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
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)
Article
Thermodynamics
Feng Jin, Dewen Yuan, Deqi Chen, Lian Hu, Yanping Huang, Shanshan Bu
Summary: An experimental investigation was conducted to explore the heat transfer performance of supercritical CO2 in the mini channels of a zigzag printed circuit heat exchanger (PCHE). The results showed that the heat transfer coefficient was higher near the pseudocritical region and was significantly influenced by the mass flux and pressure, while the effect of inlet temperature was relatively small. Furthermore, four new cooling heat transfer correlations were proposed and compared, considering the effect of velocity change and cross-sectional thermophysical property variation on heat transfer performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
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
Muhammed Saeed, Ahmad Ali Awais, Abdallah S. Berrouk
Summary: The study suggests that choosing smaller design point values for CO2 channel mass flow rates can significantly reduce pressure losses, but may result in undesirable temperature profiles; higher channel mass flow rates can avoid pinch points in the precooler, but lead to compact designs with poor hydraulic performance; using a sandwiched channel configuration can substantially improve the hydraulic performance of the cold side without affecting the thermal characteristics of the precooler.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Soheila Riahi, Martin Belusko, Tim Lau, Ross Flewell-Smith, Michael Evans, Frank Bruno
Summary: This study compared the hydrothermal performance of different channel types and configurations and found the optimal design for a printed circuit heat exchanger (PCHE) using computational fluid dynamics. By validating the model with experimental conditions, the researchers determined the best channel combination and operating parameters to enhance the power generation effectiveness of concentrated solar power plants.
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 thermal-hydraulic characteristics of the zigzag channel printed circuit heat exchanger (PCHE) using for precooler in the supercritical CO2 Brayton cycle. The results show that the heat transfer performance and flow resistance of the PCHE greatly vary with the zigzag angle and bend radius. There is a high correlation between separated flow and friction factor. The optimal structure of the PCHE differs between regions near and away from the pseudo-critical.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Thermodynamics
Dandan Yin, Yunlong Zhou, Xintian Guo, Di Wang
Summary: This paper numerically studies and compares the thermal-hydraulic characteristics of CO2 and CO2/propane mixtures in wavy printed circuit plate heat exchangers (PCHE). The addition of propane improves the flow and heat transfer performance of the wavy PCHE. New thermal-hydraulic correlations are proposed for these mixture-mixture wavy PCHEs, with prediction deviations of ±4% for the Nusselt number and ±2% for the Fanning coefficient.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Yiming Wang, Gongnan Xie, Huaitao Zhu, Han Yuan
Summary: This study constructed an ammonia absorption-reheat supercritical carbon dioxide Brayton combined cycle and analyzed its thermodynamic performance. The optimized combined cycle achieved high energy and exergy efficiencies under controlled freezing-point storage condition and air-conditioning refrigeration condition.
Article
Thermodynamics
Alon Katz, Shaun R. Aakre, Mark H. Anderson, Devesh Ranjan
Summary: An ASME code compliant heat exchanger was manufactured for testing different working fluids under various flow conditions to investigate heat transfer and friction characteristics. The study found that using a zig-zag channel geometry between high-temperature helium and supercritical CO2 enables exploration of the impact of working fluids on heat exchanger performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Yunlong Zhou, Dandan Yin, Xintian Guo, Cunlin Dong
Summary: The study indicates that CO2/propane mixtures as heat transfer fluids exhibit lower pressure loss and higher heat transfer coefficients. The increase in propane molar fraction decreases the fanning friction factor and increases the Nusselt number.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Yunlong Zhou, Dandan Yin, Xintian Guo
Summary: This paper studies the thermal-hydraulic properties of mixture-molten salt printed circuit heat exchangers (PCHEs) in the Brayton cycle under different operating conditions. The results show that the cold fluid temperature changes when the mass fraction of butane, propane, and xenon changes. Butane and propane can reduce pressure loss in the cold channel, with butane having the most significant effect. New correlations are proposed for the flow and heat transfer performance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Muhammad Saeed, Abdallah S. Berrouk, Yasser F. Al Wahedi, Munendra Pal Singh, Ibragim Abu Dagga, Imran Afgan
Summary: This study focuses on enhancing the overall thermo-hydraulic performance of a C-shaped printed circuit heat exchanger using Machine Learning algorithms. The results demonstrate the effectiveness of the optimized solution through comparison with other geometries.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Chemistry, Physical
Xin Wang, Wanting Xu, Bo Xu, Cheng Xiong, Shuai Guo, Zhenqian Chen
Summary: This study proposed a method to assess the heat transfer performance of printed circuit heat exchangers (PCHE) based on temperature and pressure. The results showed that PCHE achieved better heat transfer performance when the critical index was near 1. Additionally, the total and hot-side heat transfer coefficients for SCO2-Water PCHE were higher than that of SCO2-SCO2 PCHE, and they increased with increasing cold-side Reynolds number. The study also found that the entropy generation rate for heat transfer had a larger effect on irreversibility compared to the entropy generation rate for viscosity.
JOURNAL OF SUPERCRITICAL FLUIDS
(2022)
Review
Chemistry, Physical
Alicia Bayon, Alberto de la Calle, Krishna Kamol Ghose, Alister Page, Robbie McNaughton
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Review
Chemistry, Physical
Dia Milani, Ali Kiani, Robbie McNaughton
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Letter
Pediatrics
Haiko Kurt Jahn, Ingo Henry Jahn, Damian Roland, Wilhelm Behringer, Mark Lyttle
Article
Pediatrics
Haiko Kurt Jahn, Ingo Henry Johannes Jahn, Damian Roland, Wilhelm Behringer, Mark Lyttle
Summary: The study found that the use of electronic prescribing and aids in pediatric emergency care is not yet widespread, with many physicians still reluctant to use them. The penetration rate of the British National Formulary app is relatively high, indicating success of digital policies and strategies, but barriers still need to be overcome.
Correction
Engineering, Aerospace
Augusto F. Moura, Nicholas Gibbons, Vincent Wheatley, Timothy McIntyre, Ingo Jahn
Article
Engineering, Aerospace
Gaetano M. D. Currao, Liam P. McQuellin, Andrew J. Neely, Sudhir L. Gai, Sean O'Byrne, Fabian Zander, David R. Buttsworth, Jack J. McNamara, Ingo Jahn
Summary: This study discusses the design, measurement, and simulation of an oscillating shock-wave/boundary-layer interaction on a flat plate at Mach 5.8. Results show that transition of the boundary layer typically occurs downstream of the separated region for both static and dynamic experiments, with delayed complete transition to fully turbulent boundary layer due to favorable pressure gradient induced by the impinging expansion wave.
Article
Thermodynamics
Dia Milani, Minh Tri Luu, Scott Nelson, Hanan Mohsin, Yiqing Liu, Graeme Puxty, Robbie McNaughton, Ali Abbas
Summary: This study introduces an advanced thermodynamic analysis to design a solar stripper (So-St) field for post-combustion carbon capture (PCC) plant. By optimizing the design protocol, the heat transfer efficiency is enhanced and a detailed design process for a representative case-study is provided.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Pediatrics
Haiko Kurt Jahn, Ingo Henry Johannes Jahn, Wilhelm Behringer, Mark D. Lyttle, Damian Roland
Summary: There is a clear trend towards digitalization in the healthcare sector, with widespread use of medical apps, instant messaging, and smartphone photography in pediatric emergency care. Most physicians use medical apps on their personal devices, especially national formulary apps. Concerns about patient confidentiality exist, indicating a need for cautious use of mobile apps and instant messaging services.
EUROPEAN JOURNAL OF PEDIATRICS
(2021)
Article
Engineering, Aerospace
Augusto F. Moura, Nicholas Gibbons, Vincent Wheatley, Ingo Jahn
Summary: Oxygen enrichment significantly increases combustion efficiency in scramjet engines, without significantly altering the overall turbulent combustion, which is distributed over a wide range of regimes.
Article
Engineering, Multidisciplinary
Jianhui Qi, Jinliang Xu, Kuihua Han, Ingo H. J. Jahn
Summary: There is a growing interest in supercritical CO2 and organic Rankine cycles for their ability to achieve higher thermodynamic efficiency. However, the thermodynamic properties of non-ideal gases in these cycles may critically affect the flow properties, necessitating the research of non-ideal compressible fluid dynamics (NICFD). This study presents a new approximation Riemann solver in OpenFOAM for NICFD, which can accurately predict fluid flows with NICFD.
ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
(2022)
Article
Engineering, Mechanical
Peter Collen, Luke J. Doherty, Suria D. Subiah, Tamara Sopek, Ingo Jahn, David Gildfind, Rowland Penty Geraets, Rowan Gollan, Christopher Hambidge, Richard Morgan, Matthew McGilvray
Summary: The T6 Stalker Tunnel is a multi-mode, high-enthalpy, transient ground test facility in the UK. It combines components from other tunnels to operate as a shock tube, reflected shock tunnel, or expansion tube. The experimental data obtained show high-quality test flows with enthalpy range from 2.7MJkg(-1) to 115.0MJkg(-1).
EXPERIMENTS IN FLUIDS
(2021)
Article
Thermodynamics
Phillip Swann, Ingo Jahn, Hugh Russell
Summary: This paper presents experimental data and analysis on the heat transfer of supercritical carbon dioxide under Taylor-Couette-Poiseuille flow. The results show that the heat transfer of supercritical carbon dioxide is significantly higher than that of ideal gases, and the change in fluid properties near the critical point and tangential energy transport have important influences on heat transfer.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Mechanics
K. C. Tapinou, V Wheatley, D. Bond, Ingo Jahn
Summary: This study computationally investigates the effect of different interface types on the plasma Richtmyer-Meshkov instability (RMI) and finds significant differences in the evolution of different types of interfaces in the multi-fluid plasma (MFP) model compared to single-fluid models. Thermal and species interfaces show the most severe response to shock acceleration, while the evolution of isotope interfaces is restrained. The severity of the MFP RMI is determined by the density ratio across the initial interface in the electron fluid.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Engineering, Aerospace
Sholto O. Forbes-Spyratos, Michael K. Smart, Michael P. Kearney, Alexander D. T. Ward, Ingo H. Jahn
Summary: The integration of high-speed airbreathing engines into small satellite launchers improves cost efficiency and turnaround times by allowing for the reuse of certain stages. Designing a trajectory for this type of launch system is challenging due to competing performance drivers and design constraints. This study uses the pseudospectral method to optimize the trajectory of a partially airbreathing rocket-scramjet-rocket multistage launch system. The findings suggest that the scramjet stage can achieve fly-back to its initial launch site, but ignition of the scramjet engines during return flight is an important consideration in trajectory design.
JOURNAL OF SPACECRAFT AND ROCKETS
(2023)
Article
Physics, Fluids & Plasmas
K. C. Tapinou, V. Wheatley, D. Bond, I. Jahn
Summary: The Richtmyer-Meshkov instability (RMI) can be caused by various factors and is influenced by elastic collisions in plasma, which can be accurately modeled by a multi-fluid plasma (MFP) model. MFP simulations have revealed some phenomena but further investigation is needed.
PHYSICS OF PLASMAS
(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)