Institutt for energi og prosessteknikk
Recent Submissions
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Building Services Solutions Suitable for a Low Emission Urban Areas
(ZEN Report;, Research report, 2020)It is believed that well-performing building envelopes with low thermal losses and low solar heat gains enable simplified building services solutions. The purpose of this report is to summarize the status of promising ... -
A detailed review on CO2 two-phase ejector flow modeling
(Peer reviewed; Journal article, 2020)Ejector-equipped vapor-compression systems for refrigeration and cooling, relying solely on (R744) as a natural working fluid, are perceived to be an eco-friendly and highly efficient solution for many applications. However, ... -
The impact of upstream turbulence on a plane jet
(Peer reviewed; Journal article, 2021)The influence of upstream turbulence on the flow produced by a plane jet is investigated experimentally with hot-wire anemometry and smoke flow visualisation. An innovative active grid, where each wing can be independently ... -
The influence of interfacial transfer and film coupling in the modeling of distillation columns to separate nitrogen and oxygen mixtures
(Peer reviewed; Journal article, 2020)Coupling between heat and mass transfer occurs across interfaces and in vapor and liquid films. In this work, we present the first rigorous investigation of the role of these physical phenomena in the mathematical modeling ... -
Pathways to low-cost clean hydrogen production with gas switching reforming
(Peer reviewed; Journal article, 2020)Gas switching reforming (GSR) is a promising technology for natural gas reforming with inherent CO2 capture. Like conventional steam methane reforming (SMR), GSR can be integrated with water-gas shift and pressure swing ... -
Compatible solid polymer electrolyte based on methyl cellulose for energy storage application: Structural, electrical, and electrochemical properties
(Peer reviewed; Journal article, 2020)Compatible Green polymer electrolytes based on methyl cellulose (MC) have been prepared for energy storage electrochemical double-layer capacitor (EDLC) application. X-ray diffraction was accomplished for structural ... -
Blending and characteristics of electrochemical double-layer capacitor device assembled from plasticized proton ion conducting chitosan:dextran:NH4PF6 polymer electrolytes
(Peer reviewed; Journal article, 2020)This research paper investigates the electrochemical performance of chitosan (CS): dextran (DX) polymer-blend electrolytes (PBEs), which have been developed successfully with the incorporation of ammonium hexafluorophosphate ... -
The study of structural, impedance and energy storage behavior of plasticized PVA:MC based proton conducting polymer blend electrolytes
(Peer reviewed; Journal article, 2020)In this study, structural characterization, electrical properties and energy storage performance of plasticized polymer electrolytes based on polyvinyl alcohol/methylcellulose/ammonium thiocyanate (PVA/MC-NH4SCN) were ... -
Characteristics of glycerolized chitosan:NH4NO3-based polymer electrolyte for energy storage devices with extremely high specific capacitance and energy density over 1000 cycles
(Peer reviewed; Journal article, 2020)In this work, plasticized polymer electrolyte films consisting of chitosan, ammonium nitrate (NH4NO3) and glycerol for utilization in energy storage devices was presented. Various microscopic, spectroscopic and electrochemical ... -
Yield improvements in anaerobic digestion of lignocellulosic feedstocks
(Peer reviewed; Journal article, 2020)The new EU bioenergy sustainability criteria demonstrate that bioenergy sustainability can be a challenge (Schlegel and Kaphengst, 2007). In 1990s, the energy crops were the main source for biogas production in Europa; ... -
Energy efficient and climate friendly cooling, freezing and heating onboard fishing vessels
(Master thesis, 2020)Abstract: Liquefied natural gas (LNG) fueled vessels are increasing in the fishing industry due to its reduced environmental footprint as compared to vessels applying heavy hydrocarbon fuels. Cryogenic tanks are used to ... -
Optimal Design of a Hybrid Energy System for the Supply of Clean and Stable Energy to Offshore Installations
(Peer reviewed; Journal article, 2020)This paper presents an innovative hybrid energy system for stable power and heat supply in offshore oil and gas installations. The proposed concept integrates offshore wind power, onsite gas turbines and an energy storage ... -
Aerodynamics of an airfoil with leading-edge icing
(Peer reviewed; Journal article, 2021)Two super duplex stainless steels (SDSS) with different W content, namely UNS S32750 (W-free) and UNS S39274 (2.1 wt.% W), were tested in simulated crevice corrosion environments to determine the influence of W on their ... -
Direct numerical simulation of spray droplet evaporation in hot turbulent channel flow
(Peer reviewed; Journal article, 2020)We perform a direct numerical simulation (DNS) of 14081 “cold” spherical droplets evaporating in a “hot” fully-developed turbulent channel flow. This effort is the first extensive computation that employs four-way coupling ... -
Investigation of a Francis turbine during speed variation: Inception of cavitation
(Peer reviewed; Journal article, 2020)Variable-speed operation of a hydro turbine is considered as an alternative option to meet fluctuating energy demand as it allows high-ramping rate. Cavitation can be a limiting factor to utilize the variable-speed technology ... -
Stochastic Reactor-Based Fuel Bed Model for Grate Furnaces
(Peer reviewed; Journal article, 2020)Biomass devolatilization and incineration in grate-fired plants are characterized by heterogeneous fuel mixtures, often incompletely mixed, dynamical processes in the fuel bed and on the particle scale, as well as heterogeneous ... -
Stratospheric Aerosol Geoengineering could lower future risk of 'Day Zero' level droughts in Cape Town
(Peer reviewed; Journal article, 2020)Anthropogenic forcing of the climate is estimated to have increased the likelihood of the 2015–2017 Western Cape drought, also called 'Day Zero' drought, by a factor of three, with a projected additional threefold increase ... -
Turbulence measurements with fixed and floating profiling wind lidar
(Doctoral thesis, 2020)Knowledge about turbulence in the wind helps estimate and optimize the profitability of wind turbines. Light detection and ranging (lidar) is a cost-efficient, flexible, and accurate remote sensing technology for measuring ... -
Innovative Hybrid Energy System for stable Power and Heat Supply in offshore oil & gas Installation (HES-OFF): System Design and Grid Stability
(Peer reviewed; Journal article, 2020)This paper presents an innovative hybrid energy system for stable power and heat supply in offshore oil & gas installations (HES-OFF). The hybrid concept integrates offshore wind power with gas turbines and a H2 energy ... -
Dissecting the exergy balance of a hydrogen liquefier: Analysis of a scaled-up claude hydrogen liquefier with mixed refrigerant pre-cooling
(Peer reviewed; Journal article, 2020)For liquid hydrogen (LH2) to become an energy carrier in energy commodity markets at scales comparable to for instance LNG, liquefier capacities must be scaled up several orders of magnitude. While state-of-the-art liquefiers ...
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