Article
Thermodynamics
Haoran Wang, Xiaofeng Ran, Yajuan Zhong, Linyuan Lu, Jun Lin, Gang He, Liang Wang, Zhimin Dai
Summary: In this study, a ternary salt/porous Si3N4 composite was prepared as a high-temperature shape-stabilized phase change material by pressure impregnation. The composite showed excellent thermal properties, including a high thermal conductivity and stability after thermal cycles, making it a promising candidate for high-temperature phase change heat storage applications.
Article
Thermodynamics
Mahesh Chand Saini, O. P. Jakhar
Summary: To meet the growing energy demand and address limited resources and increasing emissions, it is crucial to explore alternative clean energy sources and energy conservation techniques. One effective method is the micro trigeneration system combined with PCM-based thermal storage, which provides electricity, heating, and cooling in rural and remote areas. However, the system's performance can fluctuate depending on the exhaust gas temperature and engine speed, which can be minimized by utilizing the stored energy from PCM-based thermal storage during periods of low engine speed.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2023)
Article
Thermodynamics
Chaoling Han, Lidan He, Zhizheng Tian, Bo Xu, Zhenqian Chen
Summary: This study evaluated a new heat dissipation device with a composite heat sink of a loop heat pipe system for efficient cooling of electronic components. Experimental results showed that fitting a graphene copper foil heat sink significantly improved temperature performance and reduced hot spot temperatures under different heat loads. The study proposed a valuable method for improving chip cooling uniformity and heat management of the system.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Shuai Zhang, Yuying Yan
Summary: This study calculated the melting point of binary chloride salts using the molecular dynamics method, providing important fundamental thermal information for phase change heat transfer research. The study revealed the mechanism of lower melting points in small nanoclusters, where ions vibrate more intensely and crystal structures are more easily destroyed. The ion self-diffusion coefficient was also analyzed and found to not be significantly affected by the component and size of nanoclusters.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Engineering, Environmental
Kunlun Chen, Xiaolan Wei, Jing Ding, Weilong Wang, Jianfeng Lu
Summary: This study focuses on the design and preparation of Bi-Sn-In phase change material with low melting point and high cyclic stability for rapid thermal energy storage and management. The alloy exhibited excellent chemical stability and thermal performance, with slight reduction in volumetric latent heat and melting point after thermal cycles.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Pei Li, Daili Feng, Yanhui Feng, Jianrui Zhang, Yuying Yan, Xinxin Zhang
Summary: This study prepared a composite phase change material PEG/MOF-5 by using MOF-5 loaded with PEG, and investigated the thermal conductivity, melting point, and latent heat of the composite material using molecular dynamics method. The results showed that the pores of MOF-5 promote an increase in thermal conductivity and crystallinity of the composite material.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Changqing Liu, Haiping Xu, Jiawei Yang, Huaqing Xie, Wei Yu
Summary: The adjustable thermal conductivity and thermal contact resistance are crucial for efficient thermal management of electronic devices. The designed low melting-point alloy/paraffin/olefin block copolymer thermal interface material shows significantly reduced thermal contact resistance and enhanced thermal conductivity. The results demonstrate that the thermal conductivity and thermal contact resistance of the composites can be adjusted by changing the temperature.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Materials Science, Ceramics
Pavel Ferkl, Pavel Hrma, Jaroslav Klouzek, Albert A. Kruger, Richard Pokorny
Summary: A developed model of the cold cap couples heat transfer with the feed-to-glass conversion kinetics in an electric glass melter. This model allows for determining the distributions of temperature and various properties within the cold cap. The study applies this model to four melter feeds designed for nuclear wastes and investigates the effects of parameters on the cold cap thickness and heating rate profile.
INTERNATIONAL JOURNAL OF APPLIED GLASS SCIENCE
(2023)
Article
Energy & Fuels
Y. Li, S. H. Zhou, S. Wang, K. Q. Ma, Q. Z. Zhu
Summary: In this study, a novel ternary mixed molten salt of NaNO3-LiNO3-NaCl with high latent heat was prepared and studied to improve the thermal properties of nitrate in medium temperature thermal storage. Experimental results showed that compared with pure NaNO3, the phase change temperature of NaNO3-LiNO3-NaCl was reduced by 45.3 degrees C, and the latent heat of phase change was increased by 59.4 J/g. The addition of expanded graphite (EG) as the carrier adsorption material greatly improved the heat transfer capacity of the ternary molten salt, making NaNO3-LiNO3-NaCl/EG have broad application prospects in the field of medium and high temperature heat storage.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Kabeer Raza, Syed Sohail Akhtar, Abba A. Abubakar, Ahmed Mohammed Alqahtani, Syed M. Zubair, AbulFazal M. Arif
Summary: In this study, thermal-hydraulic design and composite material design are combined to develop polymer composite tube materials for heat exchanger applications. The analysis shows that the thermal conductivity of tubes is a limiting factor for liquid-liquid applications. To achieve the desired thermal conductivity, high volume fractions of thermally conductive fillers need to be incorporated in a polymer matrix.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Anna Staszczuk, Tadeusz Kuczynski
Summary: This study compares the effects of PCM and reinforced concrete on the summer thermal performance of existing buildings, finding that reinforced concrete improves thermal performance significantly, while PCM may solidify during heat waves. It may not be possible to plan an optimum range of PCM melting temperatures effective throughout all summer months in a building without air conditioning.
Article
Materials Science, Ceramics
Qizhong Li, Zhangpeng Meng, Bing Xiao, Jiaojiao Li, Kai Liu, Meijun Yang, Song Zhang, Takashi Goto, Rong Tu
Summary: HfC-HfB2-SiC composites were prepared by arc melting, with a ternary eutectic composition identified and displaying a complex microstructure. The composite exhibited high hardness and fracture toughness at elevated temperatures, with varying electrical and thermal conductivity at different temperature ranges.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Energy & Fuels
Wenjuan Qiu, Yu Bai, Yutang Fang, Shuangfeng Wang
Summary: In this study, two novel eutectic mixtures were successfully obtained by adding erythritol into aluminum sulfate salts, resulting in manipulated melting temperatures while maintaining high latent heat. Among them, the Alum-E/EG composite showed excellent thermal conductivity and leakage prevention, making it a promising candidate for various applications.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Chemistry, Multidisciplinary
Hua Fei, Jiahong Zhou, Qian He, Linya Wang, Ximei Liang, Yucheng Pan
Summary: The phase change materials MA-PA-TD/EG and MA-SA-LA/EG were evenly distributed in expanded graphite, showing good stability and thermal stability. Moreover, MA-PA-TD/EG was 67% faster than MA-PA-TD in solid-liquid phase change, and MA-SA-LA/EG was 63% faster than MA-SA-LA, indicating their potential application in buildings.
Article
Construction & Building Technology
Xin Jin, Qiuke Xiao, Tao Xu, Gongsheng Huang, Huijun Wu, Dengjia Wang, Yanfeng Liu, Hongguo Zhang, Alvin C. K. Lai
Summary: A novel composite phase-change material, SAT-KCl-urea/EG, was developed for energy-efficient heat pump latent heat thermal energy storage systems, demonstrating excellent thermal performance and phase-change properties.
ENERGY AND BUILDINGS
(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.