Article
Thermodynamics
Ruiqiang Sun, Ming Liu, Xun Chen, Kaixuan Yang, Junjie Yan
Summary: This study compares and summarizes CHP systems based on the SCO2 Brayton cycle, finding that the back-pressure type CHP system using the SCO2 recompression-reheat cycle has the highest exergy efficiency, while the configuration E-2, integrating the recompression-intercooling cycle, high-pressure extraction heating, and reheat, achieves a perfect balance between high heat and electricity demands.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Engineering, Chemical
Ping Song, Zhenxing Zhao, Lie Chen, Chunhui Dai, Chonghai Huang, Mengran Liao, Xingsheng Lao, Yuansheng Lin, Wei Wang
Summary: The supercritical carbon dioxide (SCO2) Brayton cycle is a promising alternative to the steam cycle in power generation systems. Dynamic performance research of the SCO2 cycle is crucial for considering load variability and control flexibility. The use of Simulink software to develop a dynamic model of the SCO2 cycle has shown positive results in system operation and control.
Article
Energy & Fuels
Hua Tian, Xin Lin, Ligeng Li, Xianyu Zeng, Yurong Wang, Lingfeng Shi, Xuan Wang, Xingyu Liang, Gequn Shu
Summary: In this study, the operation pattern and output performance of a 10 kW S-CO2 axial turbine are investigated using experiments and numerical simulations. The results show that at the designed condition, the turbine achieves an output power of 9.66 kW and an efficiency of 36.6%. The results also indicate that the turbine's performance is influenced by the pressure ratio and rational speed. Additionally, the flow field distribution reveals the occurrence of flow separation phenomenon, with tip clearance loss being the most significant.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Thermodynamics
Kunlin Cheng, Jiahui Li, Jianchi Yu, Chuanjie Fu, Jiang Qin, Wuxing Jing
Summary: Supercritical carbon dioxide closed-Brayton-cycle (CBC) is a promising thermodynamic cycle for power generation. However, the traditional layouts of simple recuperation and recompression have their respective problems. This research proposes five thermoelectric generator (TEG) enhanced CBC configurations based on simple recuperation layout, and showed that a configuration with split flow has a significant enhancing effect on power generation efficiency. An improved TEG enhanced CBC scheme with an additional TEG as a pre-cooler is also proposed and it achieves higher power generation efficiency compared to the traditional recompressing CBC, even with relatively high compressor and turbine efficiencies.
Article
Thermodynamics
Jae Eun Cha, Joo Hyun Park, Gibbeum Lee, Han Seo, Sunil Lee, Heung-June Chung, Si Woo Lee
Summary: This study provides the current research status of the supercritical CO2 power generation system in KAERI, focusing on system design and compressor operation. The study developed a cycle design for a 500 kW supercritical CO2 power generation system pilot plant for waste heat recovery, achieving a thermal efficiency of 16.5%. Furthermore, detailed designs of key components and compressor performance tests were successfully completed.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Xiaofeng Ma, Peixue Jiang, Yinhai Zhu
Summary: This study proposes a novel integrated cooling and power generation system based on a supercritical CO2 recuperative Brayton cycle for hypersonic vehicles. The system can meet the cooling requirements of a TBCC engine and provide continuous power. Optimization algorithms are used to obtain the global performance curves and loads of each component, showing the system's good dynamic performance and fuel-saving advantages.
APPLIED THERMAL ENGINEERING
(2022)
Article
Chemistry, Physical
Ying Song, Chang Xu
Summary: In this paper, a multi-energy complementary power generation system is designed, combining solar power, geothermal power, and hydrogen power. The results of thermodynamic and sensitivity analysis show that the system has high energy and exergy efficiency, and the CO2 circulation can significantly reduce greenhouse gas emissions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Enhui Sun, Xiangren Wang, Qichen Qian, Huifeng Li, Wenjing Ma, Lei Zhang, Jinliang Xu
Summary: Compared to the steam Rankine cycle, the supercritical carbon dioxide Brayton cycle has the advantage of high efficiency. This paper proposes the supercritical reheating regeneration process and constructs the supercritical regenerative Rankine cycle, which increases the thermal efficiency of the Rankine cycle by heating the feedwater and reheated steam.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
Xiang Wan, Kun Wang, Cheng-Ming Zhang, Tie-Chen Zhang, Chun-Hua Min
Summary: An integrated model of solar power tower coupling with the Brayton power cycle is developed, and the particle swarm optimization algorithm is utilized to search for optimal operation parameters and control schemes under off-design conditions with different ambient temperatures. The proposed control schemes improve power cycle efficiency and save total power output in low ambient temperature, while controlling losses in a small range in high ambient temperature.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Saboora Khatoon, Man-Hoe Kim
Summary: In pursuit of efficient renewable electricity generation, this study focuses on the application of concentrating solar power technology using receiver tower and heliostat field. Through the development of a suite of code, influential parameters of the system, including heliostat field design, thermal energy storage, and the Brayton power cycle, are calculated. The study evaluates the performance of the system under different climatic conditions and demonstrates the higher efficiency and net power output of the system when using the recompression cycle configuration. The findings and methodology are significant for the future utilization of supercritical carbon dioxide Brayton cycle in concentrated solar power plants.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Joo Hyan Park, Jae Eun Cha, Si Woo Lee
Summary: This study focuses on the design and performance evaluation of a 150-kW-class supercritical CO2 centrifugal compressor for a 500-kW power generation system. Experimental tests showed that the compressor achieved a high efficiency of 80% during four repeated tests, confirming its practicality for the supercritical CO2 power generation system. The reliability of the compressor performance was examined and the effects of control valve opening rate and impeller rotational speed on load changing were analyzed.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Xinyu Miao, Haochun Zhang, Wenbo Sun, Qi Wang, Chenxu Zhang
Summary: The study focuses on optimizing the recompression supercritical Brayton cycle by using a new composition of working fluid to improve the thermal efficiency and performance of the nuclear power system. By determining the optimum parameters such as split ratio, pressure ratio, minimum operating temperature, maximum operating temperature, and minimum operating pressure, the maximum thermal efficiency and minimum BRU mass have been achieved.
Article
Energy & Fuels
S. I. Schoffer, S. A. Klein, P. V. Aravind, R. Pecnik
Summary: New technologies are being developed to produce electricity cleaner and more efficiently, with promising technologies including solid oxide fuel cells and supercritical carbon dioxide Brayton cycles. The integration of these technologies has great potential, improving system efficiency and reducing the size of heat exchangers.
Article
Green & Sustainable Science & Technology
Ning Ma, Fugui Meng, Wenpeng Hong, Haoran Li, Xiaojuan Niu
Summary: This paper proposes an improved recompression combined cycle configuration using CO2-propane in a direct-heating solar power tower (SPT) plant. The effects of critical parameters on overall performance were analyzed in detail. The study shows that the exergy loss of regenerators was reduced, and the entire exergy efficiency of the SPT plant was improved by configuring two high-temperature regenerators. The use of CO2-propane mixture provides a valuable reference for the application in the dry-cooling Brayton cycle of the direct-heated SPT plant.
Article
Thermodynamics
Yingzong Liang, Jiansheng Chen, Zhi Yang, Jianyong Chen, Xianglong Luo, Ying Chen
Summary: The study focuses on the optimal design of a CSP system combined with a supercritical CO2 Brayton cycle and thermal storage, considering economic and environmental objectives. A multi-objective MINLP model is developed to find a balanced solution that achieves both economic and environmental goals.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Elizabeth Balke, Gregory Nellis, Sanford Klein, Harrison Skye, Vance Payne, Tania Ullah
SCIENCE AND TECHNOLOGY FOR THE BUILT ENVIRONMENT
(2018)
Article
Thermodynamics
Amy Van Asselt, Douglas T. Reindl, Gregory E. Nellis
SCIENCE AND TECHNOLOGY FOR THE BUILT ENVIRONMENT
(2018)
Article
Thermodynamics
Jacob Hinze, Logan Rapp, Gregory Nellis, Mark Anderson, Evan Reznicek, Robert Braun
APPLIED THERMAL ENGINEERING
(2019)
Article
Engineering, Electrical & Electronic
Mingda Liu, William Sixel, Bulent Sarlioglu, Gregory Nellis
IET ELECTRIC POWER APPLICATIONS
(2020)
Article
Thermodynamics
Evan P. Reznicek, Jacob F. Hinze, Logan M. Rapp, Gregory F. Nellis, Mark H. Anderson, Robert J. Braun
ENERGY CONVERSION AND MANAGEMENT
(2020)
Article
Thermodynamics
G. Koutsakis, G. F. Nellis, J. B. Ghandhi
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Thermodynamics
G. Koutsakis, G. F. Nellis, J. B. Ghandhi
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Engineering, Multidisciplinary
William Sixel, Mingda Liu, Gregory Nellis, Bulent Sarlioglu
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2020)
Article
Thermodynamics
Evan P. Reznicek, Jacob F. Hinze, Gregory F. Nellis, Mark H. Anderson, Robert J. Braun
Summary: The study explores the use of regenerators as a low-cost alternative for recuperation in sCO(2) power cycles. Two regenerator-valve design options are assessed, both leading to significant fluctuations in turbomachinery flow rate, turbomachinery and system power, and regenerator discharge process outlet temperature. Adding a packed bed between the regenerator and the primary heat exchanger can reduce regenerator discharge process outlet temperature fluctuations, with potential for further reductions by increasing the size of the packed bed.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Proceedings Paper
Physics, Applied
J. Detlor, R. Gruenstern, J. Pfotenhauer, G. Nellis
ADVANCES IN CRYOGENIC ENGINEERING
(2020)
Proceedings Paper
Energy & Fuels
William Sixel, Mingda Liu, Gregory Nellis, Bulent Sarlioglu
2019 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)
(2019)
Proceedings Paper
Thermodynamics
Jason Chan, Brian E. Fehring, Roman W. Morse, Kristofer M. Dressler, Gregory F. Nellis, Evan T. Hurlburt, Arganthael Berson
PROCEEDINGS OF THE ASME 17TH INTERNATIONAL CONFERENCE ON NANOCHANNELS, MICROCHANNELS, AND MINICHANNELS, 2019
(2019)
Proceedings Paper
Thermodynamics
Amy Van Asselt, Douglas T. Reindl, Gregory F. Nellis
ASHRAE TRANSACTIONS, VOL 124, PT 1
(2018)
Proceedings Paper
Energy & Fuels
William Sixel, Mingda Liu, Gregory Nellis, Bulent Sarlioglu
2018 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)
(2018)
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)