Article
Chemistry, Physical
Jinxin Yang, Changwei Ji, Shuofeng Wang, Hao Meng
Summary: This study investigated the effect of ignition timing on a hydrogen-fueled Wankel rotary engine under low speed, part load, and lean combustion conditions, highlighting the importance of selecting the appropriate ignition timing for engine performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Hao Meng, Changwei Ji, Shuofeng Wang, Du Wang, Jinxin Yang
Summary: This study aimed to improve the idle performance of the n-butanol rotary engine by blending hydrogen and reducing idle speed. Results showed that hydrogen could enhance engine stability and economy, as well as effectively reduce CO and HC emissions. In addition, hydrogen enrichment could compensate for the negative effects of reducing idle speed on combustion and emissions.
Article
Chemistry, Physical
Prem Kumar Chaurasiya, Upendra Rajak, Ibham Veza, Tikendra Nath Verma, Umit Agbulut
Summary: In this research, the combustion performance of diesel fuel, diethyl ether, n-butanol, and spirulina microalgae was investigated by adding 5% hydrogen. The results showed that the blend of 5% hydrogen with 95% diethyl ether consistently had the highest specific fuel consumption with advancing injection timings. The addition of 5% hydrogen into 95% n-butanol resulted in a relatively stable brake thermal efficiency for all injection timings. The use of n-butanol consistently produced the lowest emissions of CO2, smoke, NOX, and particulate matter throughout the entire injection timings.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Jianbing Gao, Guohong Tian, Chaochen Ma, Liyong Huang, Shikai Xing
Summary: The study investigated the performance of an ORP engine fueled with hydrogen under different ignition timing conditions, showing that late ignition significantly reduced peak in-cylinder pressure and heat release rates were more sensitive to late ignition. Ignition timing had limited impacts on pressure and power, while early ignition increased nitrogen oxides emission factors.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Yuqiang Li, Bingqian Lou, Shitu Abubakar, Gang Wu
Summary: The comprehensive skeletal mechanism proposed in this study shows excellent performance in predicting the combustion characteristics of IBE mixture and n-butanol in diesel engine. The effective reproduction of engine combustion and emissions characteristics provides a solid foundation for the potential of IBE in diesel blends.
Article
Energy & Fuels
Hao Meng, Changwei Ji, Jinxin Yang, Shuofeng Wang, Gu Xin, Ke Chang, Huaiyu Wang
Summary: This work experimentally investigates the asynchronous ignition in a hydrogen-fueled Wankel rotary engine. The findings demonstrate that a suitable asynchronous ignition can lead to better power performance and earlier ignition timing of the leading plug is more preferable. Moreover, asynchronous ignition can also reduce knock tendency and achieve a lower maximum pressure rising rate.
Article
Energy & Fuels
Liang Yu, Haoqing Wu, Wenbin Zhao, Yong Qian, Lei Zhu, Xingcai Lu
Summary: This study investigated the performance of n-butanol as a fuel for spark ignition aviation piston engines and compared it with gasoline. N-butanol had advantages of shorter flame development, rapid combustion, higher thermal efficiency, and lower CO and NOx emissions compared to gasoline, but led to an increase in fuel consumption. The use of n-butanol/kerosene mixed fuel with higher energy density was proposed to improve efficiency, but its antiknock performance needed enhancement through high octane additives.
Article
Energy & Fuels
Zehra Sahin, Orhan Nazim Aksu, Coskun Bayram
Summary: This study found that using n-butanol/gasoline blends (nBGBs) in automobile spark-ignition engines can reduce fuel consumption and CO, THC emissions, but increase NOx emissions. Water injection can reduce NOx emissions, but increase THC and fuel cost.
Article
Energy & Fuels
Edwin Jia Chiet Choo, Xinwei Cheng, Gianfranco Scribano, Hoon Kiat Ng, Suyin Gan
Summary: The study found that n-dodecane-n-butanol blend undergoes a two-stage ignition regardless of n-butanol blending ratio and ambient temperature, with the first-stage ignition site located at the periphery of the spray and the second-stage ignition site moving to the spray head. Mass fractions of certain species shift slightly towards the fuel-lean region at higher n-butanol blending ratio and lower ambient temperature, resulting in wider distribution of the low-temperature combustion mode.
Article
Energy & Fuels
Jianbing Gao, Xiaochen Wang, Guohong Tian, Panpan Song, Chaochen Ma, Liyong Huang
Summary: The study found that hydrogen distribution in the combustion chambers was most uneven at a start of injection of -68.2 degrees crank angle (CA) after top dead centre (aTDC) among three injection strategies; meanwhile, it showed the lowest combustion efficiency, below 98.5%. The peak in-cylinder pressure ranged from 40 bar to 83 bar for the given scenarios. Combustion durations were between 20 degrees CA to 30 degrees CA, with ignition timing ranging from -20.85 degrees CA aTDC to -11.06 degrees CA aTDC.
Article
Chemistry, Physical
Ozgur Oguz Taskiran
Summary: This study numerically investigated the classical R13b-Renesis Wankel engine and a modified engine with turbulent jet ignition using hydrogen as a supplement. The results showed that both hydrogen addition and turbulent jet ignition are effective in increasing fuel burning speed, with hydrogen addition also increasing indicated mean effective pressure (IMEP).
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Arkadiusz Jamrozik, Wojciech Tutak, Karol Grab-Rogalinski
Summary: The study demonstrates that adding 60% n-butanol to diesel fuel can increase ignition delay by 39%, shorten combustion duration by 57%, and affect emissions. The dual-fuel engine operates stably across the entire range of n-butanol content.
Article
Energy & Fuels
Xiaoyu Cong, Changwei Ji, Shuofeng Wang
Summary: The study found that blending DME can extend flame development and propagation periods, increase power output of the neat hydrogen engine, and reduce nitrogen oxides emissions. However, blending DME may increase cyclic variation due to weakened flame kernel and propagation process, but emissions can be controlled by adjusting the DME fraction.
Article
Energy & Fuels
Yuanqi Bai, Ying Wang, Lei Hao
Summary: This study investigated the combustion and emission characteristics of a dual-fuel direct injection system using n-butanol and diesel. The results showed that stable and high-efficient combustion could be achieved in n-butanol/diesel DFDI mode, with an increase in indicated thermal efficiency and a decrease in nitrogen oxide and soot emissions.
Article
Environmental Sciences
T. Palani, G. S. Esakkimuthu, G. Dhamodaran, S. Seetharaman
Summary: This paper discusses the performance, emission, and combustion characteristics of multi-cylinder SI engines using ethanol-n butanol-unleaded gasoline blends as fuel. It is found that increased blend percentage leads to higher brake thermal efficiency. The blends also result in significant reduction in hydrocarbon and carbon monoxide emissions, while increasing oxides of nitrogen emissions. The highest in-cylinder pressure is achieved with the EB20 blend.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(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)