Article
Thermodynamics
Carolina P. Naveira-Cotta, Jian Su, Paulo Lucena Kreppel Paes, Philippe R. Egmont, Rodrigo P. M. Moreira, Gabriel Caetano G. R. da Silva, Andre Sampaio Monteiro
Summary: This study investigated the impact of semi-circular zigzag-channel PCHE design parameters on heat transfer and pressure drop under high Reynolds numbers. Results showed that the zigzag angle was the main factor affecting the thermal-hydraulic performance, with smaller angles favoring heat transfer intensification.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Multidisciplinary Sciences
Feyyaz Arslan, Bulent Guzel
Summary: The study investigated the printed circuit heat exchanger in supercritical carbon dioxide cycles, achieving highly accurate heat exchanger designs through numerical and experimental analyses. The experimental and numerical results were in good agreement, confirming the effectiveness of the sub-heat exchanger model.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(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
Chemistry, Analytical
Yuxuan Ji, Kaixiang Xing, Kefa Cen, Mingjiang Ni, Haoran Xu, Gang Xiao
Summary: Printed circuit heat exchangers (PCHEs) are efficient in sCO(2) power cycles, but require balancing heat transfer and pressure drop losses. By designing different channel structures and introducing a sandwiched design, the heat transfer and flow resistance can be effectively balanced, leading to improved regenerative efficiency.
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
Energy & Fuels
Evan P. Reznicek, Ty Neises, Robert J. Braun
Summary: This study presents a techno-economic comparison of regenerators and recuperators in supercritical CO2 power cycles for CSP applications. Results show that printed circuit heat exchangers achieve the lowest levelized cost of energy (LCOE), unless extreme cost scenarios for regenerators and valves are realized. The study also emphasizes the importance of reducing CSP component costs.
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
Keyong Cheng, Jingzhi Zhou, Xiulan Huai, Jiangfeng Guo
Summary: Exergy analysis can improve the quality of energy in printed circuit heat exchangers. The study introduces experimental exergy analysis of a printed circuit heat exchanger used in a supercritical carbon dioxide Brayton cycle recuperator, showing that low Reynolds numbers and high inlet temperatures on the cold side have a positive impact on exergy efficiency. New correlations for Nusselt number and friction factor were developed based on the test results.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Sungkun Chung, Su Won Lee, Namhyeong Kim, Seong Min Shin, Moo Hwan Kim, HangJin Jo
Summary: This study investigates the thermal-hydraulic performances of straight and airfoil channels of printed-circuit heat exchanger (PCHE) for a nitrogen Brayton cycle recuperator. The results show that the airfoil PCHE has higher heat transfer performance and pressure drop compared to the straight PCHE. New correlations are developed to predict the experimental data for the airfoil PCHE. The comprehensive performance of the airfoil PCHE is found to be the highest among different channel configurations.
APPLIED THERMAL ENGINEERING
(2023)
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
Energy & Fuels
Cheng-Yen Chang, Wei-Hsin Chen, Lip Huat Saw, Arjay Avilla Arpia, Manuel Carrera Uribe
Summary: PCHE is a promising waste heat recovery technology that shows good thermal performance for low-temperature waste heat recovery, with factors such as inlet flow temperature and flow rate of the working fluid affecting its effectiveness. Comparisons with other PCHE designs suggest that the novel PCHE outperformed those with fewer layers of fins in terms of effectiveness.
Article
Thermodynamics
Ojasvin Arora, Kevin Fernandez Cosials, Rodolfo Vaghetto, Yassin A. Hassan
Summary: In this study, experimental measurements and numerical simulations have been conducted to investigate the performance of an airfoil-fin Printed Circuit Heat Exchanger (PCHE). The results show good agreement between the numerical simulations and experimental investigations, and these simulations can be used to study the velocity and pressure fields in the micro-channel geometry of the airfoil-fin PCHE. Additionally, they can provide insights into the correlation between friction factor and Reynolds number across different flow regimes, which is crucial for future heat exchanger design studies.
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
(2023)
Article
Thermodynamics
Huaitao Zhu, Gongnan Xie, Abdallah S. Berrouk, Sandro Nizetic
Summary: The study develops a simplified boiling temperature boundary condition (BTBC) to analyze the performance of printed circuit heat exchanger (PCHE) with semicircular channels. CFD is used to simulate fluid and heat flows in PCHE semicircular channels as a precooler in a combined supercritical CO2 Brayton/Organic Rankine cycle. The results compare the BTBC to heat flux boundary condition (HFBC) and evaluate the heat transfer correlations for SCO2 for both conditions. The study finds that the junctions between different temperature sections have the greatest impact on heat transfer coefficients and the flow from the overheated section to the evaporation section accelerates the increase of these coefficients. The buoyancy effect along the flow direction is also significant and different for the two tested boundary conditions. Additionally, the BTBC has a larger effect on the heat transfer coefficient at different junctions of the precooler compared to the HFBC. The modified Jackson correlation provides a better prediction compared to the Gnielinski correlation.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Zhang Huzhong, Cheng Keyong, Huai Xiulan, Zhou Jingzhi, Guo Jiangfeng
Summary: An experimental system was built to investigate the global and local performance of an 80-kW PCHE. The study found that thermo-physical properties have a greater effect on heat transfer performance compared to flow characteristics, and new empirical correlations were proposed.
JOURNAL OF THERMAL SCIENCE
(2021)
Article
Thermodynamics
Xin Sui, Hugh Russell, Hal Gurgenci, Sangkyoung Lee, Zhiqiang Guan, Peixin Dong
Summary: This paper presents a one-dimensional numerical modelling methodology for Printed Circuit Heat Exchangers (PCHEs) in supercritical CO2 power cycles. The methodology can simulate the steady, off-design, and transient behavior of PCHEs and has been validated against experimental results. The proposed model successfully captures the time-varying temperature changes of working fluids in different scenarios.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Review
Thermodynamics
Lei Chai, Rabia Shaukat, Liang Wang, Hua Sheng Wang
APPLIED THERMAL ENGINEERING
(2018)
Article
Thermodynamics
Lei Chai, Liang Wang, Xin Bai
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2018)
Article
Thermodynamics
Liang Wang, Xipeng Lin, Lei Chai, Long Peng, Dong Yu, Jia Liu, Haisheng Chen
ENERGY CONVERSION AND MANAGEMENT
(2019)
Article
Green & Sustainable Science & Technology
Liang Wang, Xipeng Lin, Lei Chai, Long Peng, Don Yu, Haisheng Chen
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2019)
Article
Energy & Fuels
Lei Chai, Konstantinos M. Tsamos, Savvas A. Tassou
Review
Thermodynamics
Martin T. White, Giuseppe Bianchi, Lei Chai, Savvas A. Tassou, Abdulnaser Sayma
Summary: sCO(2) offers high thermal efficiencies and compact physical footprint, but faces technical challenges and operational issues related to ambient conditions and heat availability.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Lei Chai, Savvas A. Tassou
Summary: The study investigates the thermohydraulic performance of compact recuperative heat exchangers in sCO(2) waste heat to power conversion systems. Results show that parameters like Nusselt number, heat transfer coefficient, friction factor, pressure drop, heat transfer rate, entropy generation rate, and augmentation entropy generation number have significant impacts on the performance and optimal design of these heat exchangers. Additionally, heat exchangers with zigzag channels and separator sheets demonstrate improved performance and compactness, especially for demanding high pressure and temperature applications like sCO(2) systems.
HEAT TRANSFER ENGINEERING
(2022)
Article
Thermodynamics
Lei Chai, Savvas A. Tassou
Summary: Supercritical CO2 power systems have the potential to improve thermal efficiency and net power output through the development and investigation of heat exchanger performance and system integration.
HEAT TRANSFER ENGINEERING
(2023)
Article
Thermodynamics
John W. Rose, Lei Chai
Summary: This study presents a theoretically based model to predict the heat flux and vapor-surface temperature difference during condensation on a vertical plate with sinusoidal microfins. The model takes into account the effect of gravity and surface tension-induced pressure gradient on the curved fin surface. The experimental results show good agreement with the predictions of the model, validating its accuracy.
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2022)
Review
Thermodynamics
Lei Chai, Savvas A. Tassou
Summary: This paper presents a comprehensive analysis of heat transfer characteristics and correlations for CO2 at supercritical pressure. It discusses the thermophysical properties of CO2 and reviews existing experimental and numerical studies on heat transfer for different channel geometries. The paper identifies research gaps and proposes further research needs to develop accurate heat transfer correlations for a wider range of operating conditions and applications.
JOURNAL OF ENHANCED HEAT TRANSFER
(2022)
Review
Thermodynamics
Lei Chai, Savvas A. Tassou
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2020)
Proceedings Paper
Green & Sustainable Science & Technology
Lei Chai, Savvas A. Tassou
PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON SUSTAINABLE ENERGY AND RESOURCE USE IN FOOD CHAINS INCLUDING WORKSHOP ON ENERGY RECOVERY CONVERSION AND MANAGEMENT;ICSEF 2018
(2019)
Proceedings Paper
Green & Sustainable Science & Technology
Lei Chai, Savvas A. Tassou
PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON SUSTAINABLE ENERGY AND RESOURCE USE IN FOOD CHAINS INCLUDING WORKSHOP ON ENERGY RECOVERY CONVERSION AND MANAGEMENT;ICSEF 2018
(2019)
Proceedings Paper
Green & Sustainable Science & Technology
Matteo Marchionni, Lei Chai, Giuseppe Bianchi, Savvas A. Tassou
PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON SUSTAINABLE ENERGY AND RESOURCE USE IN FOOD CHAINS INCLUDING WORKSHOP ON ENERGY RECOVERY CONVERSION AND MANAGEMENT;ICSEF 2018
(2019)
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)
