Browsing Institutt for kjemisk prosessteknologi by Journals "Computer-aided chemical engineering"
Now showing items 1-12 of 12
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A Shortcut Design for Kaibel Columns Based on Minimum Energy Diagrams
(Journal article; Peer reviewed, 2011)In this paper, a shortcut procedure is proposed to design a 4-product dividing-wall column. It is based on the information derived from Vmin diagram. This has the advantage of having more meaningful guesses for energy ... -
A simple approach for on-line PI controller tuning using closed-loop setpoint responses
(Journal article; Peer reviewed, 2010) -
Changing between Active Constraint Regions for Optimal Operation: Classical Advanced Control versus Model Predictive Control
(Journal article; Peer reviewed, 2018)Control structures must be properly designed and implemented to maintain optimality. The two options for the supervisory control layer are Advanced Control Structures (ACS) and Model Predictive Control (MPC). To systematically ... -
Control of Steady-state Gradient of an Ammonia Reactor using Transient Measurements
(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 ... -
Control structure design for a CO2-refrigeration system with heat recovery
(Journal article; Peer reviewed, 2019)In this work, we analyze a generic supercritical CO2-refrigeration system with parallel compression, based on systems used for supermarket use. In order to maximize energy efficiency, this system has a “heat-recovery” ... -
Describing CO2-Absorbent Properties in AspenPlus
(Journal article; Peer reviewed, 2019)For the modelling of novel solvent systemsfor CO2-capture in AspenPlus®, data fitting of physical-chemical properties is needed. In this work the challenges and results are presented for fitting such experimental data for ... -
Input transformation for linearization, decoupling and disturbance rejection with application to steam networks
(Peer reviewed; Journal article, 2021)Pressure-flow networks are inherently multivariable, coupled and nonlinear systems that are not straightforward handled by conventional PID controllers. In this work, we analyze the control problem for a steam distribution ... -
Linear Combination of Gradients as Optimal Controlled Variables
(Peer reviewed; Journal article, 2020)In this paper, we show that optimal economic operation can be achieved using feedback control, by controlling the right variables that translate economic objectives into control objectives. We formulate a generic framework ... -
A Non-Autonomous Relativistic Frame of Reference for Unit Operation Design
(Peer reviewed; Journal article, 2020)This contribution presents an efficient systematic algorithm for unit operation design that uses a newly developed non-autonomous relativistic frame of reference (NARF). The NARF is aimed towards the conceptual design of ... -
Optimal Operation and Control of a Thermal Energy Storage System: Classical Advanced Control versus Model Predictive Control
(Peer reviewed; Journal article, 2020)The objective of this work is to define the optimal operation and control for a thermal storage system with heat sources and a consumer, which exchange utilities using one hot water thermal energy storage tank. In this ... -
Optimal Operation and Control of Heat-to-Power Cycles: a New Perspective using a Systematic Plantwide Control Approach
(Journal article; Peer reviewed, 2019)We use a systematic plantwide control framework to analyze optimal operation of a simple heatto- power steam cycle with a single pressure level and a drum. The present control solutions for power plants1 have been developed ... -
Virtual inflow estimation with simplified tuning using cascaded and Kalman-like least squares observers
(Journal article; Peer reviewed, 2018)Multiphase metering is often unavailable, unreliable or expensive, which makes model-based, virtual monitoring a cheap and reliable alternative in order to obtain information about e.g. the inflows to a device. This paper ...