammad Abdul Mujeebu, Rayees Ahmad Shiekh
Summary: The study found that microwave-assisted osmotic dehydration process is more effective in increasing moisture loss, color change, and chroma while reducing solids gain and hue angle compared to conventional osmotic dehydration. The Henderson and Pabis model showed the best fit among the three models.
JOURNAL OF AGRICULTURE AND FOOD RESEARCH
(2021)
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)
