Article
Green & Sustainable Science & Technology
Xiao-Lei Li, Xin-Lin Xia, Chuang Sun, Zhi-Hao Chen
Summary: A solar receiver with an annular inner window is proposed to improve temperature uniformity of the absorber, the numerical model analysis shows that installing an annular window can reduce the temperature difference in the absorber and increase the thermal efficiency.
Article
Chemistry, Multidisciplinary
Tayeb Fahim, Samir Laouedj, Aissa Abderrahmane, Sorour Alotaibi, Obai Younis, Hafiz Muhammad Ali
Summary: This research numerically explores the impact of introducing obstacles to the receiver tube of a parabolic trough collector on heat transmission and overall thermal performance. The results show that obstacles can enhance the collector's thermal performance under specific geometrical parameters and spacing, and increasing the concentration of solid nanoparticles in the thermal oil improves heat transmission.
Article
Green & Sustainable Science & Technology
Luca Prattico, Nicola Fronza, Ruben Bartali, Andrea Chiappini, Enrico Sciubba, J. Gonzalez-Aguilar, Luigi Crema
Summary: This work introduces a new methodology for the 3D optical-performance analysis of volumetric solar receivers with an open hierarchical structure. The experimental technique proposed in this study shows promise as a robust in operando method for characterizing radiation propagation within complex porous structures used in volumetric receivers.
Article
Thermodynamics
J. Garcia Ferrero, R. P. Merchan, M. J. Santos, A. Medina, A. Calvo Hernandez, P. Canhoto, A. Giostri
Summary: This paper conducts a heat transfer analysis on an air volumetric receiver coupled to a parabolic dish for distributed generation. The optical efficiency of the dish collector is computed using ray-tracing software, while the thermal performance of the solar receiver is modeled under steady-state conditions. The results show that the thermal efficiency of the receiver depends on solar irradiance, receiver geometry, materials, and ambient temperature.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Energy & Fuels
Zili He, Paule Lapeyre, Stephane Blanco, Simon Eibner, Mouna El Hafi, Richard Fournier
Summary: Optical optimizations for a Concentrated Solar Power (CSP) system are limited to gradient-free methods due to the lack of accurate gradient information. This article proposes new algorithms of the Monte-Carlo type to numerically estimate the gradient of power impacting the receiver in a Solar Power Tower (SPT) system. Physical models are built to quantify the geometric sensitivities of intensity, representing the relations between the geometric parameters and physical events in the SPT system. These models allow for sensitivity analysis and optimization by estimating the contributions of physical events to the gradient.
Article
Green & Sustainable Science & Technology
Leopoldo Martinez-Manuel, Wujun Wang, Manuel I. Pena-Cruz
Summary: This study optimized the optical design of a modular low flux solar simulator, achieving higher quality solar technology qualification testing. The optical performances of the design were analyzed using Monte Carlo ray tracing technique, and reflector design parameters were optimized to improve flux distribution uniformity. By introducing a shutter curtain for flux regulation, different levels of average flux were achieved.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
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
Multidisciplinary Sciences
Syed Aun Ali Rizvi, Muhammad Uzair
Summary: This study investigates the geometry and configuration of secondary reflectors in a solar parabolic trough collector. The optical efficiency is analyzed using four different profiles of secondary reflectors. Ray-tracing software is used to simulate and analyze their effects on flux uniformity and intensity. The results show that the parabolic reflector has the highest efficiency, increasing solar flux by 37% with high uniformity. Triangular reflectors enhance solar flux by 28% but have weaker flux distribution. The flat-parabolic reflector is the second best option, improving flux by 32% and providing improved uniformity. The parabolic-parabolic segmented reflector has the lowest efficiency due to the non-uniformity caused by the divergence of its focal points.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
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
Ahmed Gamil, Peiwen Li, Abdel Latif Khammash
Summary: This study focuses on modeling and optimizing a novel relocatable solar power tower system for low to medium-temperature industrial process heat applications. The system uses small-size removable heliostats and a 40 m-high steel truss tower with an external receiver for steam production. The approach was validated through the analysis of reference solar thermal power plants and a comparison with a radial staggered heliostat field.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Green & Sustainable Science & Technology
Tufan Akba, Derek Baker, M. Pinar Menguc
Summary: This study optimizes the design of a micro-scale pressurized volumetric receiver by changing geometry and flow rate, while considering volume, outlet air temperature, and outer surface temperature constraints. The model is replicated and restructured using OpenMDAO framework with efficient derivative calculation. Verification and analysis of optimization performance, selection of optimizers, domain size impact, and radiative methods are discussed. A solution methodology is suggested for future design optimizations of macro-scale pressurized volumetric receivers.
Article
Green & Sustainable Science & Technology
Xiaoxia Lin, Caitou He, Wenjun Huang, Yuhong Zhao, Jieqing Feng
Summary: This paper proposes a more accurate Monte Carlo ray-tracing simulation method considering refraction and total internal reflection effects caused by the glass layer. Experiments and simulations reveal that refraction has non-negligible effects on the simulation results, reducing the radiative flux and total energy, and causing the reflection spot to spread or the ray to be trapped in the glass.
Article
Thermodynamics
X. Randez, F. Zaversky, D. Astrain
Summary: A new active volumetric receiver prototype was used in this study to evaluate its thermal performance. Numerical and experimental investigations were conducted on the rotating disk cooling and convective heat transfer from the disks to a crossflow of air. The results show promising thermal performance of the lab-scale receiver and a potential improvement in efficiency compared to existing volumetric receivers.
APPLIED THERMAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Tieliu Jiang, Mingqi Liu, Jianqing Lin
Summary: This study fills the gap in the research on the thermo-electric properties of fluid-based CPVT collectors under non-uniform energy flux. The actual solar flux distribution is obtained using Tracepro software and employed as a boundary condition in ANSYS Workbench 2022R1 software to improve the accuracy of the CFD modeling. The results show that the PVT hybrid system has a high conversion efficiency, with a total efficiency of more than 50%.
Article
Green & Sustainable Science & Technology
Ali Godini, Saeid Kheradmand
Summary: Concentrated Solar power plants utilize Volumetric Solar receivers, a key component that has attracted significant attention from researchers. The study optimized important parameters using response surface and experimental design methods to minimize pressure drop and maximize output temperature. Emphasis was placed on the simultaneous effects of parameters on receiver performance for practical application.
Article
Thermodynamics
Bao-Cun Du, Ya-Ling He, Zhang-Jing Zheng, Ze-Dong Cheng
APPLIED THERMAL ENGINEERING
(2016)
Article
Thermodynamics
Yu Wang, Ya-Ling He, Yin-Shi Li, Ze-Dong Cheng
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2016)
Article
Energy & Fuels
Ze-Dong Cheng, Xue-Ru Zhao, Ya-Ling He
Article
Green & Sustainable Science & Technology
Ze-Dong Cheng, Xue-Ru Zhao, Ya-Ling He, Yu Qiu
Article
Thermodynamics
Ze-Dong Cheng, Jing-Jing Men, Xue-Ru Zhao, Ya-Ling He, Yu-Bing Tao
ENERGY CONVERSION AND MANAGEMENT
(2019)
Article
Energy & Fuels
Ze-Dong Cheng, Jing-Jing Men, Shi-Cheng Liu, Ya-Ling He
Article
Energy & Fuels
Ze-Dong Cheng, Ya-Kun Leng, Jing-Jing Men, Ya-Ling He
Article
Green & Sustainable Science & Technology
Ze-Dong Cheng, Jing-Jing Men, Ya-Ling He, Yu -Bing Tao, Zhao Ma
Article
Energy & Fuels
Wen-Qi Wang, Yu Qiu, Ming-Jia Li, Ya-Ling He, Ze-Dong Cheng
Article
Energy & Fuels
Jing-Jing Men, Xue-Ru Zhao, Ze-Dong Cheng, Ya-Kun Leng, Ya-Ling He
Summary: This paper presents an efficient method for optimizing the optical performance of linear Fresnel reflector concentrators by combining multi-objective genetic algorithm and Monte Carlo ray-tracing method with an effective objective function. The optimization model has successfully optimized the optical performance of LFRCs and identified the best parameter combinations through empirical validation.
Article
Thermodynamics
Wen-Qi Wang, Ming-Jia Li, Ze-Dong Cheng, Dong Li, Zhan-Bin Liu
Summary: A coupled optical-thermal-stress numerical model based on the three-dimensional structure of the molten salt receiver is constructed to analyze its characteristics and propose a hybrid aiming strategy for the heliostat field.
Article
Mathematical & Computational Biology
Bo Yang, Min He, Xinhua Chen, Mengmeng Sun, Ting Pan, Xiaohong Xu, Xuesong Zhang, Qing Gong, Ye Zhao, Ziqi Jin, Zedong Cheng
Summary: Acupuncture has been shown to be an effective alternative treatment for Alzheimer's disease (AD), improving learning and memory abilities in mice. It regulates protein levels and cytokines, as well as influencing gut microbiota.
COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE
(2022)
Article
Thermodynamics
Wen-Qi Wang, Ming-Jia Li, Rui Jiang, Ze-Dong Cheng, Ya-Ling He
Summary: The influences of temperature variation inside molten salts on the performance of solar receivers were compared using computational fluid dynamics (CFD) method and lumped parameter method (LPM). The results showed that the rise time of outlet temperature predicted by CFD model was more than two times that of LPM model. Therefore, considering the temperature distribution within molten salt is important for predicting the transient thermal performance of receivers.
Article
Chemistry, Multidisciplinary
Na Li, Shenghan Zhang, Zedong Cheng, Wenfei Wu
Summary: The study prepared a new low-temperature NH3-SCR catalyst using Baiyun Ebo rare earth concentrate as a carrier, and found that the co-loading of Fe and Mn can greatly enhance the catalytic performance, achieving a denitrification rate of up to 94.8%. Results from XRD, SEM, BET analyses indicated that the increased acidic sites and oxygen species on the catalyst surface facilitated oxygen migration, contributing to the high catalytic activity achieved.
Article
Integrative & Complementary Medicine
Yuping Shen, Ze-Dong Cheng, Yi-Guo Chen, Rui Sun, Xian-De Ma, Guo-liang Hou, Rui Wang
EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE
(2020)
Article
Green & Sustainable Science & Technology
Cameron Bracken, Nathalie Voisin, Casey D. Burleyson, Allison M. Campbell, Z. Jason Hou, Daniel Broman
Summary: This study presents a methodology and dataset for examining compound wind and solar energy droughts, as well as the first standardized benchmark of energy droughts across the Continental United States (CONUS) for a 2020 infrastructure. The results show that compound wind and solar droughts have distinct spatial and temporal patterns across the CONUS, and the characteristics of energy droughts are regional. The study also finds that compound high load events occur more often during compound wind and solar droughts than expected.
Article
Green & Sustainable Science & Technology
Ning Zhang, Yanghao Yu, Jiawei Wu, Ershun Du, Shuming Zhang, Jinyu Xiao
Summary: This paper provides insights into the optimal configuration of CSP plants with different penetrations of wind power by proposing an unconstrained optimization model. The results suggest that large solar multiples and TES are preferred in order to maximize profit, especially when combined with high penetrations of wind and photovoltaic plants. Additionally, the study demonstrates the economy and feasibility of installing electric heaters (EH) in CSP plants, which show a linear correlation with the penetration of variable energy resources.
Article
Green & Sustainable Science & Technology
M. Szubel, K. Papis-Fraczek, S. Podlasek
Article
Green & Sustainable Science & Technology
J. Silva, J. C. Goncalves, C. Rocha, J. Vilaca, L. M. Madeira
Summary: This study investigated the methanation of CO2 in biogas and compared two different methanation reactors. The results showed that the cooled reactor without CO2 separation achieved a CO2 conversion rate of 91.8%, while the adiabatic reactors achieved conversion rates of 59.6% and 67.2%, resulting in an overall conversion rate of 93.0%. Economic analysis revealed negative net present worth values, indicating the need for government monetary incentives.
Article
Green & Sustainable Science & Technology
Yang Liu, Yonglan Xi, Xiaomei Ye, Yingpeng Zhang, Chengcheng Wang, Zhaoyan Jia, Chunhui Cao, Ting Han, Jing Du, Xiangping Kong, Zhongbing Chen
Summary: This study investigated the effect of using nanofiber membrane composites containing Prussian blue-like compound nanoparticles (PNPs) to relieve ammonia nitrogen inhibition of rural organic household waste during high-solid anaerobic digestion and increase methane production. The results showed that adding NMCs with 15% PNPs can lower the concentrations of volatile fatty acids and ammonia nitrogen, and increase methane yield.
Article
Green & Sustainable Science & Technology
Zhong Ge, Xiaodong Wang, Jian Li, Jian Xu, Jianbin Xie, Zhiyong Xie, Ruiqu Ma
Summary: This study evaluates the thermodynamic, exergy, and economic performance of a double-stage organic flash cycle (DOFC) using ten eco-friendly hydrofluoroolefins. The influences of key parameters on performance are analyzed, and the advantages of DOFC over single-stage type are quantified.
Article
Green & Sustainable Science & Technology
Nicolas Kirchner-Bossi, Fernando Porte-Agel
Summary: This study investigates the optimization of power density in wind farms and its sensitivity to the available area size. A novel genetic algorithm (PDGA) is introduced to optimize power density and turbine layout. The results show that the PDGA-driven solutions significantly reduce the levelized cost of energy (LCOE) compared to the default layout, and exhibit a convex relationship between area and LCOE or power density.
Article
Green & Sustainable Science & Technology
Chunxiao Zhang, Dongdong Li, Lin Wang, Qingpo Yang, Yutao Guo, Wei Zhang, Chao Shen, Jihong Pu
Summary: In this study, a novel reversible liquid-filled energy-saving window that effectively regulates indoor solar radiation heat gain is proposed. Experimental results show that this window can effectively reduce indoor temperature during both summer and winter seasons, while having minimal impact on indoor illuminance.
Article
Green & Sustainable Science & Technology
Alessandro L. Aguiar, Martinho Marta-Almeida, Mauro Cirano, Janini Pereira, Leticia Cotrim da Cunha
Summary: This study analyzed the Brazilian Equatorial Shelf using a high-resolution ocean model and found significant tidal variations in the area. Several hypothetical barrages were proposed with higher annual power generation than existing barrages. The study also evaluated the installation effort of these barrages.
Article
Green & Sustainable Science & Technology
Francesco Superchi, Nathan Giovannini, Antonis Moustakis, George Pechlivanoglou, Alessandro Bianchini
Summary: This study focuses on the optimization of a hybrid power station on the Tilos island in Greece, aiming to increase energy export and revenue by optimizing energy fluxes. Different scenarios are proposed to examine the impact of different agreements with the grid operator on the optimal solution.
Article
Green & Sustainable Science & Technology
Peimaneh Shirazi, Amirmohammad Behzadi, Pouria Ahmadi, Sasan Sadrizadeh
Summary: This research presents two novel energy production/storage/usage systems to reduce energy consumption and environmental effects in buildings. A biomass-fired model and a solar-driven system integrated with photovoltaic thermal (PVT) panels and a heat pump were designed and assessed. The results indicate that the solar-based system has an acceptable energy cost and the PVT-based system with a heat pump is environmentally superior. The biomass-fired system shows excellent efficiency.
Article
Green & Sustainable Science & Technology
Zihao Qi, Yingling Cai, Yunxiang Cui
Summary: This study aims to investigate the operational characteristics of the solar-ground source heat pump system (SGSHPS) in Shanghai under different operation modes. It concludes that tandem operation mode 1 is the optimal mode for winter operation in terms of energy efficiency.
Article
Green & Sustainable Science & Technology
L. Bartolucci, S. Cordiner, A. Di Carlo, A. Gallifuoco, P. Mele, V. Mulone
Summary: Spent coffee grounds are a valuable biogenic waste that can be used as a source of biofuels and valuable chemicals through pyrolysis and solvent extraction processes. The study found that heavy organic bio-oil derived from coffee grounds can be used as a carbon-rich biofuel, while solvent extraction can extract xantines and p-benzoquinone, which are important chemicals for various industries. The results highlight the promising potential of solvent extraction in improving the economic viability of coffee grounds pyrolysis-based biorefineries.
Article
Green & Sustainable Science & Technology
Luiza de Queiroz Correa, Diego Bagnis, Pedro Rabelo Melo Franco, Esly Ferreira da Costa Junior, Andrea Oliveira Souza da Costa
Summary: Building-integrated photovoltaics, especially organic solar technology, are important for reducing greenhouse gas emissions in the building sector. This study analyzed the performance of organic panels laminated in glass in a vertical installation in Latin America. Results showed that glass lamination and vertical orientation preserved the panels' performance and led to higher energy generation in winter.
Article
Green & Sustainable Science & Technology
Zhipei Hu, Shuo Jiang, Zhigao Sun, Jun Li
Summary: This study proposes innovative fin arrangements to enhance the thermal performance of latent heat storage units. Through optimization of fin distribution and prediction of transient melting behaviors, it is found that fin structures significantly influence heat transfer characteristics and melting behaviors.
