Blar i Publikasjoner fra CRIStin - NTNU på tidsskrift "Renewable Energy"
Viser treff 1-20 av 35
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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 ... -
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, ... -
From vague interest to strong intentions to install solar panels on private homes in the North – An analysis of psychological drivers
(Peer reviewed; Journal article, 2020)Solar panels have not seen the same widespread adoption in the Nordic countries as in the rest of Europe. The aim of the paper is to investigate how house owners that have already expressed some interest in solar panels ... -
Hydrothermal carbonization of olive wastes to produce renewable, binder-free pellets for use as metallurgical reducing agents
(Journal article, 2020)Torrefaction or hydrothermal carbonization processes were compared for conversion of olive pulp into metallurgical reducing agent. The dependence of yield, CO2 reactivity, and mechanical properties to reaction time and ... -
Identifying key design parameters of the integrated energy system for a residential Zero Emission Building in Norway
(Journal article; Peer reviewed, 2016)This study examined an integrated solution of the building energy supply system consisting of flat plate solar thermal collectors in combination with a ground-source heat pump and an exhaust air heat pump for the heating ...