Browsing Institutt for energi og prosessteknikk by Title
Now showing items 25-44 of 4249
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A Detached-Eddy-Simulation study: Proper-Orthogonal-Decomposition of the wake flow behind a model wind turbine
(Journal article; Peer reviewed, 2018)In times of intense renewable energy development, the planning of wind farms and the improvement of their total efficiency has become a major field of research. A precise analysis of the velocity deficit, fluctuation load ... -
A Dimensional-Decomposition Approach for Stochastic Scale-Resolving Simulations of Turbulent Reacting Flows
(Doctoral theses at NTNU;2018:399, Doctoral thesis, 2018)High-fidelity and reliable numerical design tools are main keys to the development of novel gas turbines for hydrogen-rich fuels. However, state-of-the-art simulation tools for the most part only give a bulk approximation ... -
A fast-solving particle model for thermochemical conversion of biomass
(Journal article; Peer reviewed, 2020)Computational fluid dynamics (CFD) simulations of large-scale furnaces or reactors for thermal conversion of solid fuels remains challenging partially due to the high computational cost related to the particle sub-models. ... -
A Feasibility Study of Hydrogen Production at Hitra
(Bachelor thesis, 2020)Klimaendringer og global oppvarming krever omstillinger i flere sektorer. Spesielt transportsektoren bidrar med store klimagassutslipp, som skyldes bruken av fossilt drivstoff. Hydrogengass er en energibærer med høy spesifikk ... -
A Feasibility Study of Large Scale Wind Powered Hydrogen Production
(Bachelor thesis, 2021)Det er skiftende tider, og verden gjennomgår for tiden en omstilling fra en levemåte basert på fossile brenselskilder, til et fornybart og utslippsfritt samfunn. Land over hele verden viser handlingskraft i forbindelse med ... -
A feasibility study of wind powered hydrogen production at Fosen
(Master thesis, 2019)Hydrogen (di-hydrogen, H2) er et ettertraktet drivstoff fordi det er det vanligste og letteste stoffet i universet, med to til tre ganger høyere energitetthet enn tradisjonelle drivstoff. Hydrogen kan produsere energi og ... -
A Field Study of Reduced Axial Compressor Performance Deterioration through Online Washing and Air Intake Filtration Upgrade
(Doctoral theses at NTNU;2018:300, Doctoral thesis, 2018)Background Oil and gas production at several North Sea offshore installations is limited by the gas turbine power available, and any deterioration in gas turbine performance directly affects production rates. Fouling in ... -
A Forecasting Model for Wind using Measured Correlation
(Master thesis, 2012)Wind power is currently one of the fastest growing power generation sectors in the world. The intermittent and random nature of wind energy, however, poses difficulties when integrating it into the electricity grid. ... -
A framework for mixing-reaction closure with the Linear Eddy Model
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:53, Doctoral thesis, 2010)This thesis presents a novel framework for mixing-reaction closure build on the Linear Eddy Model by Kerstein (1991B). The development of the modeling concept has been motivated by the need for better predictive tools for ... -
A framework for modeling internal mass transfer in atmospheric freeze drying
(Doktoravhandlinger ved NTNU, 1503-8181; 2011:106, Doctoral thesis, 2011)In modeling of atmospheric freeze drying (AFD), the modeling of the product is often confined to either one-dimensional models or multi-dimensional models of very basic geometries. Such models are not able to handle a ... -
A Framework for Modeling Linear Surface Waves on Shear Currents in Slowly Varying Waters
(Journal article; Peer reviewed, 2019)We present a theoretical and numerical framework—which we dub the direct integration method (DIM)—for simple, efficient, and accurate evaluation of surface wave models allowing presence of a current of arbitrary depth ... -
A Framework for Thermodynamic Design of Stirling Engines
(Master thesis, 2014)Most commercialized Stirling machines operate at high temperature differentials and ratios, therefore less is known of machines that operate at low temperatures. This thesis aims to establish specific parameters for Stirling ... -
A general data model for socioeconomic metabolism and its implementation in an industrial ecology data commons prototype
(Journal article; Peer reviewed, 2019)Until this day, data in industrial ecology (IE) have been commonly seen as existing within the domain of particular methods or models, such as input–output, life cycle assessment, urban metabolism, or material flow analysis ... -
A generic lifetime estimation model for Francis turbines
(Master thesis, 2022)Ettersom mer intermitterende energikilder kobles til strømnettet må Francisturbiner i økende grad tilby balanseringstjenester. Dette fører til at turbinene periodisk opererer i suboptimale konfigurasjoner. Siden Francisturbiner ... -
A Global Model for Marine Invasive Species Distribution via Plastic Debris
(Master thesis, 2023)Marine økosystemer trues av spredningen av fremmede arter gjennom konkurranse om ressurser, endring av habitat og overføring av sykdommer. Disse faktorene kan akselerere nedgangen til innfødte arter og forstyrre økosystemers ... -
A Highly-Efficient and Stable Catalyst based on Co(OH)2@Ni Electroplated on Cu-Metallized Cotton Textile for Water Splitting
(Journal article; Peer reviewed, 2019)The concept of using renewable energy to power water electrolyzers is seen as a favorable approach for the production of green and sustainable hydrogen. The electrochemical water splitting can be significantly and efficiently ... -
A Hybrid Biomass Hydrothermal Gasification- Solid Oxide Fuel Cell System Combined with Improved CHP Plant for Sustainable Power Generation
(Journal article; Peer reviewed, 2017)The most popular technique, so far, for biomass waste to energy conversion has been incineration, but this technique has raised a lot of objection among nature activists due to the release of particulate matter and pollutants ... -
A kinetic study on simultaneously boosting the mass and fixed-carbon yield of charcoal production via atmospheric carbonization
(Journal article; Peer reviewed, 2017)The mass and fixed-carbon yield of charcoal produced from woody biomass via atmospheric carbonization can be simultaneously improved by harnessing the phenomenon of secondary char formation as a result of prolonged contact ... -
A Lagrangian Slug Capturing Scheme for Gas-Liquid Flows in Pipes
(Doktoravhandlinger ved NTNU, 1503-8181; 2007:145, Doctoral thesis, 2007)In this thesis a new Lagrangian numerical scheme for the simulation of gas-liquid flows in pipelines is presented. Based on an approximate two-fluid model, this new scheme, called LASSI (Lagrangian Approximate Scheme for ... -
A Life Cycle Assessment of a waste management system introducing sorting of food waste and a central sorting facility
(Master thesis, 2022)EU krever at alle medlemsland skal sortere matavfall og øke resirkulering til seksti prosent innen 2030. I Norge ønsker Fredrikstad kommune å finne løsninger for å nå disse målene. Denne oppgaven undersøker hva slags ...