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Mixture temperature prediction of waxy oil–water two-phase system flowing near wax appearance temperature

Chinese Journal of Chemical Engineering 2016年第6期24卷 795-802页

作者： Ali Piroozian Muhammad A. Manan Issham Ismail Rahmat Mohsin Ali Esfandyari Bayat Mac DarlingtonUche Onuoha mahmoud hemmati Department of Petroleum Engineering Faculty of Petroleum and Renewable Energy Engineering Universiti Teknologi Malaysia Johor 81310 Malaysia Malaysia Petroleum Resources Corporation (UTM-MPRC) Institute for Oil and Gas Universiti Teknologi MalaysiaJohor 81310 Malaysia ffshore Oil and Gas Research Center College of Mechanical and Oil/Gas Transportation Engineering China University of Petroleum Beijing 102249 China

Temperature sensitivity of waxy crude oils makes it difficult to study their flow behaviour in the presence of water especially near their wax appearance temperature （WAT）. In this study a method was proposed and implemented to mitigate such difficulties which was applied in predicting mixture temperatures （Tin） of a typical Malaysian waxy crude oil and water flow in a horizontal pipe. To this end, two analytical models were derived firstly from calorimetry equation which based on developed two correlations for defining crude oil heat capacity actualized from the existed specific heat capacities of crude oils. The models were then applied for a set of experiments to reach the defined three predetermined Tm （26 ℃, 28 ℃ and 30 ℃）. The comparison between the predicted mixture temperatures （Tin,1 and Tin,2） from the two models and the experimental results displayed acceptable absolute average errors （0.80% 0.62%, 0.53% for model 1; 0,74%, 0.54%, 0.52% for model 2）. Moreover, the average errors for both models are in the range of standard error limits （4-0,75Z） according to ASTM E230. Conclusively, the proposed model showed the ease of obtaining mixture temperatures close to WAT as predetermined with accuracy of ± 0.5 ℃approximately for over 84% of the examined cases. The method is seen as a practical reference point to further study the flow behaviour of waxy crudes in oil-water two-phase flow system near sensitive temperatures.

关键词： Mixture temperature predictionAnalytical modelWaxy oil-water two-phase flowWax appearance temperature

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Stochastic Linear Programming for Optimal Planning of Battery Storage Systems Under Unbalanced-uncertain Conditions

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Journal of Modern Power Systems and Clean Energy 2020年第5期8卷 971-980页

作者： Reza hemmati Hasan Mehrjerdi Department of Electrical Engineering Kermanshah University of TechnologyKermanshahIran Qatar University DohaQatar

Battery energy storage system(BESS)has already been studied to deal with uncertain parameters of the electrical systems such as loads and renewable ***,the BESS have not been properly studied under unbalanced operation of power *** paper aims to study the modelling and operation of BESS under unbalanced-uncertain conditions in the power *** proposed model manages the BESS to optimize energy cost,deal with load uncertainties,and settle the unbalanced loading at the same *** three-phase unbalanced-uncertain loads are modelled and the BESSs are utilized to produce separate charging/discharging pattern on each phase to remove the unbalanced *** IEEE 69-bus grid is considered as case *** load uncertainty is developed by Gaussian probability function and the stochastic programming is adopted to tackle the *** model is formulated as mixed-integer linear programming and solved by GAMS/*** results demonstrate that the model is able to deal with the unbalanced-uncertain conditions at the same *** model also minimizes the operation cost and satisfies all security constraints of power grid.

关键词： Battery energy storage system(BESS) singlephase storage planning unbalanced loading uncertainty

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Mass transfer investigation and operational sensitivity analysis of aminebased industrial CO_2 capture plant

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Chinese Journal of Chemical Engineering 2019年第3期27卷 534-543页

作者： Abbas hemmati Hamed Rashidi Chemical Engineering Department Faculty of Energy Kermanshah University of Technology

In this article, the industrial process of CO_2 capture using monoethanolamine as an aqueous solvent was probed carefully from the mass transfer viewpoint. The simulation of this process was done using Rate-Base model, based on two-film theory. The results were validated against real plant data. Compared to the operational unit, the error of calculating absorption percentage and CO_2 loading was estimated around 2%. The liquid temperature profiles calculated by the model agree well with the real temperature along the absorption tower, emphasizing the accuracy of this model. Operational sensitivity analysis of absorption tower was also done with the aim of determining sensitive parameters for the optimized design of absorption tower and optimized operational conditions. Hence,the sensitivity analysis was done for the flow rate of gas, the flow rate of solvent, flue gas temperature, inlet solvent temperature, CO_2 concentration in the flue gas, loading of inlet solvent, and MEA concentration in the solvent. CO_2 absorption percentage, the profile of loading, liquid temperature profile and finally profile of CO_2 mole fraction in gas phase along the absorption tower were studied. To elaborate mass transfer phenomena, enhancement factor, interfacial area, molar flux and liquid hold up were probed. The results show that regarding the CO_2 absorption, the most important parameter was the gas flow rate. Comparing liquid temperature profiles showed that the most important parameter affecting the temperature of the rich solvent was MEA concentration.

关键词： Carbon dioxide Monoethanolamine Rate-base model Enhancement factor Sensitivity analysis

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Resilence Control of DC Microgrid Integrated with Multi-Nanogrids Considering Connected-Islanded States

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 786-796页

作者： Hossien Faraji Reza hemmati Pierluigi Siano Department of Electrical Engineering Amirkabir University of TechnologyTehranIran Department of Electrical Engineering Kermanshah University of TechnologyKermanshahIran Department of Management&Innovation Systems University of Salernoand also with the Department of Electrical and Electronic Engineering ScienceUniversity of JohannesburgJohannesburg 2006South Africa

In this paper, a DC microgrid (DCMG) integrated with a set of nano-grids (NG) is studied. DCMG exchanges predetermined active and reactive power with the upstream network. DCMG and NGs are coordinately controlled and managed in such a way the exchanged P-Q power with external grid are kept on scheduled level following all events and operating conditions. The proposed control system, in addition to the ability of mutual support between DCMG and NGs, makes NGs support each other in critical situations. On the other hand, in all operating conditions, DCMG not only feeds three-phase loads with time-varying active and reactive power on the grid side but also injects constant active power into the grid. During events, NGs support each other, NGs support DCMG, and DCMG supports NGs. Such control strategies are realized by the proposed control method to increase resilience of the system. For these purposes, all resources and loads in DCMG and NGs are equipped with individual controllers. Then, a central control unit analyzes, monitors, and regularizes performance of individual controllers in DCMG and NGs. Nonlinear simulations show the proposed model can effectively control DCMG and NGs under normal and critical conditions.

关键词： Control system DC microgrid nanogrid resilience

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Assessing renewable-energy potential and feasibility in Tehran’s buildings

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Clean Energy 2022年第6期6卷 944-958页

作者： Mehrab hemmati Farahani Marjan Namazzadeh Azin hemmati Farahani Faculty of Engineering Islamic Azad UniversityArak BranchIran Faculty of Geography and Urban planning University of Yadgar Emam Shahr Rey Islamic Azad University TehranIran Faculty of Engineering University of Eyvanekey Iran

This article examines the results of using renewable energy to reduce the energy consumption of buildings *** particular,it looks at the results in a country such as Iran,which has a high potential for using solar energy.A comparison of the energy consumption of selected case samples based on the type of ownership of private,government and municipal buildings in 22 districts of Tehran has been *** data for energy consumption and Strengths,Weaknesses,Opportunities,Threats analysis includes open and usable spaces for installing renewable-energy systems in 10%of public buildings,4%of private facilities and 10%of municipal *** results of this study show that the average energy consumption of buildings in Tehran is almost four times the global *** has~300 days of sunlight for installing solar panels in any place where solar energy is in direct contact with the ***,it allows the building to use the energy absorbed by the discussions in all *** 2050,this country could play a decisive role in producing renewable *** addition,solar energy may reduce fossil-fuel consumption and production costs.

关键词： renewable energy 22 districts of Tehran environmental SWOT analysis building energy consumption

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Assessment of the methods for determining net radiation at different time-scales of meteorological variables

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第2期9卷 239-246页

作者： Ni An Sahar hemmati Yu-Jun Cui Ecole des Ponts ParisTech Laboratoire Navier/CERMES6e8 av. Blaise PascalCité DescartesChamps sur Marne77455 Marne la ValléeFrance Université Paris-Est IFSTTARGERS14e20 Boulevard NewtonCité DescartesChamps sur Marne77447 Marne la ValléeFrance

When modeling the soil/atmosphere interaction,it is of paramount importance to determine the net radiation *** are two common calculation methods for this *** 1 relies on use of air temperature,while Method 2 relies on use of both air and soil ***,there has been no consensus on the application of these two *** this study,the half-hourly data of solar radiation recorded at an experimental embankment are used to calculate the net radiation and long-wave radiation at different time-scales(half-hourly,hourly,and daily) using the two *** results show that,compared with Method 2 which has been widely adopted in agronomical,geotechnical and geo-environmental *** 1 is more feasible for its simplicity and accuracy at shorter ***,in case of longer time-scale,daily for instance,less variations of net radiation and long-wave radiation are obtained,suggesting that no detailed soil temperature variations can be *** other words,shorter time-scales are preferred in determining net radiation flux.

关键词： Energy balance Net radiation Different time-scales Meteorological data

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6G-Enabled Internet of Things:Vision,Techniques,and Open Issues

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Computer Modeling in Engineering & Sciences 2022年第12期133卷 509-556页

作者： Mehdi Hosseinzadeh Atefeh hemmati Amir Masoud Rahmani Pattern Recognition and Machine Learning Lab Gachon UniversitySeongnam13120Korea Department of Computer Engineering Science and Research BranchIslamic Azad UniversityTehran***Iran Future Technology Research Center National Yunlin University of Science and TechnologyYunlin64002Taiwan

There are changes in the development of wireless technology systems every decade.6G(sixth generation)wireless networks improve on previous generations by increasing dependability,accelerating networks,increasing available bandwidth,decreasing latency,and increasing data transmission speed to standardize communication *** purpose of this article is to comprehend the current directions in 6G studies and their relationship to the Internet of Things(IoT).Also,this paper discusses the impacts of 6G on IoT,critical requirements and trends for 6G-enabled IoT,new service classes of 6G and IoT technologies,and current 6G-enabled IoT studies selected by the systematic literature review(SLR)method published from 2018 to *** addition,we present a technical taxonomy for the classification of 6G-enabled IoT,which includes self-organization systems,energy efficiency,channel assessment,and ***,according to the articles reviewed,we consider the evaluation factors in this domain,including data transmission,delay,energy consumption,and ***,we focus on open issues and future research challenges in 6G-enabled *** mention important future challenges and directions,we can point to migration,data storage,data resource,data security,data sharing,data offloading,availability,scalability,portability,user experience,reliability,authentication,and authorization.

关键词： Internet of Things 6G wireless network machine learning artificial intelligence

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A multi-functional dynamic state estimator for error validation:measurement and parameter errors and sudden load changes

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Frontiers of Information Technology & Electronic Engineering 2016年第11期17卷 1218-1227页

作者： Mehdi AHMADI JIRDEHI Reza hemmati Vahid ABBASI Hedayat SABOORI Department of Electrical Engineering Kermanshah University of Technology

We propose a new and efficient algorithm to detect, identify, and correct measurement errors and branch parameter errors of power systems. A dynamic state estimation algorithm is used based on the Kalman filter theory. The proposed algorithm also successfully detects and identifies sudden load changes in power systems. The method uses three normalized vectors to process errors at each sampling time: normalized measurement residual, normalized Lagrange multiplier, and normalized innovation vector. An IEEE 14-bus test system was used to verify and demonstrate the effectiveness of the proposed method. Numerical results are presented and discussed to show the accuracy of the method.

关键词： Dynamic state estimation Kalman filter Measurement errors Branch parameter errors Sudden load changes

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Classification and assessment of rock mass parameters in Choghart iron mine using P-wave velocity

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第2期9卷 318-328页

作者： Mohammadreza hemmati Nourani Mohsen Taheri Moghadder Mohsen Safari Department of Mining and Metallurgy Yazd UniversityYazdIran Department of Mining Engineering Shahid Bahonar University of KermanKermanIran Department of Mining Engineering Birjand University of TechnologyBirjandIran

Engineering rock mass classification,based on empirical relations between rock mass parameters and engineering applications,is commonly used in rock engineering and forms the basis for designing rock *** basic data required may be obtained from visual observation and laboratory or field ***,owing to the discontinuous and variable nature of rock masses,it is difficult for rock engineers to directly obtain the specific design parameters *** an alternative,the use of geophysical methods in geomechanics such as seismography may largely address this *** this study,25 seismic profiles with the total length of 543 m have been scanned to determine the geomechanical properties of the rock mass in blocks Ⅰ,Ⅲ and Ⅳ-2 of the Choghart iron ***,rock joint measurements and sampling for laboratory tests were *** results show that the rock mass rating（RMR） and Q values have a close relation with P-wave velocity parameters,including P-wave velocity in field(V;).P-wave velocity in the laboratory(V;) and the ratio of V;V;(i.e.K;= V;/V;.However,Q value,totally,has greater correlation coefficient and less error than the RMR,In addition,rock mass parameters including rock quality designation（RQD）,uniaxial compressive strength（UCS）,joint roughness coefficient（JRC） and Schmidt number（RN） show close relationship with P-wave *** equation based on these parameters was obtained to estimate the P-wave velocity in the rock mass with a correlation coefficient of 91%.The velocities in two orthogonal directions and the results of joint study show that the wave velocity anisotropy in rock mass may be used as an efficient tool to assess the strong and weak directions in rock mass.

关键词： Rock mass classification P-wave velocity Q system Rock mass rating(RMR) Geophysical methods

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Introducing a Novel Approach for Oil-Oil Correlation based on Asphaltene Structure: X-ray Diffraction

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Acta Geologica Sinica(English Edition) 2021年第6期95卷 2100-2119页

作者： Zahra SADEGHTABAGHI Ahmad Reza RABBANI Abdolhossein hemmati-SARAPARDEH Department of Petroleum Engineering Amirkabir University of TechnologyTehranIran Department of Petroleum Engineering Shahid Bahonar University of KermanKermanIran Institute of Research and Development Duy Tan UniversityDa Nang 550000Vietnam Faculty of Environmental and Chemical Engineering Duy Tan UniversityDa Nang 550000Vietnam

Asphaltenes have always been an attractive subject for ***,the application of this fraction of the geochemical field has only been studied in a limited *** other words,despite many studies on asphaltene structure,the application of asphaltene structures in organic geochemistry has not so far been ***-oil correlation is a wellknown concept in geochemical studies and plays a vital role in basin modeling and the reconstruction of the burial history of basin sediments,as well as accurate characterization of the relevant petroleum *** study aims to propose the Xray diffraction(XRD)technique as a novel method for oil-oil correlation and investigate its reliability and accuracy for different crude *** this end,13 crude oil samples from the Iranian sector of the Persian Gulf region,which had previously been correlated by traditional geochemical tools such as biomarker ratios and isotope values,in four distinct genetic groups,were selected and their asphaltene fractions analyzed by two prevalent methods of XRD and Fouriertransform infrared spectroscopy(FTIR).For oil-oil correlation assessment,various cross-plots,as well as principal component analysis(PCA),were conducted,based on the structural parameters of the studied *** results indicate that asphaltene structural parameters can also be used for oil-oil correlation purposes,their results being completely in accord with the previous *** average values of distance between saturated portions(d_(r))and the distance between two aromatic layers(d_(m))of asphaltene molecules belonging to the studied oil samples are 4.69Aand 3.54A,***,the average diameter of the aromatic sheets(L_(a)),the height of the clusters(L_(c)),the number of carbons per aromatic unit(C_(au)),the number of aromatic rings per layer(R_(a)),the number of sheets in the cluster(M_(e))and aromaticity(f_(a))values of these asphaltene samples are 10.09A,34.04A,17.42A,3.78A,10.6

关键词： oil-oil correlation petroleum characterization X-ray diffraction Fourier-transform infrared spectroscopy decision tree classification

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