Article
Chemistry, Physical
Ziqiang He, Yunfei Yan, Xiuquan Li, Kaiming Shen, Junnan Li, Zhien Zhang
Summary: The study focuses on the impact of hydrogen mass flow rate, equivalence ratio, and materials on the thermal performance of micro-thermophotovoltaic (MTPV) system, providing suggestions for improving energy output.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Yu Wang, Jianfeng Pan, Junfeng Wang, Qingbo Lu, Yi Zhang, Evans K. Quaye
Summary: The FREI dynamics of methane/oxygen mixture were experimentally observed in a micro quartz tube combustor. A 2-D model successfully predicted the propagation features of the FREI flame, which were in agreement with the experimental results. Four stages of flame front propagation were revealed based on simulations: accelerating stage, decelerating stage, reverse propagating stage, and weak reaction stage. Further analysis on radical and heat release rate (HRR) confirmed that the regeneration of CH4 behind the flame front and the reducing consumption of the overall amount of methane were the main factors for flame deacceleration and eventually extinction. After extinction, methane consumption tended to occur along the combustor wall due to the high wall temperature.
Article
Energy & Fuels
Shoujun Ren, William P. Jones, Xiaohan Wang
Summary: The hydrogen-enrichment combustion performance was numerically investigated using different volume proportions of hydrogen mixed with methane in a vortex-tube combustor. The results show that this combustion technique exhibits good adaptability and ultra-steady combustion with a high stability limit. The non-premixed flame structure enhances the local concentration of species and improves stability, while the strong vortex flow inhibits flame blow-out. The laminarization of the flow field provides good aerodynamic and thermodynamic stability, resulting in a large Richardson number and ultra-weak thermo-acoustic coupling, indicating good flame-dynamic stability.
Article
Chemistry, Physical
Jianfeng Pan, Xiaojie Wang, Qingbo Lu, Linlin Chen, Yu Wang, Evans K. Quaye
Summary: The setting of a convex platform can significantly increase the maximum velocity while reducing the outlet velocity; increasing the height of the convex platform will increase turbulent kinetic energy, but has little effect on combustion intensity; increasing the inlet velocity can raise the axial temperature but decrease fuel conversion rate.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Won Hyun Kim, Tae Seon Park
Summary: This study explores the design of a combustor for a thermophotovoltaic (TPV) generator to strengthen the axis-switching phenomenon. Various simulations and flow field investigations are conducted to analyze the effects of noncircular holes in the combustor on combustion efficiency.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Energy & Fuels
Harun Yilmaz, Serhat Karyeyen, Ahmet Umit Tepe, Dieter Bruggemann
Summary: The colorless distributed combustion technique reduces pollutants emissions for a fuel/oxidizer mixture. In this study, the characteristics of colorless distributed combustion of hydrogen/air mixtures were numerically investigated in a micro combustor to overcome the difficulties associated with micro combustion and to obtain a more uniform temperature profile. It was found that colorless distributed combustion could be achieved by decreasing the oxygen concentration at different mixture inlet temperatures.
Article
Thermodynamics
Linhong Li, Guangyao Yang, Aiwu Fan
Summary: The study verified that a symmetrical configuration of micro-combustor can improve combustion efficiency and radiation efficiency, allowing it to operate at higher average velocities. Furthermore, as the average velocity increases, combustion efficiency decreases monotonically while radiation efficiency and radiant energy output increase first and then decrease.
Article
Engineering, Aerospace
Jianping LI, Kai Wang, Guiqian Jiao, Zilong Liao, Jindong LI
Summary: In this study, the combustion characteristics of a kerosene-fueled supersonic combustor were investigated using the flame stabilizing method of cavity and strut. The results showed that the combustor with the strut achieved independent and stable combustion of kerosene, and the porous injection behind the strut improved the atomization and combustion efficiency of kerosene.
CHINESE JOURNAL OF AERONAUTICS
(2022)
Article
Energy & Fuels
Zheng Zhang, Wubingyi Shen, Wei Yao, Qiu Wang, Wei Zhao
Summary: This study proposed a novel helical-fin-assisted micro-step Helix combustor to improve the performance of micro-combustors under high flow rates. The effects of the helical fins on the flow and combustion characteristics were analyzed and it was found that the helical fins enhance the heat transfer between the flame and fins, resulting in improved combustion efficiency. Choosing different flame stabilization modes for different applications can achieve higher thermal efficiency or combustion efficiency.
Article
Thermodynamics
Yi Zhang, Qingbo Lu, Baowei Fan, Wei Chen, Chao Jiang, Jianfeng Pan, Rongao Jia
Summary: This paper proposes a non-premixed micro-combustor system based on H2/Air combustion, which solves the problems of combustion stability and safety through the design of tangential inlet and vase-shaped channel. Numerical analysis shows that the vase-shaped micro-combustor has higher blow out limit and higher exergy efficiency.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Shoujun Ren, Haolin Yang, Xiaohan Wang
Summary: The study focuses on the oxygen-deficient combustion characteristics of methane in a localized stratified vortex-tube combustor (LSVC) by diluting combustion air with nitrogen. Experimental investigations show that LSVC can achieve a wide stability limit and low NOx emissions.
Article
Engineering, Multidisciplinary
Hazem S. Gitar, Yehia A. Eldrainy
Summary: Novel combustion techniques, such as colorless distributed combustion (CDC) or flameless combustion (FC), have been investigated to reduce emissions from gas turbines due to strict regulations on harmful emissions. The study examined the impact of factors like air diameter, confinement size, and excess air ratio on recirculation ratio in flameless combustion. Results showed a significant influence of combustor diameter and air jet diameter on NOx emissions.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Thermodynamics
Shoujun Ren, William P. Jones, Xiaohan Wang
Summary: In this study, a new ultra-steady combustion technique was developed for adaptable fuel combustion. The combustion performance of five different gaseous fuels was investigated in a stratified vortex-tube combustor, focusing on stability limit, pressure fluctuation, and flame topology. The results demonstrate that a uniform flame front and low pressure fluctuations can be achieved, leading to a super-steady combustion process. The non-premixed flame structure and vortex flow contribute to a high mass concentration near the reaction zone, inhibiting flame blow-out and providing self-adjusting capacity at different equivalence ratios. The synergistic effect of flow and flame structures promotes efficient combustion by transporting burned and unburned gases to the reaction zones.
Article
Thermodynamics
Emily Lin, Chad T. Wilson, Arny Leroy, Bachir El Fil
Summary: The development of a compact and lightweight entrainment-based catalytic micro-combustor with high energy density for heating portable systems is presented. The micro-combustor exhibits low ignition temperature, low energy consumption, and high heat fluxes. Long-term cyclic heating and fast heating/cooling capabilities make it promising for various applications in the commercial, defense, and energy conversion fields.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Energy & Fuels
Jiaqiang E, Lei Cai, Jintao Li, Jiangjun Ding, Jingwei Chen, Bo Luo
Summary: The study shows that in the catalytic combustor, homogeneous reactions are significantly weakened, resulting in higher and more uniform outer wall temperatures, better fluid mixing, and reduced temperature difference at the outer wall. Additionally, the catalytic combustor exhibits lower average flow velocity and pressure loss at an inlet velocity of 10 m/s.
Review
Thermodynamics
E. Jiaqiang, Bo Luo, Dandan Han, Jingwei Chen, Gaoliang Liao, Feng Zhang, Jiangjun Ding
Summary: This study discusses methods to improve combustion efficiency, including optimization of spatial structure, catalytic combustion, and fuel improvement. It also reviews the improvement of energy conversion and emission performance of micro thermophotovoltaic, micro thermoelectric, and micro engine systems. The study points out the limitations of single optimization methods and suggests that future research should combine the advantages of various methods.
Article
Engineering, Environmental
Jingwei Chen, Qiteng Wang, Hongda Wei, Tian Meng, E. Jiaqiang, Erwei Leng, Feng Zhang, Gaoliang Liao
Summary: Polyvinylidene fluoride (PVDF), as a thermoplastic fluoropolymer, is widely used as a binder in lithium batteries. However, PVDF has difficulty in natural degradation. Supercritical water (SCW) conversion, a clean and efficient conversion technology, is considered for the degradation of PVDF. Molecular dynamics method was used to analyze the effects of different reaction parameters on the decomposition of PVDF in SCW.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Jing Li, Wei Zuo, Jiaqiang E, Yuntian Zhang, Qingqing Li, Ke Sun, Kun Zhou, Guangde Zhang
Summary: A multi-objective optimization study of a mini U-channel cold plate with SiO2 nanofluid was conducted using Response Surface Methodology (RSM) and Non-dominated Sorting Genetic Algorithm (NSGA-II). Numerical investigations were performed to optimize design variables and objective functions, with analysis of variance used to verify the reliability of the regression models. The optimal design parameters and performance indicators were obtained through Pareto optimal solution.
Article
Green & Sustainable Science & Technology
Jingwei Chen, Yang Liu, Xiaomin Wu, Jiaqiang E, Erwei Leng, Feng Zhang, Gaoliang Liao
Summary: This paper investigates the thermodynamic and environmental performance of supercritical water gasification for hydrogen production using residue from a simultaneous saccharification and fermentation (SSF) process. The results show that increasing temperature and decreasing residue concentration can enhance the hydrogen production rate. Additionally, two methods to improve energy efficiency, including recycling waste heat and reheating cycle, are proposed.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Thermodynamics
Wei Zuo, Zijie Wang, E. Jiaqiang, Qingqing Li, Qianju Cheng, Yinkun Wu, Kun Zhou
Summary: Optimizing the structure of micro combustors to enhance their thermal performance can effectively improve the output power and energy conversion efficiency of micro thermophotovoltaic systems. The introduction of a tube outlet can effectively increase the mean outer wall temperature and temperature uniformity of micro planar combustors, as well as the energy output and energy conversion efficiency of MTPV system, but it also leads to higher pressure loss. The energy output and energy conversion efficiency of MTPV system can be further increased by reducing the tube length and increasing the tube diameter, while the pressure loss decreases slowly. When nickel is used as the solid wall material, the energy output and energy conversion efficiency of MTPV system can reach 6.14 W and 3.54%, respectively.
Article
Engineering, Environmental
Jingwei Chen, Yu Bai, Tian Meng, Qiteng Wang, Chenxi Wang, E. Jiaqiang
Summary: This study investigates the decomposition mechanisms of amoxicillin in supercritical water through molecular dynamics simulation. The results show that amoxicillin undergoes carbon ring opening, carbon chain breaking, and small molecular compound conversion in supercritical water. The OH radical plays a vital role in the decomposition process.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Wei Zuo, Dexin Li, E. Jiaqiang, Yongfang Xia, Qingqing Li, Yifan Quan, Guangde Zhang
Summary: A hydrogen-fueled micro planar combustor with cavity is designed to achieve high energy output power and energy conversion efficiency for micro-thermophotovoltaic system. Numerical investigations show that the micro planar combustor with cavity can achieve higher and more uniform outer wall temperature. With the reduction of cavity length and outlet size, the energy output and energy conversion efficiency of MTPV increase, but the pressure loss also becomes larger. The optimal dimensionless cavity length and outlet size are found to be 3/9 and 5/7 x 1/3, respectively. Nickel is identified as the optimal solid wall material for higher energy conversion efficiency, reaching 3.86% at an inlet velocity of 5 m/s. Therefore, the micro planar combustor with cavity is more suitable for MTPV system with higher energy output and energy conversion efficiency.
Article
Thermodynamics
Zhijie Chen, Wei Zuo, Kun Zhou, Qingqing Li, Yuhan Huang, E. Jiaqiang
Summary: This study optimized the performance of a proton exchange membrane fuel cell by using response surface methodology and non-dominated ranking genetic algorithm. The Pareto optimal solution obtained through this method improves the power density, system efficiency, and exergy efficiency of the fuel cell. This work provides a new multi-objective optimization method for designing more efficient fuel cells.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Review
Energy & Fuels
Zhiwei Shi, Qingguo Peng, Jiaqiang E, Bo Xie, Jia Wei, Ruixue Yin, Guang Fu
Summary: This article systematically reviews the modification methods of catalysts in selective catalytic reduction (SCR) technology, analyzes the effects of various catalyst parameters on denitrification efficiency, and discusses the influences of spatial structure on catalytic effect. Additionally, it compares the performance of catalysts with different components and summarizes the current problems in catalyst research. The development of NH3-SCR technology is also prospected.
Article
Thermodynamics
Wei Zuo, Jing Li, Yuntian Zhang, Qingqing Li
Summary: To cool a prismatic LiMn2O4 battery, two mini U-channel cold plates are used to attach to the front and back surface of the battery. The maximum temperature and temperature distribution of the battery under different flow directions (Cooling plan A and cooling plan B) are numerically analyzed. The results show that the maximum temperature of the battery is reduced to around 311.8 K under both cooling plans at specific conditions, indicating the suitability of the temperature range. Moreover, cooling plan B provides a more uniform temperature distribution compared to cooling plan A, suggesting its applicability for cooling a prismatic LiMn2O4 battery.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Wei Zuo, Zhijie Chen, E. Jiaqiang, Qingqing Li, Guangde Zhang, Yuhan Huang
Summary: A hydrogen-fueled micro planar combustor with tube outlet is designed to improve the energy output power and energy conversion efficiency for micro-thermophotovoltaic system. The effects of tube outlet structure parameters on the performance of micro planar combustor are numerically investigated. The results show that increasing the tube distance slightly improves the energy output and conversion efficiency, and reduces the pressure loss. Additionally, using square tubes instead of circular tubes is more suitable for the MTPV system, and increasing the number of tubes significantly enhances the energy output and conversion efficiency while reducing pressure loss.
Article
Thermodynamics
Dexin Li, Wei Zuo, Qingqing Li, Guangde Zhang, Kun Zhou, Jiaqiang E
Summary: In this study, the effects of pulsating flow and steady flow on the heat transfer and energy consumption of a multi-channel cold plate were compared and analyzed. Results show that pulsating flow has both positive and negative effects on heat transfer, pressure loss, and efficiency index during the total discharge process. The positive and negative effects are stronger with increasing pulsation amplitude at a fixed frequency. The energy consumption of pumping coolant under pulsating flow first decreases to a minimum value and then increases with further increase in pulsation amplitude.
Article
Thermodynamics
Wei Zuo, Dexin Li, Qingqing Li, Qianju Cheng, Kun Zhou, Jiaqiang E
Summary: In this study, a multi-objective optimization of a multi-channel cold plate under intermittent pulsating flow is conducted using Response Surface Methodology (RSM) and Non-dominated Sorting Genetic Algorithm II (NSGA-II). The trade-off between the average heat transfer coefficient and energy consumption is achieved. Numerical investigations and regression models are employed to determine the optimal design variables and objective function values.
Article
Thermodynamics
Zhijie Chen, Wei Zuo, Kun Zhou, Qingqing Li, Yuhan Huang, E. Jiaqiang
Summary: In this study, Taguchi experimental design, grey relational analysis, and analysis of variance were combined to investigate the impact of various factors on the performance of high-temperature proton exchange membranes fuel cell (HT-PEMFC). The results showed that the membrane thickness had the most significant contribution to the power density, while the anode stoichiometry ratio had the most significant contribution to the system efficiency and exergy efficiency of HT-PEMFC. This study provides important reference and valuable guidance for designing HT-PEMFC.
Article
Thermodynamics
Hongshuo Zhao, Wei Zuo, Qingqing Li, Qianju Cheng, Ni Pan, Kun Zhou
Summary: The design of a reasonable and efficient motor cooling system is crucial for a high temperature surface type permanent magnet synchronous motor (STPMSM). This work compares and analyzes the heat transfer coefficients and pressure losses of the ordinary spiral round channel (OSRC) and the grooved spiral round channel (GSRC) under different conditions. The results show that the GSRC has reduced pressure loss and increased heat transfer coefficient compared to the OSRC. Furthermore, the thermal-hydraulic performance evaluation using the performance evaluation criterion (PEC) demonstrates that the GSRC is significantly superior to the OSRC.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.
