Blar i Institutt for energi og prosessteknikk på tittel
Viser treff 4040-4059 av 4147
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Verifisering av kostnadsbesparelser oppnådd ved bruk av kunstig intelligens for optimalisert regulering av oppvarming ved Halsan skole
(Master thesis, 2023)I begynnelsen av 2019 ble Halsan barneskole i Levanger kommune oppgradert med nye ventilasjons-, varme- og lysanlegg. Som en del av oppgraderingsprosjektet ble det implementert et optimaliseringssystem for regulering av ... -
Versatile Simulation Method for Complex Single Mixed Refrigerant Natural Gas Liquefaction Processes
(Peer reviewed; Journal article, 2018)Natural gas liquefaction is an energy intensive process with very small driving forces particularly in the low temperature region. Small temperature differences in the heat exchangers and high operating and capital costs ... -
Vertical Stratification in a Ventilated Space: Comparison of Theoretical Predictions to Experimental Results from a Water Scale Model
(Master thesis, 2007)This study investigates the behaviour of a vertically distributed source of buoyancy on the vertical stratification in a ventilated space, an important factor for determining indoor comfort when using displacement ventilation. ... -
Vertical Wind Profiles in Non-Neutral Conditions: Comparison of Models and Measurements From Frøya
(Journal article; Peer reviewed, 2018)This paper presents an analysis of stratification dependent mean velocity profiles measured in a Norwegian coastal wind climate, and its comparison with models available in the literature. For this purpose we use 3 years ... -
Videreutvikling av massebalanse-modell for LNG-anlegg
(Master thesis, 2008)Det ble utviklet en massebalansemodell for Hammerfest LNG-anlegg som var enkel nok til å implementeres i et regneark. Modellen skulle være i stand til å estimere komposisjon og rate på produktene. Resultatene fra den ... -
Virkningsgrads- og trykkpulsasjonsmålinger ved lavtrykks vannkraftverk
(Master thesis, 2015)Av alle måter å produserer elektrisk kraft på, både fornybare og ikke-fornybare, er vannkraft den som lettest lar seg regulere. Mens vind- og solkraft kun produserer kraft når vind og sol er til stede og kraftverk som går ... -
Virkningsgradsmåling av vannturbiner
(Master thesis, 2011)Målet for prosjektet var å finne virkningsgradkurve for en turbin ved hjelp av Winter-Kennedy målinger og CFD-analyser. Det ble derfor laget en CAD-modell av gjennomstrømningsvolumet i spiraltromma på NTNUs vannkraftlaboratorium ... -
Virkningsgradsmålinger av Peltonturbin med termodynamisk målemetode ved Grunnåi kraftverk
(Master thesis, 2022)Virkningsgraden beskriver en vannkraftturbins tilstand og ytelse, og det er viktig for både eiere og leverandører at denne kan måles så nøyaktig som mulig. Masteroppgaven omhandler virkningsgradsmålinger for Pelton turbiner ... -
Virtual carbon and water flows embodied in global fashion trade - a case study of denim products
(Peer reviewed; Journal article, 2021)The environmental impacts of the fashion industry have been aroused wide concerns. The globalization and fragmentation of the textile and fashion system have led to the uneven distribution of environmental consequences. ... -
Virvelavløsning fra butte objekter i en kanalstrømning
(Master thesis, 2012)I denne hovedoppgaven har slippstrømninger generert av sirkulære sylindre og to typer elliptiske varmeveksler - rør blitt undersøkt. Målet med arbeidet har vært å beskrive virvelavløsningsfenomener på elliptiske varmeveksler ... -
Viscosity in modified gravity
(Journal article; Peer reviewed, 2012)A bulk viscosity is introduced in the formalism of modified gravity. It is shown that, based on a natural scaling law for the viscosity, a simple solution can be found for quantities such as the Hubble parameter and the ... -
Viscosity-Induced Crossing of the Phantom Barrier
(Journal article; Peer reviewed, 2015)We show explicitly, by using astrophysical data plus reasonable assumptions for the bulk viscosity in the cosmic fluid, how the magnitude of this viscosity may be high enough to drive the fluid from its position in the ... -
Viscosity-induced crossing of the phantom divide in the dark cosmic fluid
(Journal article; Peer reviewed, 2013-12-10)Choosing various natural forms for the equation-of-state parameter w and the bulk viscosity ζ, we discuss how it is possible for a dark energy fluid to slide from the quintessence region across the divide w = −1 into the ... -
Viscous Cosmology for Early- and Late-Time Universe
(Journal article; Peer reviewed, 2017)From a hydrodynamicist’s point of view the inclusion of viscosity concepts in the macroscopic theory of the cosmic fluid would appear most natural, as an ideal fluid is after all an abstraction (exluding special cases such ... -
Viscous coupled fluids in terms of a log-corrected equation-of-state
(Peer reviewed; Journal article, 2021)In this paper, we consider a class of cosmological fluids that possess properties analogous to those of crystalline solids undergoing isotropic deformations. Our research is based on a modified log-corrected power-law ... -
Visualisation of zero-emission neighbourhood for architects and the application to Nidarvoll Skole in Trondheim
(Master thesis, 2019)Building, transportation, and human activities are main sources to generate greenhouse gas (GHG) emissions in neighbourhood. In order to reduce GHG emissions in neighbourhoods, architects plays an important role particularly ... -
Visualization of condensation over micro-structured surfaces
(Master thesis, 2016)Water condensation is an ubiquitous phenomenon that happens widely in nature. It is also used in industrial applications such as water harvesting, desalination systems, thermal management and power generation. Filmwise ... -
Volatile Organic Components Adsorption on Activated Carbon
(Master thesis, 2022)Some volatile organic components may cause serious human health and environmental threats. These components are "global warming agents" that contribute to climate change. While the negative impact of methane and carbon ... -
Vortex dislocation mechanisms in the near wake of a step cylinder
(Peer reviewed; Journal article, 2020)Vortex interactions behind step cylinders with diameter ratio D/d = 2 and 2.4 at Reynolds number ( ReD ) 150 were investigated by directly solving the three-dimensional Navier–Stokes equations. In accordance with previous ... -
Vortex dynamics of a jet at the pressure node in a standing wave
(Journal article; Peer reviewed, 2020)In this paper we investigate the vortex structure and dynamics formed in the near field of a turbulent axisymmetric jet subjected to transverse acoustic forcing. Full three-dimensional phase-averaged velocity measurements ...