Blar i Publikasjoner fra CRIStin - NTNU på tidsskrift "Renewable Energy"
Viser treff 1-20 av 45
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A comparison of extreme structural responses and fatigue damage of semi-submersible type floating horizontal and vertical axis wind turbines
(Journal article; Peer reviewed, 2017)Currently development of floating wind turbines for deep water is mainly based on horizontal axis wind turbines (HAWTs). However, floating vertical axis wind turbines (VAWTs) are possible alternative due to their potential ... -
A coupled modeling of design and investment parameters for optimal operation of methane bioreactors: Attainable region concept approach
(Journal article; Peer reviewed, 2020)Current practice to design methane bioreactors does not consider all degrees of freedom simultaneously, which raises question of global optimality. This study presents a model-based design framework, which simultaneously ... -
A fully coupled method for numerical modeling and dynamic analysis of floating vertical axis wind turbines
(Journal article; Peer reviewed, 2017)Offshore wind energy is one of the most promising renewable energy resources and an increasing interest arises to develop floating vertical axis wind turbines (VAWTs), which have the potential to reduce the cost of energy. ... -
A real-time energy management system for smart grid integrated photovoltaic generation with battery storage
(Journal article; Peer reviewed, 2019)This paper proposes a real-time energy management system (EMS) suitable for rooftop PV installations with battery storage. The EMS is connected to a smart grid where the price signals indirectly control the power output ... -
A comparative study of fully coupled and de-coupled methods on dynamic behaviour of floating wind turbine drivetrains
(Peer reviewed; Journal article, 2021)Traditionally, drivetrain responses are obtained by a de-coupled analysis, which first involves a global analysis with a simplified representation of the drivetrain, followed by a detailed analysis of the drivetrain with ... -
Comparison of the dynamic wake meandering model against large eddy simulation for horizontal and vertical steering of wind turbine wakes
(Peer reviewed; Journal article, 2023)Accurately predicting the evolution of wake is crucial for power output and structural load estimation in wind farms. This study aims to validate the dynamic wake meandering (DWM) model, an efficient mid-fidelity wake ... -
Cost-aware renewable energy management: Centralized vs. distributed generation
(Journal article; Peer reviewed, 2020)We propose optimization strategies for cooperating households equipped with renewable energy assets and storage devices. We consider two system configurations: In the first configuration, households share access to an ... -
Determination of kinetic constants from the co-digestion of dairy cow slurry and municipal food waste at increasing organic loading rates
(Journal article; Peer reviewed, 2017)The aim of this study was to investigate the performance and the kinetic constants of anaerobic mesophilic CSTR reactors run at increasing organic loading rates (OLR). The reactors were co-digesting dairy cow slurry (DCS) ... -
Distributed control scheme for residential battery energy storage units coupled with PV systems
(Journal article, 2017)A distributed control method for residential battery energy storage (BES) units coupled with photovoltaic (PV) systems is presented. The objective is to utilize customer owned BES units for solving the over-voltage issues ... -
Effect of the number of blades on the dynamics of floating straight-bladed vertical axis wind turbines
(Journal article; Peer reviewed, 2017)Floating vertical axis wind turbines (VAWTs) are promising solutions for exploiting the wind energy resource in deep waters due to their potential cost-of-energy reduction. The number of blades is one of the main concerns ... -
Effects of bedplate flexibility on drivetrain dynamics: Case study of a 10 MW spar type floating wind turbine
(Peer reviewed; Journal article, 2020)This paper deals with the effect of bedplate flexibility on drivetrain dynamics of a 10 MW spar type floating wind turbine. The 10 MW drivetrain bedplate is designed based on extreme design loads and ultimate limit state ... -
Energy cost models for air supported sports hall in cold climates considering energy efficiency
(Journal article; Peer reviewed, 2015)The aim of the study was to develop models for energy planning for an air supported sports hall by analyzing different energy efficiency possibilities. This is a very specific building type suitable for sport activities ... -
Energy optimization through cooperative storage management: A calculus of variations approach
(Peer reviewed; Journal article, 2021)A framework to optimize energy utilization through battery management in a cooperative environment is proposed. Participating households share access to a community-owned energy farm and are equipped with lossy rechargeable ... -
Energy performance analysis of a forced circulation solar water heating system equipped with a heat pipe evacuated tube collector under the Mediterranean climate cond
(Peer reviewed; Journal article, 2019)This work represents the energy performance analysis during the annual time period of a forced circulation solar water heating system equipped with a heat pipe evacuated tube collector having an aperture area of 1.476 m2 ... -
Experimental and numerical comparisons of hydrodynamic responses for a combined wind and wave energy converter concept under operational conditions
(Journal article; Peer reviewed, 2016)The spar torus combination (STC) concept is a combined wind and wave energy converter concept that is composed of a spar floating wind turbine and a torus-shaped, heaving-body wave energy converter (WEC). The WEC is installed ... -
Experimental and numerical investigation of nonlinear diffraction wave loads on a semi-submersible wind turbine
(Peer reviewed; Journal article, 2021)In a severe sea state, nonlinear wave loads can excite resonant responses of floating wind turbines either at high (structural) or low (rigid body motions) natural frequencies. In the present work, a computational fluid ... -
Experimental study of a Francis turbine under variable-speed and discharge conditions
(Journal article; Peer reviewed, 2018)This work investigates the unsteady pressure fluctuations in a hydraulic turbine that are observed during steep ramping. Although hydraulic turbines are expected to operate seamlessly during steep ramping, the resulting ... -
Experimental study of the functionality of a semisubmersible wind turbine combined with flap-type Wave Energy Converters
(Journal article; Peer reviewed, 2016)In the present paper the functionality of the Semisubmersible wind energy and Flap-type wave energy Converter (SFC) is examined experimentally. In order to study the functionality of the SFC, the focus is on operational ... -
Fault detection and diagnosis of a blade pitch system in a floating wind turbine based on Kalman filters and artificial neural networks
(Peer reviewed; Journal article, 2021)This paper describes the development of a fault detection and diagnosis method to automatically identify different fault conditions of a hydraulic blade pitch system in a spar-type floating wind turbine. For fault detection, ... -
Fault detection of offshore wind turbine drivetrains in different environmental conditions through optimal selection of vibration measurements
(Peer reviewed; Journal article, 2023)In this study, a vibration-based fault detection method is proposed for offshore wind turbine drivetrain based on the optimal selection of the acceleration measurements. The main aim is to find the sensor positions mounted ...