Article
Thermodynamics
Jialing Li, Zuhair R. Abdulghani, Mohammed N. Alghamdi, Kamal Sharma, Hakeem Niyas, Hazim Moria, Akbar Arsalanloo
Summary: In this study, the performance enhancement of a shell and tube latent heat thermal energy storage (LHTES) system using twisted fins was assessed. The results showed that the triple fin in vertical orientation and double fin in horizontal orientation had the best effect on melting enhancement and exergy efficiency of the phase change material.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Environmental
Xiaomang Miao, Fahid Riaz, Badr Alotaibi, Manoj Kumar Agrawal, Mohammed Abuhussain, Theyab R. Alsenani, Mansoureh Alizadeh Balderlou, Qing Lin
Summary: This study investigated the influence of spiral fins on the performance enhancement of a vertical tube-shell LHTESS in the solidification process. Different forms of fins, including quadruple, triple, double, and single fins, were studied. The triple fin case showed the best performance, while the single fin case showed the least enhancement. There was a trade-off between fin number and length of each fin in terms of performance enhancement.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Thermodynamics
Akshat Patel, Vivek Kumar Singh
Summary: This study aims to improve the energy release and storage rate of PCM heat sinks by employing a novel PCM heat sink with double-sided spiral fins. The results show that increasing the diameter and length of the fins reduces the critical temperature and time taken to reach initial conditions. The best configuration of spiral fins reduces the critical temperature and time by 7 K and 19 mins, respectively, compared to traditional pin fins.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Multidisciplinary
Mao QianJun, Cao Yan, Li Tao
Summary: This study experimentally researched and compared the thermal behavior of two thermal storage units using different heat transfer tubes. The results showed that using a spiral tube as the heat transfer tube can increase the energy storage efficiency of PCMs and shorten the melting time.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Thermodynamics
Farhad Afsharpanah, Masoud Izadi, Farzam Akbarzadeh Hamedani, Seyed Soheil Mousavi Ajarostaghi, Wahiba Yaici
Summary: Latent thermal energy storage units are widely used but suffer from slow phase change. Current research focuses on using enhancement techniques, such as porous foams, fins, and nanomaterials. Experimental results show that copper foam performs best in accelerating the phase change rate of the storage unit.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Rahul Agrawal, Krishna Deo Prasad Singh, Ravi Kumar Sharma
Summary: A novel nano-enhanced binary eutectic phase change material was prepared using a two-step method, with palmitic acid and stearic acid as base PCM and copper oxide nanomaterial as a thermal conductive enhancer in varying mass fractions. The inclusion of nanoparticles improved the thermal stability and conductivity of the PCM, making it suitable for moderate temperature energy storage applications. The findings from experiments showed that the nano-enhanced PCM had excellent thermal and chemical stability, with increased thermal conductivity at higher mass fractions of nanoparticles.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Engineering, Environmental
Daniel Lopez-Pedrajas, Ana M. Borreguero, F. Javier Ramos, Juan Francisco Rodriguez, Macarena Jimenez-Vazquez, Manuel Carmona
Summary: Phase Change Dispersions (PCDs) with large colloidal stability were produced using gum arabic (GA) and sodium dodecyl sulfate (SDS) mixtures as dispersant agent. The interplay between PCD base properties and final phase change slurry (PCS) characteristics was observed. Homogeneous PCSs were obtained from GA/SDS mass ratios of 70/30 and 40/60, while two phase products were generated from mass ratios 20/80 or 0/100. The PCS prepared with a GA/SDS mass ratio of 40/60 satisfied the European classification as nanomaterial.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
K. W. Wang, Ting Yan, L. C. Meng, W. G. Pan
Summary: The development of composite phase change materials (CPCMs) has the potential to enhance thermal conductivity and prevent leakage, thus improving the heat storage performance and contributing to efficient energy use and sustainable development.
DALTON TRANSACTIONS
(2023)
Article
Engineering, Multidisciplinary
Raja Elarem, Talal Alqahtani, Sofiene Mellouli, Gaber A. El Awadi, Salem Algarni, Lioua Kolsi
Summary: This study investigates the impact of dispersed aluminum (Al) and copper (Cu) nanoparticles on the thermophysical properties of paraffin wax. The results show that the dispersion of nanoparticles can decrease the melting temperature and increase the solidification temperature of paraffin wax. However, it also increases the dynamic viscosity and limits the dispersion. Moreover, the nanocomposites with mass fractions of 2% Al and 1% Cu exhibit better enhancements in thermal storage characteristics compared to higher mass fractions.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Muhammad Aurangzeb, Fahad Noor, Adnan Qamar, Asad Naeem Shah, Poom Kumam, Zahir Shah, Meshal Shutaywi
Summary: This study investigates the feasibility of using nano phase change materials composites to improve the slow thermal response of latent heat thermal energy storage systems. The results show that seeding nanoparticles in PCM enhances heat transfer, with carbon nanotubes performing the best. Economic and environmental analysis also reveals that carbon nanotubes in RT26 have the highest economic and environmental viability.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Liu Liu, Jing Li, Jianlei Niu, Jian-Yong Wu
Summary: PCM-in-water nano-emulsion prepared in this study showed high thermal storage capacity and energy releasing efficiency during charging and discharging processes. The flow rate of the emulsion significantly improved thermal storage performance, with volumetric thermal storage capacity during charging 50% higher than that of water, and rapid release of cooling energy during discharging process.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Somayeh Davoodabadi Farahani, Amirhossein Jazari Mamoei, As'ad Alizadeh
Summary: This study investigates the impact of phase change materials, nano-particles enhanced phase change materials, and porous foam gradients on the thermal performance of microchannel heat sinks. The results show that increasing Reynolds number and using spiral microchannels significantly enhance the thermal performance. The combination of nano-particles and phase change materials reduces thermal resistance and improves thermal performance. Among the phase change materials, ENCAPSUL demonstrates the best performance. The combination of hybrid nano-particles enhanced phase change materials increases thermal performance by approximately 9%. Using a porous medium with phase change materials decreases thermal resistance and improves thermal performance. The study also utilizes artificial intelligence techniques for thermal resistance estimation.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Elnaz Etminan, Mahdieh Alimohammadi, Ehsan Barani, Amin Taheri, Mohammad Passandideh-Fard, Mohammad Sardarabadi
Summary: Efficient and reliable methods for thermal management are required due to the small size and increased frequency of electronic devices. This study presents a passive heat sink with energy storage unit to enhance cooling performance, utilizing phase change material and nano-additive PCM.
JOURNAL OF ENERGY STORAGE
(2022)
Review
Chemistry, Multidisciplinary
Joseph D. Williams, G. P. Peterson
Summary: Phase change materials (PCMs) have garnered increased interest for their ability to absorb and store large amounts of thermal energy with minimal temperature variations. Current studies primarily focus on enhancing thermal conductivity and reducing charging/discharging times, with limited exploration into increasing latent heat and stability. Recommendations for further research include better understanding stability, identifying factors with greatest impact, and determining PCM combinations for significant increases in latent heat.
Article
Energy & Fuels
Harish Kumar Sharma, Satish Kumar, Shalendra Kumar, Sujit Kumar Verma
Summary: This research focuses on the utilization of solar energy during unstable periods by designing a storage system using nano-enhanced phase change materials (PCM). The experimental results show that the use of nano-enhanced PCM significantly improves the charging and discharging efficiency, as well as the overall exergy gain of the system. This innovative design allows for the utilization of excess thermal energy that would otherwise go to waste, making it suitable for various applications such as hot water supply and milk pasteurization.
JOURNAL OF ENERGY STORAGE
(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.