Browsing Institutt for kjemisk prosessteknologi by Title
Now showing items 1220-1239 of 1775
-
Optimal operation strategies for dynamic processes under uncertainty
(Doctoral thesis at NTNU;2016:105, Doctoral thesis, 2016)The main focus of this thesis is to find implementation strategies for the optimal operation of processes during transients. That is, we do not focus on the algorithms to solve a given dynamic optimization problem, but ... -
Optimal Operation with Changing Active Constraint Regions using Classical Advanced Control
(Journal article; Peer reviewed, 2018)With ”classical advanced control” we mean the control structures that are commonly used in industry for multivariable control. These have been in use for at least 50 years, but surprisingly there is little literature ... -
Optimal PI and PID control of first-order plus delay processes and evaluation of the original and improved SIMC rules
(Journal article; Peer reviewed, 2018)The first-order plus delay process model with parameters k (gain), τ (time constant) and θ (delay) is the most used representation of process dynamics. This paper has three objectives. First, we derive optimal PI- and ... -
Optimal PID settings for first and second-order processes - Comparison with different controller tuning approaches
(Master thesis, 2016)PID controllers are extensively used in industry. Although many tuning methodologies exist, finding good controller settings is not an easy task and frequently optimization-based design is preferred to satisfy more complex ... -
Optimal Renewable Energy Distribution Between Gasifier and Electrolyzer for Syngas Generation in a Power and Biomass-to-Liquid Fuel Process
(Peer reviewed; Journal article, 2022)By adding energy as hydrogen to the biomass-to-liquid (BtL) process, several published studies have shown that carbon efficiency can be increased substantially. Hydrogen can be produced from renewable electrical energy ... -
Optimal scheduling of flexible thermal power plants with lifetime enhancement under uncertainty
(Peer reviewed; Journal article, 2021)Renewable energy sources have been the focal point to decarbonise the power sector. The large deployment of these intermittent power generation units requires mechanisms to balance the grid. Thermal power plants can provide ... -
Optimal setpoints for a pH neutralization process
(Master thesis, 2013)The purpose of this thesis was to determine the optimal setpoints for a pH neutralization process in three stages. A strong acid is to be neutralized by adding a strong base (reagent) in a series of three mixing tanks. The ... -
Optimal Temperature Control of Rooms for Minimum Energy Cost
(Master thesis, 2013)In this thesis was a room with direct heating in the floor and room modelled. The aim has been to minimize the energy cost of the room, assuming that the future energy price and weather forecast is known. The constrained ... -
Optimal tuning of PID controllers: And the verification of the SIMC rules
(Doctoral theses at NTNU;2018:389, Doctoral thesis, 2018)Optimal tuning of PID controllers and the verification of the SIMC rules The simple PI/PID controller is the most used controller in the process industry. However, finding good settings for this simple controller is not ... -
Optimisation of an Ammonia Synthesis Loop - Investigation of a Novel Approach for Optimisation of Integrated plants
(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 ... -
Optimising surface d charge of AuPd nanoalloy catalysts for enhanced catalytic activity
(Journal article; Peer reviewed, 2019)Understanding the catalytic mechanism of bimetallic nanocatalysts remains challenging. Here, we adopt an adsorbate mediated thermal reduction approach to yield monodispersed AuPd catalysts with continuous change of the ... -
Optimization of a Reactor Network for Production of Butyl Butyrate by an Attainable Region Analysis
(Master thesis, 2017)Butyl butyrate is a promising supplement for jet fuel and diesel. It can be produced in a biotechnological process, by an esterification reaction between butanol and butyric acid. These intermediates can in turn be produced ... -
Optimization of Co-Ni-Mg-Al mixed-oxides CO2 methanation catalysts with solution combustion synthesis: On the importance of Co incorporation and basicity
(Peer reviewed; Journal article, 2023)Hydrogenation of CO2 to methane is a promising prospect for the utilization of carbon dioxide. Ni-Mg-Al mixed oxides have been reported as a catalyst for this process. Their promotion with cobalt allows to improve Ni ... -
Optimization of Deacetylation Process for Regenerated Cellulose Hollow Fiber Membranes
(Journal article; Peer reviewed, 2017)Cellulose acetate (CA) hollow fibers were spun from a CA+ Polyvinylpyrrolidone (PVP)/N-methyl-2-pyrrolidone (NMP)/H2O dope solution and regenerated by deacetylation. The complete deacetylation time of 0.5 h was found at a ... -
Optimization of Energy Storage in Buildings Based on Self-optimizing Control
(Master thesis, 2014)A steadily increasing fraction of Europe's electricity is generated by renewable and less reliable energy sources. It is therefore necessary to find smart ways to store excess energy until it is demanded. This could be ... -
Optimization of fixed-order controllers using exact gradients
(Journal article; Peer reviewed, 2018)Finding good controller settings that satisfy complex design criteria is not trivial. This is also the case for simple fixed-order controllers including the three parameter pid controller. To be rigorous, we formulate the ... -
Optimization of Heat Exchanger Networks using Aspen Energy Analyzer and SeqHENS
(Master thesis, 2019)Syntese av nettverk for varmevekslere har vært et av de mest undersøkte områdene innen prosessindustrien de siste 40 årene. I løpet av 70-tallet ble det rettet stor oppmerksomhet mot dette området på grunn av den første ... -
Optimization of heat exchanger networks using Gaussian process regression
(Master thesis, 2021)Optimal drift av varmevekslernettverk kan spare både energi og penger. Dette studiet utforsket om Gaussiske prosesser kan kontrollere ventilåpninger på et varmevekslernettverk. I praksis er det vanskelig å måle alle tingene ... -
Optimization of Operation and Remaining Lifetime of a Subsea System
(Master thesis, 2016)A model of a subsea system was developed and optimization for operation and remaining life time. For the modelling of the remaining life time the compressor efficiency was used as there is no statistical or physical model ... -
Optimization of PEG-based membranes and mixed matrix membranes for CO2 capture
(Doctoral theses at NTNU;2020:35, Doctoral thesis, 2019)Design better CO2 separation membranes for capture CO2 The elevated CO2 concentration has been widely recognized as one of the main factors leading to the increasing serious global warming. To prevent it from continuing ...