Browsing NTNU Open by Author "Agromayor, Roberto"
Now showing items 1-11 of 11
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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 ... -
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 ... -
Equation-oriented methods for design optimization and performance analysis of radial inflow turbines
Hagen, Brede; Agromayor, Roberto; Nekså, Petter (Peer reviewed; Journal article, 2021)This paper presents methods for design optimization and performance analysis of radial inflow turbines. Both methods are formulated in an equation-oriented manner and involve a single mathematical problem that is solved ... -
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 ... -
Method for mean-line design and performance prediction of one-stage axial turbines
Anderson, Lasse Borg; Agromayor, Roberto; Nord, Lars O. (Chapter, 2022)Today, expanders for Organic Rankine Cycles (ORC) are either inefficient or expensive. One reason for this is that expanders of power conversion systems usually operate under different conditions over an annual perspective. ... -
Multi-Row Adjoint-Based Optimization of NICFD Turbomachinery Using a CAD-Based Parametrization
Agromayor, Roberto; Anand, Nitish; Pini, Matteo; Nord, Lars O. (Journal article, 2021)Currently, most of the adjoint-based design systems documented in the open literature assume that the fluid behaves as an ideal gas, are restricted to the optimization of a single row of blades, or are not suited to impose ... -
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 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 ... -
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 ... -
Simulation of Starting and Stopping Vortices of an Airfoil
Agromayor, Roberto; Rúa Pazos, Jairo; Kristoffersen, Reidar (Journal article; Peer reviewed, 2017)When the flow around a streamlined body is accelerated or decelerated,starting and stopping vortices are shed from the trailing edge of the body, respectively. In this work, the transient flow around a NACA4612 airoil ... -
Techno-economic and thermodynamic optimization of Rankine cycles
Encabo Cáceres, Inés (Master thesis, 2018)Rankine Cycles are an effective and efficient way of producing power from low-medium temperature heat sources when combined with low-medium critical temperature working fluids. The technology provides high flexibility in ...