Review
Thermodynamics
Yiyu Men, Xiaohua Liu, Tao Zhang
Summary: The technology of waste heat recovery from medium-low temperature flue gas has been extensively reviewed, focusing on the principle and characteristics of various systems. More advanced waste heat recovery systems are proposed to enhance the difference between the cold source and the flue gas, with heat recovery efficiency exceeding 80% in some cases. Specific systems, such as heat pump systems and vapor pump boiler systems, are analyzed for their efficiency, economic benefits, and pollutant emissions.
Article
Energy & Fuels
Xiaoming Dong, Cancan Zhang, Yuting Wu, Yuanwei Lu, Chongfang Mu
Summary: This study analyzes the effect of structural and operating parameters on the performance of a molten salt-supercritical CO2 concentric tube heat exchanger using the distributed parameter method. Optimal design and optimization calculations are conducted to improve the heat exchange efficiency.
Article
Thermodynamics
Jian-Wei Zhao, Rui Zhao, Yong-Le Nian, Wen-Long Cheng
Summary: The varying density of supercritical carbon dioxide affects heat transfer, with the adaptive flow path proving effective in reducing pressure loss. Additionally, flow direction has a significant impact on heat transfer coefficients.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Fikret Alic
Summary: This paper investigates the thermal system of two concentric hollow cylinders, exploring the effects of different heating and insulation configurations on thermal entropy and entransy efficiency. The study reveals the differences in thermal entropy and entransy efficiency between the inner and outer cylinders and establishes the relationship between the two.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Feng Jin, Deqi Chen, Lian Hu, Yanping Huang, Hao Zeng, Junfeng Wang
Summary: The study investigated the heat transfer and flow resistance of different types of Printed Circuit Heat Exchangers (PCHE) under precooling conditions using numerical methods. The results showed that the zigzag channel PCHE had better heat transfer performance compared to the wavy and airfoil fin channels, while the airfoil fin channel had a lower friction factor.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Jian Wang, Xin-ping Yan, Bendiks J. Boersma, Ming-jian Lu, Xiaohua Liu
Summary: Printed circuit heat exchangers (PCHE) are proposed to improve heat recovery and energy saving in supercritical CO2 (S-CO2) power cycles. A modified channel PCHE is investigated to enhance the thermal-hydraulic performance. The results show that the inserted straight section reduces pressure loss and improves flow uniformity, leading to a significant improvement in performance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Feng Jin, Deqi Chen, Lian Hu, Yanping Huang, Shanshan Bu
Summary: This paper investigates the flow distribution and thermohydraulic characteristics of printed circuit heat exchanger (PCHE) with different channel configurations. It is found that PCHE with larger flow resistance in the core region shows better flow uniformity and heat transfer performance. A modified manifold with bent fins and airfoil fins is proposed to improve the flow maldistribution of PCHE, reducing the flow non-uniformity by 39.4% to 61.8% and increasing the overall performance by 5% to 8.5% compared to the original manifold.
APPLIED THERMAL ENGINEERING
(2023)
Review
Energy & Fuels
Wenguang Li, Zhibin Yu
Summary: This article presents a critical review of heat exchangers for cooled supercritical carbon dioxide flows, highlighting SCO2 heat transfer features, analyzing SCO2 heat transfer characteristics in detail, and summarizing SCO2 heat transfer enhancement methods.
Article
Thermodynamics
Feng Jin, Deqi Chen, Lian Hu, Yanping Huang, Shanshan Bu
Summary: This study optimized the structural parameters of a zigzag channel in a printed circuit heat exchanger to improve its performance and size. By using the non-dominated sorting genetic algorithm-II and artificial neural network method, the flow and heat transfer performance under different structural parameters can be predicted and optimized effectively.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Mengdi Guo, Wenhao Pu, Qi Zhang, Zhaohui Yao, Yubin Qin, Jiabin Wang
Summary: In this article, the application of a non-uniform plate heat exchanger for waste heat recovery is studied through numerical and experimental methods. By optimizing the structural and operation parameters, the best heat transfer performance is obtained, improving the heat exchange efficiency and thermal performance.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Thermodynamics
Ed Robey, Sridharan Ramesh, Adrian S. Sabau, Abas Abdoli, James Black, Doug Straub, Joe Yip
Summary: In this study, a Plate Pin-Fin (PPF) heat exchanger has been proposed as a recuperator for supercritical CO2 (sCO(2)) power cycles. The design utilizes additive manufacturing capabilities to optimize the material requirement and achieve high efficiency at low cost. Numerical simulations validate the heat transfer and pressure loss correlations, and the optimized PPF heat exchanger shows potential to be an alternative to current state-of-the-art sCO(2) recuperators.
Article
Chemistry, Multidisciplinary
Yi Tu, Yu Zeng
Summary: This study compares the flow and heat transfer performance of SCO2 fluid in microchannels with different cross-sectional shapes. The results show that the cross-sectional shape significantly affects the heat convection coefficient, with acute angles weakening the heat transfer performance.
JOURNAL OF CHEMISTRY
(2021)
Article
Thermodynamics
ZengXiao Han, Jiangfeng Guo, Haiyan Zhang, Junlin Chen, Xiulan Huai, Xinying Cui
Summary: The study found that the heat effectiveness of the novel airfoil fins heat exchanger can reach more than 96%, higher than conventional heat exchangers. The novel airfoil channel showed the best comprehensive thermal-hydraulic performance among the three channels in terms of thermodynamics and heat transfer. The proposed correlations for Nusselt number and friction factor of the novel airfoil fins heat exchanger had maximum deviations within +/- 5.0% and +/- 7.1% for flue gas, providing guidance for its application in waste heat recovery.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Jiangfeng Guo, Jian Song, Yao Zhao, Konstantin S. Pervunin, Christos N. Markides
Summary: The thermo-hydraulic characteristics of heated supercritical CO2 flows were numerically investigated in a vertical pipe. The results showed that heat transfer was enhanced in downward flows but deteriorated in upward flows. The heat flux distribution had a significant effect on the heat transfer performance, and the turbulence production in the core region of the flow was suppressed in upward flows.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Alireza Zendehboudi, Zuliang Ye, Armin Hafner, Trond Andresen, Geir Skaugen
Summary: This paper investigates the heat transfer and pressure drop characteristics of supercritical CO2 in brazed plate heat exchangers, finding that thermal resistance in the CO2 side is the main factor affecting total heat transfer. Increasing CO2 mass flow rate significantly improves heat transfer coefficients, and factors such as water flow rate, CO2 pressure, and buoyancy force also play a role in heat transfer under different operating conditions.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Jiangfeng Guo, Xiulan Huai
APPLIED THERMAL ENGINEERING
(2016)
Article
Thermodynamics
Jiangfeng Guo, Xiulan Huai
APPLIED THERMAL ENGINEERING
(2016)
Article
Thermodynamics
Min Xu, Jun Cai, Jiangfeng Guo, Xiulan Huai, Zhigang Liu, Hang Zhang
Article
Thermodynamics
Jiangfeng Guo, Xiulan Huai
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2017)
Article
Chemistry, Physical
Mengru Xiang, Jiangfeng Guo, Xiulan Huai, Xinying Cui
JOURNAL OF SUPERCRITICAL FLUIDS
(2017)
Article
Thermodynamics
Xinying Cui, Jiangfeng Guo, Xiulan Huai, Keyong Cheng, Haiyang Zhang, Mengru Xiang
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2018)
Article
Thermodynamics
Jiangfeng Guo, Xiulan Huai, Keyong Cheng, Xinying Cui, Haiyan Zhang
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2018)
Article
Green & Sustainable Science & Technology
Jiangfeng Guo, Xiulan Huai, Keyong Cheng
Article
Thermodynamics
Jiangfeng Guo, Mengru Xiang, Haiyan Zhang, Xiulan Huai, Keyong Cheng, Xinying Cui
Article
Thermodynamics
Jiangfeng Guo, Xinying Cui, Xiulan Huai, Keyong Cheng, Haiyan Zhang
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2019)
Article
Thermodynamics
Xinying Cui, Jiangfeng Guo, Xiulan Huai, Haiyan Zhang, Keyong Cheng, Jingzhi Zhou
Article
Thermodynamics
Haiyan Zhang, Jiangfeng Guo, Xiulan Huai, Xinying Cui, Keyong Cheng
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2019)
Article
Chemistry, Physical
Haiyan Zhang, Jiangfeng Guo, Xiulan Huai, Keyong Cheng, Xinying Cui
JOURNAL OF SUPERCRITICAL FLUIDS
(2019)
Proceedings Paper
Energy & Fuels
Jiangfeng Guo, Xinying Cui, Haiyan Zhang, Xiulan Huai, Keyong Cheng
INNOVATIVE SOLUTIONS FOR ENERGY TRANSITIONS
(2019)
Article
Energy & Fuels
Shitong Fang, Houfan Du, Tao Yan, Keyu Chen, Zhiyuan Li, Xiaoqing Ma, Zhihui Lai, Shengxi Zhou
Summary: This paper proposes a new type of nonlinear VIV energy harvester (ANVEH) that compensates for the decrease in peak energy output at low wind speeds by introducing an auxiliary structure. Theoretical and experimental results show that ANVEH performs better than traditional nonlinear VIV energy harvesters under various system parameter variations.
Article
Energy & Fuels
Wei Jiang, Shuo Zhang, Teng Wang, Yufei Zhang, Aimin Sha, Jingjing Xiao, Dongdong Yuan
Summary: A standardized method was developed to evaluate the availability of solar energy resources in road areas, which combined the Analytic Hierarchy Process (AHP) and the Geographic Information System (GIS). By analyzing critical factors and using a multi-indicator evaluation method, the method accurately evaluated the utilization of solar energy resources and guided the optimal location selection for road photovoltaic (PV) projects. The results provided guidance for the application of road PV projects and site selection for route corridors worldwide, promoting the integration of transportation and energy.
Article
Energy & Fuels
Chang Liu, Jacob A. Wrubel, Elliot Padgett, Guido Bender
Summary: The study investigates the effects of coating defects on the performance of the anode porous transport layer (PTL) in water electrolyzers. The results show that an increasing fraction of uncoated regions on the PTL leads to decreased cell performance, with continuous uncoated regions having a more severe impact compared to multiple thin uncoated strips.
Article
Energy & Fuels
Marcos Tostado-Veliz, Xiaolong Jin, Rohit Bhakar, Francisco Jurado
Summary: In this paper, a coordinated charging price mechanism for clusters of parking lots is proposed. The research shows that enabling vehicle-to-grid characteristics can bring significant economic benefits for users and the cluster coordinator, and vehicle-to-grid impacts noticeably on the risk-averse character of the uncertainty-aware strategies. The developed pricing mechanism can reduce the cost for users, avoiding to directly translate the energy cost to charging points.
Article
Energy & Fuels
Duan Kang
Summary: Building an energy superpower is a key strategy for China and a long-term goal for other countries. This study proposes an evaluation system and index for measuring energy superpower, and finds that China has significantly improved its ranking over the past 21 years, surpassing other countries.
Article
Energy & Fuels
Fucheng Deng, Yifei Wang, Xiaosen Li, Gang Li, Yi Wang, Bin Huang
Summary: This study investigated the synergistic blockage mechanism of sand and hydrate in gravel filling layer and the evolution of permeability in the layer. Experimental models and modified permeability models were established to analyze the effects of sand particles and hydrate formation on permeability. The study provided valuable insights for the safe and efficient exploitation of hydrate reservoirs.
Article
Energy & Fuels
Hao Wang, Xiwen Chen, Natan Vital, Edward Duffy, Abolfazl Razi
Summary: This study proposes a HVAC energy optimization model based on deep reinforcement learning algorithm. It achieves 37% energy savings and ensures thermal comfort for open office buildings. The model has a low complexity, uses a few controllable factors, and has a short training time with good generalizability.
Article
Energy & Fuels
Moyue Cong, Yongzhuo Gao, Weidong Wang, Long He, Xiwang Mao, Yi Long, Wei Dong
Summary: This study introduces a multi-strategy ultra-wideband energy harvesting device that achieves high power output without the need for external power input. By utilizing asymmetry, stagger array, magnetic coupling, and nonlinearity strategies, the device maintains a stable output voltage and high power density output at non-resonant frequencies. Temperature and humidity monitoring are performed using Bluetooth sensors to adaptively assess the device.
Article
Energy & Fuels
Tianshu Dong, Xiudong Duan, Yuanyuan Huang, Danji Huang, Yingdong Luo, Ziyu Liu, Xiaomeng Ai, Jiakun Fang, Chaolong Song
Summary: Electrochemical water splitting is crucial for hydrogen production, and improving the hydrogen separation rate from the electrode is essential for enhancing water electrolyzer performance. However, issues such as air bubble adhesion to the electrode plate hinder the process. Therefore, a methodology to investigate the two-phase flow within the electrolyzer is in high demand. This study proposes using a microfluidic system as a simulator for the electrolyzer and optimizing the two-phase flow by manipulating the micro-structure of the flow.
Article
Energy & Fuels
Shuo Han, Yifan Yuan, Mengjiao He, Ziwen Zhao, Beibei Xu, Diyi Chen, Jakub Jurasz
Summary: Giving full play to the flexibility of hydropower and integrating more variable renewable energy is of great significance for accelerating the transformation of China's power energy system. This study proposes a novel day-ahead scheduling model that considers the flexibility limited by irregular vibration zones (VZs) and the probability of flexibility shortage in a hydropower-variable renewable energy hybrid generation system. The model is applied to a real hydropower station and effectively improves the flexibility supply capacity of hydropower, especially during heavy load demand in flood season.
Article
Energy & Fuels
Zhen Wang, Kangqi Fan, Shizhong Zhao, Shuxin Wu, Xuan Zhang, Kangjia Zhai, Zhiqi Li, Hua He
Summary: This study developed a high-performance rotary energy harvester (AI-REH) inspired by archery, which efficiently accumulates and releases ultralow-frequency vibration energy. By utilizing a magnetic coupling strategy and an accumulator spring, the AI-REH achieves significantly accelerated rotor speeds and enhanced electric outputs.
Article
Energy & Fuels
Yi Yang, Qianyi Xing, Kang Wang, Caihong Li, Jianzhou Wang, Xiaojia Huang
Summary: In this study, a novel hybrid Quantile Regression (QR) model is proposed for Probabilistic Load Forecasting (PLF). The model integrates causal dilated convolution, residual connection, and Bidirectional Long Short-Term Memory (BiLSTM) for multi-scale feature extraction. In addition, a Combined Probabilistic Load Forecasting System (CPLFS) is proposed to overcome the inherent flaws of relying on a single model. Simulation results show that the hybrid QR outperforms traditional models and CPLFS exceeds the best benchmarks in terms of prediction accuracy and stability.
Article
Energy & Fuels
Wen-Jiang Zou, Young-Bae Kim, Seunghun Jung
Summary: This paper proposes a dynamic prediction model for capacity fade in vanadium redox flow batteries (VRFBs). The model accurately predicts changes in electrolyte volume and capacity fade, enhancing the competitiveness of VRFBs in energy storage applications.
Article
Energy & Fuels
Yuechao Ma, Shengtie Wang, Guangchen Liu, Guizhen Tian, Jianwei Zhang, Ruiming Liu
Summary: This paper focuses on the balance of state of charge (SOC) among multiple battery energy storage units (MBESUs) and bus voltage balance in an islanded bipolar DC microgrid. A SOC automatic balancing strategy is proposed considering the energy flow relationship and utilizing the adaptive virtual resistance algorithm. The simulation results demonstrate the effectiveness of the proposed strategy in achieving SOC balancing and decreasing bus voltage unbalance.
Article
Energy & Fuels
Raad Z. Homod, Basil Sh. Munahi, Hayder Ibrahim Mohammed, Musatafa Abbas Abbood Albadr, Aissa Abderrahmane, Jasim M. Mahdi, Mohamed Bechir Ben Hamida, Bilal Naji Alhasnawi, A. S. Albahri, Hussein Togun, Umar F. Alqsair, Zaher Mundher Yaseen
Summary: In this study, the control problem of the multiple-boiler system (MBS) is formulated as a dynamic Markov decision process and a deep clustering reinforcement learning approach is applied to obtain the optimal control policy. The proposed strategy, based on bang-bang action, shows superior response and achieves more than 32% energy saving compared to conventional fixed parameter controllers under dynamic indoor/outdoor actual conditions.