Article
Energy & Fuels
Lili Jiang, Le Zhao, Guangyuan Chen, Meixia Li, Ruijia Zhang
Summary: In this study, octadecylamine/graphite foam composite phase change materials (ODA/GF CPCMs) with excellent thermal properties and stability were prepared by vacuum impregnation, making them suitable for energy storage applications.
Article
Thermodynamics
Talal Alqahtani
Summary: This study aims to assess the performance of the Hybrid Solar Thermal Storage (HSTS) system, which combines latent phase change material and thermochemical storage system. Three storage system designs are proposed and numerically investigated, and key performance indicators such as volumetric storage capacity and energy storage efficiency are used to evaluate them. The results show that integrating a reaction heat recovery internal system based on Na3Al as PCM can significantly improve the energy storage efficiency of the HSTS system, and using a PCM in truncated hollow cones can reduce heat charging and discharging time, increase storage capacity, and specific power.
APPLIED THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Salwa Bouadila, Tauseef-ur Rehman, Maughal Ahmed Ali Baig, Safa Skouri, Sara Baddadi
Summary: Evacuated tube solar collectors are technically viable and economically attractive for solar water heating. However, they suffer from heat and water losses along the manifold. To address this issue, Phase Change Materials (PCMs) have been integrated into the collectors. This paper presents three modified collectors and compares their performance through energy and exergy analysis, as well as economic evaluation.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Article
Energy & Fuels
Hesam Ami Ahmadi, Nazanin Variji, Amirreza Kaabinejadian, Mahdi Moghimi, Majid Siavashi
Summary: This study proposes the use of gradient metal foams to optimize phase change materials and achieve higher efficiency in thermal energy storage units. Numerical simulations were conducted to investigate the impact of gradient porosity on the performance of TES, resulting in improvements in charging time and total entropy generation.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Energy & Fuels
Ersin Alptekin, Mehmet Akif Ezan
Summary: This study focuses on investigating the charging performance of the solar-aided packed-bed latent heat TES system using a mathematical model to simulate heat transfer phenomena. The model is validated with experimental and numerical results, and it is found that decreasing the capsule diameter and increasing the HTF’s mass flow rate has a positive effect on system indicators.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Energy & Fuels
Zakaria Elmaazouzi, Imad Ait Laasri, Ayoub Gounni, Mustapha El Alami, Abdelkader Outzourhit, El Ghali Bennouna
Summary: The main objective of this study is to improve the heat transfer of three cylindrical shell and tube exchangers through the use of different finned structures. A novel honeycomb based finned structure is compared to circular and longitudinal finned structures. The thickness and number of fins for each geometry are studied, with a focus on the impact of the fin thickness on thermal performance.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
K. Chopra, V. V. Tyagi, A. K. Pandey, Zhenjun Ma, Haoshan Ren
Summary: The study compared the performance of evacuated tube collectors with and without latent heat storage material, with palmitic acid used as the storage material. The collector with storage showed significant improvements in daily thermal and exergy efficiencies, as well as reduced environmental impact in terms of CO2 emissions compared to the collector without storage. Additionally, the collector with storage generated higher revenues based on energy and exergy approaches.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Green & Sustainable Science & Technology
K. Chopra, V. V. Tyagi, A. K. Pandey, Sakshi Popli, Gurjeet Singh, R. K. Sharma, Ahmet Sari
Summary: The incorporation of stearic acid into heat pipe ETC can overcome challenges such as low heat transfer rate, overheating, and inability to supply hot water during off-pick hours. It improves energy and exergy efficiency and reduces CO2 emissions.
Article
Energy & Fuels
Hatem Ahmad Aljaerani, M. Samykano, A. K. Pandey, Zafar Said, K. Sudhakar, R. Saidur
Summary: This research synthesized a novel composite of Titanium Dioxide nanoparticles and the ternary nitrate molten salt (HITEC), which, when added at a concentration of 0.1 wt%, significantly enhanced the specific heat capacity, latent heat, and upper working temperature of HITEC. The nanocomposite also exhibited excellent thermal cycling stability and chemical stability.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Dhandapani Sathish, Selvaraj Jegadheeswaran, Murugan Veeramanikandan
Summary: This research focuses on enhancing the productivity of a hemispherical solar desalination system by employing external dual reflectors, thermal conductivity enhanced latent heat storage medium and an insulator cover on the top surface. The experimental study conducted in India shows that the modified system can enhance productivity by 115% and energy efficiency by more than 100%. The results also indicate that the proposed system is economically viable with reduced cost and payback compared to the conventional system.
APPLIED THERMAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Om Prakash, Anil Kumar, Samsher, Kumaresh Dey, Ankish Amu
Summary: This research discusses the exergy and energy analysis of a innovative solar air heater with sensible heat storage. The experiments and performance analysis show that the system operated under induced forced convection mode with a reflector has the best heat performance, making it highly suitable for low-temperature applications.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Chemistry, Multidisciplinary
Xiao-Hua Hu, Rui Zhang, Zhiyong Wu, Shisheng Xiong
Summary: A green and straightforward method has been developed to produce graphene directly from common biomass materials using concentrated solar radiation. The resulting graphene, named concentrated-solar-induced graphene (CSIG), exhibits excellent properties and strong antibacterial potential against Escherichia coli. This method provides a new route for large-scale production of graphene materials from low-cost biomass materials, turning waste into useful materials.
Article
Thermodynamics
Mohammad Ghalambaz, Mehdi Fteiti, Obai Younis, Mikhail Sheremet, Hiba A. Hasan
Summary: This study investigates the influence of metal foam layer configurations on the melting time and energy storage performance of LHTES systems. The results show that the best configuration is to horizontally split the foam layers at the top of the storage unit and use a light foam layer (high porosity metal foam), which can complete the charging process 32% faster compared to placing the light foam layer at the bottom.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Jiayue Kong, Hongyang Zuo, Kuo Zeng, Yongwen Lu, Huaqian Xu, Xiong Zhang, Haiping Yang, Hanping Chen
Summary: The use of metal foam strengthened latent heat thermal energy storage (LTES) can promote the development of renewable energy and waste heat recovery. This study establishes the superposition method and 2D iterative method to optimize the 2D porosity gradient of metal foam infiltrated in phase change material (PCM) for enhanced heat transfer in LTES. The numerical investigation shows that the optimal case obtained by the 2D iterative method has the best heat transfer performance among different methods.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Ju-Yeol Ryu, Adrian Alford, Graham Lewis, Yulong Ding, Yunren Li, Abdalqader Ahmad, Hyunjong Kim, Sung-Ho Park, Jong-Po Park, Simon Branch, Seunghan Yu, Changkook Ryu
Summary: This paper proposes a novel stand-alone liquid air energy storage (LAES) system that enhances round-trip efficiency using a thermal energy storage system. The system effectively increases cold energy recycle by utilizing cryogenic phase change material and quartz for heat storage. A sensitivity analysis shows that the implementation of energy recycling leads to a higher round-trip efficiency compared to the base case of the LAES system.
APPLIED THERMAL ENGINEERING
(2022)
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.