Now showing items 1-20 of 1686

    • 1D modelling of membrane-assisted chemical looping reforming 

      Francisco Morgado, Joana; Cloete, Schalk Willem Petrus; Morud, John; Gurker, Thomas; Quinta-Ferreira, Rosa; Amini, Shahriar (Journal article; Peer reviewed, 2017)
      Membrane-assisted chemical looping reforming (MA-CLR) has been proposed as an alternative to the conventional CLR technology. In this work, a non-isothermal 1D model is used to simulate the MA-CLR fuel reactor. The effect ...
    • 1-D phenomenological modelling of gas-solid fluidized bed reactors for chemical looping reforming 

      Morgado, Joana Francisco (Doctoral theses at NTNU;2018:9, Doctoral thesis, 2018)
      This PhD thesis is a part of the EU FP7 Project called NanoSim. The main objective of this work is to develop a 1-D phenomenological model for fluidized bed reactors to simulate the performance of second-generation CO2 ...
    • 3D Simulering av pumpeturbinkarakteristikker 

      Olimstad, Grunde (Master thesis, 2009)
      I oppgaven har karakteristikkene for en pumpeturbin blitt simulert. Verktøyet for simuleringene har vært OpenFOAM. Griddene til simuleringene ble laget i Gambit og ble importert til OpenFOAM via fluent gridformat. Geometrien ...
    • A 7-field Lagrangian slug capturing and slug tracking model with higher order methods 

      Smith, Ivar Eskerud (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. ...
    • Absorber for concentrating solar heat collectors 

      Veslum, Trygve Stansberg (Master thesis, 2011)
      Open volumetric absorbers have been tested and evaluated with the objective to determine their ability to heat air for small scale concentrating solar systems, more exactly a solar oven where a stove is heated up by a rock ...
    • A Building Information Model (BIM) Based Lifecycle Assessment of a University Hospital Building Built to Passive House Standards 

      Grann, Blane (Master thesis, 2012)
      This thesis undertook a whole building lifecycle assessment of a university hospital building in Trondheim, Norway designed to passive house standards. The delivered energy for electricity and heating was estimated to be ...
    • A cartesian cut-cell method, based on formal volume averaging of mass, momentum equations 

      Dang, Son Tung; Johansen, Stein Tore; Meese, Ernst A. (Chapter, 2017)
      Simulation of multiphase flows are generally treated by various classes of Eulerian methods, Lagrangian methods and various combinations of these. In the SIMCOFLOW initiative we have set out to develop a framework for ...
    • A case study of life cycle impacts of small-scale fishing techniques in Thailand 

      Verones, Francesca; Bolowich, Alya Francesca; Ebata, Keigo; Boutson, Anukorn; Takafumi, Arimoto; Ishikawa, Satoshi (Journal article; Peer reviewed, 2017)
      Fish provides an important source of protein, especially in developing countries, and the amounts of fish consumed are increasing worldwide (mostly from aquaculture). More than half of all marine fish are caught by small-scale ...
    • Accurate measurements of CO2 rich mixture phase equilibria relevant for CCS transport and conditioning 

      Stang, Hans Georg Jacob; Løvseth, Sigurd Weidemann; Størset, Sigmund Østtveit; Malvik, Bjarne; Rekstad, Inge Håvard (Journal article; Peer reviewed, 2013)
      This paper describes the experimental rig that has been constructed for the measurements of phase equilibrium of CO2-rich mixtures under relevant conditions for CCS transport and conditioning. The rig is believed to have ...
    • Accurate phase equilibrium measurements of CO2 mixtures 

      Westman, Snorre Foss; Stang, Hans Georg Jacob; Størset, Sigmund Østtveit; Rekstad, Inge Håvard; Austegard, Anders; Løvseth, Sigurd Weidemann (Journal article; Peer reviewed, 2014)
      A new setup for accurate measurement of phase behavior of CO2-rich mixtures relevant for CCS has been designed, covering a range between - 60 and 150 °C in temperature and 0.4 and 20 MPa in pressure. In order to design ...
    • A CFD-model of the Fluid Flow in a Hydrogen Peroxide Monopropellant Rocket Engine in ANSYS Fluent 16.2 

      Vestnes, Frida (Master thesis, 2016)
      The use of hydrazine in monopropellant thrusters has dominated the market for several decades. Due to the toxic nature of hydrazine, the interest in developing thrusters based on green propellants has increased. A common ...
    • Acid Gas Removal in Geothermal Power Plant in Iceland 

      Berstad, David Olsson; Nord, Lars O. (Journal article; Peer reviewed, 2016-01)
      A large part of the energy covering the electricity and heating demands in Iceland is generated in geothermal power plants. The Hellisheiði power plant, designed for 300 MWe and 133 MWth, is located in close proximity to ...
    • A comparative Analysis of Propane and Ethylene Glycol as Intermediate Fluid in a LNG Regasification System 

      Solberg, Erik Langaard (Master thesis, 2015)
      A LNG regasification system with intermediate fluid vaporizer is studied. Two different intermediate fluids (IF), propane and a mix of mono-ethylene glycol and water, are compared for use in the system. The regasification ...
    • A Comparative Life Cycle Assessment of PV Solar Systems 

      Bekkelund, Kristine (Master thesis, 2013)
      In this report, a comparative life cycle assessment (LCA) of a rooftop, grid-connected photovoltaic (PV) system has been conducted. The primary objective has been to assess the environmental impacts resulting from the PV ...
    • A comparative study of energy certification systems for buildings 

      Milicevic, Jelena (Master thesis, 2014)
      Due to the large amount of energy consumption in buildings and the biggest potential of energy and ecology savings, energy efficiency and sustainable construction represent the priorities of modern architecture and energetics ...
    • A Comparison of Post-combustion Capture Technologies for the NGCC 

      Subramanian, Avinash Shankar Rammohan; Jordal, Aina Benedikte Kristin; Anantharaman, Rahul; Hagen, Brede Andre Larsen; Roussanaly, Simon (Journal article; Peer reviewed, 2017)
      Four different post-combustion capture technologies are compared for the same NGCC (electric efficiency 58.1% without CO2 capture). The technologies are aqueous amine, polymeric membranes, a low temperature sorbent and ...
    • A comprehensive model for char particle conversion in environments containing O2 and CO2 

      Haugen, Nils Erland L; Mitchell, Reginald E.; Tilghman, Matthew B. (Journal article; Peer reviewed, 2015)
      In this work, conversion of char is studied in a simulation code that includes a simplified heterogeneous adsorption–desorption reaction mechanism for char chemical reactivity and uses GRI-Mech 3.0 as the chemical kinetic ...
    • Active and passive measures to maintain pressure in LNG fuel systems for ships 

      Hernes, Hugo Eugen (Master thesis, 2015)
      The purpose of this master thesis is to investigate the effects of active and passive measures to maintain the pressure in LNG fuel systems for ships. The background was two de-loading events that occurred on the gas engines ...
    • Adapting the Design Procedures of Heat Pump Systems to nZEB 

      Ytterhus, Mikkel (Master thesis, 2015)
      Several changes in the previous Simulink model have been conducted. This have significantly reduced computational time and made the model more user friendly. A more realistic representation of the ground source and the ...
    • Adaption of a two phase solver for axisymmetric problems 

      Liestøl, Lars (Master thesis, 2012)
      This report documents the adaptation of a two dimensional two phaseNavier-Stokes solver to axisymmetric problems. The changes fromCartesian to cylindrical coordinates are thoroughly described with finitedifference methods ...