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
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
Energy & Fuels
Dongqiang Lei, Yucong Ren, Zhifeng Wang
Summary: This paper investigates the heat loss mechanism in the parabolic trough receiver by analyzing conduction and radiation heat losses. A 2-D heat transfer model is established and various factors are analyzed to understand their effects on heat losses. The findings provide a theoretical basis for improving the receiver and reducing heat loss in operation and maintenance.
FRONTIERS IN ENERGY
(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
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
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
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
Peng Liu, Zhimin Dong, Hui Xiao, Zhichun Liu, Wei Liu
Summary: The novel solar cascade heat collection system based on a PTR with double tube and two heat transfer fluids shows significant improvements in heat collecting performance, with reduced absorber tube temperatures, enhanced heat transfer coefficients, and decreased heat loss. This system offers potential for increased energy efficiency and lower environmental impact in electricity production and water desalination in remote arid areas.
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
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
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
Thermodynamics
Li Xu, Feihu Sun, Linrui Ma, Xiaolei Li, Guofeng Yuan, Dongqiang Lei, Huibin Zhu, Qiangqiang Zhang, Ershu Xu, Zhifeng Wang
Article
Energy & Fuels
Li Xu, Zhifeng Wang, Xin Li, Guofeng Yuan, Feihu Sun, Dongqiang Lei, Shidong Li
Article
Energy & Fuels
Yu Liu, Zhifeng Wang, Dongqiang Lei, Cong Wang
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2014)
Article
Energy & Fuels
Li Xu, Feihu Sun, Linrui Ma, Xiaolei Li, Dongqiang Lei, Guofeng Yuan, Huibin Zhu, Qiangqiang Zhang, Ershu Xu, Zhifeng Wang
Article
Green & Sustainable Science & Technology
Dongqiang Lei, Xuqiang Fu, Yucong Ren, Fangyuan Yao, Zhifeng Wang
Article
Energy & Fuels
Linrui Ma, Zhifeng Wang, Dongqiang Lei, Li Xu
Article
Energy & Fuels
Fangyuan Yao, Dongqiang Lei, Ke Yu, Yingying Han, Pan Yao, Zhifeng Wang, Quanxi Fang, Qiao Hu
Article
Energy & Fuels
Zhifeng Wang, Jiani Wu, Dongqiang Lei, Hong Liu, Jinping Li, Zhiyong Wu
Article
Energy & Fuels
Dongqiang Lei, Yucong Ren, Zhifeng Wang
Summary: This paper investigates the heat loss mechanism in the parabolic trough receiver by analyzing conduction and radiation heat losses. A 2-D heat transfer model is established and various factors are analyzed to understand their effects on heat losses. The findings provide a theoretical basis for improving the receiver and reducing heat loss in operation and maintenance.
FRONTIERS IN ENERGY
(2022)
Proceedings Paper
Energy & Fuels
Yucong Ren, Dongqiang Lei, Fangyuan Yao, Zhifeng Wang
SOLARPACES 2018: INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS
(2019)
Proceedings Paper
Green & Sustainable Science & Technology
Dongqiang Lei, Xuqiang Fu, Dongming Zhao, Guofeng Yuan, Zhifeng Wang, Minghuan Guo
INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS (SOLARPACES 2016)
(2017)
Article
Thermodynamics
Dongming Zhao, Zhifeng Wang, Ershu Xu, Lingzhi Zhu, Dongqiang Lei, Li Xu, Guofeng Yuan
APPLIED THERMAL ENGINEERING
(2017)
Proceedings Paper
Energy & Fuels
D. Zhao, E. Xu, Q. Yu, D. Lei
INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS, SOLARPACES 2014
(2015)
Proceedings Paper
Energy & Fuels
D. Q. Lei, Z. F. Wang, Z. J. Wang
PROCEEDINGS OF THE SOLARPACES 2013 INTERNATIONAL CONFERENCE
(2014)
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.