Browsing NTNU Open by Author "Nord, Lars O."
Now showing items 1-20 of 71
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Acid Gas Removal in Geothermal Power Plant in Iceland
Berstad, David Olsson; Nord, Lars O. (Journal article; Peer reviewed, 2016-01)A large part of the energy covering the electricity and heating demands in Iceland is generated in geothermal power plants. The Hellisheiði power plant, designed for 300 MWe and 133 MWth, is located in close proximity to ... -
Agent-Based and Stochastic Optimization Incorporated with Machine Learning for Simulation of Postcombustion CO2 Capture Process
Zheng, Huilan; Mirlekar, Gaurav; Nord, Lars O. (Journal article, 2022)In this paper, a novel method is proposed for the incorporation of data-driven machine learning techniques into process optimization. Such integration improves the computational time required for calculations during ... -
An Integrated Assessment of the Environmental and Economic Impact of Offshore Oil Platform Electrification
Riboldi, Luca; Völler, Steve; Korpås, Magnus; Nord, Lars O. (Journal article; Peer reviewed, 2019)Electrification of offshore oil and gas installations on the Norwegian continental shelf is one of several options to decrease the CO2 emitted from these installations. However, there is an ongoing debate regarding how the ... -
Applicability and validation of use of equilibrium-based absorber models with reduced stage efficiency for dynamic simulation of post-combustion CO2 capture processes
Dutta, Rohan; Nord, Lars O.; Bolland, Olav (Journal article; Peer reviewed, 2017)Use of complex rate-based models for absorbers in a post-combustion CO2 capture process may lead to high computational complexity and simulation time. Method using reduced stage efficiency in equilibrium-based model for ... -
Assessment of alternative concepts for improved gas turbine operation under varying loads in decarbonized energy systems
Motamed, Mohammad Ali (Doctoral theses at NTNU;2024:120, Doctoral thesis, 2024)This thesis is devoted to the assessment of alternative concepts for improved gas turbine operation under varying loads in decarbonized energy systems. The aim is to contribute towards curbing the emission of Carbon Dioxide ... -
Assessment of organic Rankine cycle part-Load performance as gas turbine bottoming cycle with variable area nozzle turbine technology
Motamed, Mohammad Ali; Nord, Lars O. (Peer reviewed; Journal article, 2021)Power cycles on offshore oil and gas installations are expected to operate more at varied load conditions, especially when rapid growth in renewable energies puts them in a load-following operation. Part-load efficiency ... -
CCS on Offshore Oil and Gas Installation - Design of Post Combustion Capture System and Steam Cycle
Nord, Lars O.; Anantharaman, Rahul; Chikukwa, Actor; Mejdell, Thor (Journal article; Peer reviewed, 2017)Most of the released CO2 on offshore oil and gas installation originates from the gas turbines that power the installations. For certain offshore installations, CO2 capture and storage (CCS) could be an alternative to ... -
The CO2 Capture System with a Swing Temperature Moving Bed
Kozak-Jagieła, Ewa; Rerak, Monika; Zima, Wiesław; Cebula, Artur; Grądziel, Sławomir; Mondino, Giorgia; Blom, Richard; Nord, Lars O.; Skjervold, Vidar Torarin (Peer reviewed; Journal article, 2024)The reduction in CO2 emissions is now a very popular topic. According to the International Energy Agency, CO2 emitted in 2021 was 6% more than that emitted in 2020. Carbon capture and storage (CCS) is gaining popularity ... -
Combined heat and power dynamic economic dispatch considering field operational characteristics of natural gas combined cycle plants
Yu, Haiquan; Jianxin, Zhou; Fengqi, Si; Nord, Lars O. (Peer reviewed; Journal article, 2021)Combined heat and power dynamic economic dispatch (CHPDED) is one of the key technologies for the efficient operation of natural gas combined cycle (NGCC) plants in integrated energy systems. In this study, based on the ... -
Combined heat and power plant on offshore oil and gas installations
Riboldi, Luca; Skjefstad, Håvard Slettahjell; Nord, Lars O.; Følgesvold, Eirik (Journal article; Peer reviewed, 2016)Implementation of energy efficient technologies is an issue of growing importance for the offshore oil and gas industry. The rising awareness to increasing levels of CO2 in the atmosphere is a major contributor to this ... -
Compact steam bottoming cycles: model validation with plant data and evaluation of control strategies for fast load changes
Nord, Lars O.; Mocholí Montañés, Rubén (Journal article; Peer reviewed, 2018)Power plants installed on offshore oil and gas installations need to be operated in a flexible manner in order to accommodate the variability in heat and power demands. The present paper describes steady-state process model ... -
Concepts for lifetime efficient supply of power and heat to offshore installations in the North Sea
Riboldi, Luca; Nord, Lars O. (Journal article; Peer reviewed, 2017)This paper assesses different concepts for efficient supply of power and heat to specific offshore installations in the North Sea, with the objective of cutting carbon dioxide emissions. The concepts analyzed include ... -
Concepts for lifetime efficient supply of power and heat to offshore installations in the North Sea
Riboldi, Luca; Nord, Lars O. (Journal article; Peer reviewed, 2017)This paper assesses different concepts for efficient supply of power and heat to specific offshore installations in the North Sea, with the objective of cutting carbon dioxide emissions. The concepts analyzed include ... -
Data-driven approaches for modelling of sub-critical coal-fired boiler
Formont, Valentin; Skjervold, Vidar T.; Nord, Lars O. (Chapter, 2022)Due to increasing shares of renewable electricity sources in the grid, thermal power plants need to operate in a more flexible manner in the future. This will involve more frequent startups, shutdowns, and load changes. A ... -
Demonstrating load-change transient performance of a commercial-scale natural gas combined cycle power plant with post-combustion CO2 capture
Mocholí Montañés, Rubén; Gardarsdóttir, Stefanía Ósk; Johnson, Filip; Normann, Fredrik; Nord, Lars O. (Journal article; Peer reviewed, 2017)The present work aims to study the transient performance of a commercial-scale natural gas combined cycle (NGCC) power plant with post-combustion CO2 capture (PCC) system via linked dynamic process simulation models. The ... -
Design and Implementation of an Optimal Control Framework for Post-combustion CO2 Capture Process
Mirlekar, Gaurav; Nord, Lars O. (Peer reviewed; Journal article, 2022)The high penetration of renewable sources into fossil fuel-based thermal power plants demand for operational flexibility with Carbon Capture and Storage (CCS) technologies. Post-combustion CO2 Capture (PCC) processes using ... -
Design of an Experimental ORC Expander Setup Using Natural Working Fluids
Pardiñas, Ángel Á.; Pilarczyk, Marcin; Agromayor, Roberto; Nord, Lars O. (Chapter, 2019)Organic Rankine Cycles (ORC) are an efficient and cost-effective technology to generate power from waste heat. Arguably, the two most important factors affecting the performance of the Rankine cycle are the choice of working ... -
Development of a simulation tool for design and off-design performance assessment of offshore combined heat and power cycles
Motamed, Mohammad Ali; Nord, Lars O. (Chapter, 2022)Ambitious targets for reducing carbon dioxide (CO2) emissions are set by Norwegian authorities to address the concerns about global warming. Emission reductions in the offshore heat and power sector can play a role in ... -
Digital Twin Model for Gas Turbine Power Generation Forecasting
Kaplan, Victoria (Master thesis, 2023)In recent years, digital twin models have gained significant interest as powerful tools for predicting the behavior of complex processes and types of equipment, assisting in damage prevention, increasing productivity, and ... -
Does CCS reduce power generation flexibility? A dynamic study of combined cycles with post-combustion CO2 capture
Rúa, Jairo; Bui, Mai; Nord, Lars O.; Mac Dowell, Niall (Journal article; Peer reviewed, 2020)To date, the deployment, integration, and utilization of intermittent renewable energy sources, such as wind and solar power, in the global energy system has been the cornerstone of efforts to combat climate change. At the ...