Article
Thermodynamics
M. P. Vasilev, R. Sh Abiev, R. Kumar
Summary: A computational simulation was conducted to compare the performance of different types of microchannel heat sink models equipped with circular pin fins, finding that thermal resistance largely depends on pin height and the optimal pin placement step also varies for different pin heights.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Mukesh Kumar Sahu, M. M. Matheswaran, Pardeep Bishnoi
Summary: The experimental investigation on artificially roughened solar air heaters showed that the arc-shape wire with apex-upstream flow SAH outperformed other configurations in terms of thermal efficiency. It significantly enhanced the thermal performance under the operating parameters studied.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Qianci Mo, Xishan Zhu, Chenquan Deng, Shuhai Cen, Haibo Ye, Chunqiang Wang, Wei Lu, Xiaojun Chen, Xingsu Lin
Summary: Based on the performance test data of bagasse boilers in Guangxi Zhuang Autonomous Region, China, the energy analysis of the boilers was conducted. The results showed that the average thermal efficiency was 86.75%, and a large proportion of samples did not meet the limited value requirements. The heat loss of the boilers was mainly caused by the flue gases. Further simulation revealed that decreasing bagasse moisture content and excess air ratio, as well as increasing oxygen concentration, would significantly improve the thermal efficiency of the boilers. In addition, achieving the target thermal efficiency level would result in substantial reductions in bagasse consumption and carbon dioxide emissions, contributing to energy conservation and emission reduction.
Article
Green & Sustainable Science & Technology
Yu Shi, Qiliang Cui, Xianzhi Song, Shaomin Liu, Zijiang Yang, Junlan Peng, Lizhi Wang, Yanchun Guo
Summary: The aquifer thermal energy storage (ATES) system is an efficient method to address the energy supply-demand gap. Heat storage and preservation abilities play a crucial role in the success of ATES projects. However, previous studies have mainly focused on heat storage and recovery, neglecting the heat preservation ability of aquitards. Additionally, the effects of key factors on heat losses into aquitards and the appropriate selection of reservoirs for heat storage remain unclear. This study comprehensively evaluates ATES thermal performance by defining heat loss efficiency, analyzing the effects of key factors, and recommending optimal reservoirs for heat storage.
Article
Energy & Fuels
Longxia Ma, Fenghao Wang, Zeyuan Wang, Zhihua Wang, Sheng Zhang, Yongjun Sun
Summary: This study proposed a novel air source heat pump system with coupled liquid-storage and gas separator to prevent frost on the heat pump. The proposed system delayed frosting by 30 minutes and shortened defrosting time by 72 seconds compared to the original system.
Article
Thermodynamics
Xin Shen, Yuling Zhai, Wenjie Guo, Wenzhe Chen, Hua Wang
Summary: This study proposes four novel arrangements of microchannels with sharkskin-inspired bionic ribs to enhance heat transfer and reduce pressure drop. The results show that microchannels with staggered rib positions perform the best overall.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Thermodynamics
Fletcher Carlson, Jane H. Davidson
Summary: Thermal energy storage for nuclear power can enhance flexibility of low carbon baseload power plants and facilitate greater use of renewable energy sources. Comparison of different integration approaches in a parametric study provides insights on the technical performance and cost efficiency, with configurations showing varying effectiveness in terms of energy production ratio and peaking power capabilities.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Physics, Applied
Ludovico Tesser, Robert S. Whitney, Janine Splettstoesser
Summary: Hot-carrier solar cells aim to extract carriers from photogenerated energy before energy loss occurs in conventional solar cells, leading to higher energy conversion efficiency. This study introduces a quantum transport model to simulate carrier thermalization, relaxation, and recombination using Buttiker probes, and investigates the performance of hot-carrier solar cells with nonequilibrium energy distributions. By analyzing charge and heat transport, partial efficiencies for different loss processes and carrier extraction are introduced to evaluate the power output and efficiency of hot-carrier solar cells. The results show that working with a nonequilibrium energy distribution has the potential to improve power output and efficiency, and a boxcar-shaped transmission for carrier extraction maximizes efficiency at any given output power when the distribution is thermal.
PHYSICAL REVIEW APPLIED
(2023)
Article
Engineering, Multidisciplinary
R. Raveendra Nath, K. Hemachandra Reddy, C. Vijaya Bhaskar Reddy
Summary: The study introduces parallel streams in the Goswami cycle to improve performance, resulting in consistently higher output compared to the conventional cycle. The thermal efficiency and exergy efficiency of the modified cycle show different results compared to the Goswami cycle.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Review
Environmental Sciences
Dhanasingh Sivalinga Vijayan, Arvindan Sivasuriyan, Parthiban Patchamuthu, Revathy Jayaseelan
Summary: The thermal performance of civil structures is crucial in civil engineering and architecture, impacting residents' comfort levels and energy efficiency. Designing buildings according to thermal comfort and reducing carbon emissions, air flows, and energy consumption is essential. Different types of buildings, including residential, commercial, and educational structures, were analyzed for their thermal performance in various climatic conditions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Thermodynamics
Khaled A. Naeim, Ahmed A. Hegazi, Mohamed M. Awad, Salah H. El-Emam
Summary: The enthalpy-entropy approach was used to model the gas turbine cycle and study the effects of ambient conditions on the output parameters. The results showed that changes in temperature, humidity, and pressure had impacts on the power, efficiency, and fuel consumption of the turbine.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Alessio Sapienza, Vincenza Brancato, Yuri Aristov, Salvatore Vasta
Summary: In this study, plastic adsorbent heat exchangers were developed using 3D printing technology and experimentally tested for adsorption cooling applications. Results showed that the plastic adsorbers are competitive with metallic ones in terms of both thermodynamic and dynamic performance, with significant mass reduction and the ability to manufacture complex geometries. Under the tested operating conditions, the plastic adsorbers delivered a specific cooling power of 1.88-2.40 kW per kg of dry sorbent, while metallic adsorbers reached 2.34 kW/kg.
APPLIED THERMAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Andrea Frazzica, Valeria Palomba, Belal Dawoud
Summary: This study aimed to analyze the thermodynamics of different working pairs in adsorption heat transformers for low-temperature waste heat upgrade. The results showed the key role of internal heat recovery and temperature gradient in improving the overall performance of the system.
APPLIED SCIENCES-BASEL
(2021)
Article
Computer Science, Information Systems
Shizhong Zhang, Faraz Ahmad, Haseeb Ali, Sadiq Ali, Kareem Akhtar, Nisar Ali, Mohamed Badran
Summary: Traditional cooling technologies are not suitable for cooling electronic chips due to their small size and high heat generation. Microchannel heat sink (MCHS) is a promising option for better cooling performance. This study investigates the hydrothermal performance of MCHS with novel trefoil shape ribs. The results show that adding trefoil ribs to the walls of smooth microchannels significantly improves their thermal performance, although at the cost of increased pressure. The configuration with side wall trefoil ribs (MC-SWTR) has the highest thermal enhancement factor and is the most superior among all considered trefoil rib configurations.
Article
Green & Sustainable Science & Technology
Elumalai Vengadesan, Pathinettampadian Gurusamy, Ramalingam Senthil
Summary: A novel flat surface receiver with square cross-sectioned tubular fins is introduced to improve the thermal performance of a parabolic dish collector. Real-time investigation shows that with increasing water flow rate, the maximum temperature difference decreases and the time of water boiling is delayed. The receiver achieves high thermal and exergy efficiencies and has a lower cost per kWh of useful energy compared to coal power plants.
Article
Thermodynamics
J. H. Xie, H. C. Cui, Z. C. Liu, W. Liu
Summary: This study investigates the heat transfer and flow characteristics of helical micro fin tubes (HFT) through numerical simulation, revealing the significant impact of micro fin height, helical angle, and number of starts on overall performance, with a strong mutual coupling between them. Additionally, an optimal solution for HFT geometrical parameters is obtained using the exergy destruction minimization principle, artificial neural network, and genetic algorithm, showing a sensible balance between exergy destruction and better thermal-hydraulic performance (PEC = 1.73).
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
H. C. Cui, J. H. Xie, R. Z. Zhao, M. Z. Wang, Z. C. Liu, W. Liu
Summary: A novel jet impingement cooling concept was proposed for hotspot-targeted, energy efficient cooling of non-uniform heat generation electronics. The effects of different structural parameters on heat transfer and resistance performance were investigated through numerical simulations.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Mingliang Li, Yanan Zhao, Rui Long, Zhichun Liu, Wei Liu
Summary: A complete transient mathematical model is developed to optimize the bed configuration in a metal foam packed bed for enhanced production of cooling and water in an adsorption-based desalination and cooling system. The results show that the optimal system with a metal porosity of 0.8 and bed porosity of 0.25 can achieve a cooling effect of 8.74 kW and a potable water production of 300 m3 per day. Additionally, the impact of advanced asymmetric cycle conditions on system throughput is explored, leading to improvements in cooling and water production.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Green & Sustainable Science & Technology
Gen Ou, Peng Liu, Zhichun Liu, Wei Liu
Summary: This research proposes an enhanced parabolic trough receiver with a novel single conical strip insert and investigates its performance through numerical simulations. The results show that the conical strip improves the temperature uniformity of the absorber tube and the actual efficiency, while reducing entropy generation and exergy destruction.
Article
Engineering, Multidisciplinary
Shi ChunYu, Yu MinJie, Liu Wei, Liu ZhiChun
Summary: This study optimized the design profile of corrugated tubes using machine learning techniques, finding that multi-objective optimization can transition the shape of corrugated tubes from double-trough to single-trough, striking a balance between comprehensive performance and thermal efficiency. The optimal solution increases flow resistance while decreasing thermal performance at specific Reynolds numbers.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2022)
Article
Energy & Fuels
Song He, Zhengyuan Ma, Weizhong Deng, ZiKang Zhang, Ziqi Guo, Wei Liu, Zhichun Liu
Summary: This paper proposes a flat plate loop heat pipe (LHP) with dual evaporators for thermal management of multiple heat sources. The system is validated through start-up tests and tests with variable heat loads to evaluate its performance and operational stability.
Article
Thermodynamics
Zikang Zhang, Haichuan Cui, Shuaicheng Zhao, Runze Zhao, Tong Wu, Zhichun Liu, Wei Liu
Summary: This study presents an intensive investigation of a flat-plate evaporator loop heat pipe (LHP) using experimental and simulation methods. The vapor leakage problem was solved by filling the assembly clearance with epoxy glue, and the operating performance of the flat-plate LHP system was verified. An efficient 3-D CFD computational model was built to simulate the heat and mass transfer process in the evaporator. The model exhibited high accuracy with an error less than 10.29%.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Mingliang Li, Yanan Zhao, Rui Long, Zhichun Liu, Wei Liu
Summary: The study analyzes the impact of non-adsorbable air on the performance of adsorption-based desalination and cooling systems and proposes a finned-tube bed with branched fins to improve system performance. By using machine learning and genetic algorithm, the optimal fin configuration is determined, resulting in a 24.6% increase in cooling power and a 20.4% increase in daily water production for the system.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Environmental
Lu Wang, Yanan Zhao, Xi Chen, Rui Long, Zhichun Liu, Wei Liu
Summary: Reverse electrodialysis (RED) is investigated for energy conversion performance of sodium salt solutions with different ion valence ratios in symmetric and asymmetric pH configurations. Increasing pH weakens performance for 1:1 and 1:3 salts in symmetric pH configuration, while for 1:2 salt, the power density and energy conversion efficiency initially increase and then decrease. In asymmetric pH configuration, increasing pH of low concentration solution reduces power density and energy conversion efficiency, while increasing pH of high concentration solution decreases and then increases power and efficiency for 1:1 salt, increases and then decreases for 1:2 salt, and decreases overall for 1:3 salt due to OH- effects.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Thermodynamics
Zikang Zhang, Runze Zhao, Shuaicheng Zhao, Hao Zou, Zhichun Liu, Xiaobing Luo, Wei Liu
Summary: Loop heat pipe is an efficient electronic thermal management system that combines two-phase heat transfer and passive driving mechanisms, providing high performance, reliability, and robustness. A two-phase pump-assisted loop heat pipe with two evaporators in parallel was manufactured to enhance heat transfer performance, increase transport distance, and accommodate multiple heat sources. Tests showed smooth operation with minimal interaction between the two evaporators, with evaporator 2 outperforming evaporator 1 due to a higher porosity resulting in more sufficient evaporation liquid. Increasing heat load and heat sink temperature reduced the evaporator thermal resistance.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Thermodynamics
Yancong Qiao, Wei Liu, Zhichun Liu
Summary: This study investigated the thermal-hydraulic and thermodynamic performance of a discrete inclined ribs enhanced bend tube based on a designed Diamond channel for the thermal protection of hypersonic aircraft. Numerical investigations were conducted for different models, and it was found that a double-symmetrical longitudinal swirl was generated under a single upper and lower arrangement, resulting in the best cooling performance. The effects of four geometrical parameters were explored, and it was observed that the inner wall temperature decreased, the Nusselt number and friction factor increased, and the efficiency evaluation criterion reached a certain range. The optimal solution was determined using the TOPSIS method, and a design variable for ease of engineering was also proposed.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Yongle Tang, Xuewei Zhang, Zhichun Liu
Summary: The cooling system is the highest energy-consuming auxiliary equipment in a data center, accounting for 30 to 50% of the total energy consumption. Improving the heat exchange efficiency at the chip level is crucial for reducing energy consumption. Compared to other cooling solutions, flat loop heat pipe (FLHP) is considered as a better chip-level cooling solution for data centers due to its high heat transfer efficiency and variability, as well as the ability to avoid liquid-related operation risks.
Article
Multidisciplinary Sciences
Yifan Zhang, Ji Li, Zikang Zhang, Wei Liu, Zhichun Liu
Summary: The study investigates the enhancement of thermo-osmotic energy conversion (TOEC) by applying negative pressure to the feed liquid. Theoretical calculations and lab-scale experiments demonstrate that negative pressure can significantly increase the efficiency and power density of the TOEC system under certain temperature and pressure difference conditions.
Article
Thermodynamics
Yifan Zhang, Yongxiang Fan, Zhichun Liu, Wei Liu
Summary: This study designs and investigates the flow and heat transfer performance of two-phase minichannel cold plates with a 10 kW heat load. Numerical simulation is used to guide the optimization of the structure at both the channel and whole levels, which is in line with the experimental results. An abnormal phenomenon of temperature increase with flow rate is observed and explained by a change in boiling point. The impact of channel structure, fluid characteristics, flow uniformity, and pressure resistance on cold plate temperature and pressure drop are explored. The fusiform channel outperforms the rectangular channel and refrigerant R1234ze(E) performs better than R1233zd(E) in the cold plate. Methods for improving flow uniformity and pressure drop are explained and tested. The study provides a reference for designing high-power two-phase cold plates.
APPLIED THERMAL ENGINEERING
(2023)
Review
Energy & Fuels
Yuntao Zou, Zihui Lin, Dagang Li, Zhichun Liu
Summary: This paper provides a comprehensive review of the current research in health management of lithium-ion batteries, emphasizing the use of Artificial Neural Networks. It covers the distinctions between energy storage batteries and power batteries, composition and management of battery energy storage systems, evaluation metrics, open datasets, data preprocessing techniques, health feature extraction methods, battery health prediction approaches, and future prospects and challenges of using Artificial Neural Networks.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Hai Zhao, Puzhen Gao, Xiaochang Li, Ruifeng Tian, Hongyang Wei, Sichao Tan
Summary: This study numerically investigates the interaction between flow-induced vibration and forced convection heat transfer in a tube bundle. The results show that the impact of flow-induced vibration on heat transfer varies in different flow velocity regions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rohit Chintala, Jon Winkler, Sugirdhalakshmi Ramaraj, Xin Jin
Summary: The current state of fault detection and diagnosis for residential air-conditioning systems is expensive and not suitable for widespread implementation. This paper proposes a cost-effective solution by introducing an automated fault detection algorithm as a screening step before more expensive tests can be conducted. The algorithm uses home thermostats and local weather information to identify thermodynamic parameters and detect high-impact air-conditioning faults.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
A. Azimi, N. Basiri, M. Eslami
Summary: This paper presents a novel optimization algorithm for improving the water-film cooling system of photovoltaic panels, resulting in a significant increase in net energy generation.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Duc-Thuan Phung, Chin-Hsiang Cheng
Summary: In this study, a novel CFDMD model is used to analyze and investigate the behavior of thermal-lag engines (TLE). The study shows that the CFDMD model effectively captures the thermodynamic behavior of the working gas and the dynamic behavior of the engine mechanism. Additionally, the study explores the temporal evolution of engine speed and the influence of various parameters on shaft power and brake thermal efficiency. The research also reveals the existence of a thermal-lag phenomenon in TLE.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Haiying Yang, Yinjie Shen, Lin Li, Yichen Pan, Ping Yang
Summary: The purpose of this article is to find a measure to improve the interfacial thermal transfer of graphene/silicon heterojunction. Through molecular dynamics simulation, it is found that surface modification can significantly reduce the thermal resistance, thereby improving the thermal conductivity of the graphene/silicon interface.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Qiong Wu, Yancheng Wang, Haonan Zhou, Xingye Qiu, Deqing Mei
Summary: This article introduces a visible methanol steam reforming microreactor, which uses an optical crystal as an observation window and measures the reaction temperature in real-time using infrared thermography. The results show that under lower oxygen to carbon ratio conditions, the microreactor has a higher heating rate and a stable gradient in temperature distribution.
APPLIED THERMAL ENGINEERING
(2024)
Review
Thermodynamics
Giulia Manco, Umberto Tesio, Elisa Guelpa, Vittorio Verda
Summary: In the past decade, there has been a growing interest in studying energy systems for the combined management of power vectors. Most of the published works focus on finding the optimal design and operations of Multi Energy Systems (MES). However, for newcomers to this field, understanding how to achieve the desired optimization details while controlling computational expenses can be challenging and time-consuming. This paper presents a novel approach to analyzing the existing literature on MES, with the aim of guiding practical development of MES optimization. Through the discussion of six case studies, the authors provide a mathematical formulation as a reference for building the model and emphasize the impact of different aspects on the problem nature and solver selection. In addition, the paper also discusses the different approaches used in the literature for incorporating thermal networks and storage in the optimization of multi-energy systems.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xuepeng Yuan, Caiman Yan, Yunxian Huang, Yong Tang, Shiwei Zhang, Gong Chen
Summary: In this study, a multi-scale microgroove wick (MSMGW) was developed by laser irradiation, which demonstrated superior capillary performance. The surface morphology and performance of the wick were affected by laser scan pitch, laser power, repetition frequency, and scanning speed. The MSMGW showed optimal capillary performance in alumina material and DI water as the working fluid.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Maofei Mei, Feng Hu, Chong Han
Summary: This paper proposes an effective local search method based on detection of droplet boundaries for understanding the dynamic process of droplet growth during dropwise condensation. The method is validated by comparing with experimental data. The present simulation provides an effective approach to more accurately predict the nucleation site density in future studies.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rahul Kumar Sharma, Ashish Kumar, Dibakar Rakshit
Summary: The study explores the use of phase change materials (PCM) as a retrofit with Heating Ventilation and Air-conditioning systems (HVAC) to reduce energy consumption and improve air quality. By incorporating PCM with specific thickness and fin configurations, significant energy savings can be achieved in comparison to standard HVAC systems utilizing R134a. This research provides policymakers with energy-efficient and sustainable solutions for HVAC systems to combat climate change.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Zhenhua Ren, Xiangjin Meng, Xingang Qi, Hui Jin, Yunan Chen, Bin Chen, Liejin Guo
Summary: This paper investigates the heat transfer mechanism and factors influencing thermal radiation in the process of supercritical water gasification (SCWG) of coal, and proposes a comprehensive numerical model to simulate the process. Experimental validation results show that thermal radiation accounts for a significant proportion of the total heat exchange in the reactor and a large amount of radiant energy exists in the important spectral range of supercritical water. Enhancing radiative heat transfer can effectively increase the temperature of the reaction medium and the gasification rate.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Mauro Abela, Mauro Mameli, Sauro Filippeschi, Brent S. Taft
Summary: Pulsating Heat Pipes (PHP) are passive two-phase heat transfer devices with a simple structure and high heat transfer capabilities. The actual unpredictability of their dynamic behavior during startup and thermal crisis hinders their large-scale application. An experimental apparatus is designed to investigate these phenomena systematically. The results show that increasing the number of evaporator sections and condenser temperature improves the performance of PHP. The condenser temperature also affects the initial liquid phase distribution and startup time.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Ke Gan, Ruilian Li, Yi Zheng, Hui Xu, Ying Gao, Jiajie Qian, Ziming Wei, Bin Kong, Hong Zhang
Summary: A 3-dimensional enhanced heat pipe radiator has been developed to improve heat dissipation and temperature uniformity in cooling high-power electronic components. Experimental results show that the radiator has superior heat transfer performance compared to a conventional aluminum fin radiator under different heating powers and wind speed conditions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xinyi Zhang, Shuzhong Wang, Daihui Jiang, Zhiqiang Wu
Summary: This study focuses on recovering waste heat from blast furnace slag using dry centrifugal pelletizing technology. A comprehensive two-dimensional model was developed to analyze heat transfer dynamics and investigate factors influencing heat exchange efficiency. The findings have important implications for optimizing waste heat recovery and ensuring safe operations.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xincheng Wu, An Zou, Qiang Zhang, Zhaoguang Wang
Summary: The boosting heat generation rate of high-performance processors is challenging traditional cooling techniques. This study proposes a combined design of active jet intermittency and passive surface modification to enhance heat transfer.
APPLIED THERMAL ENGINEERING
(2024)
