Review
Green & Sustainable Science & Technology
M. Allam, M. Tawfik, M. Bekheit, E. El-Negiry
Summary: This paper discusses the necessity of utilizing solar energy in power generation or industrial thermal processes, focusing on Concentrated Solar Power (CSP) and Parabolic Trough Concentrator (PTC) technologies. It also examines how inserts can enhance the thermal performance of PTCs and presents research trends in thermal enhancing approaches via inserts, including a statistical bibliometric analysis of the literature. Additionally, the paper delves into the thermo-physical properties and combinations of nanoparticles and base-fluids in nanofluids HTFs, revealing research prospects in this area.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Green & Sustainable Science & Technology
Ramalingam Venkatesaperumal, Kutbudeen Syed Jafar, Perumal Venkatesan Elumalai, Mohamed Abbas, Erdem Cuce, Saboor Shaik, Chanduveetil Ahamed Saleel
Summary: This study implemented a novel design idea by introducing a corrugated tube absorber and conical strip inserts in a solar parabolic trough collector, aiming to enhance the heat transfer characteristics of the working fluid passing through the absorber.
Article
Environmental Studies
Oveepsa Chakraborty, Biplab Das, Rajat Gupta
Summary: This study compares the thermal capacity of parabolic solar trough collectors with different inserts, including spherical-shaped balls and two types of elliptical inserts. A hybrid nanofluid is used as the heat-carrying liquid, which consists of CuO and Al2O3 nanoparticles mixed in distilled water. Computational analysis is conducted to study the thermal and flow trends in the tube receiver. The results show that the elliptical inserts of minor diameter 12 mm in the receiver exhibit improvements of 13.3% in thermal efficiency, 10.02% in Nusselt number, and 16% in thermal performance index compared to spherical ball inserts. The highest pump work of 35 W is associated with spherical inserts at 0.033 kg/s.
ENERGY & ENVIRONMENT
(2023)
Article
Multidisciplinary Sciences
Mohamed Mahran Kasem
Summary: This study presents a novel multi-objective optimization model for the design optimization of PTCs, with thermal and exergetic efficiencies being the primary performance indicators. The optimization model effectively maximizes both thermal and exergetic efficiencies, with water and helium achieving the highest optimal values, respectively.
SCIENTIFIC REPORTS
(2022)
Article
Mechanics
Abdullah Albaker, Nestor Cuba Carbajal, Manuel Octavio Fernandez Atho, Anderson Nunez Fernandez, Maria Del Carmen Delgado Laime, Ani Mary Borda Echavarria, Reza Alayi, Morteza Aladdin
Summary: The aim of this study is to numerically investigate the performance of a solar physical surface absorption cooling system using activated carbon/methanol as a working pair inside a parabolic-shaped solar collector. The mathematical model is based on the conservation equations and thermodynamics of the physical surface absorption process. The model is validated through comparisons with previous laboratory and numerical studies. The effects of various parameters on the system's performance are investigated, and the solar performance coefficient and specific cooling power are determined to be 0.12 and 45.6 W/kg, respectively, based on the experimental model and working conditions.
Article
Chemistry, Multidisciplinary
Nabeel Abed, Imran Afgan, Hector Iacovides, Andrea Cioncolini, Ilyas Khurshid, Adel Nasser
Summary: This study numerically investigated the effects of swirl inserts and nanofluids on thermal-hydraulic performance of parabolic trough collectors with non-uniform heating. The combination of straight conical strips alone increased Nusselt number by 47.13%, while adding nanofluids with swirl generators further enhanced it by 57.48%. Different swirl generator designs showed varying levels of improvements, with the larger swirl generator using 6% SiO2 nanofluids proving to be the optimum configuration.
Article
Thermodynamics
P. Ferrer, Khaled Mohamad, M. C. Cyulinyana, Victor Kaluba
Summary: In this article, design approaches to a receiver enclosed in an opaque cavity and heated by a solar parabolic trough collector are discussed. The optimization of the interaction between the cavity receiver and the solar radiation from a collector mirror is explored, which differs from conventional receivers and is essential for utilizing the benefits of using a cavity sleeve. Through simulations, different focal plane positions and the relative sizes of the receiver elements are investigated, and a focal plane close to the surface of the absorber pipe is found to have the highest efficiency at 62%. An experimental cavity receiver and parabolic trough system are then built based on the simulations, and the simulation results are validated against measured data with a maximum discrepancy of 8%. A novel method using the cooling behavior of the receiver is also applied to confirm the physical parameters through simulations.
APPLIED THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
N. Sreenivasalu Reddy, S. Gowreesh Subramanya, K. C. Vishwanath, M. Karthikeyan, S. Kanchiraya
Summary: The experimental study shows that using a rotary receiver tube can significantly improve the performance of the parabolic trough collector, especially when increasing the friction factor. Additionally, thermal efficiency of the collector can be improved by reducing the inlet temperature and increasing the flow rate.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Thermodynamics
Behzad Vahedi, Ehsan Golab, Arsalan Nasiri Sadr, Kambiz Vafai
Summary: The study analyzed the effectiveness of using a glass cover in a parabolic trough collector system to reduce heat losses at low Reynolds numbers. Considering temperature-dependent properties of the oil can greatly reduce the friction factor in the system.
APPLIED THERMAL ENGINEERING
(2022)
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.
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
Environmental Sciences
Mridul Sharma, Ravindra Jilte
Summary: The effect of symmetrical convex-concave corrugations on a parabolic trough solar collector's receiver pipe is investigated numerically. Twelve different geometrically configured receiver pipes with corrugations are examined, with varying corrugation pitch (4mm to 10mm) and height (1.5mm to 2.5mm). The study determines heat transfer enhancement, flow behavior, and overall thermal performance of fluid under non-uniform heat flux conditions. The presence of corrugations leads to axial whirling and vortices, enhancing heat transfer, with the receiver pipe having 8mm pitch and 2mm height giving the best results. The maximum enhancement in average Nusselt number over a smooth pipe is observed to be 28.51%.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Multidisciplinary Sciences
Mustafa J. Al-Dulaimi, Karima E. Amori
Summary: This study numerically and theoretically investigates the optical and thermal performance of a parabolic trough collector PTC system. The results show that the best optical design is the channel receiver with an intercept factor of 84%, while the worst is the elliptical receiver with an intercept factor of 70%. Thermally, the best design is the elliptical receiver with an average thermal efficiency of 90%, while the worst is the triangular receiver with an average thermal efficiency of 83%.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Anish Malan, K. Ravi Kumar
Summary: The study presents the coupled flux distribution and thermal analysis of large aperture PTSC incorporating limb darkening effect. Various parameters affecting flux distribution are analyzed, and the need for improved manufacturing standards to enhance the performance of large aperture PTSC is highlighted.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Thermodynamics
Tianxiang Hu, Trevor Hocksun Kwan, Han Zhang, Qiliang Wang, Gang Pei
Summary: This study proposes a newly shaped tube (NS-tube) to reduce the radiative heat loss of parabolic trough collector (PTC) system. The heat flux distribution and thermal efficiency are analyzed through optical simulation and heat transfer model. Results show that the thermal efficiency of NS-tube can be improved by 0.62%-4.64% compared to the original tube.
Article
Chemistry, Multidisciplinary
Solomon O. Giwa, Kayode A. Adegoke, Mohsen Sharifpur, Josua P. Meyer
Summary: This paper presents a bibliometric analysis of nanofluid research, revealing the research focus on heat transfer and flow applications. The analysis of co-authorship shows that institutions from Iran and Pakistan have published the highest number of papers, while the analysis of citation highlights highly cited papers and journals.
JOURNAL OF NANOPARTICLE RESEARCH
(2022)
Review
Thermodynamics
Suvanjan Bhattacharyya, Devendra Kumar Vishwakarma, Adithya Srinivasan, Manoj K. Soni, Varun Goel, Mohsen Sharifpur, Mohammad Hossein Ahmadi, Alibek Issakhov, Josua Meyer
Summary: The objective of this article is to study the work carried out in heat transfer augmentation using active and passive techniques. The study reviews research done in various areas such as electrohydrodynamic, magnetic field, corona wind, vortex generators, tape and coil inserts, roughness, and modified duct. It was found that passive methods are more investigated than active methods due to their safe and sound operation along with no additional requirement of power. The results show that duct modification is an effective and efficient way for heat transfer enhancement.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Review
Green & Sustainable Science & Technology
Sudhir Kumar Pathak, Pravin Omprakash Sharma, Varun Goel, Suvanjan Bhattacharyya, Hikmet S. Aybar, Josua P. Meyer
Summary: The PV/T system is proposed to decrease the thermal stress on the PV panel and improve its efficiency at high temperatures. This comprehensive review explores various PV cooling techniques, research gaps, and challenges, as well as the role of artificial intelligence in PV/T systems.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Engineering, Chemical
Mehdi Bahiraei, Nima Mazaheri, Mohammad Rasool Daneshyar, Aggrey Mwesigye
Summary: This paper examines the second law phenomena of a nanofluid within an elliptical pin-fin heat sink, providing design insights for high-performance heat sinks. The study reveals the impact of fin density and nanoparticles on thermal irreversibility.
Article
Energy & Fuels
Reza Javadpour, Saeed Zeinali Heris, Josua P. Meyer
Summary: This study experimentally investigates the effects of filled beds on the performance of a cross-flow cooling tower using nanofluids. The results show that using nanofluids instead of water improves the thermal performance of the tower, and the choice of appropriate filled beds and lower flow ratios are crucial for enhancing the tower's performance.
Article
Thermodynamics
D. Wright, K. J. Craig, P. Valluri, J. P. Meyer
Summary: In this study, the heat transfer performance of single jet and multi-jet arrays in jet impingement boiling were investigated numerically. The numerical results showed good agreement with experimental data and previous studies. The effect of conjugate heat transfer and various parameters on the nucleate boiling regime were also studied.
APPLIED THERMAL ENGINEERING
(2023)
Article
Mathematics
Mostafa Mahdavi, Mohsen Sharifpur, Magda Abd El-Rahman, Josua P. Meyer
Summary: This study numerically investigates the hydrodynamic features of laminar forced nanofluid flow between two parallel plates and discusses the method to determine the location of boundary layer merging points. The results of various Reynolds numbers are collected for the first time, and correlations are proposed to predict the length of the boundary layer merging location.
Article
Thermodynamics
Aggrey Mwesigye, Ibrahim Halil Yilmaz
Summary: This study investigates the performance of a large aperture width parabolic trough solar collector (PTSC) system with carbon dioxide (CO2) as the working fluid. The results show that supercritical CO2 has the best thermal performance compared to gaseous CO2.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Energy & Fuels
Mehrdad Zolfalizadeh, Saeed Zeinali Heris, Hadi Pourpasha, Mousa Mohammadpourfard, Josua P. P. Meyer
Summary: This study investigated the use of graphene nanoplate (GNP)/water nanofluids in a new shell-and-tube heat exchanger (STHE) and examined their impact on thermal efficiency, pressure drop, and heat transfer characteristics. The results showed that the addition of 0.06 wt.% GNP in the nanofluid improved the heat exchanger efficiency and heat transfer rate, but also increased pressure drops.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Thermodynamics
Marilize Everts, Mostafa Mahdavi, Mohsen Sharifpur, Josua P. Meyer
Summary: The thermal and hydrodynamic features of developing mixed convective laminar flow in a long horizontal tube were investigated numerically and experimentally. It was found that the conventional understanding of the merging boundary layer in internal tube flows needed modification, and methods were proposed to determine the development of the hydrodynamic and thermal boundary layers. The experimental and numerical results showed that the local mixed convective Nusselt numbers decreased near the tube inlet but increased along the tube length as secondary flow increased significantly.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Marilize Everts, Mostafa Mahdavi, Josua P. Meyer, Mohsen Sharifpur
Summary: The development of the thermal and hydrodynamic boundary layers of laminar flow in a smooth horizontal tube under forced convection conditions was studied. Numerical simulations using ANSYS Fluent 19.3 software were conducted, with a highly structured mesh and accurate temperature-dependent thermophysical properties. The simulations covered Reynolds numbers from 630 to 2000 and Prandtl numbers from 0.7 to 70. By analyzing velocity and temperature profiles, it was found that the conventional understanding of boundary layer merging in internal tube flows needed to be modified. Three distinct regions were identified in both the hydrodynamic and thermal entrance regions.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Tanimu Jatau, Tunde Bello-Ochende
Summary: The goal of this study is to achieve an optimal geometry of the U-bend tube heat exchanger by balancing pressure drop and heat transfer coefficient through minimizing entropy generation. The constructal design method and entropy generation techniques based on the second law of thermodynamics were used to conduct entropy generation minimization during two-phase flow boiling of R134a. Numerical computations were performed with different mass fluxes and qualities, and the results were consistent with those in the literature. It was found that the optimal parameters of the tube heat exchanger varied slightly with the increase in mass flux, but the stability of the optimized U-bend tube was maintained.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Green & Sustainable Science & Technology
J. H. de Beer, W. G. le Roux, A. Sciacovelli, J. P. Meyer
Summary: This study considers a recuperated solar-dish Brayton cycle with an off-the-shelf turbocharger as a micro-turbine and a rectangular cavity receiver with integrated thermal storage. The heat losses from the solar receiver were reduced by utilizing a novel glass channel cooled by the working fluid. The results showed lower solar-to-mechanical efficiencies but higher energy utilization factor when cogeneration was included.
Article
Engineering, Multidisciplinary
Ibrahim A. Fetuga, Olabode T. Olakoyejo, Sogo M. Abolarin, Adekunle O. Adelaja, Omotayo Oluwatusin, Joshua K. Gbegudu, Adrian U. Onwuegbusi, Oluwarotimi T. Shitta-Bey, Josua P. Meyer, Antonio Marcos de Oliveira Siqueira
Summary: This study numerically evaluates the thermohydraulic performance of a circular tube, which consists of semi-alternated twisted tape with cylindrical baffles and ternary nanofluid as a working fluid. The results show that, when the pitch ratio of the twisted tape decreases from 5.77 to 1.77, there is a significant improvement in the Nusselt number, pumping power, and thermal performance factor. Similarly, with an increase in the width ratio and thickness ratio, there is an increase in the Nusselt number, pressure drop, and thermal performance factor.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Emmanuel O. Atofarati, Mohsen Sharifpur, Josua Meyer
Summary: This study investigates the impact of hybrid nanofluids and certain jet hydrodynamic effects on enhancing the cooling efficiency. The findings show that the hybrid nanofluids can achieve a higher heat transfer enhancement under different parameters.
CASE STUDIES IN THERMAL ENGINEERING
(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)
