Browsing NTNU Open by Author "Straus, Julian"
Now showing items 1-17 of 17
-
A New Termination Criterion for Sampling for Surrogate Model Generation using Partial Least Squares Regression
Straus, Julian; Skogestad, Sigurd (Journal article; Peer reviewed, 2019)This paper proposes a new incremental sampling method for the generation of surrogate models based on the application of partial least squares regression (PLSR) as a termination criterion. Compared to existing incremental ... -
CO2 Capture and Enhanced Hydrogen Production Enabled by Low-Temperature Separation of PSA Tail Gas: A Detailed Exergy Analysis
Berstad, David Olsson; Straus, Julian; Gundersen, Truls (Journal article; Peer reviewed, 2024)Abstract Hydrogen from natural gas reforming can be produced efficiently with a high CO2 capture rate. This can be achieved through oxygen-blown autothermal reforming as the core technology, combined with pressure-swing ... -
Control of Steady-state Gradient of an Ammonia Reactor using Transient Measurements
Bonnowitz, Harro; Straus, Julian; Krishnamoorthy, Dinesh; Jahanshahi, Esmaeil; Skogestad, Sigurd (Journal article; Peer reviewed, 2018)This paper presents the application of a steady-state real-time optimization strategy using transient measurements to an ammonia synthesis reactor case. We apply a new method for estimating the steady-state gradient of the ... -
Decarbonizing integrated chlor-alkali and vinyl chloride monomer production: Reducing the cost with industrial flexibility
Foslie, Sverre Stefanussen; Straus, Julian; Knudsen, Brage Rugstad; Korpås, Magnus (Peer reviewed; Journal article, 2023)Industrial demand response will become increasingly important in power grids with high shares of variable renewables, yet the existing knowledge on how the industrial electricity demand and flexibility will change with the ... -
Developing hydrogen energy hubs: The role of H2 prices, wind power and infrastructure investments in Northern Norway
Svendsmark, Erik; Straus, Julian; Crespo del Granado, Pedro Andres (Peer reviewed; Journal article, 2024)Hydrogen is seen as a key energy carrier to reduce CO2 emissions. Two main production options for hydrogen with low CO2 intensity are water electrolysis and natural gas reforming with Carbon Capture and Storage, known as ... -
Green or blue? Enabling industrial decarbonization and demand response with hydrogen for high temperature process heating
Foslie, Sverre Stefanussen; Straus, Julian; Korpås, Magnus (Chapter, 2023)Vinyl chloride monomer production coupled with chlor-alkali electrolysis is an industrial process that requires high temperature process heat. One option for providing this process heat in a decarbonized energy system is ... -
Hybrid Versus Radial Offshore Wind Connections: Power Grid Investments in the North Sea
Sævareid, Erik; Durakovic, Goran; Knudsen, Brage Rugstad; Straus, Julian; Tomasgard, Asgeir (Chapter, 2022)To enable offshore wind in the North Sea to take a key, rapid role in the European energy transition, massive grid expansions and investments are required. We consider the impact of such grid expansion in the North Sea on ... -
Hydrogen for harvesting the potential of offshore wind: A North Sea case study
Bødal, Espen Flo; Holm, Sigmund Eggen; Rammohan Subramanian, Avinash Shankar; Durakovic, Goran; Pinel, Dimitri; Hellemo, Lars; Muñoz Ortiz, Miguel; Knudsen, Brage Rugstad; Straus, Julian (Peer reviewed; Journal article, 2024)Economical offshore wind developments depend on alternatives for cost-efficient transmission of the generated energy to connecting markets. Distance to shore, availability of an offshore power grid and scale of the wind ... -
Implementing Low-Emission Hydrogen in Norway: A Techno-Economic Analysis of Production, Investments, and Interplay with the Power System
Svendsmark, Erik (Master thesis, 2024)Å redusere avhengigheten av fossile brensler, kjent for sine skadelige CO2-utslipp, er avgjørende for å bekjempe klimaendringene. Dette er imidlertid utfordrende, ettersom det utgjør en betydelig andel av energietterspørselen. ... -
Low Temperature Applications for CO2 Capture in Hydrogen Production
Kim, Donghoi; Berstad, David Olsson; Anantharaman, Rahul; Straus, Julian; Peters, Thijs; Gundersen, Truls (Chapter, 2020)The recent development of the protonic membrane reformer (PMR) technology allows an energy efficient hydrogen production from natural gas. To liquefy and separate CO2 from the retentate gas of the PMR, various low temperature ... -
Next frontiers in energy system modelling: A review on challenges and the state of the art
Fodstad, Marte; Crespo del Granado, Pedro; Hellemo, Lars; Knudsen, Brage Rugstad; Pisciella, Paolo; Silvast, Antti; Bordin, Chiara; Schmidt, Sarah; Straus, Julian (Peer reviewed; Journal article, 2022)Energy Systems Modelling is growing in relevance on providing insights and strategies to plan a carbon-neutral future. The implementation of an effective energy transition plan faces multiple challenges, spanning from the ... -
On combining self-optimizing control and extremum-seeking control - Applied to an ammonia reactor case study
Straus, Julian; Krishnamoorthy, Dinesh; Skogestad, Sigurd (Journal article; Peer reviewed, 2019) -
Optimal Operation of Integrated Chemical Processes: With Application to the Ammonia Synthesis
Straus, Julian (Doctoral theses at NTNU;2018:222, Doctoral thesis, 2018)Chemical processes have to be operated at their economic optimum to remain competitive. This is called optimal operation. Optimal operation is frequently incorporated using a real-time optimization approach. In this approach, ... -
Optimisation of an Ammonia Synthesis Loop - Investigation of a Novel Approach for Optimisation of Integrated plants
Bland, Martin Jonathan (Master thesis, 2015)A Hysys model representing the steady state behaviour of a Haber-Bosch ammonia plant was developed based on a dynamic model and plant data from Norwegian fertiliser company Yara International ASA. The plant model was ... -
Self-Optimizing Control in Chemical Recycle Processes
Straus, Julian; Skogestad, Sigurd (Journal article; Peer reviewed, 2018)An engineer always has to make assumptions about the system boundary. In this paper, the impact of neglected dependencies of manipulated variables on the disturbance variables as example for said assumptions is investigated ... -
Surrogate Model Development for an Ammonia Synthesis Process
Wang, Kun (Master thesis, 2017)In this thesis, a surrogate model is aimed to be constructed for the separation-refrigeration (S-R) section in the ammonia plant. First, the variables defining the process are classified by input variables and output ... -
Surrogate model generation using self-optimizing variables
Straus, Julian; Skogestad, Sigurd (Journal article; Peer reviewed, 2018)This paper presents the application of self-optimizing concepts for more efficient generation of steady-state surrogate models. Surrogate model generation generally has problems with a large number of independent variables ...