Blar i Fakultet for ingeniørvitenskap (IV) på tidsskrift "Energy Procedia"
Viser treff 41-60 av 131
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Diagnostic monitoring of drivetrain in a 5 MW spar-type floating wind turbine using Hilbert spectral analysis
(Journal article; Peer reviewed, 2017)The objective of this paper is to investigate the frequency-based fault detection of a 5MW spar-type floating wind turbine (WT) gearbox using measurements of the global responses. It is extremely costly to seed managed ... -
Dynamic Analysis of a Braceless Semisubmersible Offshore Wind Turbine in Operational Conditions
(Peer reviewed; Journal article, 2015)The development of cost effective floating type offshore wind turbines has been desired in deep sea areas. Semisubmersible platform can be considered as a very efficient design configuration among the different type ... -
Dynamic analysis of a floating vertical axis wind turbine under emergency shutdown using hydrodynamic brake
(Journal article; Peer reviewed, 2014)Emergency shutdown is always a challenge for an operating vertical axis wind turbine. A 5-MW vertical axis wind turbine with a Darrieus rotor mounted on a semi-submersible support structure was examined in this study. ... -
Dynamic analysis of floating wind turbines during pitch actuator fault, grid loss, and shutdown
(Journal article; Peer reviewed, 2013)Coupled non-linear aero-hydro-servo-elastic simulations of three types of floating wind turbines (spar, semi- submersible, and tension leg platform) are carried out for several fault cases over a range of environmental ... -
Dynamic Process Model Development and Validation with Transient Plant Data Collected from an MEA Test Campaign at the CO2 Technology Center Mongstad
(Journal article; Peer reviewed, 2017)This work focuses on the development and validation of a dynamic process model of the post-combustion CO2 chemical absorption process with temperature swing absorption (TSA) using aqueous monoethanolamine (MEA) as solvent. ... -
Editorial to the Proceedings of NSB2017
(Journal article; Peer reviewed, 2017) -
Effect of Load Sequence and Weather Seasonality on Fatigue Crack Growth for Monopile-based Offshore Wind Turbines
(Journal article; Peer reviewed, 2016)Offshore wind turbines are subjected to variable amplitude loading, but the impact of load sequence is commonly neglected in fatigue analysis. This paper presents an initial investigation if load sequence and weather ... -
Effect of Temperature and Duration of Torrefaction on the Thermal Behavior of Stem Wood, Bark, and Stump of Spruce
(Journal article; Peer reviewed, 2017)In this work the torrefaction of different parts of Norway spruce (stem wood, bark, and stump) was studied. Three different torrefaction temperatures were applied: 225, 275, and 300 °C with 30 and 60 minutes isothermal ... -
Experimental Investigations of Impurity Impact on CO2 Mixture Phase Equilibria
(Journal article; Peer reviewed, 2014)A facility designed for precise measurements of phase equilibria of CO2-rich mixtures relevant for CCS conditioning and transport is demonstrated. The setup aims for high accuracy in pressure, temperature, and composition ... -
Experimental study on power curtailment of three in-line turbines
(Journal article; Peer reviewed, 2017)A dataset of wind tunnel power and wake flow measurements on a setup of three aligned model wind turbines is presented. The power outputs of the three turbines are in good agreement with measurements from a full-scale wind ... -
Experimental validation of a time-domain approach for determining sectional loads in a floating wind turbine hull subjected to moderate waves
(Journal article; Peer reviewed, 2017)To achieve cost-effective and reliable structural design of floating wind turbines, efficient and accurate time domain numerical approaches are required to analyse structural responses in design conditions, e.g. wind and ... -
Experimental Verification of CO2 Dissolution Rate Due to Diffusion Induced Convection
(Journal article; Peer reviewed, 2017)An experimental setup has been designed for measuring the dissolution rate of buoyant CO2 into the water phase below. Experiments were performed in a high-pressure cell, where the water phase was stabilized by a porous ... -
Exploring the CO2-Impact for Building Height; A Study on Technical Building Installations
(Journal article; Peer reviewed, 2016)Building tall typically requires a different operational energy demand and additional material. The purpose of this article is to analyze the adaption of technical systems to increased building height with particular ... -
Fast hydrothermal liquefaction of native and torrefied wood
(Journal article; Peer reviewed, 2017)The work presented in this paper aimed to examine the effect of heating rate on the bio-crude yield of wood hydrothermal liquefaction. Three different heating methods were developed, resulting in heating rates ranging from ... -
Fatigue crack detection for lifetime extension of monopile-based offshore wind turbines
(Journal article; Peer reviewed, 2017)Lifetime extension becomes increasingly crucial for industry, since the first offshore wind farms face the end of their design lifetime. The remaining useful lifetime of offshore foundations is driven by fatigue design and ... -
Fatigue Reliability-Based Inspection and Maintenance Planning of Gearbox Components in Wind Turbine Drivetrains
(Journal article; Peer reviewed, 2014)This paper introduces a reliability-based maintenance plan for wind turbine gearbox components. The gears and bearings are graded based on their fatigue damage and a maintenance map is developed to focus on those components ... -
Feasibility Study of Novel Integrated Aerogel Solutions
(Journal article; Peer reviewed, 2017)The market share for fibre reinforced aerogel insulation materials is expected to increase as production costs are lowered, and in this context, the development of layered products with integrated aerogel is highly ... -
Flexible Operation of an IGCC Plant Coproducing Power and H2 with CO2 Capture through Novel PSA-based Process Configurations
(Journal article; Peer reviewed, 2017)The coproduction of power and H2 in an integrated gasification combined cycle (IGCC) plant with CO2 capture demonstrated to entail interesting potentials in terms of flexible operations. The possibility to shift between ... -
Flow pattern transitions in and hysteresis effects of falling film flow over horizontal tubes related to LNG heat exchangers
(Journal article; Peer reviewed, 2015)Spiral wound heat exchangers with horizontal tube configurations are used extensively in the chemical, refrigeration, petroleum and food industry, and are core components in many natural gas liquefaction plants. For improved ... -
Fluid selection and thermodynamic optimization of organic Rankine cycles for waste heat recovery applications
(Journal article; Peer reviewed, 2017)Organic Rankine cycles are effective to convert waste heat to power. One of the advantages and challenges of these cycles is that the most suitable working fluid and cycle configuration have to be selected for every ...