Article
Thermodynamics
Tingting Yao, Jie Ji, Zhaomeng Li, Xin Wen
Summary: This study proposes a novel heat exchanger design to address the limitations of traditional photovoltaic/thermal systems, and explores its performance through experiments and mathematical modeling. The experimental results show significant advantages of the new heat exchanger in improving system efficiency, and predict performance differences under different solar radiation and ambient temperature conditions.
APPLIED THERMAL ENGINEERING
(2023)
Article
Agriculture, Multidisciplinary
Tarik Hadibi, Abdelghani Boubekri, Djamel Mennouche, Abderrahmane Benhamza, Anil Kumar
Summary: The integration of GWHE significantly increases drying temperature, ensures continuous drying process and reduces drying time. The economic analysis shows high feasibility for the hybrid dryer with a short payback period.
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
(2021)
Article
Thermodynamics
Avinash Kumar Yadav, Indranil Ghosh
Summary: This article examines the design, fabrication, and testing of a miniature, compact, laboratory-scale prototype of a spirally wound multilayer tubular heat exchanger, discussing the potential for miniaturization and outlining the advantages and disadvantages. Experimental results show good agreement with theoretical predictions.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Zhiying Song, Jie Ji, Yuzhe Zhang, Jingyong Cai, Zhaomeng Li
Summary: A photovoltaic heat pump system was tested under different weather conditions, showing that water temperature rise leads to a decrease in heat capacity and performance coefficient. The output of the thermoelectric generator is influenced by irradiance conditions, and enhancing parameters and photovoltaic evaporating area can improve system performance.
Article
Thermodynamics
Sayed M. Eldin, Mohana Alanazi, Abdulaziz Alanazi, Sultan Alqahtani, Sultan Alshehery, Ali E. Anqi
Summary: Wasted hot exhaust gas in thermodynamic engineering systems can be converted into electricity through different techniques. This research significantly improves the performance of tubular thermoelectric heat recovery by using a novel fin-pin-porous based heat exchanger. The proposed integrated structure can enhance the output power of the recovery system up to 45%-110% compared to the conventional smooth channel-based tubular thermoelectric generator. A comparative case study is conducted between the new proposed system and conventional smooth structure from different viewpoints including power generation, conversion efficiency, pumping power and economic cost.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Minghui Ge, Yuntong Zhao, Yanzhe Li, Wei He, Liyao Xie, Yulong Zhao
Summary: This study investigated the influence of the structural parameters of a thermoelectric generator on the system efficiency of a photovoltaic-thermoelectric hybrid system. An optimal structural parameter for the TEG was identified, along with an analysis of its relationship with CPV temperature coefficient, concentration ratio, and cooling heat transfer coefficient.
Article
Chemistry, Multidisciplinary
Zunce Wang, Yimin Wang, Jinglong Zhang, Sen Li, Yan Xu
Summary: This study numerically investigates the turbulent flow and heat transfer performance of a tubular heat exchanger with a dimpled inner tube. The results demonstrate that the flow vortex in the concave dimple and the shock induced by the protrusion dimple are the main reasons for the enhancement of heat transfer ability. Compared to a smooth-walled tube, the maximum increase in heat transfer is 1.94 times in the concave dimple region and 2.74 times in the protrusion dimple region. By comparing different sizes of heat exchange pipes, it is determined that a structure with inner and outer wall dimple sizes of 10-15 mm exhibits better comprehensive heat transfer performance.
APPLIED SCIENCES-BASEL
(2022)
Article
Energy & Fuels
Mohammed A. Qasim, Vladimir I. Velkin, Sergey E. Shcheklein
Summary: This paper experimentally investigates the maximum voltage generation of a thermoelectric generator (TEG) panel in a hot environment, revealing the potential of solar energy generation in such conditions.
Article
Thermodynamics
Suabsakul Gururatana, Rotchana Prapainop, Sathaporn Chuepeng, Sompol Skullong
Summary: The experimental results showed that using the improved NACA0024 vortex generator can produce the best heat transfer enhancement effect inside the tube heat exchanger. The empirical associations for Nusselt number, friction factor, and heat transfer enhancement performance were matched with investigational data.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Radek Guras, Miroslav Mahdal, Marian Bojko
Summary: This article discusses the CFD simulation of a unique liquid cooling device that combines a two-circuit liquid cooling system with an accumulator and a cooling core consisting of Peltier modules. The simulation aims to predict cooling time, model media flow, and determine the efficiency of the device. The device achieved cooling of 2L of media in slightly over 40 min with an overall efficiency of 14.376%.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Sepehr Sanaye, Ali Shourabi, Daryoosh Borzuei
Summary: An innovative thermoelectric-based atmospheric water harvesting system is proposed, which utilizes cold and hot surfaces of thermoelectric units to reduce air temperature and recover cooling effect. The system demonstrates lower water production cost and energy consumption compared to previous research activities in atmospheric water harvesting. Additionally, economic analysis shows favorable economic viability for the system. This research contributes to sustainable water production by presenting a thermoelectric-based water harvesting system with superior performance and economic feasibility.
Article
Green & Sustainable Science & Technology
Lok Shun Chan
Summary: This study investigates the impact of neighboring shading effect (NSE) on the performance of photovoltaic (PV) systems and reveals significant variations in PV electricity generation and energy payback time across cities at different latitudes. It recommends that green building certification schemes should include the consideration of NSE in evaluating the performance of rooftop PV systems.
Article
Thermodynamics
Muhammed Musthafa, Indranil Ghosh
Summary: This paper presents a genetic algorithm based optimization method for spirally wound two-fluid stream exchangers, which can optimize weight, height, or thermo-hydraulic performances according to customer requirements. The study explores the effects of minimum weight or height and variation in pressure drop constraints on the optimized design.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Jie Chen, Ruochen Wang, Ding Luo, Weiqi Zhou
Summary: In this study, a segmented converging thermoelectric generator is proposed and optimized, leading to a significant improvement in output power by making the temperature differences of thermoelectric modules in all segments approximately identical.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Xin Wen, Jie Ji, Zhaomeng Li, Zhiying Song, Tingting Yao
Summary: A concentrated photovoltaic/thermal system with micro-channel heat pipes and thermoelectric generators was constructed. Experimental work demonstrated the feasibility of the system and validated the mathematical model. A simulation study investigated the impact of adding a glass cover and the volume of the water tank, showing improvements in electrical efficiency and temperature with some trade-offs between electrical and thermal performance.
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.