Browsing NTNU Open by Author "Ertesvåg, Ivar Ståle"

Advanced exergy analysis of the oil and gas processing plant on an offshore platform: A thermodynamic cycle approach

Sheng, Juejing; Voldsund, Mari; Ertesvåg, Ivar Ståle (Peer reviewed; Journal article, 2023)

Ambitious targets on reduction of greenhouse-gas emissions have motivated further studies to improve energy efficiency in offshore gas and oil production. Identifying the causes of inefficiencies and the improvement ...

An Extended Corresponding States Equation of State (EoS) for CCS Industry

Ibrahim, Mohamed; Skaugen, Geir; Ertesvåg, Ivar Ståle (Journal article; Peer reviewed, 2015)

For a good design of all the processes in Carbon Capture and Storage, the thermodynamics of the CO2 and CO2 mixtures should be accurately predicted. Among these mixtures are CO2-water systems that are very difficult to ...

Analysis of Some Recently Proposed Modifications to the Eddy Dissipation Concept (EDC)

Ertesvåg, Ivar Ståle (Journal article; Peer reviewed, 2020)

The widespread use of the Eddy Dissipation Concept (EDC) of Magnussen has led to a number of suggestions to modify the model. These modifications are to a varying extent in agreement with the underlying ideas of EDC. This ...

Analysis of the Eddy Dissipation Concept formulation for MILD combustion modelling

Lewandowski, Michal T; Ertesvåg, Ivar Ståle (Journal article, 2018)

Performance of the Eddy Dissipation Concept (EDC) in the regime of Moderate and Intense Low-oxygen Dilution (MILD) combustion is investigated. The special MILD features, where chemical and turbulence time scales are ...

Assessment of algebraic subgrid scale models for the flow over a triangular cylinder at Re = 45000

Lysenko, Dmitry; Ertesvåg, Ivar Ståle (Peer reviewed; Journal article, 2021)

The turbulent separated flow over an equilateral triangular cylinder at a Reynolds number 45000 (based on the triangle edge) is studied by means of large-eddy simulation (LES). The moderate Reynolds number is chosen in ...

Biomass gasification integration in recuperative gas turbine cycles and recuperative fuel cell integrated gas turbine cycles: -

Løver, Kristian Aase (Master thesis, 2007)

A multi-reactor, multi-temperature, waste-heat driven biomass thermochemical converter is proposed and simulated in the process simulation tool Aspen Plus . The thermochemical converter is in Aspen Plus integrated with a ...

Coal-fired Power Plants based on Oxy-combustion with Carbon Capture: Combustion Conditions and Water Consumption

Almås, Karen (Master thesis, 2012)

Nesten all konvensjonell dampkraftproduksjon er avhengig av vann for kjøling. Tilgang til vann er også nødvendig i drift av flere andre delsystemer i et slikt kraftverk. I tillegg medfører integrasjon av CO2 fangst ofte ...

Compressible flows in process equipment: Problems, methods and models

Skrataas, Stine Mia Rømmesmo (Master thesis, 2011)

SIMPLE, SIMPLER, SIMPLEC and IDEAL are solution procedures originally developed for incompressible flows and staggered grids. For SIMPLE, SIMPLER and SIMPLEC, extensions for collocated grids and for treatment of flows at ...

Computational analysis of premixed methane-air flame interacting with a solid wall or a hydrogen porous wall

Salimath, Prashant; Ertesvåg, Ivar Ståle; Gruber, Andrea (Peer reviewed; Journal article, 2020)

The process of flame-wall interaction for premixed methane-air flames is investigated by direct numerical simulation. The flames propagate towards an isothermal, chemically inert surface, consisting of either a solid ...

Development of a turbulence dissipation based reaction rate model for progress variable in turbulent premixed flames

Tomasch, Stefanie; Swaminathan, Nedunchezhian; Spijker, Christoph; Ertesvåg, Ivar Ståle (Journal article; Peer reviewed, 2022)

This study presents an algebraic combustion closure for Large eddy simulation (LES) exhibiting attributes of simplicity and simultaneous accuracy under realistic combustion conditions. The model makes use of the interlink ...

Discharge and Spreading of Carbon Dioxide from Leakages

Brox, Eivind (Master thesis, 2013)

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Effect of the turbulent flow field on NOx formation in a hydrogen flame

Ertzgaard Solvang, Sindre (Master thesis, 2023)

Gitt den økende hastigheten på klimaendringene, har behovet for å erstatte tradisjonelle fossile brensler aldri vært viktigere. Gassturbiner, som hovedsakelig bruker metan som brennstoff, bidrar betydelig til karbonutslippene ...

Effects of external cooling on smoldering fire in wood pellets

Snersrud, Dag Olav (Master thesis, 2021)

Ulmebrann er en saktegående eksoterm reaksjon, der brensel og oksygen er konsumert for å produsere varme. Det som skiller ulmebrann fra andre forbrenningsformer, er at den brenner uten en synlig flamme. Ulmebranner er også ...

Energibruk og energiutnyttelse ved Kårstø gassprosesseringsanlegg

Wølneberg, Pia Wendela (Master thesis, 2007)

Hensikten med denne masteroppgaven har vært å studere energiforbruket på Kårstø gass- prosesseringsanlegg. Økende energipriser og strengere miljøkrav fører til et økende fokus på energibesparende tiltak. Denne rapporten ...

Energieffektiv hydrogenlagring: eksergianalyse av adsorpsjon

Berntsen, Trond Einar Egeberg (Master thesis, 2012)

Hydrogenlagring er en nøkkelteknologi for etablering av en hydrogenøkonomi. Adsorpsjon er en av hydrogenlagringsteknologiene som for tiden utforskes sammen med hydrogen lagret som komprimert gass, væske, og i metallhydrider. ...

Entropy generation in an opposed-flow laminar non-premixed flame—Effects of using reduced and global chemical mechanisms for methane–air and syngas–air combustion

Lorentzen, Simon Johan; Ertesvåg, Ivar Ståle (Journal article; Peer reviewed, 2023)

The distribution of entropy generation is calculated with the aim of comparing second-law results for reduced and global mechanisms against a detailed mechanism. For methane, the DRM19 mechanism and a global, one-step ...