Listar EMC_Articles por autoría "51694fef-dad3-49e2-aa03-6ca577eb9529"
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Experimental enhancement of a CO2 transcritical refrigerating plant including thermoelectric subcooling
Sánchez García-Vacas, Daniel; Aranguren, Patricia; Llopis, Rodrigo; Cabello López, Ramón; Astrain, David; Casi, Álvaro Elsevier (2020-09-02)CO2 is an excellent natural refrigerant that can be used in almost any commercial cooling application thanks to its useful range of evaporative temperatures and excellent environmental properties. However, due to its low ... -
Experimental evaluation of a CO2 transcritical refrigeration plant with dedicated mechanical subcooling
Llopis, Rodrigo; Nebot-Andres, Laura; Cabello López, Ramón; Sánchez García-Vacas, Daniel; Catalán-Gil, Jesús Elsevier (2016-09)CO2 transcritical refrigeration cycles require optimization to reach the performance of conventional solutions at high ambient temperatures. Theoretical studies demonstrated that the combination of a transcritical cycle ... -
Experimental evaluation of a R134a/CO2 cascade refrigeration plant
Sanz Kock, Carlos; Llopis, Rodrigo; Sánchez García-Vacas, Daniel; Cabello López, Ramón; Torrella Alcaraz, Enrique Elsevier (2014)We present the experimental evaluation of a R134a/CO2 cascade refrigeration plant designed for low evaporation temperature in commercial refrigeration applications. The test bench incorporates two single- stage vapour ... -
Experimental evaluation of a transcritical CO2 refrigeration facility working with an internal heat exchanger and a thermoelectric subcooler: Performance assessment and comparative
Casi, Álvaro; Aranguren, Patricia; Araiz, Miguel; Sánchez García-Vacas, Daniel; Cabello López, Ramón; Astrain, David Elsevier (2022-08-01)The use of carbon dioxide in transcritical state has become one of the most used solutions to comply with the F-Gas directive and reduce greenhouse gases emissions from refrigeration systems at high ambient temperatures. ... -
Experimental evaluation of an Internal Heat Exchanger in a CO2 subcritical refrigeration cycle with gas-cooler
Llopis, Rodrigo; Sanz Kock, Carlos; Cabello López, Ramón; Sánchez García-Vacas, Daniel; Torrella Alcaraz, Enrique Elsevier (2015-04-05)We present the experimental evaluation of an internal heat exchanger or suction-line/liquid-line heat exchanger in a CO2 subcritical refrigeration plant with gas-cooler. The plant, driven by a 1.5kW CO2 semi hermetic ... -
Experimental evaluation of HCFC-22 replacement by the drop-in fluids HFC-422A and HFC-417B for low temperature refrigeration applications
Llopis, Rodrigo; Cabello López, Ramón; Sánchez García-Vacas, Daniel; Torrella Alcaraz, Enrique; Patiño Pérez, Jorge; Sánchez, 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 CO2-based mixtures CO2/R32, CO2/R1234yf and CO2/R1270 in a transcritical refrigerating plant considering the effect of the internal heat exchanger (IHX)
Sánchez García-Vacas, Daniel; Larrondo Sancho, Rafael; Vidan-Falomir, Francisco; Cabello López, Ramón Elsevier (2024-01-05)Using CO2 mixtures results in a simple but effective solution to increase the critical temperature of CO2 and reduce its working pressures. However, the overall effect of these mixtures on the global performance of the ... -
Experimental evaluation of the desuperheater influence in a CO2 booster refrigeration facility
Catalán-Gil, Jesús; Sánchez García-Vacas, Daniel; Cabello López, Ramón; Llopis, Rodrigo; Nebot-Andres, Laura; Calleja-Anta, Daniel Elsevier (2020-03-05)Commercial refrigeration has undergone significant changes in recent years. In the European market, this is mainly due to the F-Gas Regulation (EU 517/2014). F-Gas affects in great measure to commercial centralized ... -
Experimental evaluation of the energy efficiency of a CO2 refrigerating plant working in transcritical conditions
Cabello López, Ramón; Sánchez García-Vacas, Daniel; Llopis, Rodrigo; Torrella Alcaraz, Enrique (2008)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. The ... -
Experimental Evaluation of the Energy Performance of an Air Vortex Tube when the Inlet Parameters are Varied
Torrella Alcaraz, Enrique; Patiño Pérez, Jorge; Sánchez García-Vacas, Daniel; Llopis, Rodrigo; Cabello López, Ramón Bentham Open (2013)he paper presents the analysis of the energy performance of an air vortex cooling tube under variations of the air inlet properties, with t hree independent experimental tests validated through the energy balance ... -
Experimental evaluation of the inter-stage conditions of a two-stage refrigeration cycle using a compound compressor
Torrella Alcaraz, Enrique; Llopis, Rodrigo; Cabello López, Ramón Elsevier (2009)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 with ... -
Experimental validation and development of an advanced computational model of a transcritical carbon dioxide vapour compression cycle with a thermoelectric subcooling system
Casi, Álvaro; Aranguren, Patricia; Sánchez García-Vacas, Daniel; Araiz, Miguel; Cabello López, Ramón; Astrain, David Elsevier Ltd. (2022-01-23)The inclusion of a thermoelectric subcooler as an alternative to increment the performance of a vapour compression cycle has been proved promising when properly designed and operated for low-medium power units. In this ... -
Flat plate solar collector performance using alumina nanofluids: Experimental characterization and efficiency tests
Mondragon, Rosa; Sánchez García-Vacas, Daniel; Cabello López, Ramón; Llopis, Rodrigo; Juliá, J. Enrique Public Library of Science (2019)Solar energy has become an important renewable energy source for reducing the use of fossil fuels and to mitigate global warming, for which solar collectors constitute a technology that is to be promoted. The use of ... -
HCFC-22 replacement with drop-in and retrofit HFC refrigernants ina a two-stage refrigeration plant for low temperature
Sánchez García-Vacas, Daniel; Cabello López, Ramón; Llopis, Rodrigo; Torrella Alcaraz, Enrique Elsevier (2012)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 already ... -
Improvements in CO2 Booster Architectures with Different Economizer Arrangements.
Catalán-Gil, Jesús; Nebot-Andres, Laura; Sánchez García-Vacas, Daniel; Llopis, Rodrigo; Cabello López, Ramón; Calleja-Anta, Daniel MDPI (2020-03-09)CO2 transcritical booster architectures are widely analyzed to be applied in centralized commercial refrigeration plants in consonance with the irrevocable phase-out of HFCs. Most of these analyses show the limitations ... -
Improvements in the cooling capacity and the COP of a transcritical CO2 refrigeration plant operating with a thermoelectric subcooling system
Astrain, David; Merino, A.; Catalán, L.; Aranguren, Patricia; Araiz, Miguel; Sánchez García-Vacas, Daniel; Cabello López, Ramón; Llopis, Rodrigo Elsevier (2019-06-05)Restrictive environmental regulations are driving the use of CO2 as working fluid in commercial vapour compression plants due to its ultra-low global warming potential (GWP100 = 1) and its natural condition. However, at ... -
Influence of the superheat associated to a semihermetic compressor of a transcritical CO<sub>2</sub> refrigeration plant
Sánchez García-Vacas, Daniel; Torrella Alcaraz, Enrique; Cabello López, Ramón; Llopis, Rodrigo Elsevier (2010)This work evaluates, from an energetic point of view, the effects of the superheat caused in the refrigerant by the electric motor cooling (SH<sub>SC</sub>) in a semihermetic compressor installed in an experimental ... -
Las máquinas de producción de frío por adsorción con la mezcla sílica gel-agua
Torrella Alcaraz, Enrique; Sánchez García-Vacas, Daniel; Cabello López, Ramón; Patiño Pérez, Jorge; Llopis, Rodrigo Reed Business Information (2011)El objetivo del trabajo es presentar una revisión de las máquinas frigoríficas tritérmicas le adsorción,con mencIón especial en las que trabajan con la mezcla silicagel (o gel de sílice) – agua. La estructura seguida se ... -
New positions for an internal heat exchanger in a CO2 supercritical refrigeration plant. Experimental analysis and energetic evaluation
Sánchez García-Vacas, Daniel; Patiño Pérez, Jorge; Llopis, Rodrigo; Cabello López, Ramón; Torrella Alcaraz, Enrique; Vicente Fuertes, Fernando Elsevier (2014-02)IHX is probably, one of the most commonly alternative used to improve cooling capacity and COP in a CO2 refrigerating plant working in supercritical conditions. The “classical” position at gas-cooler exit has been analyzed ... -
On-site real-time evaluation of an air-conditioning direct-fired double-effect absorption chiller
Torrella Alcaraz, Enrique; Sánchez García-Vacas, Daniel; Cabello López, Ramón; Larumbe, J. A.; Llopis, Rodrigo Elsevier (2009)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 ...