Blar i NTNU Open på forfatter "Nord, Lars O."
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Effective Concepts for Supplying Energy to a Large Offshore Oil and Gas Area under Different Future Scenarios
Riboldi, Luca; Cheng, Xiaomei; Farahmand, Hossein; Korpås, Magnus; Nord, Lars O. (Journal article; Peer reviewed, 2017)Different possibilities were assessed to supply energy to a large offshore oil and gas area in the North Sea. The concepts studied involved: (i) onsite power generation by means of simple gas turbine cycles, (ii) full ... -
Effects of CO2-Absorption Control Strategies on the Dynamic Performance of a Supercritical Pulverized-Coal-Fired Power Plant
Gardarsdóttir, Stefanía Ósk; Mocholí Montañés, Rubén; Normann, Fredrik; Nord, Lars O.; Johnsson, Filip (Journal article; Peer reviewed, 2017)This work investigates the interactions that occur between a supercritical pulverized-coal-fired power plant and a downstream CO2-absorption process during load changes in the power plant by linking the dynamic models of ... -
Efficiency Correlations for Off-design Performance Prediction of ORC Axial-flow Turbines
Pili, Roberto; Siamisiis, Nikolaos; Agromayor, Roberto; Nord, Lars O.; Wieland, Christoph; Spliethoff, Hartmut (Chapter, 2019)Organic Rankine Cycle (ORC) power systems are efficient and cost-effective to convert heat from low/medium temperature heat sources into electrical or mechanical power. Depending on the time behaviour of the heat and cold ... -
Energy optimization of offshore gas installation
Ramadan, Adel (Master thesis, 2021)The attempt to reduce the environmental impact of offshore gas installations has been the main driver for research in process energy efficiency and energy supply concepts. On the one hand, offshore gas processing is an ... -
Energy utilization from deep geothermal sources
Ommedal, Daniel (Master thesis, 2018)Recently, heat extraction from supercritical water (i.e. high pressure and high temperature) has received significant attention. Supercritical water from aquatic reservoirs several kilometers below the surface are led to ... -
Evaluation of MBTSA technology for CO2 capture from waste-to-energy plants
Mondino, Giorgia; Grande, Carlos Adolfo; Blom, Richard; Nord, Lars O. (Journal article; Peer reviewed, 2022)Moving bed temperature swing adsorption (MBTSA) is a promising technology for CO2 capture from flue gases. In a MBTSA unit, a selective adsorbent material is circulated between a low-temperature stage where it removes CO2 ... -
Exergy Analysis for Combined Heat and Power (CHP) Plants
Rúa, Jairo; Nord, Lars O. (Chapter, 2018)Combined heat and power plants are an efficient technology for waste heat recovery applications where both heat and power are demanded. Steam Rankine cycles are normally utilized when high temperature exhaust streams are ... -
Experimental results of transient testing at the amine plant at Technology Centre Mongstad: Open-loop responses and performance of decentralized control structures for load changes
Mocholí Montañés, Rubén; Flø, Nina Enaasen; Nord, Lars O. (Journal article; Peer reviewed, 2018)Flexible operation of combined cycle thermal power plants with chemical absorption post combustion CO2 capture is a key aspect for the development of the technology. Several studies have assessed the performance of ... -
Flexible operation of combined cycle gas turbine power plants with supplementary firing
Encabo Caceres, Ines; Mocholí Montañés, Rubén; Nord, Lars O. (Journal article; Peer reviewed, 2018)This article covers the use of supplementary firing in a gas-combined cycle power plant when high flexibility is required depending on the penetration of variable renewable energies and under different gas turbine loads. ... -
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 ... -
Gradient-based design optimization and off-design performance prediction of Rankine cycles and Radial Inflow Turbines
Hagen, Brede Andre Larsen (Doctoral theses at NTNU;2022:147, Doctoral thesis, 2022)A major fraction of today's electricity is generated by Rankine cycle power systems utilizing the thermal energy of fossil sources such as coal and natural gas, or nuclear energy. However, the carbon content in the fossil ... -
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 ... -
The Impact of Process Heat on the Decarbonisation Potential of Offshore Installations by Hybrid Energy Systems
Riboldi, Luca; Pilarczyk, Marcin; Nord, Lars O. (Peer reviewed; Journal article, 2021)An opportunity to decarbonise the offshore oil and gas sector lies in the integration of renewable energy sources with energy storage in a hybrid energy system (HES). Such concept enables maximising the exploitation of ... -
An improved combined heat and power economic dispatch model for natural gas combined cycle power plants
Yu, Haiquan; Nord, Lars O.; Cong, Yu; Jianxin, Zhou; Fengqi, Si (Peer reviewed; Journal article, 2020)An increasing number of natural gas combined cycle (NGCC) plants are operated under combined heat and power mode. Therefore, a combined heat and power economic dispatch (CHPED) is the key to achieve the optimal utilization ... -
Improving the off-design efficiency of organic Rankine bottoming cycle by variable area nozzle turbine technology
Motamed, Mohammad Ali; Nord, Lars O. (Chapter, 2021)Organic Rankine cycles (ORCs) are expected to operate more at varied working conditions, especially when rapid growth in renewable energies put power generation technologies in variable load operation. A power cycle works ... -
Innovative Hybrid Energy System for stable Power and Heat Supply in offshore oil & gas Installation (HES-OFF): System Design and Grid Stability
Riboldi, Luca; Alves, Erick Fernando; Pilarczyk, Marcin; Tedeschi, Elisabetta; Nord, Lars O. (Peer reviewed; Journal article, 2020)This paper presents an innovative hybrid energy system for stable power and heat supply in offshore oil & gas installations (HES-OFF). The hybrid concept integrates offshore wind power with gas turbines and a H2 energy ... -
Investigation of control strategies for adsorption-based CO2 capture from a thermal power plant under variable load operation
Skjervold, Vidar Torarin; Mondino, Giorgia; Riboldi, Luca; Nord, Lars O. (Peer reviewed; Journal article, 2023)This work considers the closed-loop behavior of a moving bed temperature swing adsorption process designed to capture CO2 from a coal-fired power plant. Four decentralized control strategies were studied based on step ... -
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 ... -
Machine learning techniques for modeling chemical absorption in CO2 capture process
Zheng, Huilan; Mirlekar, Gaurav; Nord, Lars O. (Chapter, 2022)Post-combustion carbon capture (PCC) technologies play an important role in the reduction of CO2 emissions to address climate challenges. This process is usually simulated in process simulation software based on first-principle ...