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Browsing by UPV Unit "Universitat Politècnica de València. Instituto de Ingeniería Energética - Institut d'Enginyeria Energètica"

Now showing items 1-20 of 224

A CFD-DEM solver to model bubbly flow. Part I: Model development and assessment in upward vertical pipes

Peña-Monferrer, Carlos; Monrós Andreu, Guillem; Chiva Vicent, Sergio; Martinez-Cuenca, R.; Muñoz-Cobo, J. L. (Elsevier, 2018)

[EN] In the computational modeling of two-phase flow, many uncertainties are usually faced in simulations and validations with experiments. This has traditionally made it difficult to provide a general method to predict ...
A CFD-DEM solver to model bubbly flow. Part II: Critical validation in upward vertical pipes including axial evolution

Peña-Monferrer, Carlos; Monrós-Andreu, Guillem; Chiva Vicent, Sergio; Martinez-Cuenca, R.; Muñoz-Cobo, J. L. (Elsevier, 2018)

[EN] In the computational modeling of two-phase flow, many uncertainties are usually faced in simulations and validations with experiments. This has traditionally made it difficult to provide a general method to predict ...
A comparative study between a two-dimensional numerical minichannel evaporator model and a classical effectiveness-NTU approach under different dehumidifying conditions

Hassan, Abdelrahman Hussein Abdelhalim; Martínez Ballester, Santiago; Gonzálvez Maciá, José (Taylor & Francis, 2015-07-04)

In this article, a two-dimensional numerical model for a minichannel evaporator is implemented. This model takes into account the variation of wall temperature and moist air properties in both longitudinal and transverse ...
A composite spatial grid spectral Green's function method for one speed discrete ordinates eigenvalue problems in two-dimensional Cartesian geometry

Domínguez, Dany S.; Rocha,Rogério V.M.; Iglesias, Susana M.; Escrivá, A.; Alves Filho, Hermes (Elsevier, 2018-11)

[EN] Spectral Green's function nodal methods (SGF) are well established as a class of coarse mesh methods. For this reason, they are widely used in the solution of neutron transport problems in discrete ordinates formulation ...
A comprehensive study of two-stage vapor compression cycles with vapor-injection for heating applications, taking into account heat sink of finite capacity

Tello Oquendo, Fernando M.; Navarro-Peris, Emilio; Gonzálvez-Maciá, José (Elsevier, 2018-09)

[EN] This paper presents a comprehensive study of two-stage vapor compression cycles with vapor-injection for several refrigerants considering that the heat sink has a limited capacity. The key parameters of the cycle ...
A criterion for the transition from wall to core peak gas volume fraction distributions in bubbly flows

Méndez Díaz, Santos; Zenit, Roberto; Chiva Vicent, Sergio; Muñoz-Cobo, J.L.; Martinez-Martinez, Santiago (Elsevier, 2012)

[EN] It has been observed by many authors that for ascending bubbly flows, the gas fraction distributes radially in different manners. Depending on the flow conditions and channel characteristics, the bubbles may accumulate ...
A discussion about the methodology for validating a model of a finned-tube condenser considering different correlations for the heat transfer coefficients and pressure drop

Pisano, Alessandro; Martínez Ballester, Santiago; Corberán Salvador, José Miguel; Hidalgo Mopeán, Fernando; Illán Gómez, Fernando; García Cascales, José Ramón (Taylor & Francis, 2015-07-04)

[EN] The selection of suitable correlations for calculating heat transfer coefficients and pressure drop plays a fundamental role in the use of semi-empirical models for the simulation of the performance of a heat exchanger. ...
A Flipped Learning Agile Methodology for teaching in higher education levels

Águila-León, Jesús; Vargas Salgado, Carlos Afranio; Ribó Pérez, David Gabriel; Bastida Molina, Paula (Editorial Universitat Politècnica de València, 2020-04-10)

[EN] This paper presents the results of implementing the Flipped Learning Agile (FLA) methodology as a general framework to manage courses and to encourage proactive learning for students in higher education levels. Flipped ...
A novel numerical approach for imposing a temperature boundary condition at the borehole wall in borehole fields

Monzó Cárcel, Patricia María; Mogensen, Palne; Acuña, José; Ruiz Calvo, Félix; Montagud Montalvá, Carla Isabel (Elsevier, 2015-03-25)

[EN] The design of a borehole field should be based on a long-term simulation of its thermal response for the intended energy loads. A well-known method to evaluate the response is based on a pre-calculated dimensionless ...
A novel sensor for monitoring of iron (III) ions based on porphyrins

Vlascici, Dana; Fagadar-Cosma, Eugenia; Popa, Iuliana; Chiriac, Vlad; Gil Agustí, María Teresa (MDPI, 2012)

[EN] Three A3B porphyrins with mixed carboxy-, phenoxy-, pyridyl- and dimethoxysubstituent functionalization on the meso-phenyl groups were obtained by multicomponent synthesis, fully characterized and used as ionophores ...
A novel tool for the evaluation and assessment of demand response activities in the industrial sector

Rodríguez-García, Javier; Álvarez, Carlos; Carbonell-Carretero, José-Francisco; Alcázar-Ortega, Manuel; Peñalvo López, Elisa (Elsevier, 2016-10-15)

This paper introduces a novel tool for industrial customers to perform a cost-benefit analysis regarding the implementation of Demand Response (DR) strategies in their facilities with the final goal of softening the impact ...
A novel TRNSYS type for short-term borehole heat exchanger simulation: B2G model

De Rosa, Mattia; Ruiz Calvo, Félix; Corberán Salvador, José Miguel; Montagud Montalvá, Carla Isabel; Tagliafico, Luca (Elsevier, 2015-05-21)

[EN] Models of ground source heat pump (GSHP) systems are used as an aid for the correct design and optimization of the system. For this purpose, it is necessary to develop models which correctly reproduce the dynamic ...
A propane water-to-water heat pump booster for sanitary hot water production: Seasonal performance analysis of a new solution optimizing COP

Tammaro, Marcello; Montagud Montalvá, Carla Isabel; Corberán Salvador, José Miguel; Mauro, Alfonso William; Mastrullo, R. (Elsevier, 2015-03)

[EN] Electrical heat pumps for sanitary hot water production achieve a high performance with a good matching of water and refrigerant temperature profiles during the heat rejection stage, as it happens in CO2 systems. ...
A Review on Battery Charging and Discharging Control Strategies: Application to Renewable Energy Systems

Banguero-Palacios, Edison; Correcher Salvador, Antonio; Pérez-Navarro, Ángel; Morant Anglada, Francisco José; Aristizabal Cardona, Andrés Julián (MDPI AG, 2018)

[EN] Energy storage has become a fundamental component in renewable energy systems, especially those including batteries. However, in charging and discharging processes, some of the parameters are not controlled by the ...
A Symbolic Representation Approach for the Diagnosis of Broken Rotor Bars in Induction Motors

Karvelis, Petros; Georgoulas, George; Tsoumas, Toannis P.; Antonino Daviu, José Alfonso; Climente Alarcón, Vicente; Stylios, Chrysostomos D. (Institute of Electrical and Electronics Engineers (IEEE), 2015-10)

One of the most common deficiencies of currently existing induction motor fault diagnosis techniques is their lack of automatization. Many of them rely on the qualitative interpretation of the results, a fact that ...
A vision on air pollution in cities and the human effect

Cárcel Carrasco, Francisco Javier; Peñalvo López, Elisa; Carnero, María Carmen; Langa Sanchis, Jaime (Universitat Politècnica de València, 2020-12-22)

[EN] The human effect on air quality in cities and the evolution of air pollution is obvious, due to economic activity, vehicle traffic, etc. The situation created indirectly by COVID-19, has caused many countries to impose ...
Adecuación del código SPARC90 para la simulación de la captura de aerosoles por rotura en el generador de vapor

Escrivá Castells, Facundo Alberto; Muñoz-Cobo González, José Luís; Berna Escriche, César; Herranz, L.E. (Sociedad Nuclear Española, 2011-09)

Ponencia acerca de la mejora del cálculo del factor de descontaminación, que cuantifica el valor del cociente entre el flujo másico de entrada y salida de aerosoles durante la fase de expansión del chorro gaseoso que ...
Advanced Induction Motor Rotor Fault Diagnosis via Continuous and Discrete Time-Frequency Tools

Pons Llinares, Joan; Antonino Daviu, José Alfonso; Riera-Guasp, Martín; Lee, Sang Bin; Kang, Tae-june; Yang, Chanseung (Institute of Electrical and Electronics Engineers (IEEE), 2015-03)

Transient-based fault diagnosis in induction motors has gained increasing attention over the recent years. This is due to its ability to avoid eventual wrong diagnostics of the conventional motor current signature analysis ...
An efficient numerical scheme for the simulation of parallel-plate active magnetic regenerators

Torregrosa Jaime, Bárbara; Corberán Salvador, José Miguel; Payá Herrero, Jorge; Engelbrecht, Kurt (Elsevier, 2015-10)

A one-dimensional model of a parallel-plate active magnetic regenerator (AMR) is presented in this work. The model is based on an efficient numerical scheme which has been developed after analysing the heat transfer ...
An Eulerian-Lagrangian open source solver for bubbly flow in vertical pipes

Peña Monferrer, Carlos; Muñoz-Cobo González, José Luís; Monrós Andreu, G.; Martinez Cuenca, R.; Chiva Vicent, Sergio (Sociedad Nuclear Española, 2014-10)

Air-water two-phase flow is present in natural and industrial processes of different nature as nuclear reactors. An accurate local prediction of the boiling flow could support safety and operation analyses of nuclear ...