Blar i Institutt for energi og prosessteknikk på dokumenttype "Journal article"
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A steady and quasi-steady state analysis on the CO2 hybrid ground-coupled heat pumping system
(Journal article; Peer reviewed, 2017)This article contains the steady and quasi-steady state analysis on a CO2 hybrid ground-coupled heat pumping system for warm climates. The hybrid system uses a combination of ambient air and ground boreholes as a heat sink ... -
A test of the v 2-f k-epsilon turbulence model for the prediction of vortex shedding in the Francis-99 hydrofoil test case
(Journal article; Peer reviewed, 2019)A test of the v 2 − f k − epsilon turbulence model for the flow around the Francis-99 hydrofoil geometry is conducted in order to assess it's accuracy of trailing edge vortex shedding prediction. The model is based on the ... -
A Two-Dimensional Study on the Effect of Anisotropy on the Devolatilization of a Large Wood Log
(Journal article; Peer reviewed, 2019)In this work, a two-dimensional (2D) model for wood particle drying, devolatilization, and char conversion is presented and validated against experimental studies of devolatilization of a large, dry, cylindrical birch wood ... -
A validated CFD model of plain and serrated fin-tube bundles
(Journal article; Peer reviewed, 2018)This work presents a Computational Fluid Dynamics model of helically wound fin tube bundles and demonstrates its predictive capability for thermal-hydraulic performance. A consistent validation against experimental data ... -
A variation focused cluster analysis strategy to identify typical daily heating load profiles of higher education buildings
(Journal article; Peer reviewed, 2017)This paper presents a variation focused cluster analysis strategy to identify typical daily heating energy usage profiles of higher education buildings. Different from the existing cluster analysis studies which were ... -
Accuracy Assessment of the Cartesian grid method for compressible inviscid flows using a simplified ghost point treatment
(Peer reviewed; Journal article, 2011)We introduce a new approach to treat ghost points near embedded boundaries tosolve the 2D compressible Euler equations on a Cartesian grid. Solid wall boundary conditionsare imposed by our new approach called simplified ... -
Accurate measurements of CO2 rich mixture phase equilibria relevant for CCS transport and conditioning
(Journal article; Peer reviewed, 2013)This paper describes the experimental rig that has been constructed for the measurements of phase equilibrium of CO2-rich mixtures under relevant conditions for CCS transport and conditioning. The rig is believed to have ... -
Accurate phase equilibrium measurements of CO2 mixtures
(Journal article; Peer reviewed, 2014)A new setup for accurate measurement of phase behavior of CO2-rich mixtures relevant for CCS has been designed, covering a range between - 60 and 150 °C in temperature and 0.4 and 20 MPa in pressure. In order to design ... -
Accurate quantum-corrected cubic equations of state for helium, neon, hydrogen, deuterium and their mixtures
(Journal article; Peer reviewed, 2020)Cubic equations of state have thus far yielded poor predictions of the thermodynamic properties of quantum fluids such as hydrogen, helium and deuterium at low temperatures. Furthermore, the shape of the optimal α functions ... -
Achieving highly practical capacitance of MnO2 by using chain-like CoB alloy as support
(Journal article; Peer reviewed, 2018)The practical performance of MnO2 as a capacitor material is limited mainly by its poor electronic conductivity. Arranging MnO2 on the conductive backbone to form a unique hierarchical nanostructure is an efficient way to ... -
Achieving the Sustainable Development Goals in the post-pandemic era
(Peer reviewed; Journal article, 2022)The COVID-19 pandemic continues to pose substantial challenges to achieving the Sustainable Development Goals (SDGs). Exploring systematic SDG strategies is urgently needed to aid recovery from the pandemic and reinvigorate ... -
Achieving zero-energy building performance with thermal and visual comfort enhancement through optimization of fenestration, envelope, shading device, and energy supply system
(Peer reviewed; Journal article, 2021)Building retrofitting towards nearly zero energy building (nZEB) with comfortable visual and thermal conditions, requires a comprehensive parametric analysis of building retrofit measures. This paper presented an optimization ... -
Acid Gas Removal in Geothermal Power Plant in Iceland
(Journal article; Peer reviewed, 2016-01)A large part of the energy covering the electricity and heating demands in Iceland is generated in geothermal power plants. The Hellisheiði power plant, designed for 300 MWe and 133 MWth, is located in close proximity to ... -
Acoustic-Convective Interference in Transfer Functions of Methane/Hydrogen and Pure Hydrogen Flames
(Peer reviewed; Journal article, 2021)We investigate the occurrence and source of modulations in the gain and phase of flame transfer functions (FTF) measured in perfectly premixed, bluff body stabilized CH4=H2 and pure H2 flames. The modulations are shown to ... -
An action plan for the agri-food sector at the time of the climate and biodiversity crises
(Journal article; Peer reviewed, 2023) -
Active supply diffuser application in all-air heating systems
(Journal article; Peer reviewed, 2019)Substantial reductions in energy use can be achieved by promoting low energy building technologies such as all-air systems. There is an idea that integrating active supply diffuser with all-air systems can potentially ... -
Actuation efficiency of nanosecond repetitively pulsed discharges for plasma-assisted swirl flames at pressures up to 3 bar
(Peer reviewed; Journal article, 2021)This study analyzes different strategies of plasma actuation of premixed swirl flames at pressures up to 3 bar. A wide range of applied voltages and pulse repetition frequencies (PRF) is considered, resulting in different ... -
Adaptive Linear Grey-Box Models for Model Predictive Controller of Residential Buildings
(Peer reviewed; Journal article, 2022)Model predictive control (MPC) is an advanced optimal control technique to minimize a control objective while satisfying a set of constraints and is well suited to activate the building energy flexibility. The MPC controller ... -
Adaptive Moving Horizon Estimator for Return Flow Rate Estimation using Fluid Levels of a Venturi Channel
(Peer reviewed; Journal article, 2020)Real-time estimation of the return drilling fluid during oil well drilling is investigated in this study. Online fluid level measurements from a Venturi channel which can be placed on the return flowline is used with a ... -
Adaptively Learned Modeling for a Digital Twin of Hydropower Turbines with Application to a Pilot Testing System
(Peer reviewed; Journal article, 2023)In the development of a digital twin (DT) for hydropower turbines, dynamic modeling of the system (e.g., penstock, turbine, speed control) is crucial, along with all the necessary data interface, virtualization, and dashboard ...