Article
Thermodynamics
Giovanni A. Longo, Simone Mancin, Giulia Righetti, Claudio Zilio
Summary: This paper presents the local heat transfer coefficients of R290 and R1270 boiling in a Brazed Plate Heat Exchanger (BPHE). A new test section was designed for measuring the local heat transfer coefficient in refrigerant two-phase heat transfer. The experimental results show that nucleate boiling is the governing heat transfer regime, and the correlations for nucleate boiling in BPHE are in good agreement with the experimental data.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2023)
Article
Thermodynamics
Ahmet Selim Dalkilic, Hatice Mercan, Guven Ozcelik, Somchai Wongwises
Summary: The study determined the number, geometry and dimensions of the fins using algorithms, conducted operational condition optimization and cost analysis, and investigated the effects of different types of nanofluids on heat transfer performance and cost.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Alessandro d'Adamo, Martino Diana, Giuseppe Corda, Antonio Cucurachi, Maria Cannio, Andrea Pellacani, Marcello Romagnoli, Enrico Stalio, Paolo E. Santangelo
Summary: The demand for innovative propulsion technologies in the mobility sector is increasing the burden on thermal management. Nanofluids have emerged as a promising solution to replace traditional coolants. However, assessing their effectiveness in terms of heat transfer enhancement and required pumping power in various flow regimes remains a challenge. An experiment comparing a conventional coolant and a TiO2-based nanofluid was conducted, and a model was developed to evaluate their performance. The model highlights the laminar flow regime as promising for the use of nanofluids and provides criteria for quantitative evaluation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Jeonggyun Ham, Junhyeok Yong, Ohkyung Kwon, Kyungjin Bae, Honghyun Cho
Summary: In order to improve the performance and miniaturization of the absorption system, a plate heat exchanger was used as a solution heat exchanger and its performance was accurately predicted. The study investigated the thermal performance of solution heat exchangers in a double-effect absorption system and developed and compared new correlations for Nu and Fanning friction factor. The results showed that the high-temperature solution heat exchanger had a higher hot-side Nu value (6.3-23.1) compared to the low-temperature solution heat exchanger (4.8-20.1). The developed Nu correlation (Nu = 0.273Re0.693Pr1/3) showed high accuracy with experimental results. A Fanning friction factor correlation of f = 1.601/Re0.123 was proposed.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Zhe Dong, Bowen Li, Junyi Li, Di Jiang, Zhiwu Guo, Xiaojin Huang, Zuoyi Zhang
Summary: This paper explores the synthesis and control of heat exchanger networks (HENs) in fossil, nuclear, and chemical plants, emphasizing the importance of HEN control for maintaining stable operation performance. A dynamic model of HEN is developed based on thermodynamics and directed graph analysis, and a passivity-based control approach is proposed to ensure global asymptotic stability with simple implementation. The designed control law is successfully applied to nuclear district heating systems, demonstrating satisfactory control performance in numerical simulations.
Article
Thermodynamics
Burhan Cuhadaroglu, Mustafa Suat Hacisalihoglu
Summary: This study experimentally analyzed the hydrodynamic and thermal performance of a plate heat exchanger using CuO nanofluid in a modeled heating system, finding that nanofluids can effectively improve heat conduction and heat exchanger effectiveness. A new correlation equation for CuO nanofluid's thermal performance was proposed, considering volume fraction as well as Reynolds and Prandtl numbers.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Review
Chemistry, Multidisciplinary
Ali Almertejy, Muhammad M. Rashid, Naser Ali, Salah Almurtaji
Summary: This article introduces the methods of using nanofluids to improve gas turbine efficiency, including experimental and numerical studies. The general principles governing turbines are described, and commonly used types of heat exchangers are introduced. The application of nanofluids in heat exchangers is reviewed.
Article
Thermodynamics
Wagd Ajeeb, Renato R. S. Thieleke da Silva, S. M. Sohel Murshed
Summary: This study investigates the performance of a compact gasketed plate heat exchanger using Al2O3 nanofluids. The experiment measured the thermophysical properties of the nanofluid samples and compared their performance with conventional heat transfer fluids. The results showed that increasing the concentration of nanoparticles improved heat transfer efficiency and energy efficiency.
APPLIED THERMAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Shang-Pang Yu, Yeou-Feng Lue, Tun-Ping Teng, Hsiang-Kai Hsieh, Chia-Cing Huang
Summary: The wet ball milling method was used to prepare different concentrations of carbon-based nanofluids, and it was found that the 0.05 wt% CBNFs exhibited the best overall system performance in heat exchange experiments.
APPLIED SCIENCES-BASEL
(2021)
Review
Chemistry, Multidisciplinary
Sujata Kalsi, Sunil Kumar, Anil Kumar, Tabish Alam, Dan Dobrota
Summary: This article provides an in-depth look at the latest developments in the field of nanofluids, covering everything from their synthesis techniques to their thermophysical characteristics. The advantages and disadvantages of nanofluids and their prospective uses in heat exchangers were also discussed. It has also been compared to how well nanofluids and conventional fluids function in heat exchangers.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Review
Chemistry, Physical
Sajjad Porgar, Hakan F. Oztop, Somayeh Salehfekr
Summary: Nanofluids have superior thermal and thermophysical properties compared to traditional fluids, and they are widely used in various industries. The use of nanofluids reduces energy consumption, improves fluid heat efficiency, and reduces the size and volume of equipment. This paper reviews the impact of nanoparticles on the thermophysical properties of fluids and the models used to measure the thermal conductivity of nanofluids. The results show that increasing the concentration of nanoparticles and temperature can enhance thermal conductivity, and non-spherical nanoparticles have a greater impact on the thermal conductivity of ionic fluids than spherical particles.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Materials Science, Multidisciplinary
Chengdong Xia, Shaohui Deng, Chengyuan Ni, Yingyu Ji, Wenhui Zheng, Jiqian Luo, Wei Xu, Weidong Li, Yong Pang
Summary: A high-strength brazable 4343/3003/6A02/3003 aluminum alloy laminar composite and its brazing-aging treatment process were investigated for lightweight heat exchangers. The composite exhibited an average maximum tensile strength of 298 MPa and a yield strength of 263 MPa after brazing-aging treatment, owing to the precipitation strengthening of nanoscale Mg2Si particles generated by the heat-treatable 6A02 layer. The effective hindrance for the diffusion of Mg elements into the brazing layer and surface by the 8% thickness ratio of the 3003 barrier layer contributed to its brazeability.
Article
Thermodynamics
Prudhvi Krishna Amburi, G. Senthilkumar, A. Nithya
Summary: The aim of this study is to enhance the thermal conductivity of magnesium oxide (MgO)/water and multi-walled carbon nanotubes (MWCNT)/water by incorporating copper oxide (CuO) nanoparticles. Two different nanofluids, 1% MgO + 99% water and 1% MWCNT + 99% water, were prepared using ultrasonication and their thermal conductivity was measured. CuO nanoparticles were then added to the nanofluids, resulting in increased thermal conductivity of 11.3% and 13.3% for MgO/water and MWCNT/water, respectively, at 30 °C. Similar improvements of 12.8% and 14.5% were observed at 40 °C. Furthermore, the enhancement of thermal conductivity was more pronounced at lower concentrations of nanoparticles.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Hadise Mehrarad, Mohammad Reza Sarmasti Emami, Komeil Afsari
Summary: In recent years, researchers have focused on technologies that can improve the performance of heat transfer devices, such as plate heat exchangers, in order to cope with the increasing energy consumption and the need for optimization. One solution is the use of nanoparticles in common fluids. However, there has been insufficient attention given to the application of multi-walled carbon nanotubes (MWCNT) in plate heat exchangers. This study investigates the thermal performance and flow characteristics of a brazed plate heat exchanger using MWCNT nanoparticles in a water/ethylene glycol cooling fluid. The results show that the nanofluid concentration of 0.05 wt% exhibits the highest stability, and at a hot fluid temperature of 55°C and a cold fluid volume flow rate of 23.4 l/min, the convection heat transfer coefficient and heat transfer rate increase by 20.97% and 34.3% compared to the base fluid. The Nusselt number, pressure drop, friction factor, and pumping power also increase with higher hot fluid temperature and cold fluid volume flow rate, with the nanofluid exhibiting increases of 94.45%, 11.25%, 12.87%, and 11.36% respectively compared to the base fluid. This study demonstrates better performance at high temperatures compared to similar studies.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
S. A. Marzouk, Ahmad Aljabr, Fahad Awjah Almehmadi, Saeed Alqaed, Maisa A. A. Sharaf
Summary: In this study, the performance of a plate heat exchanger is numerically investigated using tungsten carbide (WC) nanoparticles with water. The effect of nanofluid mass concentration on various parameters such as Nusselt number, friction factor, exergy efficiency temperature, velocity, and pressure distribution is analyzed. The results show that increasing the Reynolds number and nanofluid mass concentration can enhance the Nusselt number and reduce the friction factor. The streamlines and contours of the temperature, velocity, and pressure distribution provide credible interpretations for the movements of WC-water nanofluids and an noticed improvement in heat transfer.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(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)