Article
Thermodynamics
Nagham Ismail, Djamel Ouahrani
Summary: The personalized cooling radiant cubicle (PCRC) combined with a conventional HVAC system can maintain a comfortable microclimate in office rooms in hot climates, reduce thermal asymmetry, improve predicted dissatisfaction index, and save energy with a payback period between 6 and 7 years.
Article
Thermodynamics
Mohamed G. Gado, Tamer F. Megahed, Shinichi Ookawarad, Sameh Nada, Ibrahim I. El-Sharkawy
Summary: The study examines the energetic and economic feasibility of three configurations of a solar-driven hybrid adsorption-compression cooling system using typical meteorological data of Cairo, Egypt. Configuration-I can substantially reduce electricity consumption, Configuration-II achieves net-zero electricity consumption, and Configuration-III saves energy costs.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Engineering, Chemical
Juan Rios-Arriola, Nicolas Velazquez-Limon, Jesus Armando Aguilar-Jimenez, Saul Islas, Juan Daniel Lopez-Sanchez, Francisco Javier Caballero-Talamantes, Jose Armando Corona-Sanchez, Cristian Ascencion Casares-De la Torre
Summary: This study evaluates the potential of using an underground thermal energy storage tank supplied by solar thermal collectors to provide hot water for a single-effect absorption cooling system. The simulation results show that the underground tank reduces thermal energy losses by 27.6% and saves 639 kWh of electrical energy due to reduced pumping time.
Article
Energy & Fuels
Rana Veer Pratap Singh, Jyotirmay Mathur, Mahabir Bhandari
Summary: This study experimentally investigated the performance of an energy storage system retrofitted to a ceiling-type radiant cooling system, achieving energy savings and cost savings through different charging and discharging schedules. Results showed energy savings of 3% to 14% in hot and dry climate conditions, with energy cost savings ranging from 17.5% to 22.4% using a time-of-day electricity tariff plan.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Energy & Fuels
Alberto Cerezo-Narvaez, Maria-Jose Bastante-Ceca, Jose-Maria Pinero-Vilela
Summary: Buildings in Europe account for over one third of total energy demands and greenhouse gas emissions. The EU and Spain have implemented directives to improve energy efficiency in buildings. The study on single-family homes in Spain shows that utilizing photovoltaic and solar thermal technologies can significantly reduce energy consumption and emissions, providing valuable insights for policymakers and industry professionals.
Article
Multidisciplinary Sciences
Shancheng Wang, Tengyao Jiang, Yun Meng, Ronggui Yang, Gang Tan, Yi Long
Summary: Researches have developed scalable smart windows that can automatically regulate radiative cooling capacity while maintaining transparency and modulating performance, suitable for self-adapting applications in different climate zones.
Article
Thermodynamics
Mehmet Gursoy, Ibrahim Dincer
Summary: A unique integrated energy system driven by solar power is proposed in this study, which can provide power, hot water, cooling, and heating for residential buildings and greenhouses. The system's performance is evaluated using energy and exergy analysis, and the effects of changing various operating parameters are examined through parametric studies.
Review
Construction & Building Technology
Shayan Naderi, Gloria Pignatta, Simon Heslop, Iain MacGill, Dong Chen
Summary: The increasing use of air-conditioners and extreme weather conditions are straining electricity networks worldwide, leading to additional peak demands. Pre-cooling buildings and utilizing solar energy for cooling are potential strategies to reduce peak demands. However, existing literature lacks comprehensive reviews on the shifting of peak demands and cost reduction. This article provides an overview of the latest studies from 2014 to 2021 in the field of pre-cooling and solar pre-cooling, along with the necessary steps for designing and implementing these strategies.
ENERGY AND BUILDINGS
(2022)
Article
Chemistry, Physical
Zhengui Zhou, Yunsheng Fang, Xin Wang, Erqi Yang, Rong Liu, Xishu Zhou, Zhen Huang, Hanzhi Yin, Jun Zhou, Bin Hu
Summary: Current technologies mainly focus on solar radiation modulation, while the proposed dynamic window can synergistically modulate solar and thermal radiation to improve energy efficiency. The prototype has shown significant improvements in solar transmittance and midinfrared thermal emittance, leading to potential annual energy savings for midrise buildings globally.
Article
Thermodynamics
Gamal Hashem, Khamid Mahkamov, Basim Belgasim, Nabil Elsharif, Irina Makhkamova
Summary: The study focuses on the development of a novel cooling system that utilizes solar thermal energy efficiently, combining a liquid piston engine and cooling machine. The system performance was evaluated under various operating conditions, showing promising results in terms of cooling capacity and engine efficiency.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Chemistry, Multidisciplinary
Xinpeng Zhao, Ablimit Aili, Dongliang Zhao, Dikai Xu, Xiaobo Yin, Ronggui Yang
Summary: Dynamic control of sunlight entering a building through switchable glazing panels can effectively reduce building energy consumption. The dual-mode glazing panel demonstrated in this study achieved significant cooling and heating performance, leading to potential energy savings in office buildings.
CELL REPORTS PHYSICAL SCIENCE
(2022)
Article
Thermodynamics
Muhammad Zeeshan Siddique, Abdul Waheed Badar, M. Salman Siddiqui, Fahad Sarfraz Butt, Muhammad Saleem, Khalid Mahmood, Imran Fazal
Summary: This study simulates and analyzes the energy consumption of heating and/or cooling auxiliary devices in solar sorption cooling systems and investigates the influence of series versus parallel arrangement of solar collectors. The results demonstrate that configuration-2 (C-2) achieves higher primary energy savings and solar fraction at lower collector areas.
Article
Thermodynamics
Tingzhen Ming, Xinyuan Ding, Chuanjie Shi, Qiong Chen, Caixia Wang, Qianjun Mao, Yanping Yuan, Gangfeng Tan, Yongjia Wu
Summary: In this study, the efficiency of the planar cooler was increased by 35% through rational thermal management measures. The effects of directional shading, mobile shading, and directional (northward) radiation were investigated. Outdoor experiments conducted in Wuhan, China achieved an effective cooling of 3.9-13.1 degrees C. The combination of solar and thermal management measures has a certain impact on the use of radiative cooling in building energy efficiency.
APPLIED THERMAL ENGINEERING
(2023)
Review
Chemistry, Multidisciplinary
Shiqing Zhou, Pengyue Chen, Chunhong Xiao, Yuqing Ge, Hongwen Gao
Summary: Thermal management, especially in dynamic and variable environments, is crucial for human activities. This review summarizes the latest advances in low-energy or even zero-energy thermal-management technologies and discusses the challenges and opportunities in this field. The focus is on daytime passive radiative cooling and dual-mode systems for both cooling and heating applications.
Article
Optics
Wei Xiao, Peng Dai, H. Johnson Singh, Idris A. Ajia, Xingzhao Yan, Peter R. Wiecha, Ruomeng Huang, C. H. (Kees) de Groot, Otto L. Muskens, Kai Sun
Summary: This study utilizes a genetic algorithm and a transfer matrix method to design and optimize a multimaterial thin-film OSR for broadband radiative cooling. The optimized structure, consisting of 18 alternating layers of SiN, SiO2, and Ta2O5 on an Al mirror backreflector, exhibits low solar absorption and high broadband infrared emissivity. The fabricated OSR demonstrates good thermal-optical properties and achieves efficient net cooling power under one sun total solar irradiance in space.
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.