Blar i Fakultet for ingeniørvitenskap (IV) på tidsskrift "Energies"
Viser treff 81-100 av 163
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Leakage Vortex Progression through a Guide Vane’s Clearance Gap and the Resulting Pressure Fluctuation in a Francis Turbine
(Peer reviewed; Journal article, 2021)A clearance gap (CG) between guide vanes (GVs) and facing plates exists at both ends of a Francis turbine and allows the opening angle to be adjusted for varying operating conditions. Leakage flow is induced through this ... -
Lessons learned from an experimental campaign on promoting energy content of renewable biogas by injecting H2 during anaerobic digestion
(Peer reviewed; Journal article, 2020)Direct injection of H2 to an anaerobic reactor enables biological fixation of CO2 into CH4 (biomethanation) and consequently boosts methane content in the produced biogas. However, there has been only a small amount of ... -
Life Cycle Assessment of Various PMSG-Based Drivetrain Concepts for 15 MW Offshore Wind Turbines Application
(Peer reviewed; Journal article, 2023)There are different configurations selected by both industry and academia as the drivetrain for wind turbines in the power range of 10 to 16 MW. The choice of drivetrain system influences the levelized cost of energy, and, ... -
Life Cycle Based Climate Emissions of Charcoal Conditioning Routes for the Use in the Ferro-Alloy Production
(Peer reviewed; Journal article, 2022)Renewable reductants are intended to significantly reduce CO2 emissions from ferro-alloy production, e.g., by up to 80% in 2050 in Norway. However, charcoals provide inferior properties compared to fossil fuel-based ... -
Lifetime Assessment of Combined Cycles for Cogeneration of Power and Heat in Offshore Oil and Gas Installations
(Journal article; Peer reviewed, 2017)The utilization of combined cycles for offshore cogeneration of power and heat is an attractive option to reduce the CO2 emissions directly related to the oil and gas sector. Main challenges for their efficient implementation ... -
Liquid Hydrogen Spills on Water—Risk and Consequences of Rapid Phase Transition
(Peer reviewed; Journal article, 2021)Liquid hydrogen (LH2 ) spills share many of the characteristics of liquefied natural gas (LNG) spills. LNG spills on water sometimes result in localized vapor explosions known as rapid phase transitions (RPTs), and are a ... -
Lithium-Ion Capacitors: A Review of Design and Active Materials
(Peer reviewed; Journal article, 2021)Lithium-ion capacitors (LICs) have gained significant attention in recent years for their increased energy density without altering their power density. LICs achieve higher capacitance than traditional supercapacitors due ... -
Local Heating Networks with Waste Heat Utilization: Low or Medium Temperature Supply?
(Peer reviewed; Journal article, 2020)District heating enables an economical use of energy sources that would otherwise be wasted to cover the heating demands of buildings in urban areas. For efficient utilization of local waste heat and renewable heat sources, ... -
Long-term thermal performance of group of energy piles in unsaturated soils under cyclic thermal loading
(Peer reviewed; Journal article, 2021)Geothermal energy piles (GEPs) are an environmentally friendly heat exchange technology that dualizes the role of the structural foundation pile for load support and in meeting the building heating/cooling need. Energy ... -
Machine learning: A useful tool in geomechanical studies, a case study from an offshore gas field
(Peer reviewed; Journal article, 2020)For a safe drilling operation with the of minimum borehole instability challenges, building a mechanical earth model (MEM) has proven to be extremely valuable. However, the natural complexity of reservoirs along with the ... -
Machine-Learning-Based Prediction of HVAC-Driven Load Flexibility in Warehouses
(Peer reviewed; Journal article, 2023)This paper introduces a methodology for predicting a warehouse’s reduced load while offering flexibility. Physics-based energy simulations are first performed to model flexibility events, which involve adjusting cooling ... -
Managing Heterogeneous Datasets for Dynamic Risk Analysis of Large-Scale Infrastructures
(Peer reviewed; Journal article, 2022)Risk assessment and management are some of the major tasks of urban power-grid management. The growing amount of data from, e.g., prediction systems, sensors, and satellites has enabled access to numerous datasets originating ... -
Measuring the dynamic characteristics of a low specific speed pump-Turbine model
(Journal article; Peer reviewed, 2016)This paper presents results from an experiment performed to obtain the dynamic characteristics of a reversible pump-turbine model. The characteristics were measured in an open loop system where the turbine initially was ... -
Mechanistic Model of an Air Cushion Surge Tank for Hydro Power Plants
(Journal article; Peer reviewed, 2022) -
Minimum leading edge protection application length to combat rain-induced erosion of wind turbine blades
(Peer reviewed; Journal article, 2021)Leading edge erosion (LEE) repairs of wind turbine blades (WTBs) involve infield application of leading edge protection (LEP) solutions. The industry is currently aiming to use factory based LEP coatings that can applied ... -
Modeling of a CO2‐Based Integrated Refrigeration System for Supermarkets
(Peer reviewed; Journal article, 2021)An integrated energy system that consists of a centralized refrigeration unit can deliver the entire HVAC&R (heating, ventilation, air conditioning, and refrigeration) demand for a supermarket. CO2 (R744) is a natural ... -
Moving toward a Sustainable Energy System: A Case Study of Viken County of Norway
(Peer reviewed; Journal article, 2020)Increasing awareness of climate issues and environmental policy has been a key factor behind the continuous transition of energy systems at different levels. This paper aimed to analyse the energy system of Viken county, ... -
Multi-criteria studies and assessment supporting the selection of locations and technologies used in co2-egs systems
(Peer reviewed; Journal article, 2021)The paper describes application of the cross-impact method in the process of selecting locations and technologies used in a geothermal system based on energy accumulated in a dry rock formation, where CO2 is used as the ... -
Multi-Ejector Concept: A Comprehensive Review on its Latest Technological Developments
(Journal article; Peer reviewed, 2019)The adoption of the EU F-Gas Regulation 517/2014 and the resulting development of the multi-ejector concept have led carbon dioxide to take center stage as the sole refrigerant (R744) in several applications. Therefore, a ... -
Multi-Objective Optimization of Building Energy Design to Reconcile Collective and Private Perspectives: CO2-eq vs. Discounted Payback Time
(Journal article; Peer reviewed, 2017)Building energy design is a multi-objective optimization problem where collective and private perspectives conflict each other. For instance, whereas the collectivity pursues the minimization of environmental impact, the ...