Institutt for energi og prosessteknikk
Recent Submissions
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Thermal two-phase flow with a phase-field method
(Journal article; Peer reviewed, 2018)Phase field methods have become of great interest for the simulation of droplet and bubble dynamics, moving free interfaces and more recently phase change phenomena. One example is the Navier–Stokes–Korteweg (NSK) equations. ... -
Numerical Generation of Hill-Diagrams; Validation on the Francis99 Model Turbine
(Journal article; Peer reviewed, 2018)This article compares a numerically simulated, and an experimentally obtained Hill-Diagram. The Francis99 model turbine was used in the validation. By using steady-state simulations and passage modeling in ANSYS CFX, the ... -
Numerical viscosity in large time step hll-type schemes
(Journal article; Peer reviewed, 2018)We consider Large Time Step (LTS) methods, i.e., the explicit finite volume methods not limited by the Courant–Friedrichs–Lewy (CFL) condition. The original LTS method (LeVeque in SIAM J Numer Anal 22, 1985) was constructed ... -
Radiative forcing bias of simulated surface albedo modifications linked to forest cover changes at northern latitudes
(Journal article; Peer reviewed, 2015)In the presence of snow, the bias in the prediction of surface albedo by many climate models remains difficult to correct due to the difficulties of separating the albedo parameterizations from those describing snow and ... -
Impacts of onshore wind energy production on birds and bats: recommendations for future life cycle impact assessment developments
(Journal article; Peer reviewed, 2018)Models for quantifying impacts on biodiversity from renewable energy technologies are lacking within life cycle impact assessment (LCIA). We aim to provide an overview of the effects of wind energy on birds and bats, with ... -
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 ... -
Sheared free-surface flow over three-dimensional obstructions of finite amplitude
(Journal article; Peer reviewed, 2019)When shallow water flows over uneven bathymetry, the water surface is modulated. This type of problem has been revisited numerous times since it was first studied by Lord Kelvin in 1886. Our study analytically examines ... -
Oblique waves on a vertically sheared current are rotational
(Journal article; Peer reviewed, 2016)In the study of surface waves in the presence of a shear current, a useful and much studied model is that in which the shear flow has constant vorticity. Recently it was shown by Constantin (2011) that a flow of constant ... -
Simulation and Discussion of Models for Hydraulic Francis Turbine Simulations
(Journal article; Peer reviewed, 2018)The paper presents simulations using three different models for a hydraulic turbine. The models are too simple and unrealistic to be used for actual simulations, but the intention is to discuss behaviour intrinsic to the ... -
A novel methodology for Rankine cycle analysis with generic heat exchanger models
(Journal article; Peer reviewed, 2019)This study presents a novel approach for Rankine cycle (RC) analysis, introducing a generic counter current heat exchanger (HX) model to enable basic fluid thermal and flow behaviour in HXs to be considered in a cycle ... -
Review of HVAC strategies for energy renovation of detached houses towards nZEB in cold climates
(Journal article; Peer reviewed, 2019)This paper provides a review of heat and ventilation measures that can be applied to ambitious energy renovation of detached houses in Nordic countries. In this review, requirements for solutions are defined. Key technologies ... -
Techniques for airflow measurements to determine the real efficiency of heat recovery in ventilation systems
(Journal article; Peer reviewed, 2019)Heat recovery in ventilation is essential to reduce energy use and thus mitigate greenhouse gas emissions from the building sector. Heat recovery efficiency of at least 80 % in new buildings is required according to Norwegian ... -
A Norwegian zero emission neighbourhood (ZEN) definition and a ZEN key performance indicator (KPI) tool
(Journal article; Peer reviewed, 2019)Within the Norwegian Research Centre for Zero Emission Neighbourhoods (ZEN) in smart cities, a definition for achieving zero emission neighbourhoods will be developed and tested against nine pilot areas. The ZEN definition ... -
Opportunities for Local Energy Supply in Norway: A Case Study of a University Campus Site
(Journal article; Peer reviewed, 2019)Neighbourhoods can contribute to climate change mitigation by supplying and/or facilitating renewable energy sources (RES). In this context, we evaluate opportunities related to the energy system of a Norwegian university ... -
Metodikk for design av varmepumpeanlegg for omsorgssentre/sykehjem ved bruk av miljøvennlig arbeidsmedium - og saksstudie fra et kommunalt omsorgssenter
(Master thesis, 2019)Avhandlingen foreslår metodikk for design av varme-/kjølesystem for omsorgssentre/sykehjem ved bruk av varmepumpe med miljøvennlig arbeidsmedium. Metodikken er beregnet for tilfeller med oppgradering av energisentral, ... -
Performance operation of liquid ejectors for a R744 integrated multi-ejector supermarket system using a hybrid ROM
(Journal article; Peer reviewed, 2019)Performance maps were generated for designed liquid ejectors installed in a multi-ejector module in an R744 integrated supermarket system using a hybrid of the reduced-order model (ROM). Hybrid ROMs of the investigated ... -
Multidimensional regulation of Ni3S2@Co(OH)2 catalyst with high performance for wind energy electrolytic water
(Journal article; Peer reviewed, 2019)Combining renewable energy technologies with water electrolyzers to produce green hydrogen should provide a very promising strategy for future sustainable and pollution-free energy supply. In this study, 3-D Ni3S2@Co(OH)2 ... -
WaterMet2: a tool for integrated analysis of sustainability-based performance of urban water systems
(Journal article; Peer reviewed, 2014)This paper presents the “WaterMet2 ” model for long-term assessment of urban water system (UWS) performance which will be used for strategic planning of the integrated UWS. WaterMet2 quantifies the principal water-related ... -
Model reformulations for Work and Heat Exchange Network (WHEN) synthesis problems
(Journal article; Peer reviewed, 2019)The Duran-Grossmann model can deal with heat integration problems with variable process streams. Work and Heat Exchange Networks (WHENs) represent an extension of Heat Exchange Networks. In WHEN problems, the identities ... -
Energy generation and storage by salinity gradient power: A model-based assessment
(Journal article; Peer reviewed, 2019)Three energy storage systems based on mixing and desalination of solutions with different salt concentrations are presented, namely, reverse electrodialysis, pressure retarded osmosis and capacitive Donnan potential, coupled ...
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