Blar i HVL Open på tidsskrift "Energies"
Viser treff 1-20 av 27
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A Common Risk Classification Concept for Safety Related Gas Leaks and Fugitive Emissions?
(Journal article; Peer reviewed, 2019)Gas leaks in the oil and gas industry represent a safety risk as they, if ignited, may result in severe fires and/or explosions. Unignited, they have environmental impacts. This is particularly the case for methane leaks ... -
A New Approach to Include Complex Grounding System in Lightning Transient Studies and EMI Evaluations
(Journal article; Peer reviewed, 2019)A new approach to lightning transient studies including complex grounding grids is presented in this paper. The grounding system is modeled in Matlab/Simulink based on the transmission line theory. Using a bottom-up approach ... -
Analysis of a Costly Fiberglass-Polyester Air Filter Fire
(Journal article; Peer reviewed, 2022)In September 2020, a fire at a liquefied natural gas (LNG) plant in the Arctic areas of Norway received national attention. In an unengaged air intake, the heat exchanger designed to prevent ice damage during production ... -
Analysis of a High‐Voltage Room Quasi‐Smoke Gas Explosion
(Peer reviewed; Journal article, 2020)During an air separation unit shut-down in a methanol production plant, a stop signal was sent to the control cabinet of a synchronous motor for a booster compressor. The control cabinet stopped magnetizing the rotor, while ... -
Analysis of Expected Skin Burns from Accepted Process Flare Heat Radiation Levels to Public Passersby
(Peer reviewed; Journal article, 2021)Hot flaring, even from quite high flare stacks, may result in significant heat radiation outside a facility to, e.g., public roads where random passersby may be exposed. The present study suggests a novel method for analyzing ... -
Analyzing COVID-19 Impacts on Vehicle Travels and Daily Nitrogen Dioxide (NO2) Levels among Florida Counties
(Journal article; Peer reviewed, 2020)The COVID-19 outbreak and ensuing social distancing behaviors resulted in substantial reduction on traffic, making this a unique experiment on observing the air quality. Such an experiment is also supplemental to the smart ... -
Bundle Extreme Learning Machine for Power Quality Analysis in Transmission Networks
(Journal article; Peer reviewed, 2019)This paper presents a novel method for online power quality data analysis in transmission networks using a machine learning-based classifier. The proposed classifier has a bundle structure based on the enhanced version of ... -
Collective Action and Social Innovation in the Energy Sector: A Mobilization Model Perspective
(Journal article; Peer reviewed, 2020)This conceptual paper applies a mobilization model to Collective Action Initiatives (CAIs) in the energy sector. The goal is to synthesize aspects of sustainable transition theories with social movement theory to gain ... -
A concept of risk prioritization in FMEA analysis for fluid power systems
(Peer reviewed; Journal article, 2021)FMEA analysis is a tool of quality improvement that has been widely used for decades. Its classical version prioritizes risk of failure by risk priority number (RPN). The RPN is a product of severity (S), occurrence (O), ... -
The Contribution of Energy Communities to the Upscaling of Photovoltaics in Germany and Italy
(Peer reviewed; Journal article, 2021)Energy communities (EC) are among the new actors in the energy market, playing an important role in the uptake of photovoltaics (PV) in European markets. This paper estimates their aggregate contribution to the low-carbon ... -
The Development of Citizen-Installed Renewable Energy Capacities in Former Eastern Bloc Countries—The Case of Poland
(Peer reviewed; Journal article, 2022)We confront empirical data on citizen-led renewable energy capacities in Poland with results obtained from a meta-theoretical, empirical analysis of the national energy system. We elicit and rank essential disabling and ... -
Experimental and Numerical Investigation of Extinguishing Effectiveness of Inert-Gas Agents in a Leaky Enclosure
(Peer reviewed; Journal article, 2022)Gas-fire-suppression systems are currently applied to some specific buildings in Norway, as sprinkler systems may not provide sufficient protection in some cases. The application of inert-gas-fire-suppression systems for ... -
FAIR Metadata Standards for Low Carbon Energy Research—A Review of Practices and How to Advance
(Peer reviewed; Journal article, 2021)The principles of Findability, Accessibility, Interoperability, and Reusability (FAIR) have been put forward to guide optimal sharing of data. The potential for industrial and social innovation is vast. Domain-specific ... -
Field study on the thermal performance of vacuum tube solar collectors in the climate conditions of Western Norway
(Peer reviewed; Journal article, 2021)A significant part of energy consumption in Northern countries goes to heating. There is no consensus about the most efficient source of renewable heat there. This paper presents a field study for a 7.8 m2 vacuum tube solar ... -
Growth and economic performance of the Norwegian wind power industry and some aspects of the Nordic electricity market
(Peer reviewed; Journal article, 2021)Electricity has been produced in Norway in hydropower plants since 1877. The first wind power plant was put into operation in 1986. The growth in wind power production was weak in the first years after the turn of the ... -
Hybrid Density Functional Study of Au2Cs2I6, Ag2GeBaS4, Ag2ZnSnS4, and AgCuPO4 for the Intermediate Band Solar Cells
(Journal article; Peer reviewed, 2018)We present a comprehensive investigation of the structural, electronic, mechanical, and optical properties of four promising candidates, namely Au2Cs2I6, Ag2GeBaS4, Ag2ZnSnS4, and AgCuPO4, for application in photovoltaic ... -
Hybrid Nanofluid in a Direct Absorption Solar Collector: Magnetite vs. Carbon Nanotubes Compete for Thermal Performance
(Peer reviewed; Journal article, 2022)The paper presents the experimental measurements of thermal efficiency of a tubular direct absorption solar collector (DASC) with a hybrid nanofluid based on magnetite (Fe3O4) and multi-walled carbon nanotubes (MWCNT). The ... -
Influence of Acetone and Sodium Chloride Additives on Cooling Efficiency of Water Droplets Impinging onto Hot Metal Surfaces
(Journal article; Peer reviewed, 2019)In the present work, the cooling efficiency of water droplets falling onto hot aluminum and stainless steel discs from heights of 12.5 cm, 25 cm, 50 cm and 100 cm, corresponding to speeds of 1.5 m/s, 2.2 m/s, 3.1 m/s and ... -
A Matrix FMEA Analysis of Variable Delivery Vane Pumps
(Peer reviewed; Journal article, 2021)Hydraulic systems are widely used in the aeronautic, machinery, and energy industries. The functions that these systems perform require high reliability, which can be achieved by examining the causes of possible defects ... -
Modeling Water Droplet Freezing and Collision with a Solid Surface
(Journal article; Peer reviewed, 2021)Water droplets released from the sea surface represent one of the major causes of ice accretion on marine vessels. A one-dimensional model of the freezing of a spherical water droplet moving in cold air was developed. The ...