Loading...
Search for:
fueling
0.012 seconds
Total 779 records
A novel system for electricity and synthetic natural gas production from captured CO2: Techno-economic evaluation and multi-objective optimization
, Article Journal of CO2 Utilization ; Volume 63 , 2022 ; 22129820 (ISSN) ; Jalili, M ; Ziyaei, M ; Chitsaz, A ; Rosen, M. A ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
To mitigate global warming and fossil fuel shortages a novel oxy-fuel combustion power plant integrated with a power to gas system is proposed. A net-zero emission MATIANT cycle with inherent CO2 capture ability is selected as the power cycle also providing the CO2 and power demand of the power to gas system, which comprises a proton exchange membrane electrolyzer for hydrogen production and a Sabatier reactor for methanation. A techno-economic investigation, a multi-objective optimization, and a sensitivity analysis are carried out. A comprehensive economic method that covers all economic aspects is utilized, and a Sabatier reactor model which considers the possibility of the presence of...
Predicting the environmental economic dispatch problem for reducing waste nonrenewable materials via an innovative constraint multi-objective Chimp Optimization Algorithm
, Article Journal of Cleaner Production ; Volume 365 , 2022 ; 09596526 (ISSN) ; Ren, H ; Habibi, M ; Mohammed, K. J ; Khadimallah, M. A ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
The usage of conventional fossil fuels has aided fast economic growth while also having negative consequences, such as increased global warming and the destruction of the ecosystem. This paper proposes a novel swarm-based metaheuristic method called Chimp Optimization Algorithm (ChOA) to tackle the environmental, economic dispatch issue and reducing the waste nonrenewable materials. In this regard, two objective functions named fuel cost function and emission cost function are proposed. Unique constrained handling also solves the challenge of multi-objective optimization. Standard IEEE 30 bus with six generators and a 10-unit system are used to demonstrate the usefulness of ChOA. The result...
Flooding and dehydration diagnosis in a polymer electrolyte membrane fuel cell stack using an experimental adaptive neuro-fuzzy inference system
, Article International Journal of Hydrogen Energy ; Volume 47, Issue 81 , 2022 , Pages 34628-34639 ; 03603199 (ISSN) ; Alasty, A ; Kermani, M. J ; Asghari, S ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Today the need for fault diagnosis in polymer electrolyte membrane fuel cells (PEMFCs) is felt more than ever to increase the useful life and durability of the cell. The present study proposes an indirect in-situ experimental-based algorithm for diagnosing the moisture content issues in a three-cell stack. Three adaptive neuro-fuzzy inference systems (ANFIS) approximate the system outputs (cells voltages, cathodic and anodic pressure drop) in normal conditions. The values of Pearson's correlation coefficients (0.998, 0.983, and 0.995 for outputs, respectively) show the high quality of the modeling. In unknown operating conditions, the residuals of experimental and ANFIS values are compared...
Trimetallic Co-Ni-Mn metal-organic framework as an efficient electrocatalyst for alkaline oxygen evolution reaction
, Article Journal of Electroanalytical Chemistry ; Volume 922 , 2022 ; 15726657 (ISSN) ; Hatami, H ; Mirzaee Valadi, F ; Sharif University of Technology
Elsevier B.V
2022
Abstract
Designing efficient and inexpensive catalysts toward the oxygen evolution reaction (OER) is vital for achieving sustainable and green hydrogen fuel production through water electrolysis. Herein, we have synthesized several bi- and trimetallic metal–organic frameworks (MOFs) composed of Co, Ni, and Mn metals and benzene-1,3,5-tricarboxylic acid linker. The MOFs were prepared via a simple hydrothermal method, and their electrocatalytic performances in alkaline OER were investigated. A battery of analytical techniques was employed to characterize the as-synthesized materials, including field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM),...
Enhanced ORR catalytic activity of rare earth-doped Gd oxide ions in a CoFe2O4 cathode for low-temperature solid oxide fuel cells (LT-SOFCs)
, Article Ceramics International ; Volume 48, Issue 19 , 2022 , Pages 28142-28153 ; 02728842 (ISSN) ; Akbar, M ; Yousaf Shah, M. A. K ; Noor, A ; Lu, Y ; Akhtar, M. N ; Mushtaq, N ; Hu, E ; Yan, S ; Zhu, B ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
The search for cathode materials with fast oxygen reduction reaction (ORR) catalytic activities and high ionic conductivity is the key obstacle to SOFCs commercialization and its operation at low temperatures. In order to search for a cathode with enhanced catalytic functionality, herein we report a single-phase CoFe2O4 (CFO) and CoGd0.2Fe1.80O4 (CGFO), which can be employed as an active cathode to improve electrocatalytic ORR functionalities at low temperature. It is found that CGFO having enriched oxygen vacancies exhibits the least polarization resistance (RP) of 0.42 Ωcm2 compared to the pure CFO which shows polarization resistance of 0.56 Ω cm2 under H2/air conditions. Furthermore,...
IoT-based intelligent source–load–storage coordination scheme for prosumer campus microgrids
, Article Frontiers in Energy Research ; Volume 10 , 2022 ; 2296598X (ISSN) ; Shahzad, M ; Shehzad, M ; Akhter, J ; Almohaimeed, Z. M ; Akram, R ; Hussain, M. M ; Sharif University of Technology
Frontiers Media S.A
2022
Abstract
Electrical energy is very necessary for human life in the modern era. The rising energy prices, depletion of fossil fuels, and instability of the grid are alarming situations. So, it needs a smart solution to ensure the balance between pricing and saving natural resources. Some other issues like environmental change, limitations on installation of new transmission lines, reliability concerns, and considering the expansion in distributed energy generation technologies promise the implementation of distributed generation extensively. The integration of two or more energy supplies in a power system is known as distributed energy resource system. In this study, a university campus is taken as a...
Development and verification of a flexible tethered satellite system model considering the fuel slosh
, Article Multibody System Dynamics ; Volume 56, Issue 3 , 2022 , Pages 289-312 ; 13845640 (ISSN) ; Vatankhah, R ; Eghtesad, M ; Assadian, N ; Sharif University of Technology
Springer Science and Business Media B.V
2022
Abstract
Removing space debris of various sizes, configurations, and properties from Earth’s orbits is one of the main missions of world space agencies. The existence of deactivated bodies within the path of other spacecraft increases the risk of collision. Althgough towing a satellite through a tether and taking it out of orbit may be a definite solution for space debris removal, most deactivated satellites have some fuel remaining in their fuel tank. This remaining liquid slosh within the tank directly affects satellite motion. To improve the mathematical modeling, the existence of unburned fuel is considered. More specifically, this research focuses on dynamic modeling and control of a selected...
The effect of acid treatment and calcination on the modification of zeolite X in diesel fuel hydrodesulphurization
, Article Canadian Journal of Chemical Engineering ; Volume 100, Issue 11 , 2022 , Pages 3357-3366 ; 00084034 (ISSN) ; Kazemeini, M ; Soltanali, S ; Rashidzadeh, M ; Sharif University of Technology
John Wiley and Sons Inc
2022
Abstract
Faujasite (X, Y) zeolites are considered the main and important catalysts in hydrorefining processes. In order to obtain zeolites with higher acidity and volume of mesopores, post-synthesis modification, dealumination by different pickling techniques (using ethylenediamine tetraacetic acid [EDTA] chelating agent), and thermal treatment (calcination) were employed. The dealumination process led to the removal of the aluminum atoms from the zeolite structure and a rise in acidity while maintaining the zeolite crystalline lattice. X-ray diffraction (XRD), atomic absorption spectrometry (AAS), Fourier-transform infrared (FT-IR), field-emission scanning electron microscopy (FE-SEM),...
Imposed magnetic field impact on vortex generation in the laminar nanofluid flow: A computational approach
, Article International Communications in Heat and Mass Transfer ; Volume 139 , 2022 ; 07351933 (ISSN) ; Prakash, M ; Jamshed, W ; Ibrahim, R. W ; Ahmad, S ; Raizah, Z ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Metal manufacturing plants, nuclear power plants (which produce steam, by using thermal energy yielded during the nuclear fission, for spinning enormous turbines to generate electricity), and geothermal power plants are a few in the extensive list of technologies where different processes occur in high temperature environment in the presence of strong magnetic fields. Nanofluids (NFs), on the other hand, have been successful in achieving wide acceptance as the next generation coolant in the above mentioned industries as well as in the automobiles, heat exchangers, and steam boilers, owing to their remarkable thermal performance. These observations motivate the authors to explore the change...
Projection of passenger cars’ air pollutants and greenhouse gas emissions and fuel consumption in Tehran under alternative policy scenarios
, Article Case Studies on Transport Policy ; Volume 10, Issue 4 , 2022 , Pages 2195-2207 ; 2213624X (ISSN) ; Maleki, A ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Passenger cars (PCs) are a major contributor to urban air pollution, greenhouse gas emissions, and energy security challenges in megacities in developing countries because of their high growth potential. Since the PC fleet changes through time, the projection of air pollutant emissions from PCs is essential for effective emission reduction policymaking. However, the extensive amount of data and proper models are required for this purpose that are not available in many developing countries. Hence, this study develops multiple econometric and emission models and integrate them into a framework to simulate the future stock and activity of PCs and projects PCs’ air pollutants and CO2 emissions...
Applications of soft computing in nuclear power plants: A review
, Article Progress in Nuclear Energy ; Volume 149 , 2022 ; 01491970 (ISSN) ; Moshkbar Bakhshayesh, K ; Vosoughi, N ; Ghofrani, M. B ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Soft Computing (SC) is defined as a group of computational techniques that solve complex problems independent of mathematical models. SC techniques including artificial neural networks (ANNs), fuzzy systems (FSs), evolutionary algorithms (EAs), etc., can solve problems that either cannot be solved by the analytical/conventional methods or require a long computation time. Due to their features, SC techniques are nowadays widely used in scientific and industrial researches. SC techniques have also been included in many types of research related to nuclear power plants (NPPs). In this paper, the applications of SC techniques in NPPs, according to published articles, are presented. The...
Scheduling and sizing of campus microgrid considering demand response and economic analysis
, Article Sensors ; Volume 22, Issue 16 , 2022 ; 14248220 (ISSN) ; Shahzad, M ; Javed, H ; Muqeet, H. A ; Akhter, M. N ; Liaqat, R ; Hussain, M. M ; Sharif University of Technology
MDPI
2022
Abstract
Current energy systems face multiple problems related to inflation in energy prices, reduction of fossil fuels, and greenhouse gas emissions which are disturbing the comfort zone of energy consumers and the affordability of power for large commercial customers. These kinds of problems can be alleviated with the help of optimal planning of demand response policies and with distributed generators in the distribution system. The objective of this article is to give a strategic proposition of an energy management system for a campus microgrid (µG) to minimize the operating costs and to increase the self-consuming energy of the green distributed generators (DGs). To this end, a real-time based...
Development of subchannel thermal-hydraulic analysis code for dual cooled annular fuel
, Article Progress in Nuclear Energy ; Volume 150 , 2022 ; 01491970 (ISSN) ; Esmaili, H ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Regarding the geometric structural characteristics of innovative dual cooled annular fuel and the possibility of heat split and flow distribution among the internal and external channels, the development of new computational tools is essential for estimating safety margins and accurate assessment of its thermal-hydraulic performance. The SADAF code (Subchannel Analysis Dual cooled Annular Fuel) by COBRA-EN code is developed for this purpose. In the SADAF code, using COBRA-EN code for subchannel analysis in internal and external subchannels, a program has been developed to compute new variables that need to be considered in the thermal-hydraulic assessment. Also, fuel heat transfer...
Assessing the contribution of different sources in atmospheric dispersion of PM2.5 and related health impact in a region of Qazvin, Iran
, Article Air Quality, Atmosphere and Health ; Volume 15, Issue 8 , 2022 , Pages 1379-1394 ; 18739318 (ISSN) ; Avami, A ; Mashayekhi, M ; Kianbakhsh, A ; Sharif University of Technology
Springer Science and Business Media B.V
2022
Abstract
Consumption of fossil fuels in residential, industrial, and transportation sectors has a significant contribution to air pollution and high attributable premature deaths. To target specific strategies for reducing health effects, the anthropogenic sources and their contributions should be identified. This article provides an integrated modeling approach to evaluate the sector-specific contributions of different PM2.5 sources on air pollution and relevant health impacts. The dispersion of emissions from different sources is modeled by the American Meteorological Society/Environmental Protection Agency Regulatory Model (AERMOD), and the health impacts are estimated by the Environmental...
Thermodynamic analysis and optimization of the organic Rankine and high-temperature Kalina cycles for recovering the waste heat of a bi-fuel engine
, Article Fuel ; Volume 322 , 2022 ; 00162361 (ISSN) ; Moosavi, A ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Global warming is currently one of the biggest concerns worldwide; hence, addressing this issue is a trending topic among the research community. Escalating global warming through the wasted energy (30% of its input chemical energy) from internal combustion engines (ICEs) by exhaust emission is a major issue that should be considered. One way to reduce the waste of energy from ICEs is to recover the heat using a thermodynamic cycle. Using this method, not only does the engine power increase but also the fuel consumption decreases. Toward this end, and in this study, the organic Rankine cycle (ORC) and high-temperature Kalina cycle (HTKC), which have been previously used for other purposes,...
Techno-economic assessment of a novel power-to-liquid system for synthesis of formic acid and ammonia, based on CO2 electroreduction and alkaline water electrolysis cells
, Article Renewable Energy ; Volume 187 , 2022 , Pages 1224-1240 ; 09601481 (ISSN) ; Khalili, M ; Pakzad, P ; Mehrpooya, M ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
The power-to-liquid concept is a promising strategy to convert the power plants' flue gas to value-added liquid fuels using renewable energy. This technology could potentially reduce global greenhouse gases emissions and mitigate the environmental problems associated with the fossil fuels industry. In this regard, the main objective of the present study is to propose a novel power-to-liquid plant for the synthesis of formic acid and ammonia from power plants' flue gas, emphasizing the role of electrochemical technologies and renewable energy. The system's basis is developed by the integration of CO2 electroreduction cell, alkaline water electrolysis cell, and photovoltaic panel technologies....
Satellite attitude PDE-based controller design considering fluid fuel sloshing in planar maneuver
, Article Aerospace Science and Technology ; Volume 122 , 2022 ; 12709638 (ISSN) ; Salarieh, H ; Nejat Pishkenari, H ; Sharif University of Technology
Elsevier Masson s.r.l
2022
Abstract
Due to significance of high-accuracy attitude control, the fuel sloshing effects on the satellite attitude should be considered, more precisely. This work deals with the attitude control of a liquid propellant-filled satellite considering the incompressible fuel sloshing in the planar maneuver. The satellite consists of a rigid body, a partially-filled tank and a flexible diaphragm. Hamilton's principle is employed to derive nonlinear coupled PDEs-ODEs governing the coupled satellite-diaphragm propellant tank system. Afterwards, to dispense with the spillover instability, a PDE-based controller is designed to realize the satellite attitude control while tracking a desired pitch angle and...
Prioritization of solar electricity and hydrogen co-production stations considering PV losses and different types of solar trackers: A TOPSIS approach
, Article Renewable Energy ; Volume 186 , 2022 , Pages 889-903 ; 09601481 (ISSN) ; Rezaei, M ; Mostafaeipour, A ; Goojani, A.R ; Saghaei, H ; Hosseini Dehshiri, S. J ; Hosseini Dehshiri, S. S ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Renewable hydrogen production plays a key role in transitioning to a hydrogen economy. For this, developing countries are encouraged to keep up with industrialized nations. As such, this study seeks to evaluate the potential of all capital cities of Iran in terms of solar-based hydrogen production and prioritize the nominated alternatives. This step is highly valued because finding the most suitable place for this purpose can lead to substantial outcomes and consequently avoid failure. Therefore, here a 20-kW solar power plant is simulated by PVsyst 6.7 software and meteorological data of 31 capital cities is extracted using Meteonorm 7.1 software. Considering all losses associated with...
Optimization of selenization process to remove Ga-induced pin-holes in CIGS thin films
, Article Solar Energy ; Volume 236 , 2022 , Pages 175-181 ; 0038092X (ISSN) ; Dehghani, M ; Tehrani, N. A ; Taghavinia, N ; Bagherzadeh, M ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
In thin-film solar cells, deposition of pinhole and the crack-free absorber layer, with the right chemical stoichiometry is highly important for high-performance solar cell devices. In solution-based CIGS solar cell technology, a nanoparticle ink approach provides phase stability of the final chalcogenide absorber layer. However, the sintering of small nanoparticles to form large grains with reduced grain boundaries is an important challenge in the fabrication process. This is usually realized by annealing in the Se atmosphere, i.e. selenization process. However, the presence of Ga in CIGS films leads to pinholes after selenization. In this study, the synthesis and deposition of high-quality...
Heat and mass transfer analysis and optimization of freeze desalination utilizing cold energy of LNG leaving a power generation cycle
, Article Desalination ; Volume 527 , 2022 ; 00119164 (ISSN) ; Eghtesad, A ; Afshin, H ; Sharif University of Technology
Elsevier B.V
2022
Abstract
Freeze desalination (FD) works upon the separation of impurities from pure water during ice crystals formation. The required cold source could be supplied by the cold energy of liquefied natural gas (LNG). In the current study, freeze desalination of seawater is explored by directly exploiting the cold energy of LNG within an appropriate range of temperature after producing work in a power generation cycle. A detailed discussion has been given on the inlet temperature of LNG to the FD unit for the first time. The direct utilization has the privilege of eliminating the addition of a secondary refrigerant and its refrigeration cycle to the FD process. A multi-objective optimization is...