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R744 ejector technology future perspectives
(Journal article; Peer reviewed, 2016)Carbon Dioxide, CO2 (R744) was one of the first commonly applied working fluids in the infancy of refrigeration more than 100 years ago. In contrast to ammonia it mainly disappeared after the first generation of synthetic ... -
R744 heat pump solutions for electric vehicles
(Chapter, 2023) -
R744 HVAC unit for NSB Flirt trains
(Master thesis, 2017)The vast majority of current air conditioning systems, for railway HVAC applications, utilize high global warming potential (GWP) hydrofluorocarbon (HFC) refrigerants in a vapor compression cycle. In Europe, the dominating ... -
R744 Refrigeration Solution for Small Supermarkets
(Chapter, 2021)Application based technology solution is nowadays preferred to achieve the performance of the cooling system configuration at its best. Therefore, benchmarking is an essential criterion which would add value to the optimum ... -
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 ... -
Radiative forcing geoengineering causes higher risk of wildfires and permafrost thawing over the Arctic regions
(Journal article; Peer reviewed, 2024)Radiative forcing geoengineering is discussed as an intermediate solution to partially offset greenhouse gas-driven warming by altering the Earth’s energy budget. Here we use an Earth System Model to analyse the response ... -
Rankine-Hugoniot-Riemann solver for steady multidimensional conservation laws with source terms
(Journal article; Peer reviewed, 2014)The Rankine-Hugoniot-Riemann (RHR) solver has been designed to solve steady multidimensional conservation laws with source terms. The solver uses a novel way of incorporating cross fluxes as source terms. The combined ... -
Rapid change of particle velocity due to volatile gas release during biomass devolatilization
(Peer reviewed; Journal article, 2021)Our earlier study showed significant differences in average particle velocity between simulation and experimental results for devolatilizing biomass particles in an idealised entrained flow reactor [N. Guo et al., Fuel, ... -
Rate based modelling of CO2 removal using alkanolamines
(Master thesis, 2014)CO2 is a major acid gas that is required to be removed from natural gas, in order to meet transportation specification. Chemical absorption using amine-based absorbents is a mature and well-known separation process applied ... -
Rate-based modeling of CO₂ absorption in amine solutions, evaluation of mass transfer, kinetics and scale-up
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:354, Doctoral thesis, 2013)Post-combustion CO2 capture (PCC) with chemical solvents is a near-term option for commercial deployment of CO2 capture from power plants. However, the technology is energy intensive and costly, and there is no experience ... -
The Rayleigh integral is always positive in steadily operated combustors
(Peer reviewed; Journal article, 2022)The Rayleigh index has been used for decades by a large number of researchers as an indicator to determine if a flame is driving or damping thermoacoustic interaction mechanisms. The use of the Rayleigh criterion has found ... -
Reactions of acid gases with calcium hydroxide
(Master thesis, 2007)Abstract Sulphur and Chlorine containing fuels form SO2 and HCl during combustion. They have to be removed from the flue gas with means as optimized as possible both economically and technically. In order to do so maximum ... -
A reactor-scale CFD model of soot formation during high-temperature pyrolysis and gasification of biomass
(Peer reviewed; Journal article, 2021)Soot generation is an important problem in high-temperature biomass gasification, which results in both air pollution and the contamination of gasification equipment. Due to the complex nature of biomass materials and the ... -
Real Time Modelling of Flow Systems
(Master thesis, 2013)Hydro power plants are operated in a different manner than what they used to be, due to increased focus on economy, and less on operating on best efficiency point. This creates new challenges related to wear and tear of ... -
Recent Advances and Prospects of FeOOH-Based Electrode Materials for Supercapacitors
(Peer reviewed; Journal article, 2023)Supercapacitors (SCs) offer a potential replacement for traditional lithium-based batteries in energy-storage devices thanks to the increased power density and stable charge–discharge cycles, as well as negligible environmental ... -
Recent Developments and New Results on The Flow Around an Inclined 6:1 Prolate Spheroid
(Chapter, 2017)In the light of new computational resources and improved simulation tools we present new simulations of the flow around an inclined 6:1 prolate spheroid. We present the development of the flow from the symmetric and laminar ... -
Recent Developments in Cooling Systems and Cooling Management for Electric Motors
(Peer reviewed; Journal article, 2023)This study provides an overview of new trends in the development of cooling systems for electric motors. It includes a summary of academic research and patents for cooling systems implemented by leading motor manufacturers ... -
Recent developments in the sonoelectrochemical synthesis of nanomaterials
(Peer reviewed; Journal article, 2019)In recent years, the synthesis and use of nanoparticles have been of special interest among the scientific communities due to their unique properties and applications in various advanced technologies. The production of ... -
Recent global land cover dynamics and implications for soil erosion and carbon losses from deforestation
(Peer reviewed; Journal article, 2021)Changes in land cover are increasingly affecting land surface properties and provision of ecosystem services. Understanding recent historical land cover changes and their interlinkages with key environmental processes is ... -
Recent Progress in Assessment of Resource Efficiency and Environmental Impacts Embodied in Trade: An Introduction to this Special Issue
(Journal article; Peer reviewed, 2018)This paper serves as an introduction to this special issue on the use of multiregional input‐output modeling in assessments of natural resource use and resource use efficiency. Due to globalization, growth in trade has ...