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
Energy & Fuels
Qiliang Wang, Yao Yao, Zhicheng Shen, Hongxing Yang
Summary: A novel parabolic trough collector-photovoltaic (PTC-PV) system is proposed to enhance the thermal performance and solar utilization efficiency. Mathematical models are established and experiments are conducted to validate the superior performance of the hybrid PTC-PV system.
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
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
Qiliang Wang, Gang Pei, Hongxing Yang
Summary: The novel parabolic trough solar receiver with a radiation shield, based on the theory of the negative thermal-flux region, shows great potential for significant enhancement of the techno-economic performance of solar power plants, improving electrical energy production and reducing the levelized cost of energy.
Review
Thermodynamics
B. Kalidasan, Muhammed A. Hassan, A. K. Pandey, Subramaniyan Chinnasamy
Summary: Hollow cavity receivers are a new type of structure that overcomes the drawbacks of conventional evacuated tube receivers. They have advantages such as extended working temperature ranges, reduced thermal losses, and improved efficiency. Future research should focus on optimization and economic assessments to promote the diversified development of the solar receiver industry.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Qiliang Wang, Boxu Shen, Junchao Huang, Honglun Yang, Gang Pei, Hongxing Yang
Summary: A novel parabolic trough solar receiver integrated with vanadium dioxide-based thermochromic coating was proposed to reduce radiant heat loss and improve overall performance. Comprehensive heat transfer models were established and validated for high accuracy in predicting thermal performance. The thermochromic coating showed unique advantages in improving thermal performance of the solar receivers under both M phase and R phase, resulting in reduced heat loss and improved thermal efficiency.
Article
Thermodynamics
S. Shajan, V. Baiju
Summary: This paper presents a new stepwise approach to design a medium-temperature solar parabolic trough collector with a secondary reflector. The use of a secondary reflector significantly improves the uniformity of heat flux distribution. The findings provide a foundation for future research on the design of parabolic trough solar collector systems with secondary reflectors.
APPLIED THERMAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Anass Zaaoumi, Mohamed Asbik, Hajar Hafs, Abdellah Bah, Mohammed Alaoui
Summary: The paper evaluates the thermal performances of the solar field of the ISCC power plant at ABM in Morocco for the year of 2015, using mathematical modeling and COMSOL Multiphysics software to simulate the energy balance equations of the solar receiver, validate the model, and conclude that the predictions are accurate.
Article
Thermodynamics
Gongxing Yan, Xia Zhou, Azher M. Abed, Theyab R. Alsenani, Samia Elattar, Fan Peng, Mostafa A. H. Abdelmohimen
Summary: Parabolic trough collector (PTC) generates thermal energy by concentrating solar radiation, but integration with Photovoltaic (PV) modules significantly enhances its overall output. This research optimizes the operating parameters of the PTC/PV system and investigates the effect of rotating the receiver tube and installing metal foam on system efficiency. The optimized PTC/PV system achieves a maximum overall performance of 71.1%, but rotating the receiver tube increases the overall efficiency to 82.5% at the cost of reduced PV cell efficiency. Installing metal foam boosts electrical and overall efficiency by approximately 2% and 13.9% respectively, but slightly decreases thermal efficiency by 0.5%.
APPLIED THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Diogo do Carmo Zidan, Cristiana Brasil Maia, Mohammad Reza Safaei
Summary: Numerical simulations were conducted to predict the performance of PTC systems operating with eight different nanofluid compositions. The model also estimated daily incident solar radiation, beneficial energy gain, overall efficiency, thermal losses, and system pressure drop.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
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
Thermodynamics
Xuhang Shi, Xuyi Zhao, Fuqiang Wang, Ziming Cheng, Yan Dong, Jie Xu
Summary: This study investigates the impact of using a helically convex tube as the absorber tube of the parabolic trough collector on heat transfer and flow performance. By designing the helically convex structure, the overall heat transfer performance of the parabolic trough receiver is improved by up to 34%.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
G. Vijayan, P. P. Shantharaman, Ramalingam Senthil, R. Karunakaran
Summary: This study analyzes the performance of an unshielded receiver tube integrated solar parabolic trough collector using low-concentration Al2O3/deionized water nanofluid as the heat transfer fluid. The results show that the concentration and flow rate of the nanofluid have a positive impact on the collector efficiency.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Taysir Mhedheb, Walid Hassen, Abdallah Mhimid, Mohammed A. Almeshaal, Muapper Alhadri, Lioua Kolsi
Summary: This study validates the incorporation of paraffin phase change materials (PCMs) in a storage tank as a means to significantly prolong the operational duration of solar systems. Additionally, the addition of 1% concentration of hybrid nanoparticles enhances the storage tank temperature and reduces the melting time.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
D. D'Souza, M. J. Montes, M. Romero, J. Gonzalez-Aguilar
Summary: This paper presents an optimisation and comparative analysis of different compact plate-fin type structures for microchannel pressurised gas receivers. The study determines the optimal configuration for each structure and finds that the perforated and plain rectangular configurations demonstrate the highest exergy efficiencies of 59.21% and 58.80% respectively.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Francesco Rovense, Andres Sebastian, Ruben Abbas, Manuel Romero, Jose Gonzalez-Aguilar
Summary: This work focuses on the performance analysis of an unfired micro gas turbine integrated in a Concentrating Solar Power plant. By adjusting the inlet pressure, higher power and efficiency can be achieved under different operating conditions. Additionally, the design and analysis of a recuperator were conducted.
Article
Thermodynamics
Andres Sebastian, Ruben Abbas, Manuel Valdes
Summary: This paper presents an experimental investigation on the adverse aerothermal effects in miniaturized turbocompressors and their impact on off-design performance. A closed-loop test rig is developed to test a micro-scale turbocompressor under different boundary conditions and various gases. The study highlights the significance of a double-check procedure for assessing internal efficiency. Experimental results demonstrate the off-design low-Reynolds-number effects on efficiency and validate previous prediction methods.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Engineering, Multidisciplinary
Magdalena Barnetche, Luis F. Gonzalez-Portillo, Javier Munoz-Anton, Ruben Abbas, Mercedes Ibarra, Ruben Barbero, Antonio Rovira
Summary: This study aims to analyze the impact of thermal pipelines inertia on a small-scale solar concentrator system. By comparing simulation results, it was found that pipeline inertia delays the system start-up sequence and decreases the temperature of heat transfer fluids, leading to a decrease in total energy production. Therefore, dynamic simulation is important in solar heat for industrial processes (SHIP) systems.
RESULTS IN ENGINEERING
(2023)
Article
Thermodynamics
Magdalena Barnetche, Luis F. Gonzalez-Portillo, Ruben Abbas
Summary: This study analyzes the optimum integration of latent storage in solar heating and cooling for an industrial process, comparing two configurations. It concludes that connecting the thermal energy storage (TES) in series represents the optimal configuration due to its cost-effectiveness and simplicity compared to the parallel layout.
APPLIED THERMAL ENGINEERING
(2023)
Article
Physics, Multidisciplinary
Susana Sanchez-Orgaz, Fernando Varela, Javier Rodriguez, Celina Gonzalez
Summary: In order to determine the thermodynamic properties of compressed liquids, it is common to treat them as incompressible systems, as liquids and solids are well represented by this thermodynamic model. Two common hypotheses within this model are the strictly incompressible (SI) model, where a constant specific volume v = v(0) is assumed, and the more general temperature-dependent incompressible (TDI) model, which relates specific volume to temperature, v = vT. This study aims to provide a comprehensive formulation for the TDI model and demonstrate its advantages over the SI model. The findings show that the proposed model performs better than the traditional model in the study of subcritical liquids. One potential application of this model is its integration into thermodynamic calculation software packages, such as EES, which currently utilize the SI model for certain incompressible substances.
Article
Energy & Fuels
Antonio Rovira, Ruben Barbero, Guillermo Ortega, Antonio Subires, Marta Munoz
Summary: This paper proposes and analyzes configurations for hybridizing CSP plants with CCGT in order to increase solar contribution while maintaining synergies. Two thermal energy management systems are introduced at different temperature levels. The enhanced configuration overcomes the issue with solar dumping and improves performance from both thermodynamic and economic perspectives.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Thermodynamics
M. J. Montes, V. Stojceska, D. Reay, M. Ibarra
Summary: This study focuses on the application of linear Fresnel technology for solar heating in industrial processes, and proposes a new design for a pressurized gas microchannel receiver. By using two converging absorber panels with compact core fin structures, the flow of the fluid is optimized to improve heat transfer. A thermal resistance model is formulated to quantify fluid heating and thermal gradient along the panel length and thickness, and a thermo-exergy optimization is conducted based on specific characteristic parameters.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Ruben Abbas, Ruben Barbero, Antonio Rovira, Magdalena Barnetche
Summary: Two collectors based on SunDial technology were designed for a dairy company in Corinth (latitude 37.9 degrees N) and a steel company in Iasi (47.1 degrees N). Different concept designs, one-axis and two-axis tracking, were used due to the discrepancy in latitudes. Various models were employed to develop these collectors, including a thermal model, analytic models, and a Monte Carlo Ray Tracing model. The optimization results showed the adoption of double-field configurations with compact collectors at the final locations, resulting in an annual energy yield of 27.8 MW h.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Thermodynamics
M. J. Montes, R. Guedez, D. D'Souza, J. I. Linares, J. Gonzalez-Aguilar, M. Romero
Summary: This study presents a novel design of microchannel central receiver for pressurised gases and supercritical fluids in solar tower plants. It consists of a radial arrangement of vertical absorber panels that converge on the central axis of the tower. The absorber panels comprise compact structures, whose compactness is increased in one flow pass compared to the previous one, as the fluid is heated.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Proceedings Paper
Computer Science, Theory & Methods
Oswaldo Andres Vanegas Guillen, Jose Leonardo Benavides Maldonado, Javier Munoz Anton, Janeth Pilar Diaz Vera, Carlos Hugo Lozada Cabrera
Summary: This work presents the implementation of an online laboratory for the teaching of thermo-fluids systems design, using an Internet of Things architecture. The laboratory consists of various components and users can access the practices through Moodle LMS. The objects in the laboratory are managed using a Remote Learning Management System application. The work is validated through an online practice of PID control.
ONLINE ENGINEERING AND SOCIETY 4.0
(2022)
