Article
Green & Sustainable Science & Technology
Ayad K. Khlief, Syed Ihtsham Ul Haq Gilani, Hussain H. Al-Kayiem, Sanan T. Mohammad
Summary: This study aimed to describe the performance of evacuated tubes (ETs) as a solar tower receiver through experimental evaluation and simulation, showcasing the potential of a hybrid system with liquid cooling for monocrystalline solar cells. Results demonstrated that the hybrid system in Case 2 outperformed Case 1 in terms of heat transfer fluid temperature, heat gain, and receiver efficiency. The use of secondary concentrators in the hybrid system led to significant improvements in receiver performance.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Yousef N. Dabwan, Gang Pei, Trevor Hocksun Kwan, Bin Zhao
Summary: The study introduces a new hybrid solar preheating intercooled gas turbine (SP-IcGT), which outperforms the conventional hybrid solar preheating gas turbine (SP-GT) in terms of fuel-based efficiency and specific fuel consumption. By integrating solar energy with the intercooled gas turbine, fuel consumption and greenhouse gas emissions can be greatly reduced while achieving economic benefits.
Article
Thermodynamics
Mohamed A. Hamouda, Mostafa F. Shaaban, Mohamed A. Sharaf Eldean, Hassan E. S. Fath, Mayyada Al Bardan
Summary: This paper presents a technoeconomic assessment of a solar-driven co-generation system for water production and power generation. The results reveal that utilizing waste heat for multistage flash desalination can achieve lower costs, water price, and CO2 emissions.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Manish Raj, Jishnu Bhattacharya
Summary: This article presents an improved method to estimate the optical efficiency of a heliostat field. The method combines Elliptical Gaussian Distribution and Pseudo Ray Tracing to estimate flux in the image plane and translates the flux to the receiver for spillage estimation. The method is rigorously validated and achieves high accuracy with low computational cost.
Article
Thermodynamics
Yun Liu, Yue Dong, Ling-tian Xie, Chuan-zhi Zhang, Chao Xu
Summary: This study analyzes the convective heat transfer characteristics of supercritical CO2 in tower solar receivers under non-uniform heat flux and proposes a non-uniform structure for improving the heat transfer performance. The results show that triangular ribs tube is the best heat transfer enhancement structure.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
R. P. Merchan, M. J. Santos, J. Garcia-Ferrero, A. Medina, A. Calvo Hernandez
Summary: This study simulates a hybrid central tower thermo-solar plant working with a gas turbine using an in-house developed model and software, considering integration of all plant subsystems and the efficiency factors of the heliostat solar field. The fast, flexible and precise model allows for sensitivity studies on the plant efficiency and design parameters, with a focus on the levelized cost of electricity and the key parameters affecting it, such as turbine inlet temperature and solar receiver aperture size.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
M. Laporte-Azcue, P. A. Gonzalez-Gomez, M. R. Rodriguez-Sanchez, D. Santana
Summary: This study focuses on the material selection, tube design, and key issues during the operation of solar power tower central receivers, taking into account the impact of several common alloys on receiver performance. The research indicates that factors such as temperature, strength, and stress relaxation must be considered when selecting materials and designing receivers.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Thermodynamics
Tianyao Pan, Jiong Shen, Bjorn Laumert, Wujun Wang
Summary: A novel gas turbine simulator has been developed to simulate the boundary conditions of a gas turbine under various workloads. The simulator can automatically regulate fluid parameters and has shown fast response and convergent control results. It has high precision in pressure control for steady states and can effectively control mass flow and temperature perturbations in transient states.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Energy & Fuels
Chen Kang, Wang Xiao, Chen Pengfei, Wen Long
Summary: Numerical simulation study reveals that metal foam absorbers can effectively reduce pressure loss and improve overall performance index PEC.
Article
Acoustics
Junling Chen, Jinwei Li, Dawei Wang, Youquan Feng
Summary: The steel-concrete hybrid wind turbine tower, with its different material composition, shows significant differences in seismic dynamic response compared to traditional wind turbine towers. The seismic action effects analyzed through the response spectrum method are lower than those using the nonlinear time history method, indicating the necessity of time history analysis as a supplementary to seismic design.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Thermodynamics
Mohamed Qenawy, Hany S. El-Mesery, Junfeng Wang, Salama Abdelhady
Summary: This paper presents a detailed design, construction, and operation of a small-scale concentrated solar tower (CST) for water heating in Aswan. By mathematical modeling and experimental verification, the feasibility of CST technology is confirmed. The designed optical efficiency is X85.46% and the thermal efficiency is X52%, providing a prototype for advanced CST application in the future.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
M. Casanova, J. Ballestrin, R. Monterreal, J. Fernandez-Reche, R. Enrique, A. Avila-Marin
Summary: Solar tower plants require measurement of high solar irradiance on the receiver. The current methods have limitations, but a new indirect method using the receiver surface, a radiometer, and a digital camera has shown good results and simplified the measurement process.
Article
Energy & Fuels
Rosa P. Merchan, Maria J. Santos, Alejandro Medina, Antonio Calvo Hernandez
Summary: Concentrated Solar Power (CSP) is a challenging renewable technology that combines central receiver solar plants with gas turbines to improve efficiency and reduce water consumption. Hybrid plants with combustion chambers maintain constant power output during periods of low solar irradiance, ensuring predictable electricity production. An integrated, simplified solar thermodynamic model has been developed to simulate the operation of a hybrid gas turbine solar plant, focusing on a reduced number of parameters with clear physical meanings.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Jinli Chen, Gang Xiao, Haoran Xu, Xin Zhou, Jiamin Yang, Mingjiang Ni, Kefa Cen
Summary: This study investigates the dynamic performance of a solar collector through experiments and modeling, and the proposed method is beneficial for the design and optimization of solar collectors.
Article
Green & Sustainable Science & Technology
Yun Liu, Yue Dong, Tao Li, Chuan-Zhi Zhang
Summary: This study investigates the effect of tube structure on the performance of supercritical CO2 in a concentrated solar power generation system. A novel alternative elliptical twisted tube is designed and its impact on heat transfer performance is analyzed using the field synergy principle. The results show that the novel tube structure exhibits superior heat transfer performance compared to traditional tube structures, providing guidance for structural optimization of practical receivers.
Article
Energy & Fuels
Christoph Hilgert, Fabian Howar, Marc Roger
Article
Energy & Fuels
Simon Caron, Marc Roeger, Michael Wullenkord
Review
Energy & Fuels
Johannes Christoph Sattler, Marc Roger, Peter Schwarzboezl, Reiner Buck, Ansgar Macke, Christian Raeder, Joachim Gottsche
Article
Energy & Fuels
Kristina Blume, Marc Roeger, Tim Schlichting, Ansgar Macke, Robert Pitz-Paal
Review
Energy & Fuels
Alex Brenner, Tobias Hirsch, Marc Roeger, Robert Pitz-Paal
Summary: This review provides detailed information about the measurement instrumentation used in parabolic trough fields and recent monitoring approaches, including their measurement uncertainty, costs, and installation location. The study suggests that while the usually installed instrumentation delivers a large number of measurements throughout the field, it sacrifices some accuracy, compared to special test facility equipment. Recently introduced measurement approaches have the potential to improve standard instrumentation in terms of accuracy, frequency, spatial distribution, and the amount of measurands.
Article
Thermodynamics
Cathy Frantz, Reiner Buck, Marc Roger, Bernhard Hoffschmidt
Summary: The forced convective heat transfer of molten nitrate salt in a circular smooth tube is experimentally investigated, and the Nusselt number is accurately calculated by reviewing the thermophysical properties of Solar Salt. The experiments are conducted with Solar Salt at fluid bulk temperature ranging between 300°C and 550°C, covering a wide range of Reynolds numbers and heat fluxes. This study provides important data on the behavior of forced convective heat transfer of molten salt for Reynolds numbers larger than 10^5.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Energy & Fuels
Kristina Blume, Marc Roeger, Robert Pitz-Paal
Summary: Wind loads on heliostats are often investigated through experimental wind tunnel studies or numerical simulations. However, these approaches cannot consider the full-scale conditions but require a reproduction and simulation of both the heliostat structure and the wind conditions. Complementary full-scale investigations are therefore crucial but are at the same time relatively costly, as it is cumbersome to set up large heliostats with measurement devices. This paper introduces a new pressure measurement system which is easy-to-apply to a real-scale heliostat and enables full-scale investigations with minimized effort. The results of a first field study are presented during which wind and pressure measurements were taken simultaneously over periods of 10 min at a 48.5 m² pentagonal Stellio heliostat. The non-dimensional pressure distributions are investigated and it is shown that the mean cp-values are very consistent amongst the measurement periods and reach values between 2.2 and 2.6. These values, in turn, are found to agree well with results of a wind tunnel study. Moreover, the behavior of the load coefficients with varying angles of attack is studied and the aerodynamic admittance functions are evaluated which give in-depth insight into the generation of aerodynamic loads. The admittance functions are found to start decreasing at a non-dimensional frequency of approximately 0.2. This finding indicates that eddies which are about the size of the heliostat or larger are fully effective in generating aerodynamic loads while the effectiveness of smaller eddies is reduced.
Article
Thermodynamics
Cathy Frantz, Reiner Buck, Marc Roeger, Bernhard Hoffschmidt
Summary: The forced convective heat transfer and pressure difference of molten nitrate salt in a spirally grooved tube are experimentally investigated. The data covers a wide range of Reynolds numbers and Prandtl numbers, as well as different salt temperatures and heating flux densities. The results are compared with measurements from other setups and literature in order to deduce relative Nusselt numbers and friction factors.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Energy & Fuels
Kristina Blume, Marc Roeger, Robert Pitz-Paal
Summary: Wind-induced tracking deviations of heliostats can be analyzed through numerical simulations or experimental studies, but simpler estimations are necessary and sufficient. This paper presents the derivation and development process of an analytical model that describes the wind-induced tracking deviations of heliostats. The model is verified with measurement data and shows good agreement with expectations, supporting its use for estimation and prediction of wind-induced tracking deviations with comparatively little effort. The developed model also helps identify and analyze the parameters that have the greatest impact on wind-induced tracking deviations of different types of heliostats.
Article
Energy & Fuels
Alex Brenner, James Kahn, Tobias Hirsch, Marc Roeger, Robert Pitz-Paal
Summary: This study develops a data-driven method using machine learning to estimate the soiling level of parabolic trough collectors, with gloss values as a surrogate for soiling values. Results show that a Decision Tree model achieves the best performance in estimating specific soiling values, and also improves the cleaning schedule of the solar power plant.
Proceedings Paper
Energy & Fuels
Fabian Wolfertstetter, Robin Fonk, Christoph Prahl, Marc Roger, Stefan Wilbert, Jesus Fernandez-Reche
INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS (SOLARPACES 2019)
(2020)
Proceedings Paper
Energy & Fuels
Simon Caron, Jorge Garrido, Eneko Setien, Ridha Harzallah, Luka Noc, Ivan Jerman, Marc Roger, Florian Sutter
INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS (SOLARPACES 2019)
(2020)
Proceedings Paper
Energy & Fuels
Daniel Nieffer, Timo Effertz, Ansgar Macke, Marc Roger, Gerhard Weinrebe, Steffen Ulmer
SOLARPACES 2018: INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS
(2019)
Proceedings Paper
Energy & Fuels
Matthias Offergeld, Marc Roger, Hannes Stadler, Philip Gorzalka, Bernhard Hoffschmidt
SOLARPACES 2018: INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS
(2019)
Proceedings Paper
Energy & Fuels
Steffen Schedler, Steffen Ulmer, Henning Koch, Marc Roger, Daniel Benitez, Christoph Prahl, Gerhard Weinrebe
SOLARPACES 2018: INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS
(2019)
Article
Energy & Fuels
Siddharth Sradhasagar, Omkar Subhasish Khuntia, Srikanta Biswal, Sougat Purohit, Amritendu Roy
Summary: In this study, machine learning models were developed to predict the bandgap and its character of double perovskite materials, with LGBMRegressor and XGBClassifier models identified as the best predictors. These models were further employed to predict the bandgap of novel bismuth-based transition metal oxide double perovskites, showing high accuracy, especially in the range of 1.2-1.8 eV.
Article
Energy & Fuels
Wei Shuai, Haoran Xu, Baoyang Luo, Yihui Huang, Dong Chen, Peiwang Zhu, Gang Xiao
Summary: In this study, a hybrid model based on numerical simulation and deep learning is proposed for the optimization and operation of solar receivers. By applying the model to different application scenarios and considering multiple performance objectives, small errors are achieved and optimal structure parameters and heliostat scales are identified. This approach is not only applicable to gas turbines but also heating systems.
Article
Energy & Fuels
Mubashar Ali, Zunaira Bibi, M. W. Younis, Muhammad Mubashir, Muqaddas Iqbal, Muhammad Usman Ali, Muhammad Asif Iqbal
Summary: This study investigates the structural, mechanical, and optoelectronic properties of the BaCuF3 fluoroperovskite using the first-principles modelling approach. The stability and characteristics of different cubic structures of BaCuF3 are evaluated, and the alpha-BaCuF3 and beta-BaCuF3 compounds are found to be mechanically stable with favorable optical properties for solar cells and high-frequency UV applications.
Article
Energy & Fuels
Dong Le Khac, Shahariar Chowdhury, Asmaa Soheil Najm, Montri Luengchavanon, Araa mebdir Holi, Mohammad Shah Jamal, Chin Hua Chia, Kuaanan Techato, Vidhya Selvanathan
Summary: A novel recycling system is proposed in this study to decompose and reclaim the constituent materials of organic-inorganic perovskite solar cells (PSCs). By utilizing a one-step solution process extraction approach, the chemical composition of each layer is successfully preserved, enabling their potential reuse. The proposed recycling technique helps mitigate pollution risks, minimize waste generation, and reduce recycling costs.
Article
Energy & Fuels
Peijie Lin, Feng Guo, Xiaoyang Lu, Qianying Zheng, Shuying Cheng, Yaohai Lin, Zhicong Chen, Lijun Wu, Zhuang Qian
Summary: This paper proposes an open-set fault diagnosis model for PV arrays based on 1D VoVNet-SVDD. The model accurately diagnoses various types of faults and is capable of identifying unknown fault types.
