Article
Thermodynamics
Mohammad Mahdi Heyhat, Murtadha Zahi Khattar
Summary: The paper investigates the impact of different placement schemes of porous foam on the thermal efficiency of a direct absorption solar collector. Ten different layouts of open cell copper porous foam are examined. The results show that placing the foam in the lower half of the absorber tube leads to higher thermal efficiency. The peripheral placement of porous foam is preferred considering the performance index, and higher pore density (PPI) can result in higher thermal efficiency.
Article
Thermodynamics
Caiyan Qin, Jungchul Lee, Bong Jae Lee
Summary: By using a semi-cylindrical absorbing coating in the DAPTSC, both volumetric and surface absorption of solar radiation can be achieved, leading to significantly higher thermal efficiency compared to the design with a reflective coating, especially when the absorption coefficients of the nanofluids are low. This presents a new opportunity for further reducing the nanoparticle concentration in a DAPTSC.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Dan Zheng, Jin Yao, Hengxuan Zhu, Jin Wang, Chungen Yin
Summary: By using magnetic nanofluids as the thermal medium, a parabolic trough direct absorption solar collector has improved surface absorption and solar energy utilization. Experimental results show significant improvements in heat transfer, thermal efficiency, and exergy efficiency compared to deionized water when using a magnetic nanofluid with a nanoparticle concentration of 0.2wt%. Furthermore, when exposed to S-S magnetic fields, the performance of the magnetic nanofluid is further enhanced. The results have important implications for designing and optimizing direct absorption solar collectors.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
Mohamed Elmnefi, Waqas Al-Khazraji
Summary: This study aims to enhance the thermal efficiency and reduce the cost of parabolic trough solar collectors (PTSC) by investigating the effects of different operating conditions. A novel configuration using a noncirculated nanofluid was designed to absorb solar radiation. Computational fluid dynamics simulations and experimental tests were conducted to compare the performance of single and triple copper tube models. The findings showed that the single copper tube model had superior performance and achieved a maximum thermal efficiency of 55.31%.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2023)
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
Engineering, Multidisciplinary
R. P. Praveen, Kotturu V. V. Chandra Mouli
Summary: This paper proposes an optimization approach using fuzzy non-linear programming based on Genetic algorithm to enhance the performance of commercial parabolic trough collector solar thermal power plants. The research shows that the proposed approach can achieve higher plant efficiency and capacity factor, and provide guidance for decision makers in choosing the ideal solar thermal technology for specific locations.
AIN SHAMS ENGINEERING JOURNAL
(2022)
Article
Green & Sustainable Science & Technology
Ashokkumar Shyam, Kalilur Rahiman Arshad Ahmed, Sathiya Satchi Christopher, Selvarasan Iniyan
Summary: This study presents an improved thermal performance of a solar parabolic trough collector through the optimization of secondary optics. The experimental results show that the proposed model outperforms the standard one, with higher thermal efficiency and heat transfer coefficient.
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(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
Green & Sustainable Science & Technology
M. Medhat El-Bakry, Mahmoud A. Kassem, Muhammed A. Hassan
Summary: Boosting the optical and thermal efficiencies of parabolic trough concentrators is gaining global interest. This study proposes a new design with floating radiation heat shields to enhance energy and exergy efficiencies. The configuration with a diameter of 75 mm and a shading angle of 150 degrees showed the highest improvement ratios.
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
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
Environmental Sciences
Iman Tolouei, Ehsan Tolouei, Saber Yekani Motlagh, Farrokh Mobadersani
Summary: Research suggests that utilizing nanofluids can significantly enhance the thermal performance of solar collectors, with increasing nanofluid volume fraction and flow rate leading to higher maximum temperature and efficiency. Various parameters such as nanoparticle volume fraction, flow rate, and type have been found to affect the collector's thermal and electrical efficiencies, thermal distribution, and entropy production.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Energy & Fuels
Yu Qiu, Yucong Xu, Qing Li, Jikang Wang, Qiliang Wang, Bin Liu
Summary: The parabolic trough collector with a modified receiver enhanced by solar and hot mirrors can achieve higher optical efficiency compared to conventional receivers, especially under high irradiance and low temperature conditions. The addition of solar and hot mirrors can effectively improve the optical-thermal efficiency of the collector.
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
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.