Article
Energy & Fuels
M. Prabhahar, Sulaiman Ali Alharbi, Hesham S. Almoallim, S. Prakash, M. Saravana Kumar, K. Surendrababu, S. Sendilvelan, K. Bhaskar, Josef Marousek, A. Anderson
Summary: In this study, the performance and emissions of the SICI mode (Split Injection Compression Ignition) were tested at various split injected ratios. The results showed that SICI mode can reduce soot and NOx emissions with an optimal recirculated exhaust gas rate of 20%.
Article
Green & Sustainable Science & Technology
Krishna Kumar Pandey, Murugan Sivalingam
Summary: In this study, the engine characteristics of an LHR diesel engine running on a synthetic antioxidant doped biodiesel-diesel blend were comprehensively assessed. The results showed that the coated engine had lower peak heat release rate and peak cylinder pressure, as well as reduced NO, HC, CO emissions and smoke opacity.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2022)
Article
Thermodynamics
Pravin Ashok Madane, Subrata Bhowmik, Rajsekhar Panua
Summary: The study highlights the positive influence of Undi ester blended diesel on the performance and emissions characteristics of a diesel engine. The ester blends improve brake thermal efficiency and decrease energy consumption, but result in higher nitrogen oxide emissions. Undi ethyl ester blends show slightly better performance than UME blends, with higher maximum in-cylinder pressure and heat release rate.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Ravikumar Jayabal, Sekar Subramani, Damodharan Dillikannan, Yuvarajan Devarajan, Lakshmanan Thangavelu, Mukilarasan Nedunchezhiyan, Gopal Kaliyaperumal, Melvin Victor De Poures
Summary: This study investigates the combined effect of compression ratio and exhaust gas recirculation on the combustion, performance, and emissions of a common rail direct injection engine fueled by a blend of sapota methyl ester and diesel. The results show that increasing the compression ratio reduces ignition delay and increases heat release rate. Higher exhaust gas recirculation rates reduce nitrogen oxide emissions but increase smoke opacity. The use of the biodiesel blend reduces hydrocarbon and carbon monoxide emissions compared to neat diesel. The optimal condition for improved combustion, performance, energy, and reduced emissions is a 50% biodiesel blend with a compression ratio of 16 and an exhaust gas recirculation rate of 20%.
Article
Thermodynamics
Mohan Govindasamy, Silambarasan Rajendran
Summary: This investigation explores the potential use of sapota biodiesel as a partial substitute for diesel fuel, demonstrating promising thermal stability, combustion characteristics, and reduced emissions. Experimental results show that the brake thermal efficiency of B20 is 1.08% higher than diesel, but the NO emissions from biodiesel are elevated due to a higher quantity of unsaturated esters.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Energy & Fuels
Iqbal Shahridzuan Abdullah, Amir Khalid, Norrizam Jaat, Ridwan Saputra Nursal, Hasan Koten, Yasin Karagoz
Summary: This study delved into the effects of blending ratios, injection pressure, and ambient temperature on ignition delay, combustion process, and emissions in diesel combustion. Results showed that higher ambient temperature led to reduced ignition delay and shortened initial heat release time, consequently lowering emissions.
Article
Energy & Fuels
Mohd Radzi Abu Mansor, Taib Iskandar Mohamad, Osama Sabah
Summary: This study investigates the combustion characteristics and emissions of a direct injection compression ignition engine fueled with a tri-fuel blend of hydrogen, methane, and diesel at different intake air temperatures. The results show that the presence of methane and hydrogen in the fuel mixture can enhance in-cylinder pressure, temperature, and heat release rate, but also lead to increased NOx emissions. Optimal intake temperature and balanced use of tri-fuel can significantly improve engine performance and emissions, with hydrogen playing a dominant role in reducing CO emissions.
Article
Energy & Fuels
Gandhi Pullagura, Srinivas Vadapalli, V. V. S. Prasad, Kodanda Rama Rao Chebattina
Summary: This experimental study investigates the effects of graphene nanoplatelets (GNPs) on the performance, combustion, and emissions of a diesel engine using Sterculia foetida seed oil biodiesel. The results demonstrate that adding a certain proportion of GNPs to biodiesel can significantly improve engine performance, combustion, and reduce emissions.
Article
Energy & Fuels
Qiuhong Tong, Hao Chen, Jingjing He, Xin Su, Zhao Wei, Fengyu Sun, Hongming Xu, Feng Wang
Summary: Blending cyclopentanone with diesel can prolong ignition delay, increase peak heat release rate, and peak in-cylinder temperature; emission tests show that it can effectively reduce particle number concentrations and volume concentrations, with lower number geometric mean diameters compared to pure diesel; however, there is a slight increase in NOx emissions observed.
Article
Energy & Fuels
Rajendiran Gopal, K. Mayilsamy, R. Subramanian, R. Venkatachalam, N. Nedunchezhian
Summary: The present study investigates the performance of a multi-cylinder direct injection (DI) diesel engine using diesel-biodiesel-ethanol fuel blends. The blends, consisting of 60% diesel, 30% biodiesel, and 10% ethanol on a volume basis, were tested for their emissions and combustion characteristics. The results showed that the hybrid fuel blends exhibited slightly lower peak pressure and lower premixed heat release compared to diesel, but higher diffusion stage heat release rate. The lower rate of pressure rise in the hybrid fuel blends indicates their suitability for diesel engines in terms of reduced combustion noise, improved thermal efficiency, and lower specific and cyclic emissions, except for unburned hydrocarbons in the exhaust.
INTERNATIONAL JOURNAL OF OIL GAS AND COAL TECHNOLOGY
(2023)
Article
Energy & Fuels
Daniel Romeo Kamta Legue, Zacharie Merlin Ayissi, Mahamat Hassane Babikir, Marcel Obounou, Henri Paul Ekobena Fouda
Summary: This study compares the combustion characteristics of a compression-ignition engine fueled by neem biodiesel (B100) and conventional diesel (D100) under different loads, showing that B100 generates higher cylinder pressures under the same conditions. The issue of high pressure associated with biodiesel use in engines can be solved by optimizing ignition delay, and at different loads, the heat release rate of D100 is higher than that of B100.
Article
Energy & Fuels
Elyasa Al-Gharibeh, Kamal Kumar
Summary: Experimental investigation on low-temperature oxidation of methyl decanoate was conducted in a motored engine, revealing stable intermediate species and oxidation products. Moreover, the study compared the experimental data to numerical results to identify differences.
Article
Energy & Fuels
Nikita Zuev, Andrey Kozlov, Alexey Terenchenko, Kirill Karpukhin, Ulugbek Azimov
Summary: Using biodiesel fuel in diesel engines for heavy-duty transport is important to meet strict emission regulations. However, analysis and tuning of fuel injection parameters are necessary to optimize combustion processes and emissions. A four-injections strategy was used, leading to decreased NOx emissions and compression work but lower combustion efficiency.
Article
Green & Sustainable Science & Technology
Nageswara Rao Gangolu, Bala Rama Krishna Chunchu, Abshalomu Yallamati, Radha Krishna Gopidesi
Summary: Experimental results showed that B20 biodiesel blend at compression ratio 19 exhibited lower emissions and higher brake thermal efficiency compared to other samples, suggesting the promising outcome for compression ignition engines with the use of B20 at CR19.
ENVIRONMENT DEVELOPMENT AND SUSTAINABILITY
(2022)
Article
Energy & Fuels
Gandhi Pullagura, Srinivas Vadapalli, V. Varaha Siva Prasad, Joga Rao Bikkavolu, Kodanda Rama Rao Chebattina, Debabrata Barik, Milon Selvam Dennison
Summary: The aim of this study was to investigate the combustion, performance, and emission characteristics of a diesel engine using graphene nanoplatelets and dimethyl carbonate as fuel additives in a biodiesel blend. Nanofuels were prepared by ultrasonication and the behavior of graphene nanoplatelets was characterized using various techniques. The results showed that the combination of graphene nanoplatelets and dimethyl carbonate additives presented great potential in improving engine performance and reducing emissions.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Energy & Fuels
Ahmed S. Saad, Shinichi Ookawara, Mahmoud Ahmed
Summary: This study investigates the influence of stage aspect ratio on the performance parameters of a multi-stage Savonius vertical-axis wind turbine. Using a comprehensive numerical model and assessment technique, it is found that multi-stage rotors with stage aspect ratio equal to or greater than 1.0 exhibit higher output power, improved self-starting abilities, and reduced oscillations in torque and thrust coefficients.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Energy & Fuels
Mohamed Rami Gaddem, Shinichi Ookawara, Krishna D. P. Nigam, Shiro Yoshikawa, Hideyuki Matsumoto
Summary: This paper proposes a novel tubular microreactor called arc flow inverter (AFI) to enhance mixing. The design of AFI expands the design space of mixing/reactor devices by including curved tubes and 90 degree bends. Numerical studies reveal that the profile of Dean vortices in AFI is spatially periodic along the axis. The narrower residence time distribution in AFI compared to conventional flow inverter implies improved lateral mixing due to the Dean vortices. Experimental results also show that AFI outperforms other fluidic devices in terms of mixedness coefficient.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2022)
Article
Thermodynamics
Aly M. A. Soliman, Mohamed S. Yousef, Shinichi Ookawara, Hamdy Hassan
Summary: This paper experimentally investigates the use of a flat heat pipe - phase change material hybrid system for thermal regulation of simulated PV. The results show the best cooling and energy storage performance is achieved with Rubitherm RT-35 H PCM and the addition of heat sinks.
EXPERIMENTAL HEAT TRANSFER
(2023)
Article
Green & Sustainable Science & Technology
Hany S. EL-Mesery, Ahmed EL-Seesy, Zicheng Hu, Yang Li
Summary: This review provides comprehensive information on the design and applications of solar dryers, as well as the challenges and advancements in large-scale solar energy drying. It offers valuable insights for the development of sustainable food drying technology.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Energy & Fuels
Ahmed A. Hassan, Ahmed E. Elwardany, Shinichi Ookawara, Hidetoshi Sekiguchi, Hamdy Hassan
Summary: In this study, a theoretical analysis and economic evaluation were conducted on a hybrid solar system-driven integrated reverse osmosis/adsorption multigeneration system. The study proposed a hybrid solar system that utilizes evacuated tube collectors and photovoltaic/thermal collectors to supply heat and electricity. The results showed that increasing the share of photovoltaic/thermal collectors improved the system's energy and exergy efficiencies and economic performance, but decreased the cooling capacity.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Thermodynamics
Mohamed G. Gado, Shinichi Ookawara, Sameh Nada, Hamdy Hassan
Summary: The study evaluates the intermittent characteristics of hybrid adsorption-compression refrigeration systems for cold storerooms, utilizing low-grade heat and natural refrigerants. Mathematical modeling shows that, compared to the baseline system, the hybrid system demonstrates improved energy efficiency and stability in intermittent operation mode.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2022)
Article
Green & Sustainable Science & Technology
Ahmed I. EL-Seesy, Mahmoud S. Waly, Zhixia He, Hesham M. El-Batsh, Alhassan Nasser, Radwan M. El-Zoheiry
Summary: This research aimed to improve the applicability of methanol in CI engines by using n-octanol, diethyl ether, and nanoparticle additives. The results showed that these additives enhanced the stability, combustion, and emission characteristics of the methanol-diesel blends.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Green & Sustainable Science & Technology
Ramadan Gad, Hatem Mahmoud, Shinichi Ookawara, Hamdy Hassan
Summary: This study investigates the thermal regulation of PV panels using an innovative hybrid cooling system of flat heat pipes (HPs) and phase change material (PCM). The results show that the cooling system significantly enhances the performance of the PV panels, including temperature reduction, improvement in electric efficiency, and system efficiency.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Environmental
Tomoki Yasuda, Shinichi Ookawara, Shiro Yoshikawa, Hideyuki Matsumoto
Summary: This study proposes a framework for discovering porous materials that can improve the actual manufacturing process. By optimizing design variable recipes, ideal structures with high permeability and filtration efficiency have been obtained.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Mohamed G. Gado, Shinichi Ookawara, Hamdy Hassan
Summary: In this study, triply periodic minimal surface (TPMS) structures were used in adsorption cooling systems (ACSs) to improve performance. The use of metal TPMS-based structures significantly increased the thermal conductivity of the porous media/metal composite due to its large surface area. A CFD model was created and validated using Ansys Fluent. Five TPMS-based structures were compared with conventional Fins-based structures under different conditions. The results showed that TPMS structures had better cyclic cooling power (SCP) at certain porosities and can increase cooling capacity per day.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Materials Science, Multidisciplinary
M. Ismail, W. K. Zahra, Shinichi Ookawara, Hamdy Hassan
Summary: The performance of an air conditioning unit combined with phase change material as thermal energy storage in hot climates was investigated. A theoretical transient model was developed and numerically solved for plate and cylinder configurations. The results showed that the cylinder configuration had shorter discharging and charging durations compared to the plate configuration. Increasing the inlet air temperature decreased the exit air temperature and air conditioning coefficient of performance, but shortened the cooling time. Using phase change material with a lower melting temperature increased the melting time and exit air temperature. Mixing hybrid nanoparticles with phase change material had a short-term positive influence on air conditioning performance. The maximum power saving was 16.4% for the cylinder and 6.4% for the plate over a 2-hour and 10-hour working period, respectively.
Article
Energy & Fuels
Ramadan Gad, Hatem Mahmoud, Shinichi Ookawara, Hamdy Hassan
Summary: This study evaluates the thermal regulation of photovoltaic solar cells using a hybrid cooling system of flat heat pipes (HP) and phase change material (PCM), with and without hybrid nanoparticles. The evaluation is based on energetic, exergetic, economic, and environmental approaches. Results show that the HP-PCM cooling system outperforms natural solar panel cooling and the use of hybrid nanoparticles further enhances its performance. The proposed cooling system achieves significant reductions in operating temperature and improvements in solar panel efficiency compared to conventional systems. Additionally, the hybrid cooling system exhibits higher energy and exergy efficiency, as well as lower production costs, making it more effective and sustainable.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Shadrack K. Musyoka, Ahmed S. G. Khalil, Shinichi A. Ookawara, Ahmed E. Elwardany
Summary: In this experimental study, the effect of oxyfuel type, oxygen content, and blend volume on diesel engine performance, combustion, and emission characteristics was investigated. Seven fuel blends were tested and it was found that the additives had minimal effect on in-cylinder pressure and heat release rate. However, they were effective in reducing NOx emissions. Both fuel additives were suitable for CI engine at low blending ratios.
Article
Mechanics
Ahmed Elhanafy, Yasser Abuouf, Samir Elsagheer, Shinichi Ookawara, Mahmoud Ahmed
Summary: Diagnostic technology based on magnetic fields is commonly used in medicine, but exposure to strong electromagnetic fields has adverse effects on patients. This study investigates the effects of external uniform magnetic fields on blood flow in healthy and diseased cases, and determines safe values for field strength. A three-dimensional non-Newtonian flow model is developed to investigate the effects of the magnetic field on shear rate and hematocrit. Numerical simulations are conducted at different field strengths and orientations, and results demonstrate the dominant effect of the magnetic field in the Y-direction.
Article
Engineering, Chemical
Anthony Basuni Hamzah, Hideyuki Matsumoto, Shinichi Ookawara, Masashi Kikugawa, Yoshihiro Goto, Akinori Sato, Yuichi Manaka, Tetsuya Nanba
Summary: In this study, the catalytic performance and kinetic model of novel lanthanoid oxide-supported Ru catalysts for NH3 synthesis were investigated. The Ru/CeLaTiOx catalyst outperformed conventional Ru/MgO and Ru/CeO2 catalysts across the evaluated conditions, with high NH3 synthesis rates achievable. The LH kinetic model incorporating NHx adsorption was optimized, highlighting the operational advantage of the introduced catalysts. Process simulation analysis achieved predicted efficiency and energy consumption for NH3 synthesis.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(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)
