Browsing Institutt for prosess-, energi- og miljøteknologi by Issue Date

Now showing items 81-100 of 333

    • Modeling and simulation of lab-scale anaerobic co-digestion of MEA waste 

      Wang, Shuai; Hovland, Jon; Bakke, Rune (Journal article; Peer reviewed, 2014)
      Anaerobic digestion model No.1 (ADM1) was applied and expanded in this study to model and simulate anaerobic digestion (AD) of an industrial carbon capture reclaimer MEA (monoethanolamine) waste (MEAw) together with easily ...

    • Biogas purification using membrane micro-aeration: A mass transfer analysis 

      Bakke, Rune; Perera, Degurunnehalage Wathsala U.; Botheju, Paranavidanelage Deshai (Journal article; Peer reviewed, 2014)
      When sulfur containing organic feedstocks undergo anaerobic digestion, sulfides are formed due to the biological activities of sulfur reducing bacteria. Presence of hydrogen sulfide (H2S) negatively affects the usage of ...

    • Firefly optimization and mathematical modeling of a vehicle crash test based on single-mass 

      Klausen, Andreas; Tørdal, Sondre Sanden; Karimi, Hamid Reza; Robbersmyr, Kjell G; Jecmenica, Mladen; Melteig, Ole (Journal article; Peer reviewed, 2014)
      In this paper mathematical modeling of a vehicle crash test based on a single-mass is studied. The model under consideration consists of a single-mass coupled with a spring and/or a damper. The parameters for the spring ...

    • Application of 15N-NMR spectroscopy to analysis of amine based CO2 capture solvents 

      Perinu, Cristina; Arachchige, Gumunu L. Samarakoon; Arstad, Bjørnar; Jens, Klaus-Joachim (Journal article; Peer reviewed, 2014)
      15N NMR spectroscopy is a useful tool for amine reactivity characterization since it can provide information about the availability of the lone pair of electrons on nitrogen through the measured chemical shift values, which ...

    • Kiln process impact of alternative solid fuel combustion in the cement kiln main burner - Mathematical modelling and full-scale experiment 

      Ariyaratne, W. K. Hiromi; Melaaen, Morten Christian; Tokheim, Lars-André; Manjula, Edirisinghe V. P. J. (Journal article; Peer reviewed, 2014-02)
      Increased use of alternative fuels in cement kilns is a trend in the world. However, replacing fossil fuels like coal with different alternative fuels will give various impacts on the overall kiln process due to the fuel ...

    • Determination of biomass fraction for partly renewable solid fuels. 

      Ariyaratne, W. K. Hiromi; Melaaen, Morten Christian; Tokheim, Lars-André (Journal article; Peer reviewed, 2014-04-29)
      Biomass-based waste fuels are used in many industrial applications since combustion of biomass gives no net emissions of carbon dioxide. Some waste fuels, e.g. RDF (refuse derived fuels), contain not only biomass, but also ...

    • Effects of Psychrophilic Storage on Manures as Substrate for Anaerobic Digestion 

      Bergland, Wenche Hennie; Dinamarca, Carlos; Bakke, Rune (Journal article; Peer reviewed, 2014-08-05)
      The idea that storage can enhance manure quality as substrate for anaerobic digestion (AD) to recover more methane is evaluated by studying storage time and temperature effects on manure composition. Volatile fatty acids ...

    • Experimental Study of Gas Explosions in Hydrogen Sulfide-Natural Gas-Air Mixtures 

      Gaathaug, André Vagner; Bjerketvedt, Dag; Vågsæther, Knut; Nilsen, Sandra Hennie (Journal article; Peer reviewed, 2014-08-21)
      An experimental study of turbulent combustion of hydrogen sulfide (H2S) and natural gas was performed to provide reference data for verification of CFD codes and direct comparison. Hydrogen sulfide is present in most crude ...

    • Bidomain Simulations of Subendocardial Ischemia: The Forward and Inverse Problems 

      Lysaker, Ola Marius; Nielsen, Bjørn Fredrik; Wall, Samuel (Journal article; Peer reviewed, 2014-09)
      We provide an analysis of the bidomain theory in relation to anterior subendocardial ischemia. Using the static bidomain model, this analysis explains why simulations often do not produce ST depression when the ischemia ...

    • An experimental investigation of rapid boiling of CO2 

      Tøsse, Sindre; Vågsæther, Knut; Bjerketvedt, Dag (Journal article; Peer reviewed, 2014-09-27)
      Storage of pressurized liquified gases is a growing safety concern in many industries. Knowledge of the thermodynamics and kinetics involved in the rapid depressurization and evaporation of such substances is key to the ...

    • High rate manure supernatant digestion 

      Bergland, Wenche Hennie; Dinamarca, Carlos; Toradzadegan, Mehrdad; Nordgård, Anna Synnøve Røstad; Bakke, Ingrid; Bakke, Rune (Journal article; Peer reviewed, 2015)
      The study shows that high rate anaerobic digestion may be an efficient way to obtain sustainable energy recovery from slurries such as pig manure. High process capacity and robustness to 5 % daily load increases are observed ...

    • Gasification of Biomass for Production of Syngas for Biofuel 

      Adhikari, Umesh; Eikeland, Marianne Sørflaten; Halvorsen, Britt (Journal article; Peer reviewed, 2015)
      Continuously increasing price of oil and gas, energy crisis and increased environmental consciousness towards the greenhouse gas emission have opened a new opportunity to the biomass, the oldest source of energy known to ...

    • Thermal Design of Future Medium Voltage Switchgear 

      Fjeld, Elin; Rondeel, Wilhelm; Vågsæther, Knut; Saxegaard, Magne; Skryten, Pål; Attar, Elham (Conference object; Peer reviewed, 2015)
      Air is a desirable alternative to SF6 in medium voltage (MV) switchgear. However, the thermal properties of air is poorer compared with SF6, and this paper presents a first step in the process of finding an optimized thermal ...

    • Using the quantum yields of photosystem II and the rate of net photosynthesis to monitor high irradiance and temperature stress in Chrysanthemum (Dendranthema grandiflora) 

      Janka Wakjera, Eshetu; Körner, Oliver; Rosenqvist, Eva; Ottosen, Carl-Otto (Journal article; Peer reviewed, 2015)
      Under a dynamic greenhouse climate control regime, temperature is adjusted to optimise plant physiological responses to prevailing irradiance levels; thus, both temperature and irradiance are used by the plant to maximise ...

    • High rate manure slurry anaerobic digestion 

      Bergland, Wenche Hennie; Dinamarca, Carlos; Toradzadegan, Mehrdad; Nordgård, Anna Synnøve Røstad; Bakke, Ingrid; Bakke, Rune (Journal article, 2015)
      The study shows that high rate anaerobic digestion may be an efficient way to obtain sustainable energy recovery from slurries such as pig manure. High process capacity and robustness to 5% daily load increases are observed ...

    • Computational study of fingering phenomenon in heavy oil reservoir with water drive 

      Wijeratne, D. I. Erandi N.; Halvorsen, Britt (Journal article, 2015)
      The objective of this paper is to numerically study the flow in heavy oil reservoir with water drive. The main focus is to investigate the viscous fingering phenomenon and how it affects the oil recovery. Two-dimensional ...

    • Simulation of improved absorption configurations for CO2 capture 

      Øi, Lars Erik; Aromada, Solomon Aforkoghene (Conference object; Peer reviewed, 2015-11-25)
      The most well-known technology for post combustion CO2 capture from exhaust gas is absorption in an amine-based solvent followed by desorption. The drawback of this method is the high heat consumption required for desorption. ...

    • Simulation of Gasification of Livestock Manure with Aspen Plus 

      Haugen, Hildegunn H.; Halvorsen, Britt; Eikeland, Marianne Sørflaten (Conference object; Peer reviewed, 2015-11-25)
      Gasification is a flexible technology where all types of organic waste including biomass from manure can be used as feed to the reactor. The recovery of energy from solid waste offers several benefits including substantial ...

    • An Optimization Framework for Tracking Droplets in Fire Water Spray Images 

      Lundberg, Joachim; Lysaker, Ola Marius (Conference object; Peer reviewed, 2015-11-25)
      The properties of the flow from fire water nozzles, like droplet size and velocity distribution within the spray, are known to influence the fire suppression efficiency. To analyze the flow properties, the water spray is ...

    • Temperature Effects in Anaerobic Digestion Modeling 

      Bergland, Wenche Hennie; Dinamarca, Carlos; Bakke, Rune (Conference object; Peer reviewed, 2015-11-25)
      Temperature effects on kinetic coefficients for the biochemical processes particle disintegration, hydrolysis and substrate uptake reactions were included in the anaerobic digestion model 1 (ADM1). It was evaluated on data ...