Blar i NTNU Open på forfatter "Alstad, Vidar"

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    • Controllability Analysis of Ammonia Synthesis Loops 

      Gullberg, Rebecca Maria Brigitte (Master thesis, 2018)
      Present ammonia synthesis loops normally operate under stationary conditions. Generally, ammonia synthesis loops can be slow to ramp up and down due to manual mode operation. Furthermore, load disturbances are not rejected ...

    • Integrated Model Based Control of Topside Process and Production Wells 

      Stange, Martin Berger (Master thesis, 2007)
      In offshore production systems for oil and gas, the wells are usually controlled manually, while the topside process is controlled using a decentralized control system. It is clear that this control structure may not be ...

    • Modeling and Simulation of Anti-slug Control in Hydro Experimental Multiphase Flow Loop 

      Hauge, Einar (Master thesis, 2007)
      Handling slug flow is a matter of necessity in the oil and gas industry. Large slugs cause problems at the production platform by overfilling the first stage separator leading to poor separation and pressure increase, which ...

    • Plantwide control of alkaline water electrolyzer plant for hydrogen production 

      Rizwan, Md (Master thesis, 2020)
      I arbeidet med å dempe klimagassutslipp er utvikling av teknologier som reduserer avhengigheten av fossile brenselbaserte energikilder uunnværlig. For tiden tilbyr hydrogenbaserte teknologier som involverer utvikling av ...

    • Regulering av oljebrønner med varierende aktive begrensninger 

      Kivle, Martin (Master thesis, 2008)
      I offshore produksjonsanlegg er vanligvis brønnene regulert manuelt, mens separasjonsanlegget er regulert ved hjelp av en desentralisert regulator. Det er tydelig at en slik kontroll struktur ikke er optimalt produksjonsmessig. ...

    • Studies on selection of controlled variables 

      Alstad, Vidar (Doktoravhandlinger ved NTNU, 1503-8181; 2005:91, Doctoral thesis, 2005)
      Increased competition in the process industries requires optimal operation and better utilization of raw materials and energy. One strategy for achieving improved production is to use real-time optimization (RTO), based ...