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Browsing by UPV Unit "Universitat Politècnica de València. Departamento de Termodinámica Aplicada - Departament de Termodinàmica Aplicada"

Now showing items 1-20 of 794

A comparative analysis of a CO2 evaporator model using experimental heat transfer correlations and a flow pattern map

Patino, J.; Llopis, R.; Sanchez, D.; Sanz-Kock, C.; Cabello, R.; Torrella Alcaraz, Enrique (Elsevier, 2014-04)

This work analyses and compares two approaches to evaluate the boiling heat transfer of CO2 in a real evaporation process: classical empirical correlations and flow pattern maps. We develop a finite-volume mathematical ...
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 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 general methodology for energy comparison of intermediate configurations in two-stage vapour compression refrigeration systems

Torrella Alcaraz, Enrique; Larumbe Bernad, Juan Antonio; Cabello, R.; Llopis, R.; Sanchez, D. (Elsevier, 2011-07)

The aim of the present paper is to describe a general methodology suitable for analysing any intermediate configuration considered in staged vapour compression refrigeration cycles. This general methodology only depends ...
A Modular Synthetic Device to Calibrate Promoters

Gamermann, Daniel; Montagud Aquino, Arnau; Aparicio, P.; Navarro-Peris, Emilio; Triana, J.; Villatoro, F.R.; Urchueguía Schölzel, Javier Fermín; Fernández de Córdoba, Pedro (WORLD SCIENTIFIC PUBL CO PTE LTD, 2012-03)

[EN] In this contribution, a design of a synthetic calibration genetic circuit to characterize the relative strength of different sensing promoters is proposed and its specifications and performance are analyzed via an ...
A new moving boundary model for evaluating the performance of wet fins: Application to minichannel evaporators

Hassan, Abdelrahman-Hussein; Martinez-Ballester, Santiago; Gonzálvez-Maciá, José (Elsevier, 2017)

[EN] In this paper, firstly, an innovative numerical model (Fin1D-MB) for wet fins of a minichannel evaporator was developed and verified. The proposed model is based on fin theory in conjunction with the moving boundary ...
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 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 novel TRNSYS type of a coaxial borehole heat exchanger for both short and mid term simulations: B2G model

Cazorla-Marín, Antonio; Montagud- Montalvá, Carla; Tinti, Francesco; Corberán, José M. (Elsevier, 2019)

[EN] A dynamic model of a ground source heat pump system is a very useful tool in order to optimize its design and operation. In order to fairly predict the performance of such a system, the dynamic evolution of the fluid ...
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 quasi-steady state mathematical model of an integrated ground source heat pump for building space control

Corberán Salvador, José Miguel; Finn, D.P.; Montagud Montalvá, Carla Isabel; Murphy, F.T.; Edwards, K.C. (Elsevier, 2011-01)

[EN] This paper is concerned with the development of a mathematical model, capable of describing the quasisteady state performance of an integrated ground source heat pump, which is used for heating and cooling of an ...
A review of refrigerant R1234ze(E) recent investigations

Mota-Babiloni, Adrián; Navarro-Esbrí, J.; Molés, Francisco; Barragán Cervera, Ángel; Peris, Bernardo; Verdú Martín, Gumersindo Jesús (Elsevier, 2016)

[EN] Climate change is demonstrated through global surface temperatures increase in the last century. To stop this phenomenon, new regulations that ban or tax greenhouse gas fluids (HFC among them) have been approved. In ...
A simple model for cooperative and non-exponential processes in non-crystalline polymers

Torregrosa Cabanilles, Constantino; Molina Mateo, José; Meseguer Dueñas, José María; Gómez Ribelles, José Luís (Elsevier, 2011-01-15)

A quite simple Markov chain model is presented in an attempt to understand several characteristic properties of the structural relaxation in glass-former materials. A second order Markov model is proposed for a small region ...
A simplified model for shell-and-tubes heat exchangers. Practical application

Vera-Garcia, Francisco; Garcia-Cascales, J. R.; Gonzálvez-Maciá, José; Cabello, R.; Llopis, R.; Sanchez, D.; Torrella Alcaraz, Enrique (Elsevier, 2010)

[EN] In this paper, a simplified model for the study of shell-and-tubes heat exchangers (HXs) is proposed. The model aims to agree with the HXs when they are working as condensers or evaporators. Despite its simplicity, ...
A study of some fundamental physicochemical variables on the morphology of mesoporous silica nanoparticles MCM-41 type

Beltrán-Osuna, A.A.; Gómez Ribelles, José Luís; Perilla-Perilla, Jairo Ernesto (Springer-Verlag, 2017)

[EN] All variables affecting the morphology of mesoporous silica nanoparticles (MSN) should be carefully analyzed in order to truly tailored design their mesoporous structure according to their final use. Although complete ...
A Tangible Educative 3D Printed Atlas of the Rat Brain

Quiñones, Darío R.; Ferragud-Agulló, Jorge; Pérez Feito, Ricardo; García Manrique, Juan Antonio; Canals-Gamoneda, Santiago; Moratal, David (MDPI AG, 2018-09)

[EN] In biology and neuroscience courses, brain anatomy is usually explained using Magnetic Resonance (MR) images or histological sections of different orientations. These can show the most important macroscopic areas in ...
Accurate broadband measurement of electromagnetic tissue phantoms using open-ended coaxial systems

Fornés Leal, Alejandro; Garcia-Pardo, Concepcion; Castelló-Palacios, Sergio; Vallés Lluch, Ana; Cardona Marcet, Narciso (IEEE, 2007-04-06)

[EN] New technologies and devices for wireless communication networks are continually developed. In order to assess their performance, they have to be tested in realistic environments taking into account the influence of ...
Acrylate-silica polymer nanocomposites obtained by sol-gel reactions. Structure, properties and scaffold preparation

Rodríguez Hernández, José Carlos (Universitat Politècnica de València, 2008-12-15)

El manuscrito versa sobre el desarrollo y caracterización de materiales híbridos basados en poliacrilato de hidroxietilo (a partir de ahora PHEA) reforzado por la inclusión de una fase amorfa de sílice. Ambas fases fueron ...
Adaptation of the B2G dynamic model to new borehole heat exchanger coaxial configurations

Cazorla-Marín, Antonio; Montagud- Montalvá, Carla; Corberán, José M. (Instituto de Ingeniería Energética. Universitat Politècnica de València, 2018)

In order to reach a global reduction in the CO2 emissions, it is key to improve the energy efficiency of systems for producing heating and cooling in buildings. This can be achieved by increasing the use of renewable ...
Ageing effect on morphology, thermal and mechanical properties of impact modified LDPE/PP blends from virgin and recycled materials

Borovanska, Irena; Krastev, Rumen; Benavente, Rosario; Monleón Pradas, Manuel; Vallés Lluch, Ana; Samichov, Vasil; Iliev, Mario (SAGE Publications (UK and US), 2014-08)

An experimental study was conducted to investigate the influence of ageing on the morphological, thermal and mechanical properties of virgin and two types of recycled (from technological and postconsumer wastes) modified ...