Listar Departament: Enginyeria Mecànica i Construcció por autoría "d113169a-52b5-4f4e-b0e2-f9490716ae3f"
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CO2 with Mechanical Subcooling vs. CO2 Cascade Cycles for Medium Temperature Commercial Refrigeration Applications Thermodynamic Analysis
Nebot-Andres, Laura; Llopis, Rodrigo; Sánchez García-Vacas, Daniel; Catalán-Gil, Jesús; Cabello López, Ramón MDPI (2017-09)A recent trend to spread the use of CO2 refrigeration cycles in warm regions of the world is to combine a CO2 cycle with another one using a high performance refrigerant. Two alternatives are being considered: cascade and ... -
Conversion of a direct to an indirect commercial (HFC134a/CO2) cascade refrigeration system: Energy impact analysis
Sánchez García-Vacas, Daniel; Llopis, Rodrigo; Cabello López, Ramón; Catalán-Gil, Jesús; Nebot-Andres, Laura Elsevier (2017)Energy impact of conversion of a direct HFC134a/CO2 cascade refrigeration system to an indirect HFC134a-secondary fluid / CO2 cascade for commercial applications is experimentally analysed. Refrigeration systems, fully ... -
Conversion of a Direct to an Indirect Refrigeration System at Medium Temperature Using R-134a and R-507A: An Energy Impact Analysis
Llopis, Rodrigo; Sánchez García-Vacas, Daniel; Cabello López, Ramón; Catalán-Gil, Jesús; Nebot-Andres, Laura MDPI (2018-02-06)This work presents the experimental evaluation of energy consumption and refrigerant charge reduction when a commercial direct expansion refrigeration system is converted into an indirect system. The evaluation (with R-134a ... -
Effects caused by the internal heat exchanger at the low temperature cycle in a cascade refrigeration plant
Llopis, Rodrigo; Sanz Kock, Carlos; Cabello López, Ramón; Sánchez García-Vacas, Daniel; Nebot-Andres, Laura; Catalán-Gil, Jesús Elsevier (2016)This work analyses and quantifies the effects caused by the use of an internal heat exchanger (IHX) at the CO2 subcritical cycle in an HFC134a/CO2 cascade refrigeration plant that incorporates a gas-cooler at the exit ... -
Energy analysis of dedicated and integrated mechanical subcooled CO2 boosters for supermarket applications
Catalán-Gil, Jesús; Llopis, Rodrigo; Sánchez García-Vacas, Daniel; Nebot-Andres, Laura; Cabello López, Ramón Elsevier (2019-03)Energy improvements offered by dedicated and integrated mechanical subcooling systems in CO2 booster systems for supermarket applications are analyzed here through the use of thermodynamic models close to reality. Using a ... -
Energy assessment and environmental impact analysis of an R134a/R744 cascade refrigeration plant upgraded with the low-GWP refrigerants R152a, R1234ze(E), propane (R290) and propylene (R1270)
Sánchez García-Vacas, Daniel; Cabello López, Ramón; Llopis, Rodrigo; Catalán-Gil, Jesús; Nebot-Andres, Laura Elsevier (2019-05-23)The European limitations associated with the use of fluorinated refrigerants have affected one of the most extended solutions used in commercial refrigeration in warm countries. Traditional cascade systems with R404A or ... -
Energy assessment of an R134a refrigeration plant upgraded to an indirect system using R152a and R1234ze(E) as refrigerants
Sánchez García-Vacas, Daniel; Cabello López, Ramón; Llopis, Rodrigo; Catalán-Gil, Jesús; Nebot-Andres, Laura Elsevier (2018-07-05)In this work the experimental results obtained from a direct expansion refrigerating plant converted into an indirect plant, are presented and discussed in terms of energy consumption for a commercial refrigerating unit ... -
Energy Evaluation of Multiple Stage Commercial Refrigeration Architectures Adapted to F-Gas Regulation
Catalán-Gil, Jesús; Sánchez García-Vacas, Daniel; Llopis, Rodrigo; Nebot-Andres, Laura; Cabello López, Ramón MDPI (2018-07-23)This work analyses different refrigeration architectures for commercial refrigeration providing service to medium and low temperature simultaneously: HFC/R744 cascade, R744 transcritical booster, R744 transcritical ... -
Energy evaluation of R152a as drop in replacement for R134a in cascade refrigeration plants
Cabello López, Ramón; Sánchez García-Vacas, Daniel; Llopis, Rodrigo; Catalán-Gil, Jesús; Nebot-Andres, Laura; Torrella Alcaraz, Enrique Elsevier (2017-01)An experimental comparison has been performed of a cascade refrigeration facility working with the refrigerant pairs R134a/R744 and R152a/R744. This kind of facility is suitable for industrial and commercial refrigeration ... -
Energy perfomance evaluation of R1234YF, R1234ze (E), R6600a, R290 and R152a as low-GWP R134a alternatives
Sánchez García-Vacas, Daniel; Cabello López, Ramón; Llopis, Rodrigo; Arauzo Pérez, Ivan; Catalán-Gil, Jesús; Torrella Alcaraz, Enrique Elsevier (2017-02)In 2014, the Directive 517/2014 was introduced by European Parliament to reduce the use of high-GWP greenhouse gases in the European area in order to limit global climate change in accordance with the objectives marked by ... -
Experimental Analysis and Optimization of an R744 Transcritical Cycle Working with a Mechanical Subcooling System
Sánchez García-Vacas, Daniel; Catalán-Gil, Jesús; Cabello López, Ramón; Calleja-Anta, Daniel; Llopis, Rodrigo; Nebot-Andres, Laura MDPI (2020-06-19)In the last century, the refrigerant R744 (carbon dioxide) has become an environmentally friendly solution in commercial refrigeration despite its particular issues related to the low critical temperature. The use of ... -
Experimental analysis of R-450A and R-513A as replacements of R-134a and R-507A in a medium temperature commercial refrigeration system
Llopis, Rodrigo; Sánchez García-Vacas, Daniel; Cabello López, Ramón; Catalán-Gil, Jesús; Nebot-Andres, Laura Elsevier (2017-09)This work presents the experimental evaluation of R-513A (GWP = 573) and R-450A (GWP = 547) as R-134a (GWP = 1301) drop-in replacements and as R-507A (GWP = 3987) retrofits in a commercial direct expansion refrigeration ... -
Experimental determination of the optimum working conditions of a transcritical CO2 refrigeration plant with integrated mechanical subcooling
Nebot-Andres, Laura; Catalán-Gil, Jesús; Sánchez García-Vacas, Daniel; Calleja-Anta, Daniel; Cabello López, Ramón; Llopis, Rodrigo Elsevier (2020-02-05)Subcooling methods for transcritical CO2 plants are being studied in order to improve their behavior. Among them, the Integrated Mechanical Subcooling system is one of the most promising owing that performs with high ... -
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 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 ... -
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 ... -
R-407H as drop-in of R-404A. Experimental analysis in a low temperature direct expansion commercial refrigeration system
Llopis, Rodrigo; Sánchez García-Vacas, Daniel; Cabello López, Ramón; Nebot-Andres, Laura; Catalán-Gil, Jesús Elsevier (2017-08)This work analyses experimentally the possibility of using the reduced GWP refrigerant R-407H (HFC family, GWP = 1378) as drop-in substitute of R-404A (HFC family, GWP = 3945) in low temperature centralized direct expansion ... -
R-454C, R-459B, R-457A and R-455A as low-GWP replacements of R-404A: Experimental evaluation and optimization
Llopis, Rodrigo; Calleja-Anta, Daniel; Sánchez García-Vacas, Daniel; Nebot-Andres, Laura; Catalán-Gil, Jesús; Cabello López, Ramón Elsevier (2019-06-12)This work evaluates R-454C, R-459B, R-457A and R-455A as R-404A low-GWP substitutes in a stand-alone commercial refrigeration system for fresh product under ISO 23953-2. System is tested with and without receiver. Charge ... -
Subcooling methods for CO 2 refrigeration cycles: A review
Llopis, Rodrigo; Nebot-Andres, Laura; Sánchez García-Vacas, Daniel; Catalán-Gil, Jesús; Cabello López, Ramón Elsevier (2018-09)CO2 subcooling has resulted a method to upgrade the performance of CO2 refrigeration plants in the recent years, with overall improvements up to 12% with internal heat exchangers, 22% with economizers, 25.6% with thermoelectric ... -
Thermodynamic screening of alternative refrigerants for R290 and R600a
Calleja-Anta, Daniel; Nebot-Andres, Laura; Catalán-Gil, Jesús; Sánchez García-Vacas, Daniel; Cabello López, Ramón; Llopis, Rodrigo Elsevier (2020)Due to Regulation EU 517/2014 (F-Gas), the use of refrigerants with GWP higher than 150 was limited from 2015 on in small capacity refrigeration systems in Europe. Although refrigerants that dominate are R600a and R290 ...