Article
Engineering, Environmental
Amirreza Ebrahimi, Ehsan Houshfar
Summary: This study evaluated the advantages of integrating pyrolysis and anaerobic digestion in terms of energy/exergy efficiency, and proposed optimizing the chemical composition of biomass feedstock to maximize production. The results showed that the integrated system had a higher exergy efficiency, indicating that the combination of pyrolysis and anaerobic digestion can improve process efficiency.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Energy & Fuels
Sareh Daneshgar, Rahim Zahedi
Summary: In this paper, the gas microturbine cycle was optimized in dual power and heat generation mode. The optimal point for system performance was determined using the bee algorithm, and the results showed improvements in energy efficiency and economics. Some conclusions were also drawn based on the findings.
Article
Thermodynamics
Xiaohui Zhong, Tao Chen, Xiangyu Sun, Juanjuan Song, Jiajun Zeng
Summary: This study conducted exergy analysis on a novel wind-to-heat system and investigated its thermodynamic performances using experimental data. The wind turbine and the compressor of the heat pump subsystem were found to be the most critical components in the system. Through mathematical modeling and exergy analysis, it was discovered that the system's exergy destruction could be reduced by optimizing internal structure parameters and considering interactions with other components.
Article
Thermodynamics
Hirakh Jyoti Das, Rituraj Saikia, Pinakeswar Mahanta
Summary: A thermo-economic assessment was conducted on three atmospheric bubbling fluidized bed paddy dryers to investigate the effects of inlet air temperature, superficial air velocity, and amount of paddy on exergy efficiency at the equilibrium moisture content (EMC). The study found that dryers with a larger cone angle and shorter payback period had higher annual profits.
Article
Thermodynamics
F. Panahizadeh, M. Hamzehei, M. Farzaneh-Gord, A. A. V. Ochoa
Summary: The study conducted energy, exergy, and economic analysis on a network of single-effect absorption chillers in the Marun Petrochemical Company in Iran. Results showed that adjusting the cooling water temperature and the solution heat exchanger efficiency can significantly improve the energy and exergy performance coefficients while reducing the annual cost.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Green & Sustainable Science & Technology
Saeed Abdul-Ganiyu, David A. Quansah, Emmanuel W. Ramde, Razak Seidu, Muyiwa S. Adaramola
Summary: This study compares the technical and economic performance of a hybrid water-based mono-crystalline silicon photovoltaic-thermal module with a conventional mono-crystalline silicon photovoltaic module in Ghana. Results show that the PVT system performs better when installed with batteries, while the PV system is more economically viable without batteries.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Environmental Sciences
Priscilla de Souza Almeida, Camila Aparecida de Menezes, Isabela Mehi Gaspari Augusto, Ana Paula Paulinetti, Giovanna Lovato, Jose Alberto Domingues Rodrigues, Edson Luiz Silva
Summary: This study analyzed the technical and economic feasibility of waste co-digestion and two-stage systems for the production of hydrogen and methane. The results showed that high-temperature single-stage systems and high-temperature/medium-temperature two-stage systems were more compact and required lower initial investment. Risk analysis revealed low investment risks, with electricity sales price being the key determining factor. Factorial design showed that rising inflation and electricity sales price positively affected the net present value, while rising capitalization rate had a negative impact.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Thermodynamics
E. Cano-Pleite, F. Hernandez-Jimenez, L. M. Garcia-Gutierrez, A. Soria-Verdugo
Summary: Concentrated solar power technologies should be coupled with large Thermal Energy Storage (TES) systems to ensure uniform electricity production. Sensible heat storage in granular material is a common technique used in TES systems due to its simplicity. A novel confined bed structure is proposed in this study to mechanically prevent solid particles from moving even at high fluid velocities during discharge, resulting in maximum exhaust fluid temperature. An analytical model is used to describe the evolution of the thermocline and the effect of operating parameters on its thickness. The confined bed TES system is optimized based on thermodynamic and economic factors, resulting in low fluid velocities and bed aspect ratios to prevent excessive pressure drops.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Lulin Luo, Lidi Lu, Xuelian Shen, Jinhua Chen, Yang Pan, Yuchen Wang, Qing Luo
Summary: This study designed and simulated a polygeneration system that integrates a ground source heat pump and anaerobic digestion units for co-generation of cooling, heating, and biogas. The investigation in a rural village in Chongqing, China showed that the integrated system can save energy and costs compared to separated and current systems. Increasing the operating temperature of the heat pump improved exergy efficiency but decreased overall energy efficiency ratio. Increasing the coefficient of performance of heat pump units enhanced energy and exergy efficiency.
Review
Green & Sustainable Science & Technology
Salman Soltanian, Soteris A. Kalogirou, Meisam Ranjbari, Hamid Amiri, Omid Mahian, Benyamin Khoshnevisan, Tahereh Jafary, Abdul-Sattar Nizami, Vijai Kumar Gupta, Siavash Aghaei, Wanxi Peng, Meisam Tabatabaei, Mortaza Aghbashlo
Summary: The growing volume of municipal solid waste (MSW) generated worldwide often undergoes open dumping, landfilling, or uncontrolled burning, releasing massive pollutants and pathogens into the soil, water, and air. On the other hand, MSW can be used as a valuable feedstock in biological and thermochemical conversion processes to produce bioenergy carriers, biofuels, and biochemicals in line with the United Nations' Sustainable Development Goals (SDGs). Valorizing MSW using advanced technologies is highly energy-intensive and chemical consuming.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Engineering, Chemical
Hilario Flores-Mejia, Antonio Lara-Musule, Eliseo Hernandez-Martinez, Ricardo Aguilar-Lopez, Hector Puebla
Summary: This paper addresses the issue of efficient monitoring in anaerobic digestion processes, presenting two indirect monitoring approaches and discussing their performance using experimental data. Fractal analysis plays a key role in the data-driven approach, while observer techniques are shown to accurately predict key process variables.
Article
Thermodynamics
Ruoxuan Fan, Huan Xi
Summary: The study focuses on the Carnot Battery system, which is a promising energy storage technology. By constructing and analyzing four different system configurations, it is found that regenerative systems with higher thermal storage temperature exhibit better thermo-economic performance.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Lixing Zheng, Yangdi Hu, Changning Mi, Jianqiang Deng
Summary: This study investigates the exergetic performance of a CO2 two-phase ejector and explores the interactions among its components. The results show that the mixing chamber is the component with the largest exergy destruction, followed by the motive nozzle, diffuser, and suction chamber. The optimization potential of the components in terms of exergy destruction is ranked as follows: motive nozzle, diffuser, mixing chamber, and suction chamber. Reducing the suction flow temperature and ejector area ratio can decrease the avoidable exergy destruction. The study provides valuable insights for optimizing the efficiency of ejectors.
APPLIED THERMAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Lina Wang, Chunyu Zhou, Hamid Reza Rahbari, Luca Cioccolanti
Summary: The organic Rankine cycle (ORC) powered by solar energy is the most energy-efficient technology for seawater desalination in the small- to medium-electricity ranges. This study investigates the performance and economic parameters of a parabolic trough collector (PTC)-powered ORC, using Dowtherm A and toluene as working fluids. The results show that the ORC system has an exergy efficiency of 30.39% and a total hourly cost of 39.38 US$/h.
Article
Engineering, Environmental
Jianzhao Zhou, Jingzheng Ren, Chang He
Summary: This study proposes a novel carbon-neutral valorization approach for medical waste in Hong Kong, integrating a rich-O2 steam gasification-based process with carbon capture, utilization, and storage (CCUS). The process captures CO2 from the syngas and utilizes it for the production of high value-added products. Multiple steam Rankine cycles are employed to convert waste heat to power, achieving high energy efficiency. The study highlights the importance of advanced exergy analysis, optimization, and renewable wind energy for sustainability and economic viability.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
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.