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Listar por autor "Torrella Alcaraz, Enrique"

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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 dynamic mathematical model of a shell-and-tube evaporator. Validation with pure and blend refrigerants

Llopis, R.; Cabello, R.; Navarro-Esbrí, J.; Torrella Alcaraz, Enrique (John Wiley & Sons, 2007)

[EN] This work presents a mathematical model of a shell-and-tube evaporator based on mass continuity, energy conservation and heat transfer physical fundamentals. The model is formulated as a control volume combination ...
A dynamic model of a shell-and-tube condenser operating in a vapour compression refrigeration plant

Llopis, R.; Cabello, R.; Torrella Alcaraz, Enrique (Elsevier, 2008)

[EN] This work presents a mathematical model of a shell-and-tube condenser based on mass continuity, energy conservation and heat transfer physical fundamentals, whose methodology can be easily adapted for modelling any ...
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 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, ...
Ahorro de energía en la planta de productos congelados de Benimodo ( Grupo Bonduelle) con un consumo eléctrico anual de 16.600.000 kwh y uno de gas de 12.000.000 kwh

Gouëzec, Pierre (Universitat Politècnica de València, 2013-11-29)

Proyecto Confidencial
Analysis of the variation mechanism in the main energetic parameters in a single-stage vapour compression plant

Cabello, R.; Navarro-Esbri, J.; Llopis, R.; Torrella Alcaraz, Enrique (Elsevier, 2007)

[EN] Based on a previously developed and validated steady-state model of a single-stage vapour compression plant, the present paper describes an in-depth study directed to examine the consequences of changes in the operating ...
Balance energético y cálculo de pérdida de potencia por degradación de equipos en una central térmica de ciclo combinado de 800 MW

Urbiola Vega, Javier (Universitat Politècnica de València, 2013-12-12)

Consulta en la Biblioteca ETSI Industriales (7879)
Cálculo y diseño de instalación de agua caliente sanitaria para piscina cubierta y gimnasio

Salvemini Piccin, Juan Ángel (Universitat Politècnica de València, 2013-07-22)

Consulta en la Biblioteca ETSI Industriales (8571)
Climatización de un local comercial

Aixerch Mateu, Carlos (Universitat Politècnica de València, 2015-05-20)

El presente trabajo de fin de grado recoge específicamente las características de la instalación de climatización de un local comercial destinado a exposición y venta de muebles al por menor.
CO2LD: An innovation educational project for High Degree Professional Training in Refrigeration

Sánchez, Daniel; Llopis Rodrigo; Patiño, Jorge; Cabello, Ramón; Torrella Alcaraz, Enrique (OmniaScience, 2013)

EN] Refrigeration is one of the technology sectors that has sufered the most changes in the last twenty years, because of the negative impact of the fuids used in the refrigeration cycles, i.e., refrigerants, due to ...
Comparative evaluation of the intermediate systems employed in two-stage refrigeration cycles driven by compound compressors

Cabello, R.; Torrella Alcaraz, Enrique; Llopis, R.; Sanchez, D. (Elsevier, 2010)

[EN] This work presents an experimental evaluation, from an energy analysis point of view, for two of the most used inter-stage systems in two-stage vapour compression cycles driven by compound compressors: the direct ...
Development and validation of a finite element model for water - CO2 coaxial gas-coolers

Sanchez, D.; Cabello, R.; Llopis, R.; Torrella Alcaraz, Enrique (Elsevier, 2012-05)

The gas-cooler heat exchanger is a characteristic device of the refrigeration plants that use CO2 as the working fluid in transcritical conditions. The proper gas-cooler sizing, allows getting the maximum effectiveness in ...
Diseño de una caldera de vapor de lecho fluidizado policombustible de 1.25 MW

Pérez Sansano, Jorge (Universitat Politècnica de València, 2017-10-03)

Proyecto confidencial (Riunet)
Energetic evaluation of a CO2 refrigeration plant working in supercritical and subcritical conditions

Sánchez, Daniel; Patiño, Jorge; Sanz Kock, Carlos; Llopis, Rodrigo; Cabello, Ramón; Torrella Alcaraz, Enrique (Elsevier, 2014-05)

Unlike other refrigerants, R744 (or carbon dioxide) has a very low critical temperature (30.98 C) which hampers working in subcritical conditions especially when the environment is used as a heat rejection sink. ...
Energetic evaluation of an internal heat exchanger in a CO2 transcritical refrigeration plant using experimental data

Torrella Alcaraz, Enrique; Sanchez, D.; Llopis, R.; Cabello, R. (ELSEVIER SCI LTD, 2011)

[EN] The performance of an Internal Heat Exchanger (IHX) operating in a CO 2 transcritical refrigeration plant is analysed, from an energetic point of view, in this work. The evaluation is based on experimental data by ...
Energy and environmental comparison of two-stage solutions for commercial refrigeration at low temperature: Fluids and systems

Llopis, Rodrigo; Sánchez, Daniel; Sanz Kock, Carlos; Cabello, Ramón; Torrella Alcaraz, Enrique (Elsevier, 2015-01-15)

International agreements will restrict in the near future the use of high-GWP refrigerants in Europe. These restrictions will favour the implantation of refrigeration systems with low-GWP fluids, especially in applications ...
Energy improvements of CO2 transcritical refrigeration cycles using dedicated mechanical subcooling

Llopis Doménech, Rodrigo; Cabello, Ramon; Sanchez, Daniel; Torrella Alcaraz, Enrique (Elsevier, 2015)

[EN] In this work the possibilities of enhancing the energy performance of CO2 transcritical refrigeration systems using a dedicated mechanical subcooling cycle are analysed theoretically. Using simplified models of the ...
Energy influence of the IHX with R22 drop-in and long-term substitutes in refrigeration plants

Cabello, R.; Torrella Alcaraz, Enrique; Llopis, R.; Sanchez, D.; Larumbe, J.A. (Elsevier, 2013-01-10)

This work focuses on the investigation of new drop-in or long-term refrigerants for low evaporating temperatures that can be used as substitutes for HCFC-22, which is gradually being phased-out. This process is already ...
Evaluación experimental de una planta frigorífica de doble etapa de compresión trabajando con un compresor compound. Análisis de los efectos de desrecalentamiento y subenfriamiento utilizando como fluido de trabajo el HFC-404A

Llopis Doménech, Rodrigo (Universitat Politècnica de València, 2008-09-10)

El elevado impacto sobre el Medio Ambiente del sector de la producción de frío ha impulsado el uso y desarrollo de métodos de refrigeración cada vez más eficientes desde el punto de vista energético. Dentro de estos métodos ...