Blar i NTNU Open på forfatter "Nord, Lars O."
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Fluid selection and thermodynamic optimization of organic Rankine cycles for waste heat recovery applications
Agromayor, Roberto; Nord, Lars O. (Journal article; Peer reviewed, 2017)Organic Rankine cycles are effective to convert waste heat to power. One of the advantages and challenges of these cycles is that the most suitable working fluid and cycle configuration have to be selected for every ... -
Gas turbine exhaust gas heat recovery by organic Rankine cycles (ORC) for offshore combined heat and power applications - Energy and exergy analysis
Nami, Hossein; Ertesvåg, Ivar Ståle; Otero, Roberto Agromayor; Riboldi, Luca; Nord, Lars O. (Journal article; Peer reviewed, 2018)Effective heat and power supply to offshore installations leads to environmental benefits, but the efficiency is often limited by requirements and constraints connected to the offshore environment. An exergetic analysis ... -
Identifying operational requirements for flexible CCS plant in future energy systems
Mocholí Montañés, Rubén; Korpås, Magnus; Nord, Lars O.; Jaehnert, Stefan (Journal article; Peer reviewed, 2016)This paper aims at a discussion of operational requirements for thermal power plants with carbon capture and storage in terms of their interaction with the power system, in regions with high penetration of variable renewable ... -
Lifetime Assessment of Combined Cycles for Cogeneration of Power and Heat in Offshore Oil and Gas Installations
Riboldi, Luca; Nord, Lars O. (Journal article; Peer reviewed, 2017)The utilization of combined cycles for offshore cogeneration of power and heat is an attractive option to reduce the CO2 emissions directly related to the oil and gas sector. Main challenges for their efficient implementation ... -
Offshore Power Plants Integrating a Wind Farm: Design Optimisation and Techno-Economic Assessment Based on Surrogate Modelling
Riboldi, Luca; Nord, Lars O. (Journal article; Peer reviewed, 2018)The attempt to reduce the environmental impact of the petroleum sector has been the driver for researching energy efficient solutions to supply energy offshore. An attractive option is to develop innovative energy systems ... -
One-Dimensional Annular Diffuser Model for Preliminary Turbomachinery Design
Agromayor, Roberto; Müller, Bernhard; Nord, Lars O. (Journal article; Peer reviewed, 2019)Annular diffusers are frequently used in turbomachinery applications to recover the discharge kinetic energy and increase the total-to-static isentropic efficiency. Despite its strong influence on turbomachinery performance, ... -
Optimal control of flexible natural gas combined cycles with stress monitoring: Linear vs nonlinear model predictive control
Rúa, Jairo; Nord, Lars O. (Peer reviewed; Journal article, 2020)In future energy markets, traditional thermal power plants are expected to cycle more to adapt their operation to the intermittent power generation of renewable energy sources. Gas turbine load ramps and stresses in ... -
Optimal Design of Flexible Power Cycles through Kriging-based Surrogate Models
Riboldi, Luca; Nord, Lars O. (Chapter, 2018)The paper presents a novel technique to define the optimal design of a power cycle considering design and off-design performance. A Kriging-based surrogate model is developed in order to simulate the power cycle at design ... -
Optimal dynamic operation of natural gas combined cycles accounting for stresses in thick-walled components
Rúa, Jairo; Nord, Lars O.; Agromayor, Roberto; Hillestad, Magne (Journal article; Peer reviewed, 2020)Flexible natural gas combined cycles will play a fundamental role in future electric markets.Stressesinthick-walled components and gasturbine load ramps are arguably the main limiting factors during transient operation.Classical ... -
Optimal Operation and Control of Heat-to-Power Cycles: a New Perspective using a Systematic Plantwide Control Approach
Zotica, Cristina Florina; Nord, Lars O.; Kovács, Jenő; Skogestad, Sigurd (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 ... -
Optimization of Organic Rankine Cycles for Waste Heat Recovery From Aluminum Production Plants
Castelli, Alessandro Francesco; Elsido, Cristina; Scaccabarozzi, Roberto; Nord, Lars O.; Martelli, Emanuele (Journal article; Peer reviewed, 2019)This paper presents the optimization of organic Rankine cycles (ORCs) for recovering waste heat from a hypothetical aluminum production plant to be installed in Norway. The case study is particularly interesting because ... -
Preliminary Design and Optimization of Axial Turbines Accounting for Diffuser Performance
Agromayor, Roberto; Nord, Lars O. (Journal article; Peer reviewed, 2019)Axial turbines are the most common turbine configuration for electric power generation and propulsion systems due to their versatility in terms of power capacity and range of operating conditions. Mean-line models are ... -
Process simulation and plant layout of a combined cycle gas turbine for offshore oil and gas installations
Bimüller, Johannes D.; Nord, Lars O. (Journal article; Peer reviewed, 2015)Since the development of the first oil fields on the Norwegian Continental Shelf, the petroleum industry in Norway has been making continuous progress in oil production engineering. With greater environmental awareness ... -
Production of MOF Adsorbent Spheres and Comparison of Their Performance with Zeolite 13X in a Moving-Bed TSA Process for Postcombustion CO2 Capture
Mondino, Giorgia; Spjelkavik, Aud I.; Nord, Lars O.; Krishnamurthy, Shreenath; Didriksen, Terje; Stensrød, Ruth Elisabeth; Grande, Carlos Adolfo; Blom, Richard (Peer reviewed; Journal article, 2020)Well-shaped 300–700 μm spheres of aggregated metal–organic framework CPO-27-Ni crystallites have been produced using a spray-granulation method with cross-bonded alginate as the binder. The spheres are suitable for use in ... -
Prospects of using equilibrium-based column models in dynamic process simulation of post-combustion CO2 capture for coal-fired power plant
Dutta, Rohan; Nord, Lars O.; Bolland, Olav (Journal article; Peer reviewed, 2017)This paper discusses the limitations and prospects of using equilibrium-based column models for the dynamic simulation of post-combustion CO2 capture processes. Based on their features, one of three available commercial ... -
Selection and design of post-combustion CO2 capture process for 600 MW natural gas fueled thermal power plant based on operability
Dutta, Rohan; Nord, Lars O.; Bolland, Olav (Journal article; Preprint, 2017)Post-combustion CO2 capture (PCC) plant for a typical 600 MW natural gas fueled thermal power plant was designed as a trade-off between operability and mitigation of the efficiency penalty. Two modified PCC plant configurations ... -
Weight and power optimization of steam bottoming cycle for offshore oil and gas installations
Nord, Lars O.; Martelli, Emanuele; Bolland, Olav (Journal article; Peer reviewed, 2014)Offshore oil and gas installations are mostly powered by simple cycle gas turbines. To increase the efficiency, a steam bottoming cycle could be added to the gas turbine. One of the keys to the implementation of combined ...