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Temperature-aware Power Dissipation Analysis in Hyperscale Data Centers
, Ph.D. Dissertation Sharif University of Technology ; Sarbazi-Azad, Hamid (Supervisor)
Abstract
Hyperscale cloud data center (HCDC) (a.k.a., hyperscale data center) is the backbone of a wide variety of Internet services such as web-hosting, ecommerce, social networking, software as a service (SaaS), platform as a service (PaaS), application as a service (AaaS), and cloud computing.HCDC platforms consist of massive parallel processing, high utilization rate, and high volume storage that cost hundreds of million dollars.The increased demand for various Internet services and the subsequent dramatic growth in HCDC platforms, have caused an exponential increase in utilization of energy. With energy costs on the rise and global attention focused on carbon footprints, organizations are...
Green balance software: An integrated model for screening of CO2 -EOR and CCS projects
,
Article
Energy Sources, Part A: Recovery, Utilization and Environmental Effects
;
Volume 37, Issue 14
,
2015
,
Pages 1479-1486
;
15567036 (ISSN)
; Bolouri, S. H
;
Sharif University of Technology
Taylor and Francis Inc
2015
Abstract
An integrated model is proposed for simultaneous study of CO2 -flood enhanced oil recovery and sequestration in both technical and economic points of view. Based on this model, Green Balance software is developed for quick estimation of performance and profitability of CO2 -flood enhanced oil recovery and carbon capture and storage projects. This software benefits users to do sensitivity analyses in extended times, easily and quickly. Several sensitivity analyses were done and effects of reservoir parameters and economic expenditures and taxes were studied. Among all affecting parameters, the role of tax per CO2 emission is the most important one. The use of...
A technical and economic assessment of variants for CO2 separation from synthesis gas
, Article Energy Sources, Part B: Economics, Planning and Policy ; Volume 11, Issue 12 , 2016 , Pages 1097-1102 ; 15567249 (ISSN) ; Nouri Khorasani, A ; Baghalha, M ; Pazos Costa, A ; Sharif University of Technology
Taylor and Francis Inc
2016
Abstract
An analysis of carbon dioxide (CO2) removal process from synthesis gas has been carried out in this work. CO2 removals by physical and chemical solvents are the most often used. The most important factors that affect cost and performance of a CO2 recovery unit are the number of flash drum separation units, and the pressure drop pattern among them. Different variations of this process were simulated using Hysys software, and the capital and operational expenditures for these plants were estimated. The focus was to reach an optimum process to minimize the total unit cost of separated CO2. The results indicate that for a fixed number of separation units, the case with uniform pressure drop...
Experimental and numerical study of the gas-gas separation efficiency in a Ranque-Hilsch vortex tube
, Article Separation and Purification Technology ; Vol. 138, issue , Dec , 2014 , p. 177-185 ; Farhadi, F ; Sharif University of Technology
Abstract
A brass vortextube is used to carry out a series of experiments. The main objective of the present research is to investigate the separation performances of a vortex tube (VT) for a hydrocarbon mixture. Examination is also applied to study the effects of nozzle intakes number and cold fraction on the gas species separation at specific inlet pressure 236.37 kPa in a VT with two gas mixtures (LPG as a hydrocarbon mixture and LPG-N2). A two-dimensional computational fluid dynamic (CFD) model simulation of a VT is presented. CFD code after validation is also applied to investigate the role of cold fraction and nozzle intakes number on the gas species separation. The highly rotating flow field...
Energy-efficient fast configuration of flexible transponders and grooming switches in OFDM-based elastic optical networks
, Article Journal of Optical Communications and Networking ; Volume 10, Issue 2 , 2018 , Pages 90-103 ; 19430620 (ISSN) ; Pakravan, M. R ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
We investigate the problem of energy-efficient resource allocation constrained to quality of service and physical requirements in orthogonal frequency division multiplexing (OFDM)-based elastic optical networks and propose a fast two-stage algorithm to solve it. The first stage of the proposed algorithm deals with routing, traffic grooming, and traffic ordering and mainly aims at minimization of the number of deployed optical amplifiers and transponders. We provide an integer linear program for routing and traffic grooming and propose a heuristic procedure, which yields its near-optimum solution in a shorter runtime. In the second stage, we optimize transponder parameters to minimize total...