Browsing Institutt for energi og prosessteknikk by Subject "VDP::Technology: 500::Environmental engineering: 610"
Now showing items 1-20 of 136
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A 7-field Lagrangian slug capturing and slug tracking model with higher order methods
(Doctoral theses at NTNU;2017:246, Doctoral thesis, 2017)In this thesis, a 7-field Lagrangian slug capturing and slug tracking model with higher order methods and an adaptive grid is investigated for predicting the behaviour of two-phase gasliquid flow in multiphase flow pipelines. ... -
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 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 Multiphase Pump Experimental Analysis
(Doctoral thesis at NTNU;2016:215, Doctoral thesis, 2016)This research project focuses on the characterization of the behaviour of a mixed-flow pump under off-design conditions and two-phase operation, in terms of performance degradation and instabilities. The recent multiphase ... -
A New Extended Corresponding States Equation of State for Modelling CO2-Water Thermodynamics - A Compromise for CFD
(Doctoral theses at NTNU;2017:264, Doctoral thesis, 2017)This PhD work is part of the CO2 Dynamics project in collaboration with Sintef Energy. We investigated the importance of accurate modelling of CO2 thermodynamic properties for process design. The study was conducted for ... -
Advancements in environmentally extended multiregional input-output analysis: modeling drivers, pressures, and impacts
(Doctoral theses at NTNU;2021:210, Doctoral thesis, 2021)We increasingly need to rely on demand side changes to complement technological improvements to mitigate environmental impacts such as global warming and loss of biodiversity. To do so we must better understand how different ... -
Advancing sustainable land and water management strategies for deployment of bioenergy production systems
(Doctoral theses at NTNU, 2022:115, Doctoral thesis, 2022)Bioenergy is a necessity in most climate change mitigation scenario limiting global warming to below 2°C at the end of century relative to pre-industrial times. The large landrequirements associated with large-scale ... -
Aerodynamic Optimisation of Airfoils and Winglets for Wind Turbine Application
(Doctoral theses at NTNU;2017:263, Doctoral thesis, 2017)The presented thesis summarises work on applying evolutionary optimisation algorithms for the design of airfoils and winglets for wind turbine application. This approach is more computationally expensive than using traditional ... -
Artificial Thawing of Seasonally Frozen Ground: Performance Characteristics of Hydronic Based Thawing
(Doctoral theses at NTNU;2017:321, Doctoral thesis, 2017) -
Beyond life cycle assessment: Building a methods extension ecosystem for the environmental assessment of emerging technologies
(Doctoral theses at NTNU;2023:110, Doctoral thesis, 2023)The world is undergoing unprecedented rapid technological and climatic change. The urgency with which we must address the challenges of said climatic change increases with each passing day of inaction. Technology is often ... -
Building design strategy for cold climate using passive design and renewable technologies
(Doctoral theses at NTNU;2017:168, Doctoral thesis, 2017)This thesis presents an analysis of various measures and technologies leading to establishing a strategy to achieve energy efficiency in buildings, particularly in the context of Kazakhstan. The developed strategies can ... -
Bulk and interfacial thermodynamics of mixtures: From aqueous systems to ultracryogenic fluids
(Doctoral theses at NTNU;2020:38, Doctoral thesis, 2020) -
A Cartesian Cut-Cell Methodology, Applied to Large Scale Interface Dynamics and Wave Impacts Spray Formation
(Doctoral theses at NTNU;2020:277, Doctoral thesis, 2020)The present thesis focus on developing numerical methods that can resolve various problems in computational fluid dynamics. The Cartesian cut-cell method is used to solve continuity and momentum equations. The method will ... -
CFD Modelling for Improved Components in CO2 and Ammonia Vapour Compression Systems
(Doctoral theses at NTNU;2023:180, Doctoral thesis, 2023)Refrigeration and heat-pumping systems are shifting to natural, environmentallyfriendly refrigerants like CO2 to combat global warming. Ejectors are often used in these systems for expansion work recovery to enhance ... -
Colliding jamming fronts in a dense suspension
(Doctoral theses at NTNU;2021:366, Doctoral thesis, 2021)Mixtures of liquids and solid particles, known as suspensions, are a quite common material both in natural and industrial processes. For a high concentration of particles, some of these mixtures exhibit a quite remarkable ... -
Combustion modeling in turbulent boundary-layer flows
(Doktor ingeniøravhandling;2003:38, Doctoral thesis, 2003)This thesis presents an investigation of turbulence modeling and chemical-kinetics effects, including local extinction, for turbulent reacting boundary-layer flows by using Favre-averaged Navier-Stokes equations. Local ... -
Computational fluid dynamics (CFD) modeling for biomass and wate to energy production
(Doctoral theses at NTNU;2021:177, Doctoral thesis, 2021)Solid fuel particles are usually modeled as point particles in simulations using the Eulerian-Lagrangian approach. The particles and gas phases can be resolved on vastly different scales. Since the particles are treated ... -
Computational Fluid Dynamics Modeling of Flow and Heat Transfer i Fin-Tube Bundles
(Doctoral theses at NTNU;2019:18, Doctoral thesis, 2019)Steam bottoming cycles, powered by gas turbine exhaust heat, are considered for offshore applications as a means of increasing the energy efficiency of power supply and reducing CO2 emissions from oil and gas production. ... -
Conical micro-structures for super-repellent surfaces and their effect on droplet impact
(Doctoral theses at NTNU;2021:235, Doctoral thesis, 2021)Surface wetting properties control is crucial to various applications, such as anti-wetting, self cleaning and heat transfer processes. Design of surface wetting properties can be achieved by mechanical and chemical methods. ... -
Continuous Efficiency Measurements on Hydro Power Plants
(Doctoral theses at NTNU;2016:330, Doctoral thesis, 2016)In 2012 the largest Norwegian power production company Statkraft initiated a research and development project initially named BlackBox. The company’s main objective for the project was to develop an experimental condition ...