Browsing Publikasjoner fra CRIStin - SINTEF Energi by Issue Date
Now showing items 1001-1020 of 1632
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Solar heat recovery system using CO2 as working fluid
(Science et technique du froid;, Chapter, 2020)This article proposes a solar water heater system induced by natural convective flow using supercritical CO2 as a working fluid. The proposed solar water heater can produce thermal energy as hot water from solar thermal ... -
Field data of CO2 integrated refrigeration, heating and cooling systems for supermarkets
(Science et technique du froid;, Chapter, 2020)The EU H2020 project MultiPACK has given the opportunity of installing three state-of-the art CO2 systems for supermarkets in South Europe, able to supply all the required thermal energy needs of the site, i.e. refrigeration, ... -
Non-equilibrium approach in simulations of the R744 flow through the motive nozzle of the two-phase ejector
(Science et technique du froid;, Chapter, 2020)The ejector technology for R744 systems was continuously improved over the last two decades in the area of control and design processes. The latter should be related with a significant interest on modelling approaches ... -
Nonconvex Environmental Constraints in Hydropower Scheduling
(Chapter, 2020)Environmental constraints in hydropower systems serve to ensure sustainable use of water resources. Through accurate treatment in hydropower scheduling, one seeks to respect such constraints in the planning phase while ... -
Comparative Study of Event Prediction in Power Grids using Supervised Machine Learning Methods
(Chapter; Peer reviewed, 2020)There is a growing interest in applying machine learning methods on large amounts of data to solve complex problems, such as prediction of events and disturbances in the power system. This paper is a comparative study of ... -
Prebreakdown phenomena in hydrocarbon liquids in a point-plane gap under step voltage. Part 1: behaviour at positive polarity
(Journal article; Peer reviewed, 2020)This study addresses the dielectric performance of nonpolar hydrocarbon liquids and mineral oils under positive polarity stress. It is of interest to improve knowledge on how functional properties of dielectric liquids ... -
Framework and methodology for active distribution grid planning in Norway
(Chapter, 2020)The long-term planning frameworks currently used by electricity distribution grid companies are not designed to account for new challenges such as variable distributed generation or for new opportunities of active grid ... -
Integration of heat pumps with natural working fluids into a neighborhood energy system
(Sciences et technique du froid;2020:14, Chapter; Peer reviewed, 2020)Combining heat pumps (HP) with other renewables, e.g. solar thermal collectors, photovoltaics and energy storage systems can contribute to the growth of future zero emission societies. This article investigates HP integration ... -
Arc Voltage Distribution Measurement in Tube Constricted Ultrahigh-Pressure Nitrogen Arc
(Lecture Notes in Electrical Engineering;599, Chapter; Peer reviewed, 2020)This work contributes to the fundamental understanding of axial voltage distribution of the arc burning inside polytetrafluoroethylene (PTFE) tube at very high filling pressures of nitrogen. The arc peak current of 85 A ... -
Dissecting the exergy balance of a hydrogen liquefier: Analysis of a scaled-up claude hydrogen liquefier with mixed refrigerant pre-cooling
(Peer reviewed; Journal article, 2020)For liquid hydrogen (LH2) to become an energy carrier in energy commodity markets at scales comparable to for instance LNG, liquefier capacities must be scaled up several orders of magnitude. While state-of-the-art liquefiers ... -
Exploring household's flexibility of smart shifting atomic loads to improve power grid operation and cost efficiency
(International Conference on the European Energy Market;2020, Chapter; Peer reviewed, 2020)This paper explores the possibilities of shifting certain household consumer-based loads in time, to reduce unnecessary load peaks to the grid which again can cause challenges for Distribution System Operators (DSOs). ... -
The dynamics of solar prosuming: Exploring interconnections between actor groups in Norway
(Peer reviewed; Journal article, 2020)Solar prosuming is an emerging phenomenon in which many actor groups are involved in shaping new solutions. Here we study national policymakers, relevant stakeholders such as grid companies, and the prosumers themselves – ... -
Passivity Enforcement by Residue Perturbation via Constrained Non-Negative Least Squares
(Peer reviewed; Journal article, 2020)Passivity is a fundamental requirement for rational models to guarantee stable behavior when included in general time domain simulations. This paper introduces a new variant of one passivity enforcement scheme that is based ... -
A Current Controlled Virtual Synchronous Machine Adapted for Operation under Unbalanced Conditions
(International Conference on Renewable Energy Research and Applications;9, Chapter; Peer reviewed, 2020)This paper presents a comprehensive evaluation of control strategies for operation of a Virtual Synchronous Machine (VSM) under unbalanced conditions in both grid-connected and islanded mode. The basis for the evaluation ... -
The importance of thermodynamic insight in Work and Heat Exchange Network Design
(Peer reviewed; Journal article, 2020)Work and Heat Exchange Network (WHEN) design has been an emerging topic in the area of Process Synthesis and has attracted increasing research interest in the past few years. Not only temperature changes but also pressure ... -
A graph-based modelling framework for vulnerability analysis of critical sequences of events in power systems
(Journal article; Peer reviewed, 2020)Major blackouts may have critical societal consequences and are very challenging to analyse and mitigate. Part of the challenge lies in the complex sequences of events that characterize such blackouts and that involve a ... -
Status of waste-to-energy in Germany, Part I ? Waste treatment facilities
(Peer reviewed; Journal article, 2020)This study gives a detailed overview over the German waste-to-energy sector in 2015. The aim is to quantify the available treatment capacities and the energetic potential of waste in Germany. The work is based on an extensive ... -
Configuration and model order selection of frequency-dependent π-models for representing dc-cables in small-signal eigenvalue analysis of HVDC transmission systems
(Peer reviewed; Journal article, 2020)Eigenvalue-based analysis of small-signal dynamics in High Voltage Direct Current (HVDC) transmission systems requires cable models that are compatible with a state-space representation. While distributed parameter models ... -
Assessment of flexibility in different ancillary services for the power system
(International Conference on the European Energy Market;2020, Chapter; Peer reviewed, 2020)To handle the changing power system and enable the energy transformation, several actions are needed, where the increase of digitalization, automation and more substantial production variability implies a need for flexibility. ... -
Work Exchange Networks (WENs) and Work and Heat Exchange Networks (WHENs): A review of the current state of the art
(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 ...