Review
Green & Sustainable Science & Technology
Anish Malan, K. Ravi Kumar
Summary: This study provides a critical summary of various raytracing techniques to investigate the optical and thermal performance of the parabolic trough solar collector (PTSC). It examines the journey of flux distribution studies, different methods like analytical approach, measurements techniques, and modeling software, with a focus on the impact of various parameters on the flux distribution. The study also suggests numerical studies for future research in this domain.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Thermodynamics
Recep Ekiciler, Kamil Arslan, Oguz Turgut, Burak Kursun
Summary: This study investigates the three-dimensional heat transfer and flow characteristics of different hybrid nanofluids in a parabolic trough solar collector receiver under turbulent flow conditions. Results show that hybrid nanofluids outperform the base fluid in terms of heat transfer and flow features, with heat transfer enhancement correlated to Reynolds number and nanoparticle volume fraction. Among the tested nanofluids, Ag-MgO/Syltherm 800 with 4.0% nanoparticle volume fraction is identified as the most efficient working fluid for the PTC receiver.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Kun Hong, Yang Yang, Saman Rashidi, Yu Guan, Qingang Xiong
Summary: This study numerically investigated the thermal and flow characteristics of a parabolic-trough solar collector, showing that an increase in Cu nanoparticle concentration led to an increase in Nu and that the effect on heat transfer enhancement was more significant at lower Reynolds numbers. The study also assessed the impact of direct normal irradiance changes on the performance of the solar collector.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Green & Sustainable Science & Technology
Virendra Vishnu Bhagwat, Sujit Roy, Biplab Das, Nikhilkumar Shah, Avijit Chowdhury
Summary: This study investigated the performance of a heat pipe assisted parabolic trough collector with paraffin wax based phase change material for solar energy storage. The experiment was conducted in North-East India, comparing the system with and without circular fins in the heat pipe evaporator section. The presence of fins improved both charging and discharging efficiency of the latent heat storage system.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Green & Sustainable Science & Technology
Qiliang Wang, Honglun Yang, Mingke Hu, Jingyu Cao, Gang Pei, Hongxing Yang
Summary: This study analyzes the emissive heat loss around the parabolic trough solar receiver, proposes the concept of a negative thermal-flux region, and designs a new parabolic trough receiver with an inner radiation shield to reduce heat loss and enhance heat-collecting performance. This innovative approach shows great potential for breakthrough enhancement in the performance of parabolic trough collector systems.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Weiwei Zhang, Linzuo Duan, Jiabin Wang, Xuyang Ba, Zijing Zhang, Rui Tian
Summary: This study investigates the effect of tracking and installation errors on the optical performance of a parabolic trough collector with heat pipe evacuated tube. The results show that within certain ranges of errors, the optical efficiency remains unchanged, providing theoretical support for selecting tracking systems with reasonable accuracy and determining allowable installation errors.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Green & Sustainable Science & Technology
Mojtaba Rezapour, Mohammad Gholizadeh
Summary: This study conducted a numerical analysis on a solar thermochemical reactor with Parabolic Trough Concentrator for Methanol Steam Reforming, considering the effects of Cu nanoparticles. By optimizing reactor performance through changing parameters like solar heat flux and nanoparticle percentage, the efficiency was shown to reach 46.3% in the optimal state. The analysis indicated that reactor efficiency is influenced by solar heat flux and nanoparticle volume fraction.
Article
Green & Sustainable Science & Technology
Amir Mohammad Norouzi, Majid Siavashi, Rouhollah Ahmadi, Milad Tahmasbi
Summary: The study shows that in parabolic trough solar collectors, selecting the appropriate rotational speed of the absorber tube can significantly reduce temperature differences and maximum surface temperature, while increasing efficiency by approximately 17%. The Ta/Re ratio and CEP play crucial roles in predicting the optimal efficiency.
Article
Multidisciplinary Sciences
Youssef Drira, Nadim Fakhfakh, Skander Jribi, Hatem Bentaher, Ilyes Benhassine, Lotfi Ammar
Summary: Parabolic trough collectors (PTCs) are advanced and widely used in solar concentrating systems, but their high cost and technology requirements hinder their implementation in low-income countries. This study assessed the performance of two small-scale solar thermal production units (SPLFR and PTC-SS) as alternatives to PTCs.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Thermodynamics
M. Arun, Debabrata Barik, K. P. Sridhar
Summary: This research analyzed the performance of a parabolic trough solar collector with a dimple tube and TiO2/DI-H2O nanofluid using computational fluid dynamics. The results showed that using nanofluids can significantly enhance the efficiency and convective heat transfer coefficient of the solar collector.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Sunil Nain, Vishal Ahlawat, Sanjay Kajal, Parinam Anuradha, Ashutosh Sharma, Tej Singh
Summary: This article evaluates the thermal performance of a parabolic trough solar air heater with a U-shaped heat exchanger, comparing copper and aluminum heat exchangers. It was found that the system with a copper heat exchanger outperformed the one with an aluminum heat exchanger, especially when using fins and at high flow rates. Additionally, the efficiency and temperature difference of the solar air heater were significantly improved with the use of fins and copper heat exchanger.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Engineering, Chemical
Elumalai Vengadesan, Siddik Thameenansari, Ella Jaganathan Manikandan, Ramalingam Senthil
Summary: The design of the solar receiver is crucial for converting solar radiation into heat transfer fluids. The use of a rectangular channel receiver with dual-functional fins as an alternative receiver shows potential in increasing heat transfer area and fluid flow path efficiency.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Review
Thermodynamics
Tawfiq Chekifi, Moustafa Boukraa
Summary: This article presents a comprehensive review of the performance improvement research on parabolic trough collectors, with a focus on works using numerical methods. It outlines the possible further developments of these devices and identifies areas that need more attention and investigation.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Xiaojing Li, Pengpeng Yan, Jiangjiang Wang, Tao Yang
Summary: This study presents a numerical simulation of parabolic trough solar collector systems with different forms of vortex generators inserted in the absorber tube using [EMIM][BF4] ionic liquid. The effects of varying parameters on the thermal performance of the system are discussed. The results show that the use of vortex generators can significantly improve the thermal efficiency and exergetic efficiency of the system under certain parameters.
APPLIED THERMAL ENGINEERING
(2024)
Article
Green & Sustainable Science & Technology
Natraj, K. S. Reddy
Summary: Solar parabolic trough collectors are a mature technology, but improvements in structural stability and accuracy of reflectors and receivers are necessary. This study investigates the combined effect of thermo-structural instability on collector performance. Results show a decrease in optical efficiency and significant loss due to bending and deflection in the reflector and receiver. This research will benefit the design and monitoring of trough collectors.
Article
Energy & Fuels
Haiying Sun, Xiaoxia Gao, Hongxing Yang
Article
Materials Science, Ceramics
Boxu Shen, Yuanhao Wang, Lin Lu, Hongxing Yang
CERAMICS INTERNATIONAL
(2020)
Article
Thermodynamics
Jia Liu, Meng Wang, Jinqing Peng, Xi Chen, Sunliang Cao, Hongxing Yang
ENERGY CONVERSION AND MANAGEMENT
(2020)
Article
Green & Sustainable Science & Technology
Qiliang Wang, Honglun Yang, Mingke Hu, Jingyu Cao, Gang Pei, Hongxing Yang
Summary: This study analyzes the emissive heat loss around the parabolic trough solar receiver, proposes the concept of a negative thermal-flux region, and designs a new parabolic trough receiver with an inner radiation shield to reduce heat loss and enhance heat-collecting performance. This innovative approach shows great potential for breakthrough enhancement in the performance of parabolic trough collector systems.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Du Jiyu, Zhicheng Shen, Hongxing Yang
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2020)
Article
Energy & Fuels
Changyu Qiu, Hongxing Yang
Article
Thermodynamics
Donggen Peng, Shaohua Xu, Hongxing Yang
APPLIED THERMAL ENGINEERING
(2020)
Review
Thermodynamics
Guoqing Yu, Hongxing Yang, Zhenye Yan, Mark Kyeredey Ansah
Summary: Facade-based building integrated photovoltaic-thermal (BIPVT) systems combine solar photovoltaics (PV) and solar collectors to generate electricity and produce thermal energy for buildings. This approach can significantly improve solar energy efficiency and reduce heating/cooling load, making it a promising method for developing low-energy or zero-energy buildings. Research on various types of BIPVT designs and their applications globally has been comprehensively evaluated in this review.
APPLIED THERMAL ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Junchao Huang, Xi Chen, Jinqing Peng, Hongxing Yang
Summary: This paper presents an integrated photovoltaic vacuum glazing unit and uses a modeling approach to quantify its thermal properties and evaluate its heat transfer performance. Results show that the photovoltaic vacuum double glazing performs best among the four configurations and can be further improved through design optimizations.
Review
Energy & Fuels
Zhenpeng Li, Tao Ma, Hongxing Yang, Lin Lu, Ruzhu Wang
Summary: Building-integrated photovoltaics (BIPVs) offer a promising solution for providing renewable electricity for achieving zero-energy buildings, but are hindered from large-scale implementations due to the difficulty of traditional photovoltaic modules in meeting the standards and aesthetics of architectural materials. The emergence of new photovoltaic materials and devices could pave the way for the future by offering diversity in colors and transparency along with comparable performance.
Article
Chemistry, Multidisciplinary
Zhenpeng Li, Tao Ma, Senji Li, Wenbo Gu, Lin Lu, Hongxing Yang, Yanjun Dai, Ruzhu Wang
Summary: This study presents a colorization strategy for solar PVs using photonic glass. By depositing a photonic glass layer on silicon solar cells, it enables the cells to have structural colors. These colored solar cells have low power conversion efficiency loss and can be encapsulated to produce PV modules with various colors and patterns.
Article
Automation & Control Systems
Shilin Sun, Tianyang Wang, Hongxing Yang, Fulei Chu
Summary: Condition monitoring (CM) of machinery is crucial for ensuring industrial process reliability. Semisupervised CM can be implemented by training on healthy samples, but data variability from complex machinery can impair CM performance. This study proposes an adversarial representation learning method to address these issues. By reconstructing operating data in signal and latent spaces and using adversarial evolution, this method obtains data representations of health conditions, reduces redundant information, and imposes constraints on unhealthy data. Experiments in wind power generation scenarios demonstrate the satisfactory performance of the proposed method.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Construction & Building Technology
Xiaochen Ma, Wenchao Shi, Hongxing Yang
Summary: The actual wetting factor of the plate surface and the movement of spray droplets are important factors in the performance of indirect evaporative cooling (IEC) systems. A 3D computational fluid dynamics (CFD) model that considers these factors is proposed in this study. The model accurately predicts the performance of IEC systems and provides insights for further improvement.
JOURNAL OF BUILDING ENGINEERING
(2024)
Article
Automation & Control Systems
Shilin Sun, Tianyang Wang, Hongxing Yang, Fulei Chu
Summary: In this article, an environmentally adaptive and contrastive representation learning method is proposed to improve the accuracy of asset condition monitoring. The method utilizes regression models and contrastive learning to obtain valid data representations. Moreover, the method establishes a reference statue for healthy assets and employs control charts for online monitoring. The remarkable performance of the method is demonstrated with real-world measurements and comparative analysis.
IEEE TRANSACTIONS ON CYBERNETICS
(2022)
Article
Engineering, Environmental
Zhe Song, Meng Wang, Hongxing Yang
Summary: This study quantifies the effects of PM2.5 on surface solar irradiance and the performance of different solar PV technologies in Hong Kong. The results show that PM2.5 concentration can lead to a decrease in solar irradiance and energy output of PV systems.
ACS ENVIRONMENTAL AU
(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)