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Browsing by Author "Cabello, R."

Now showing items 1-20 of 24

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, ...
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 ...
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 ...
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 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 ...
Experimental comparison between R152a and R134a working in a refrigeration facility equipped with a hermetic compressor

Cabello, R.; Sanchez, D.; Llopis Doménech, Rodrigo; Armendáriz Araúzo, Luis Miguel; Torrella Alcaraz, Enrique (Elsevier, 2015)

[EN] The EU Regulation 517/2014 has recently been approved in a further attempt to curb the effects of GlobalWarming. As a consequence, the refrigeration sector is moving towards refrigerants with a low GlobalWarming ...
Experimental energetic analysis of the subcooler system in a two-stage refrigeration facility driven by a compound compressor

Torrella Alcaraz, Enrique; Llopis, R.; Cabello, R.; Sanchez, D. (Taylor & Francis, 2009)

[EN] This paper presents a detailed experimental analysis of the energetic effects of using a subcooler system in a two-stage refrigeration facility driven by a compound compressor. The analysis is carried out by comparing ...
Experimental evaluation of HCFC-22 replacement by the drop-in fluids HFC-422A and HFC-417B for low temperature refrigeration applications

Llopis, R.; Cabello, R.; Sanchez, D.; Torrella Alcaraz, Enrique; Patino, J.; Sanchez, J. G. (Elsevier, 2011-05)

The Regulation CE-1005/2009 has banned the use of virgin HCFC-22 in Europe from the 31st December 2009, because it contains chlorine, although its use is allowed up to the 31st December 2014 if it is recycled. Now, ...
Experimental evaluation of the energy efficiency of a CO2 refrigerating plant working in transcritical conditions

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

[EN] This work presents the experimental evaluation of the energy efficiency and optimal gas-cooler pressures of a single-stage refrigerating plant working with carbon dioxide as refrigerant in transcritical conditions. ...
Experimental evaluation of the energy performance of an air vortex tube when the inlet parameters are varied

Torrella Alcaraz, Enrique; Patiño, J.; Sánchez, D.; Llopis, R.; Cabello, R. (Bentham Open, 2013)

The paper presents the analysis of the energy performance of an air vortex cooling tube under variations of the air inlet properties, with three independent experimental tests validated through the energy balance in the ...
Experimental evaluation of the inter-stage conditions of a two-stage refrigeration cycle using a compound compressor

Torrella Alcaraz, Enrique; Llopis, R.; Cabello, R. (Elsevier, 2009)

[EN] The aim of the present paper is to detail an analysis, based on experimental data, of the inter-stage working conditions of a two-stage vapour compression facility equipped with a compound compressor, which operates ...
HCFC-22 replacement with drop-in and retrofit HFC refrigerants in a two-stage refrigeration plant for low temperature

Llopis, R.; Torrella Alcaraz, Enrique; Cabello, R.; Sanchez, D. (ELSEVIER SCI LTD, 2012)

[EN] The world community has committed to eliminate the HCFC-22 refrigerant to a series of deadlines according to the agreements taken during the 19th Montreal Protocol meeting in September 2007. This phase-out, which is ...
Influence of the superheat associated to a semihermetic compressor of a transcritical CO2 refrigeration plant

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

[EN] This work evaluates, from an energetic point of view. the effects of the superheat caused in the refrigerant by the electric motor cooling (SHsc) in a semihermetic compressor installed in an experimental refrigerating ...
Las máquinas de producción de frío por adsorción con la mezcla sílica gel-agua

Torrella Alcaraz, Enrique; Sánchez, D.; Cabello, R.; Patiño, J.; Llopis, R. (ALCION, 2011)

[ES] El objetivo delt rabajo es presentar una revisión de las máquinas frigoríficas tritérmicas de adsorción, con mención especial en las que trabajan con la mezcla silicagel (o gel de sílice)-agua. La estructura seguida ...
On-site real-time evaluation of an air-conditioning direct-fired double-effect absorption chiller

Torrella Alcaraz, Enrique; Sánchez, D.; Cabello, R.; Larumbe Bernad, Juan Antonio; Llopis, R. (Elsevier, 2009)

[EN] This work presents a procedure for calculating the COP and heat transfer rates, based on on-site experimental temperature measurements, of a lithium¿bromide/water direct-fired double-effect absorption chiller in reverse ...