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Thermo-economic analysis of a direct supercritical CO_(2) electric power generation system using geothermal heat

Frontiers in Energy 2022年第2期16卷 246-262页

作者： Xingchao WANG Chunjian PAN Carlos EROMERO Zongliang QIAO arindam banerjee Carlos RUBIO-MAYA Lehua PAN Department of Mechanical Engineering Colorado School of MinesGoldenCO 80401USA National Renewable Energy Laboratory(NREL) GoldenCO 80401USA Energy Research Center Lehigh UniversityBethlehemPA 18015USA Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education Southeast UniversityNanjing 210096China Department of Mechanical Engineering and Mechanics Lehigh UniversityBethlehemPA 18015USA Mechanical Engineering Universidad Michoacán de San Nicolas de HidalgoMoreliaMichoacán C.P.58030Mexico Energy Geosciences Division Lawrence Berkeley National LaboratoryUniversity of CaliforniaBerkeleyCA 94720USA

A comprehensive thermo-economic model combining a geothermal heat mining system and a direct supercritical CO_(2) turbine expansion electric power generation system was proposed in this *** by this integrated model,thermo-economic and optimization analyses for the key design parameters of the whole system including the geothermal well pattern and operational conditions were performed to obtain a minimal levelized cost of electricity(LCOE).Specifically,in geothermal heat extraction simulation,an integrated wellbore-reservoir system model(T2Well/ECO_(2)N)was used to generate a database for creating a fast,predictive,and compatible geothermal heat mining model by employing a response surface methodology.A parametric study was conducted to demonstrate the impact of turbine discharge pressure,injection and production well distance,CO_(2) injection flowrate,CO_(2) injection temperature,and monitored production well bottom pressure on LCOE,system thermal efficiency,and capital *** was found that for a 100 MWe power plant,a minimal LCOE of$0.177/kWh was achieved for a 20-year steady operation without considering CO_(2) sequestration *** addition,when CO_(2) sequestration credit is$1.00/t,an LCOE breakeven point compared to a conventional geothermal power plant is achieved and a breakpoint for generating electric power generation at no cost was achieved for a sequestration credit of $2.05/t.

关键词： geothermal heat mining supercritical CO_(2) power generation thermo-economic analysis optimization

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High Performance Novel Square Root Architecture Using Ancient Indian Mathematics for High Speed Signal Processing

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Advances in Pure Mathematics 2015年第8期5卷 428-441页

作者： arindam banerjee Aniruddha Ghosh Mainuck Das Department of ECE JIS College of Engineering Kalyani India

Novel high speed energy efficient square root architecture has been reported in this paper. In this architecture, we have blended ancient Indian Vedic mathematics and Bakhshali mathematics to achieve a significant amount of accuracy in performing the square root operation. Basically, Vedic Duplex method and iterative division method reported in Bakhshali Manuscript have been utilized for that computation. The proposed technique has been compared with the well known Newton-Raphson’s (N-R) technique for square root computation. The algorithm has been implemented and tested using Modelsim simulator, and performance parameters such as the number of lookup tables, propagation delay and power consumption have been estimated using Xilinx ISE simulator. The functionality of the circuitry has been checked using Xilinx Virtex-5 FPGA board.

关键词： Vedic Mathematics Bakhshali Mathematics Duplex Yavadunam Sutra

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Design of a Novel Signed Binary Subtractor Using Quantum Gates

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Journal of Quantum Computing 2022年第3期4卷 121-133页

作者： arindam banerjee Aniruddha Ghosh Mainuck Das ICFAI University Tripura KamalghatAgartalaWest TripuraIndia JIS College of Engineering KalyaniNadiaWest Bengal741235India

In this paper,focus has been given to design and implement signed binary subtraction in quantum *** the type of operand may be positive or negative,therefore a novel algorithm has been developed to detect the type of operand and as per the selection of the type of operands,separate design techniques have been developed to make the circuit compact and work very *** separate methods have been shown in the paper to perform the signed *** results show promising for the second method in respect of ancillary input count and garbage output count but at the cost of quantum cost.

关键词： Signed subtraction reversible logic quantum gates

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Large-signal characterizations of DDR IMPATT devices based on group Ⅲ–Ⅴ semiconductors at millimeter-wave and terahertz frequencies

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Journal of Semiconductors 2014年第8期35卷 69-78页

作者： Aritra Acharyya Aliva Mallik Debopriya banerjee Suman Ganguli arindam Das Sudeepto Dasgupta J.P.banerjee Institute of Radio Physics and Electronics University of Calcutta 92 APC Road Kolkata 700009 India Supreme Knowledge Foundation Group of Institutions Mankundu Hooghly West Bengal 712139 India

Large-signal （L-S） characterizations of double-drift region （DDR） impact avalanche transit time （IM- PATT） devices based on group III-V semiconductors such as wurtzite （Wz） GaN, GaAs and InP have been carried out at both millimeter-wave （mm-wave） and terahertz （THz） frequency bands. A L-S simulation technique based on a non-sinusoidal voltage excitation （NSVE） model developed by the authors has been used to obtain the high frequency properties of the above mentioned devices. The effect of band-to-band tunneling on the L-S properties of the device at different mm-wave and THz frequencies are also investigated. Similar studies are also carried out for DDR IMPATTs based on the most popular semiconductor material, i.e. Si, for the sake of comparison. A compara- tive study of the devices based on conventional semiconductor materials （i.e. GaAs, InP and Si） with those based on Wz-GaN shows significantly better performance capabilities of the latter at both mm-wave and THz frequencies.

关键词： DDR IMPATTs GaN group Ⅲ-Ⅴ large-signal simulation millimeter-wave terahertz regime wurtzite

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Study of flow characteristics within randomly distributed submerged rigid vegetation

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Journal of Hydrodynamics 2019年第2期31卷 358-367页

作者： Paromita Chakraborty arindam Sarkar School of Civil Engineering Kalinga Institute of Industrial Technology(KIIT)Deemed to be UniversityBhubaneswarOdishaIndia School of Infrastructure Indian Institute of Technology(IIT)Bhubaneswar AurgulBhubaneswarOdishaIndia

Flow through submerged rigid vegetation has been studied both analytically and *** Reynolds stress,present in the governing equation,has been modeled using one of the turbulent stress equations,adopted in numerous *** adva ntage of this turbulent stress model is to replace the mixing length non linear term of the stress with a linear relatio n between stress and the velocity *** velocity field and shear stress are obtained by solving the governing force balance equation numerically.A correlation,validated with the experimental results,has been developed for the relevant non-dimensional numbers.

关键词： Submerged vegetation Reynolds stress drag force stream wise velocity

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Assessment of the fraction of bed load concentration towards the sediment transport of a monsoon-dominated river basin of Eastern India

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Journal of Geographical Sciences 2023年第5期33卷 1023-1054页

作者： KAR Rohan SARKAR arindam School of Infrastructure Indian Institute of Technology BhubaneswarArgulKhordhaOdisha 752050India

Given the challenges of re-creating complex bed load(BL)transport processes in rivers,models are preferred over gathering and examining field *** highlight of the present research is to develop an approach to determine the ungauged bed load concentration(BLC_(u))utilizing the measured suspended sediment concentration(SSC)and hydraulic variables of the last four decades for the Mahanadi River *** technique employs shear stress and SSC equations for turbulent open channel ***,the predicted BLC_(u)is correlated with SSC using a power relation to estimate BLC_(u)on the river and ***,different BL functions(BLF)efficiency is assessed across *** model predicted BLC_(u)is comparable with the published data for sandy rivers and falls within±20%.Outliers in hydraulic and sedimentological statistics significantly influence estimating the BL fraction apart from higher relative ratios and catchment *** constants of power functions are physically linked to sediment transport configuration,mechanism,and inflow to the *** stream power-based BLF best predicts the BL transport,followed by shear stress and unit discharge *** disparity in the estimation of BLC_(u)results from station-specific physical factors,sampling data dispersion,and associated uncertainties.

关键词： Mahanadi River Basin ungauged bed load concentration suspended sediment concentration correlations bed load functions

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A Kenmotsu Metric as a *-conformal Yamabe Soliton with Torse Forming Potential Vector Field

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Acta Mathematica Sinica,English Series 2021年第12期37卷 1896-1908页

作者： Soumendu ROY arindam BHATTACHARYYA Department of Mathematics Jadavpur UniversityKolkata 700032India

The purpose of the present paper is to deliberate *-conformal Yamabe soliton,whose potential vector field is torse-forming on Kenmotsu ***,we have shown the nature of the soliton and find the scalar curvature when the manifold admitting *-conformal Yamabe soliton on Kenmotsu ***,we have evolved the characterization of the vector field when the manifold satisfies *-conformal Yamabe *** we have embellished some applications of vector field as torse-forming in terms of *-conformal Yamabe soliton on Kenmotsu *** have developed an example of *-conformal Yamabe soliton on 3-dimensional Kenmotsu manifold to prove our findings.

关键词： *-conformal Yamabe soliton torse forming vector field conformal Killing vector field Kenmotsu manifold

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Optimum lateral extent of soil domain for dynamic SSI analysis of RC framed buildings on pile foundations

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Frontiers of Structural and Civil Engineering 2020年第1期14卷 62-81页

作者： Nishant SHARMA Kaustubh DASGUPTA arindam DEY Department of Civil Engineering Indian Institute of Technology GuwahatiGuwahati 781039India

This article describes a novel approach for deciding optimal horizontal extent of soil domain to be used for finite element based numerical dynamic soil structure interaction(SSI)*** model for a 12 storied building frame,supported on pile foundation-soil system,is developed in the finite element based software framework,*** different structure-foundation configurations are analyzed under different ground motion *** extent of soil domain,along with the soil properties,were varied exhaustively for a particular structural *** on the reduction in the variation of acceleration response at different locations in the SSI system(quantified by normalized root mean square error,NRMSE),the optimum lateral extent of the soil domain is prescribed for various structural widths,soil types and peak ground acceleration levels of ground *** to the past studies,error estimation analysis shows that the relationships prescribed in the present study are credible and more inclusive of the various factors that influence *** relationships can be readily applied for deciding upon the lateral extent of the soil domain for conducting precise SSI analysis with reduced computational time.

关键词： soil structure interaction optimum lateral extent of soil domain length multi-storyed framed building pile foundation OpenSEES L-K boundaries dynamic analysis

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Analysis of flow over backward facing step with transition

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Frontiers of Structural and Civil Engineering 2015年第1期9卷 71-81页

作者： Dwarikanath RATHA arindam SARKAR Civil Engineering Department Thapar University Patiala Punjab 147001 India School of Infrastructure Indian Institute of Technology Bhubaneswar 751013 India

The present study deals with the study of the velocity distribution and the separation phenomenon of flow of air over a two dimensional backward facing step. The flow of air over a backward facing step has been investigated numerically using FLUENT. Flow simulation has been carried out in a backward facing step having an expansion ratio （ratio of the height before and after the step） of 1：1.94 and the results obtained are compared with the published experimental results. Comparison of flow characteristics between steps with three different transitions is made. The variation ofreattachment length for all the three cases are analyzed for wide range of Reynolds number ranging from 100 to 7000 which covers the laminar, transition and turbulent flow of air. Simulation of the flow over steps with expansion ratios of 1：1.24, 1：1.38, 1：1.47, 1：1.53, 1：1.94, 1：2.20 are also carried out to examine the effect of different expansion ratios on the reattachment length. It is found that the primary reattachment length increases with increase in the expansion ratio. The primary reattachment length at the bottom wall downstream of the step is minimum for the step with round edged transition and maximum for the step with a vertical drop transition.

关键词： Reattachment length backward facing step transition flow separation k-ε model

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Assessment of bearing capacity of interfering strip footings located near sloping surface considering artificial neural network technique

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Journal of Mountain Science 2018年第12期15卷 2766-2780页

作者： Rana ACHARYYA arindam DEY Department of Civil Engineering Indian Institute of Technology Guwahati

The bearing capacity of interfering footings located near the slope face suffers from reduced bearing capacity due to the formation of the curtailed passive zone. Depending upon the position of the footing, their spacing and steepness of the slope different extents of bearing capacity reduction can be exhibited. A series of finite element investigation has been done with the aid of Plaxis 3 D v AE.01 to elucidate the influence of various geotechnical and geometrical parameters on the ultimate bearing capacity of interfering surface strip footings located at the crest of the natural soil slope. Based on the large database obtained from the numerical simulation, a6-8-1 Artificial Neural Network architecture has been considered for the assessment of the ultimate bearing capacity of interfering strip footings placed on the crest of natural soil slope. Sensitivity analyses have been conducted to establish the relative significance of the contributory parameters, which exhibited that for the stated problem, apart from shear strength parameters, the setback ratio and spacing of footing are the prime contributory parameters.

关键词： Interfering strip footing Natural slope Finite element simulation Artificial Neural Network Sensitivity analysis Prediction model

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