Article
Energy & Fuels
Siti Norhafiza Mohd Khazaai, Prakash Bhuyar, Mohd Hasbi Ab Rahim, Muhammad Hasnol Fazirin Mohd Alwi, Sih Yiting, Gaanty Pragas Maniam
Summary: This study aimed to observe an appropriate blending proportion of palm, olive, and soybean-based biodiesel based on refractive index, density, and kinematic viscosity analysis. The results showed accurate values for refractive index and density in blend fractions of B7 to B100, with a strong linear relationship between the variables.
BIOMASS CONVERSION AND BIOREFINERY
(2021)
Article
Chemistry, Physical
Jami Paparao, S. Murugan
Summary: This research investigates the engine behavior of a compression ignition engine operated in dual-fuel mode with HHO as the primary fuel. The results show that using HHO can improve the engine's thermal efficiency and diesel combustion efficiency at maximum load, while reducing exhaust gas temperature and emissions of pollutants.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Jong Boon Ooi, Chia Chuin Kau, Dilrukshan Naveen Manoharan, Xin Wang, Manh-Vu Tran, Yew Mun Hung
Summary: Adding multi-walled carbon nanotubes improves the thermal conductivity of 20 vol% palm oil biodiesel in fossil diesel (B20). Experimental results from a single-cylinder diesel engine show that the addition of MWCNTs reduces ignition delay, improves combustion efficiency and performance, and reduces CO and UHC emissions while increasing NOx emissions.
Article
Chemistry, Multidisciplinary
Jarernporn Thawornprasert, Wiriya Duangsuwan, Krit Somnuk
Summary: The optimum conditions for producing refined crude palm oil methyl ester were investigated using the response surface method. Vacuum distillation was conducted to obtain refined crude palm oil with reduced free fatty acids, improving nutritional benefits and reducing chemical consumption. The purity of the methyl ester was studied by adjusting variables such as methanol content, potassium hydroxide concentration, stirrer speed, and reaction time. The results showed that the methyl ester had a purity of 96.91 wt% under the optimal conditions.
Article
Energy & Fuels
Pritam Dey, Srimanta Ray, Abhishek Newar
Summary: A statistically optimized blend fuel was developed to replace diesel, with density and calorific value comparable to standard diesel. Experimental results showed that the blend fuel has cleaner emissions and can reduce engine operating costs by 43-46% relative to diesel.
Article
Engineering, Chemical
Yanhui Zhang, Yunhao Zhong, Jie Wang, Dongli Tan, Zhiqing Zhang, Dayong Yang
Summary: This study investigated the combustion and emission characteristics of a four-stroke diesel engine fueled with biodiesel. The results showed that biodiesel can improve the performance of the diesel engine.
Article
Agricultural Engineering
Hei Xiao, Wenchao Wang, Haochen Bao, Fashe Li, Li Zhou
Summary: This study investigated the kinematic viscosity, calorific value, and flash point of three biodiesel-diesel blends. Novel prediction equations for the calorific value were established based on the kinematic viscosity and flash point. Lederer's equation, theoretical calorific values, and the Hu-Burns equation were effective for predicting the properties of the biodiesel-diesel blends. A prediction model was established using these equations. The study has important implications for the efficient utilization of biodiesel-diesel blended fuel.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Green & Sustainable Science & Technology
Nurul Hanim Razak, Haslenda Hashim, Nor Alafiza Yunus, Jiri Jaromir Klemes
Summary: The study demonstrates that a blend of 70% diesel, 20% biodiesel, and 10% butanol is the optimal choice, providing similar performance to diesel with reduced NOx emissions of 7% to 15% at a lower cost.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Sibel Osman, Amalia Stefaniu
Summary: This paper reports the properties of blends of diesel fuel with n-butanol, n-pentanol, and diethylene glycol dimethyl ether, and verifies different mathematical models for better quality standards. Additionally, correlations between density and distillation temperatures are investigated to estimate the cetane indices of fuel blends, which is useful in designing transport equipment or pipelines in the automobile industry.
Article
Thermodynamics
S. H. Pourhoseini, M. Namvar-Mahboub, Ebrahim Hosseini, Ashkan Alimoradi
Summary: The study compared the effects of diesel fuel and palm oil biodiesel-diesel blend fuel on the flame characteristics of an oil burner. Results showed that the blend fuel produced a voluminous flame with lower temperature but higher concentration of soot particles compared to diesel fuel. The use of blend fuel also increased IR emissions and flame luminosity while decreasing NOx emissions significantly.
Article
Thermodynamics
S. Jaikumar, V Srinivas, M. Rajasekhar
Summary: This study aims to improve the performance of a direct injection compression-ignition engine using nanoparticle dispersed Flaxseed oil biodiesel blend (B20). The addition of Chromium oxide (Cr2O3) nanoparticle additive has shown to enhance combustion characteristics, brake thermal efficiency, and reduce emissions.
Article
Chemistry, Multidisciplinary
Chandrabhushan Tiwari, Tikendra Nath Verma, Gaurav Dwivedi, Puneet Verma
Summary: Renewable energy is gaining more attention due to the depletion of fossil fuel reserves. In this study, Spirulina microalgae were used as feedstock for biodiesel production. Energy and exergy analysis were conducted on a diesel engine using different fuel blends. The results showed that the exergy efficiency of pure diesel was higher than that of biodiesel blends. The study also found that the engine's sustainability index was associated with exergy efficiencies.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Chemical
Milind H. Joshipura, Parag Saxena, Nimish Shah, Ankur Dwivedi, Shibu Pillai, Madhu Aggrawal
Summary: In this study, jatropha, palm, and karanja-based biodiesel and diesel blends, as well as biodiesel diesel and butanol blends, were investigated. Density and viscosity data were generated for these blends at different temperatures. The addition of butanol did not significantly affect the density or viscosity of the blends. Empirical models were fitted to the data, and a new empirical model for viscosity performed well compared to other models.
INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Salah Yahya, Babak Aghel
Summary: This study compares the accuracy of different empirical and intelligent paradigms for estimating biodiesel-diesel blends, and determines that the LSSVM with a polynomial kernel is the most accurate approach. The designed model estimated the kinematic viscosity of 636 biodiesel-diesel blends with high accuracy.
Article
Energy & Fuels
Olusegun David Samuel, M. Adekojo Waheed, A. Taheri-Garavand, Tikendra Nath Verma, Olawale U. Dairo, Bukola O. Bolaji, Asif Afzal
Summary: Unconventional biodiesel characterization techniques are increasingly being used to study the combustion and bioenergy characteristics of biodiesel. In this study, Response Surface Methodology (RSM) and Artificial Neural Network (ANN) techniques were used to model the optimum production yield of Food Industrial Waste Oil Methyl Ester. The results showed that ANN outperformed RSM in predicting biodiesel production yield, and the performance indicators of different fuel types demonstrated the advantages of biodiesel in fuel blends.
Article
Thermodynamics
Murat Hosoz, Mehrnet Direk, Kadri S. Yigit, Mustafa Canakci, Ali Turkcan, Ertan Alptekin, Ali Sanli
APPLIED THERMAL ENGINEERING
(2015)
Article
Energy & Fuels
Ertan Alptekin, Mustafa Canakci, Ahmet Necati Ozsezen, Ali Turkcan, Huseyin Sanli
Article
Energy & Fuels
H. Sanli, M. Canakci, E. Alptekin, A. Turkcan, A. N. Ozsezen
Article
Thermodynamics
Ertan Alptekin
Article
Energy & Fuels
Ertan Alptekin
Article
Environmental Sciences
Huseyin Sanli, Ertan Alptekin, Mustafa Canakci
WASTE AND BIOMASS VALORIZATION
(2019)
Article
Energy & Fuels
Huseyin Sanli, Mustafa Canakci, Ertan Alptekin
Article
Green & Sustainable Science & Technology
Mustafa Canakci, Ahmet Necati Ozsezen, Ertan Alptekin, Muharrem Eyidogan
Article
Engineering, Environmental
Ertan Alptekin, Mustafa Canakci, Huseyin Sanli
Article
Thermodynamics
Ertan Alptekin, Huseyin Sanli, Mustafa Canakci
APPLIED THERMAL ENGINEERING
(2019)
Article
Energy & Fuels
Huseyin Sanli, Ertan Alptekin, Mustafa Canakci
Summary: The experimental study found that using ternary micro-emulsification fuels resulted in an increase in brake specific fuel consumption and a decrease in thermal efficiency, although the effects were slightly better than petrodiesel at high engine loads. Additionally, ternary fuels had earlier injection timings, higher injection amount and rates compared to petrodiesel.
Article
Energy & Fuels
Usame Demir, Gokhan Coskun, Hakan S. Soyhan, Ali Turkcan, Ertan Alptekin, Mustafa Canakci
Summary: This study experimentally and numerically analyzed the effects of using conventional camshafts and electromechanical valve mechanisms (EMV) in a single-cylinder spark-ignition engine. Results showed that the use of EMV system significantly influences volumetric efficiency and parameters such as in-cylinder air flow.
Article
Engineering, Mechanical
Erkutay Tasdemirci, Ertan Alptekin, Murat Hosoz
Summary: This study evaluates the comparative energetic and exergetic performance of a laboratory MAC system using R1234yf and R134a refrigerants. The results show that the system with R1234yf provides less cooling duty and coefficient of performance, and destructs more exergy per unit cooling duty compared to the system with R134a.
INTERNATIONAL JOURNAL OF VEHICLE DESIGN
(2022)
Article
Thermodynamics
Erkutay Tasdemirci, Ertan Alptekin, Murat Hosoz
INTERNATIONAL JOURNAL OF EXERGY
(2020)
Article
Thermodynamics
Ertan Alptekin, Mustafa Canakci
APPLIED THERMAL ENGINEERING
(2017)
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.
