Browsing Institutt for energi og prosessteknikk by Title
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Investigation of integrated CO2 heat pumping systems for hotels in cold climates
(Doctoral theses at NTNU;2021:391, Doctoral thesis, 2021) -
Investigation of Model Predictive Control Application in District Heating Systems with Distributed Sources
(Doctoral theses at NTNU;2022:273, Doctoral thesis, 2022)District heating (DH) systems, which can integrate various available heat sources, have proven to be an energy-efficient and environment-friendly way to satisfy buildings’ heating demands. However, with the transition from ... -
Investigation of non-equilibrium effects during the depressurization of carbon dioxide
(Chapter, 2022)Predicting the phase change of liquid CO2 during depressurization is highly relevant for the application in refrigeration units and for safety analysis in the context of CO2 capture and storage (CCS). For abrupt depressurization ... -
Investigation of on-set of trailing edge cavitation in a Francis runner - Undersøkelse av dannelse av kavitasjon på avløpskanten til et Francis løpehjul
(Master thesis, 2018)Numerical simulations has been run on the Francis99 model runner at full load and deep part load conditions. Simulations has also been performed on plant Thoma number for for varying discharge. The simulations were performed ... -
Investigation of Pressure Release Systems for CO2
(Master thesis, 2015)A pressure release system for CO2 is designed to release CO2 from a system where the pressure is higher than a predetermined maximum pressure. Precautions has to be taken when designing a pressure release system for CO2 ... -
Investigation of R744 refrigeration system for supermarkets and the possibility of integrating a cold thermal energy storage
(Master thesis, 2021)Denne rapporten oppsummerer arbeidet som er gjort for masteroppgaven våren 2021. Rapporten er en videreføring av forprosjektet skrevet høsten 2020. Temaet for rapporten er CO2-kjølesystemer for supermarkeder og muligheten ... -
Investigation of Rate Capability and Mass Transfer Dynamics in Lithium-ion Batteries
(Master thesis, 2023)Det forventes at litiumionebatterier kommer til å ha en betydelig stor del av å oppnå netto nullutslippet under den grønne omstillingen verden i dag står ovenfor. Det er nødvendig å utforske nye og mer bærekraftige ... -
Investigation of rate capacity retention and mass transport properties of structured cathodes in lithium-ion batteries
(Master thesis, 2024)Litium-ion-batterier blir stadig viktigere etter hvert som etterspørselen etter energi vokser under den grønne omstillingen. Forståelse av batterier og sine begrensninger med hensyn til spesifikk energitetthet og hvordan ... -
Investigation of seal technology for Francis turbine
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:50, Doctoral thesis, 2012)Leakage loss and disk friction loss caused by the clearance gap flow at the back of a runner have a major impact on the efficiency of hydraulic turbines. Accordingly, it is extremely important to develop and improve the ... -
Investigation of sediment erosion phenomenon for different blade angle distribution in Francis runner
(Peer reviewed; Journal article, 2021)Wear and tear of hydraulic turbine due to sediment erosion is one of the major problems in hydropower plants located in the Himalayan and Andes regions. High sediment concentration in water of such areas wears down the ... -
Investigation of Small Scale Solar Concentrating Parabolic Dish with Heat Storage: [Low to Medium Temperature Applications]
(Doktoravhandlinger ved NTNU, 1503-8181; 2011:312, Doctoral thesis, 2011)This PhD thesis focuses on the development and testing of a small scale concentrating parabolic dish with heat storage for low to medium temperature applications. The system consists of a parabolic dish solar concentrator ... -
Investigation of suction capability of a centrifugal pump impeller
(Master thesis, 2021)Sentrifugalpumper er en turbomaskin, hvor løpehjulet øker trykket i væsken. Den første kjente prototypen for en sentrifugalpumpe eksisterte allerede på 1400-tallet. Det har vært en konstant utvikling fra den første kjente ... -
Investigation of terrain effects with respect to wind farm siting
(Doctoral Theses at NTNU, 1503-8181; 2009:199, Doctoral thesis, 2009)The turbulent flow above complex and generic terrain has been investigated in a wind tunnel. The objective was to generate a test case for numerical models, and to investigate flow above complex terrain with a view to wind ... -
Investigation of the effect of indoor environment on hypothermia and energy consumption in operating rooms
(Master thesis, 2021)Årlig får rundt 3.1% av pasienter ved norske sykehus infeksjoner som oppstår i forbindelse med operasjoner (SSI) (St.Olavs, 2019). Flere faktorer vil forebygge infeksjoner, men det er essensielt å holde pasienten i normotermi ... -
Investigation of the Flow through the Runner of a Cross-Flow Turbine
(Master thesis, 2009)The cross-flow turbine is unique due to the generation of power during two stages. The water flows through the rectangular cross-section nozzle and enters the runner, where the first stage power is generated. The water ... -
The investigation of the influence of thermal plume and breathing on sleeping microenvironment
(Peer reviewed; Journal article, 2021)Most of humans’ lifetime was spent indoor, especially in bedroom. Thus, understanding the characteristics of the sleep microenvironment is a prerequisite for better control and improvement of our sleeping environment. This ... -
Investigation of the Model Structure for Low-Order Grey-Box Modelling of Residential Buildings
(Chapter, 2019)Model Predictive Control (MPC) is a key technology to activate the building energy flexibility. A reliable control-based model should be developed for each specific building. The structure of grey-box models is usually ... -
Investigation of the Numerical Methodology of a Model Wind Turbine Simulation
(Journal article; Peer reviewed, 2018)The present work aims to investigate different methodologies for the numerical simulation of an upwind three-bladed wind turbine; which is supposed to be a base model to simulate icing in cold climate windmills. That is a ... -
Investigation of the relationship between water quality variations and cavitation occurence in power plants
(Doctoral thesis at NTNU;2016:26, Doctoral thesis, 2016)Lab experiments on clean water samples have revealed that water may withstand large tension; a state which could be explained as negative pressure, without occurrence of cavitation. At the same time, one struggles to ... -
Investigation of the structure of oxy-fuel flames using Raman laser diagnostics
(Doktoravhandlinger ved NTNU, 1503-8181; 2012:166, Doctoral thesis, 2012)