Article
Energy & Fuels
Mohammad Ramin Daneshparvar, Reza Beigzadeh
Summary: This study models the thermal-hydraulic performance of a shell-and-tube heat exchanger with helical baffles using computational fluid dynamics. The effects of baffle pitch and baffle angle on heat transfer coefficient and pressure drop were investigated. The modeling results were validated with experimental data and used to optimize the geometric parameters of the helical baffles using a multi-objective genetic algorithm.
Article
Thermodynamics
Xin Gu, Menghong Li, Wei Gao, Qiming Shi
Summary: A full-section periodic model of torsional flow heat exchanger with orthogonal elliptical tubes has been established, and the heat and flow transfer on the tube and shell sides have been numerically simulated. Compared with round tubes, the orthogonal elliptical tubes showed improved convective heat transfer coefficient and comprehensive performance. On the shell side, the heat transfer coefficient increased while the pressure drop decreased, resulting in improved comprehensive performance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Nicola Bianco, Andrea Fragnito, Marcello Iasiello, Gerardo Maria Mauro, Luigi Mongibello
Summary: Latent heat thermal storage based on phase change material (PCM) in shell-and-tube heat exchangers can reduce power consumption of air conditioning systems. By optimizing the charging/discharging time of PCM and the operating conditions of the chiller, better performance can be achieved. Experimental validation shows that the optimal solution leads to a reduction in the inlet temperature by 1.25℃ and a maximum utilization of PCM by 40% of the initial amount. Further optimization results in a shell diameter reduction of 12 cm to exploit 72% of the PCM potential.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Emad M. S. El-Said, Ammar H. Elsheikh, Hamed R. El-Tahan
Summary: This paper presents a numerical investigation on shell-and-tube heat exchanger with three configurations of novel segmental curved baffles for thermohydralic performance analysis and enhancement. The results show that the CB3 configuration results in a significant augmentation of the heat exchanger performance compared with the others two configurations for all investigated cases.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Liang-Yu Chen, Vincentius Surya Kurnia Adi, Rosalia Laxmidewi
Summary: Traditionally, the design of shell and tube heat exchangers is focused on minimizing costs and pressure drop. However, this approach may overlook equipment limitations and uncertain disturbances, leading to design inefficiency and improper operation. This study proposes a rigorous design strategy for shell and tube heat exchangers using the flexibility index analysis method. The genetic algorithm is employed for optimization, while the flexibility index is used to quantify uncertain factors and evaluate operability. The incorporation of the flexibility index in the design workflow improves operability and reduces costs.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Engineering, Aerospace
Penghua Liu, Hongbo Han, Zewei Bao
Summary: In this study, a numerical model and multi-objective optimization method were developed to improve the power-to-weight ratio and reduce the air-side pressure drop of a fuel-air tube-in-tube helical coil heat exchanger. The optimized structural parameters were di,i = 1 mm, dh = 2.3 mm, and number of turns = 4.5, resulting in an increased power-to-weight ratio of 27.6 kW/kg and reduced air-side pressure drop of 255.7 kPa. The optimization led to a 5.34% increase in the power-to-weight ratio and a 50.8% reduction in the air-side pressure drop.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Thermodynamics
S. A. Marzouk, M. M. Abou Al-Sood, Magda K. El-Fakharany, Emad M. S. El -Said
Summary: This study presents a numerical modeling of shell and tube heat exchangers with various baffle configurations, and it was found that the hybrid and circular ring baffles have the most significant impact on improving thermal and hydraulic performance.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Engineering, Multidisciplinary
Mohamed A. Alnakeeb, Mahmoud A. Saad, Mohamed A. Hassab
Summary: Numerical study on thermal and hydraulic performance of a fin and flat tube heat exchanger with various aspect ratios revealed that the flat-tube aspect ratio has a significant effect on pressure drop and heat transfer per unit fan power. It is recommended to choose flat tubes with lower aspect ratios to reduce energy consumption and improve overall performance.
ALEXANDRIA ENGINEERING JOURNAL
(2021)
Article
Thermodynamics
Quanyu Gong, Chulin Yu, Wenqing Wang, Youqiang Wang
Summary: A novel approach to heat exchangers, featuring a continuous spiral baffle structure, was studied and analyzed for its flow field and thermal transfer characteristics. Increasing the entry speed on the shell pass resulted in a drop in fluid temperature, shrinkage of the low-temperature segment, and escalated resistance within the heat exchanger. Additionally, increasing the corrugated height and decreasing the corrugated pitch improved the overall heat transfer performance.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Ibrahim Kaya, Yasin Ust
Summary: This research introduces a method, Univariate Search Method 2 (USM2), that can solve the difficulties of multi-objective optimization for heat exchangers. By using a weighted sum approach and a single-objective optimization method, USM2 is able to find a better design range on the Pareto Front.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2021)
Article
Thermodynamics
Yuechao Liu, Genshan Jiang, Yanfeng Yang, Qian Kong, Yu Jiang
Summary: Strong sound can induce acoustic streaming and affect heat transfer around tubes. The sound pressure level changes the acoustic streaming velocity without altering the distribution. Low-frequency and high-intensity sound waves enhance heat transfer outside the tubes. The optimal incidence angle for the flow field is 34 degrees, while the optimal angle for heat transfer is 45 degrees in tube arrays.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Lingqin Meng, Jiaxin Liu, Jiaming Bi, Enver Doruk Ozdemir, Mehmet Haluk Aksel
Summary: In this paper, a simplified model of a plate heat exchanger (PHE) used in the cooling system of commercial electric vehicles (CEVs) was numerically analyzed and experimentally verified. A multi-objective genetic algorithm optimization (MOGAO) was implemented to optimize the structural configuration of the PHE, and the JF factor was proposed as a selection criterion. Numerical comparisons between the optimized model (OM1) and the original model were performed, showing that OM1 achieved better comprehensive performance with improved velocity and temperature.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Physics, Applied
Muhammad Habibullah, Muhammad Atif, Muhammad Arslan Khan, Fuad A. Awwad, Emad A. A. Ismail
Summary: This study conducts a detailed assessment of the thermal aspects and evaluation of steam surface condensers using a three-dimensional model and computational fluid dynamics simulations. The findings reveal a significant correlation between the condensation rate and factors such as the geometrical configuration, cooling water flow rate, and operational pressure of the condenser.
MODERN PHYSICS LETTERS B
(2023)
Article
Thermodynamics
Yuce Liu, Jian Wen, Simin Wang, Jiyuan Tu
Summary: A novel type of shell and tube heat exchanger with modified fold helical baffles and twisted oblate tubes (STHXsFBTB) is proposed and its thermal and hydraulic properties for water chiller systems are investigated in comparison with the traditional STHXsFB. The results show that STHXsFBTB has improved heat transfer performance, with factors such as screw pitch and tube diameter ratio, length width ratio, and cutting ratio influencing its performance.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Chemistry, Multidisciplinary
Liangxing Li, Haoxiang Zhao, Jiayuan Zhao, Xiangyu Li
Summary: Single-/multi-objective optimization based on genetic algorithm is employed to optimize the primary heat exchanger in a lead-cooled fast reactor. The results show significant improvement in irreversible loss, heat transfer, and hydraulic performance after optimization. This study is of great importance for the design of a primary heat exchanger.
APPLIED SCIENCES-BASEL
(2022)
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)