Browsing Institutt for energi og prosessteknikk by Title
Now showing items 3954-3973 of 4211
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An Ultra-Low Temperature Transcritical R744 Refrigeration System for Future Detectors at CERN LHC
(Peer reviewed; Journal article, 2021)The cooling systems of the future tracking detectors of the ATLAS and CMS experiments at the Large Hadron Collider (LHC) at CERN will be entirely based on CO2 refrigeration technology. The system is a booster refrigeration ... -
Ultra-Low-Temperature Refrigeration Systems: A Review and Performance Comparison of Refrigerants and Configurations
(Peer reviewed; Journal article, 2023)During the last decade, many industrial and medical applications have shown a requirement for low-temperature-cooling usage (from −40 to −80 °C), which cannot be efficiently obtained via the conventional refrigeration ... -
Uncertainty in multiphase flow estimates for a field development case
(Master thesis, 2013)Commercial multiphase flow simulators typically give one value for each output parameter simulated in a pipeline. Field development project managers want to know the uncertainty in these predictions in order to assess the ... -
Uncertainty of the allocation factors of heat and electricity production of combined cycle power plant
(Journal article; Peer reviewed, 2015)There are many different methods for the allocation of CO2 emissions in Combined Heat and Power plants. The choice of allocation method has a great effect on energy pricing and CO2 allocation in Combined Heat and Power ... -
Understanding Energy Conversion in Combustion
(Master thesis, 2021)I dette prosjektet har tre forskjellige modeller for flammer blitt undersøkt: forblandet velblandet reaktor, forblandet fritt-spredene flamme, og ikke-forblandet motstrøms flamme. Målet med prosjekter var å først bestemme ... -
Understanding GHG emissions from Swedish consumption - Current challenges in reaching the generational goal
(Journal article; Peer reviewed, 2019)The Swedish generational goal is a unique initiative governing all Swedish environmental policy, aiming at solving all major domestic environmental problems for the next generation without increasing environmental damage ... -
Understanding the consequences eradicating poverty and reducing world inequalities will have on the carbon-, material use- and land use footprints
(Master thesis, 2019)Menneskeskapte klimagassutslipp har de siste tiårene resultert i permanente skader på klimaet, noe som både vil påvirke denne og fremtidige generasjoner. Jordens gjennomsnittstemperatur har allerede steget med én grad siden ... -
Understanding the Effects of Power Ultrasound on the Hydrogen Evolution Reaction (HER) and the Oxygen Evolution Reaction (OER) on Polycrystalline Pt and Ni in Alkaline and Acidic Solutions
(Doctoral theses at NTNU;2022:172, Doctoral thesis, 2022)The aim of this Ph.D. project was to investigate the effect of power ultrasound on the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) on polycrystalline nickel (Ni) and platinum (Pt) in alkaline ... -
Understanding the Effects of Ultrasound (408 kHz) on the Hydrogen Evolution Reaction (HER) and the Oxygen Evolution Reaction (OER) on Raney-Ni in Alkaline Media
(Peer reviewed; Journal article, 2022)The hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) occurring at the Raney-Ni mesh electrode in 30 wt.-% aqueous KOH solution were studied in the absence (silent) and presence of ultrasound (408 ... -
Understanding the Environmental Implications of Energy Transitions. A Case Study for Wind Power
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:8, Doctoral thesis, 2013)A fundamental change in the ways in which we provide energy to run our economies, an energy transition, is needed to mitigate climate change. Wind power is an important part of future global energy supply in most energy ... -
Understanding the physical phenomena that occur inside heat exchanger for liquefactin of hydrogen
(Chapter, 2017)Liquid hydrogen is an attractive solution for long-range distribution. The largest barriers for implementing large-scale hydrogen liquefaction plants are currently their high energy consumption and cost. The heat exchangers ... -
Understanding the role of moisture recovery in indoor humidity: An analytical study for a Norwegian single-family house during heating season
(Journal article; Peer reviewed, 2022) -
Understanding the role of second life batteries in energy storage in Norway
(Master thesis, 2023)Denne oppgåva undersøker handteringa av brukte litium-ion batteri frå den norske elbilflåten. Etter kvart som transportsektoren vert dominert av elbilar blir det stadig viktigare å finne ut korleis ein best mogeleg kan ... -
Understanding the trends in Denmark's global food trade-related greenhouse gas and resource footprint
(Peer reviewed; Journal article, 2021)Food production is a major driver of global warming, water scarcity and biodiversity loss. Denmark has set ambitious targets to lower its territorial carbon emissions in the next decades. In 2019, the Danish Agriculture ... -
Understanding Transport Phenomena in Membrane Systems for Waste Utilisation: Electrodialysis Concepts for Waste Heat to Hydrogen and Lithium-Ion Battery Recycling
(Doctoral theses at NTNU;2024:230, Doctoral thesis, 2024) -
Undersøkelse av aktiv fortrengningsventilasjon for bruk i klasserom
(Master thesis, 2014)For å skape et best mulig læremiljø i skolen spiller inneklimaet i klasserommet en viktig rolle. I denne oppgaven er inneklima knyttet til termiske forhold som temperatur og trekk samt atmosfæriske forhold hvor luftkvalitet ... -
Undersøkelse av inneklimakvalitet i lagringsmagasinene på NTNU Gunnerus Biblioteket
(Master thesis, 2019)Hovedformålet med denne masteroppgaven var å undersøke og kartlegge inneklimaet til de historiske lagringsmagasinene til NTNU Gunnerus Biblioteket. Dette ble gjort gjennom overvåkning av de termo-hygrometriske parameterne; ... -
Undersøkelse av NVF 2020 relatert til vannkraftverk
(Master thesis, 2020)Statnett reviderer dokumentet som definerer funksjonskravene for turbinregulatorer i norske vannkraftverk. Revisjonen er en del av en større europeisk reform med hensikt å løse frekvensproblemer i det nordiske synkronnettet. ... -
Undersøkelse av småturbin
(Master thesis, 2012)I denne oppgaven har en Kaplan turbin produsert i Afghanistan blitt undersøkt. En fullstendig virkningsgradanalyse er gjort i laboratoriet, på to av fire løpehjulsvinkler. Like før innløpet til turbinen er det et 90 grader ... -
Undersøkelse av ustasjonære og turbulente forhold i minirigg ved hjelp av LDV, trykkmålinger og CFD
(Master thesis, 2009)Diplomoppgava fortsetter arbeidet som blei starta i prosjektoppgava høsten 2008. Det er utført laboratorieforsøk på en minirigg der spinn settes opp i et vertikalt rør. Nedstrøms kan vann injiseres tangentielt gjennom ei ...