Blar i Institutt for energi og prosessteknikk på tittel

Viser treff 4112-4131 av 4141

    • Wind power for cooking 

      Finsås, Henrik Lund; Mjåtveit, Torbjørn Løvik (Master thesis, 2023)
      Tilgangen på elektrisitet i Tanzania har det siste tiåret vært av de raskest voksende i subsahariske Afrika, med en økende tilgang fra 7% til 37.7% mellom 2011 og 2020. Selv om tilgangen i urbane områder har nådd 73.2%, ...

    • Wind tunnel experiments on wind turbine wakes in yaw: effects of inflow turbulence and shear 

      Bartl, Jan Michael Simon; Mühle, Franz Volker; Schottler, Jannik; Sætran, Lars Roar; Peinke, Joachim; Adaramola, Muyiwa S.; Holling, Micheal (Journal article; Peer reviewed, 2018)
      The wake characteristics behind a yawed model wind turbine exposed to different customized inflow conditions are investigated. Laser Doppler anemometry is used to measure the wake flow in two planes at x∕D = 3 and x∕D = 6, ...

    • Wind tunnel experiments on wind turbine wakes in yaw: redefining the wake width 

      Schottler, Jannik; Bartl, Jan Michael Simon; Mühle, Franz Volker; Sætran, Lars Roar; Peinke, Joachim; Hölling, Michael (Journal article; Peer reviewed, 2018)
      This paper presents an investigation of wakes behind model wind turbines, including cases of yaw misalignment. Two different turbines were used and their wakes are compared, isolating effects of boundary conditions and ...

    • Wind tunnel investigation on the effect on the turbine tower on wind turbines wake symmetry 

      Pierella, F; Sætran, Lars Roar (Journal article; Peer reviewed, 2017)
      In wind farms, the wake of the upstream turbines becomes the inflow for the downstream machines. Ideally, the turbine wake is a stable vortex system. In reality, because of factors like background turbulence, mean flow ...

    • Wind tunnel model testing of offshore platforms 

      Abrahamsen, Ida Sinnes (Master thesis, 2012)
      The purpose of this thesis is to highlight some of the areas of interest when it comes to wind tunnel experimenting of offshore platforms regarding stability concerns such as critical angles and wind overturning moment. ...

    • Wind tunnel study on power output and yaw moments for two yaw-controlled model wind turbines 

      Bartl, Jan Michael Simon; Mühle, Franz Volker; Sætran, Lars Roar (Journal article; Peer reviewed, 2018)
      In this experimental wind tunnel study the effects of intentional yaw misalignment on the power production and loads of a downstream turbine are investigated for full and partial wake overlap. Power, thrust force and yaw ...

    • Wind Tunnel Study on the Tip Speed Ratio’s Impact on a Wind Turbine Wake Development 

      Neunaber, Ingrid; Hölling, Michael; Obligado, Martin (Peer reviewed; Journal article, 2022)
      (based on the turbine diameter and the freestream velocity). For all cases, the mean streamwise velocity deficit at the centerline evolves close to a power law in the far wake, and we check the validity of the Jensen and ...

    • Wind Turbine Design: Evaluation of Dynamic Loads on Large Offshore Wind Turbines 

      Frøyd, Lars (Doktoravhandlinger ved NTNU, 1503-8181; 2012:241, Doctoral thesis, 2012)
      A design method for combined aerodynamic and structural (aeroelastic) design of large wind turbine blades has been developed, with the purpose of facilitating conceptual design, parametric studies, optimisation, or cost ...

    • Wind Turbine Simulations with OpenFOAM 

      Hoem, Maria Enger (Master thesis, 2018)
      An actuator disk model is improved by including an impermeable hub and nacelle. This improves the wake flow a lot, but it turns out that the actuatorDiskExplicitForce model is mesh dependent. A mesh is made that provides ...

    • Wind Turbine Wake Interactions - The Influence of Shear on a Wind Turbine Wake 

      Jalil, Abdur Rahman (Master thesis, 2015)
      Full wake measurements have been performed on a model wind turbine at NTNU s wind tunnel to investigate the impact of shear flow compared to uniform flow on the wake flow. Mean and turbulent velocity measurements have been ...

    • Winglet optimization for a model-scale wind turbine 

      Hansen, Thomas Henrik Hertzfelder; Mühle, Franz Volker (Peer reviewed; Journal article, 2018)
      A winglet optimization method is developed and tested for a model-scale wind turbine. The best-performing winglet shape is obtained by constructing a Kriging surrogate model, which is refined using an infill criterion based ...

    • Wood burning habits and its effect on the electrical energy demand of a retrofitted Norwegian detached house 

      Felius, Laurina C; Thalfeldt, Martin; Georges, Laurent; Hrynyszyn, Bozena Dorota; Dessen, Fredrik; Hassan Mohamed, Mohamed Hamdy (Journal article; Peer reviewed, 2019)
      Using firewood as a space heating source is a popular solution in Norwegian housing and can significantly reduce the electrical energy demand of houses. This study analysed habits and reasons for using a wood stove from ...

    • Wood Pellets Utilized in the Commercial and Residential Sectors: - an in-depth study of selected barriers for increased use 

      Skjevrak, Geir (Doktoravhandlinger ved NTNU, 1503-8181; 2013:322, Doctoral thesis, 2013)
      Biomass is an important energy carrier since it is a renewable source and the energy content in the fuel can be stored over time and also generate high temperatures. Bioenergy can be in liquid form, gas-phase or solid. The ...

    • Wood stove material configurations for increased thermal comfort 

      Skreiberg, Øyvind; Georges, Laurent (Journal article; Peer reviewed, 2017)
      In this work, a numerical model of the heat transfer through composite wood stove walls has been used to study the effect of material configurations on the heat storage and the heat release profile to the room, to arrive ...

    • Wood-Pellet Heating in Norway: Early Adopters' Satisfaction and Problems That Have Been Experienced 

      Skjevrak, Geir; Sopha, Bertha Maya (Journal article; Peer reviewed, 2012)
      Given the vital role of early adopters during the early stage of wood-pellet heating development, this study aims to explore the factors that explain the overall satisfaction among the early adopters of this type of heating ...

    • Work and Heat Exchange Networks – Opportunities and Challenges 

      Yu, Haoshui; Fu, Chao; Gundersen, Truls (Journal article; Peer reviewed, 2018)
      Design and optimization of Heat Exchanger Networks (HENs) is well established and has been heavily applied in the process industries since its pioneering period in the 1970s and 1980s. While temperature and thermal energy ...

    • Work and Heat Integration: An emerging research area 

      Fu, Chao; Vikse, Matias; Gundersen, Truls (Journal article; Peer reviewed, 2018)
      The extension from Heat Integration (HI) and design of Heat Exchanger Networks (HENs) to including heating and cooling effects from pressure changing equipment has been referred to as Work and Heat Integration and design ...

    • Work and heat integration—A new field in process synthesis and process systems engineering 

      Yu, Haoshui; Fu, Chao; Vikse, Matias; Gundersen, Truls (Journal article; Peer reviewed, 2018)
      The extension from heat integration and design of heat exchanger networks (HENs) to including heating, cooling, and power effects from pressure changing equipment has been referred to as work and heat integration and design ...

    • Work Exchange Networks (WENs) and Work and Heat Exchange Networks (WHENs): A review of the current state of the art 

      Yu, Haoshui; Fu, Chao; Gundersen, Truls (Peer reviewed; Journal article, 2020)
      This paper provides a current state-of-the-art review of literature on work exchange networks (WENs) and work and heat exchange networks (WHENs). Heat exchange networks (HENs) and mass exchange networks (MENs) have been ...

    • Yaw-effekter på vindturbiner 

      Holten, Tom Håkon (Master thesis, 2010)
      En vindturbin med skjev innstrømning er behandlet ved hjelp av bladelementmetoden. Det har vist seg av metoden kan, ved hjelp av noen modifiseringer, også kan benyttes for å regne på vindturbiner med skjev innstrømning. ...