Listar por autoría "ed6c9b15-2974-4143-9de5-d7758e19de1e"
Mostrando ítems 1-20 de 40
-
13th National and 4th International edition of the Conference on Engineering Thermodynamics: proceedings book
Cabello López, Ramón; Sánchez García-Vacas, Daniel; Nebot-Andres, Laura; Llopis, Rodrigo Universitat Jaume I (2023-12) -
A3 and A2 refrigerants: Border determination and hunt for A2 low-GWP blends
Calleja-Anta, Daniel; Nebot-Andres, Laura; Cabello López, Ramón; Sánchez García-Vacas, Daniel; Llopis, Rodrigo Elsevier Ltd. (2021-11-26)The hunt for new refrigerant blends has been concentrated to locate A1 refrigerants. However, the investigation for A2 or A2L blends to replace hydrocarbons (A3) has not attracted attention yet, although these mixtures ... -
Alternative blends of CO2 for transcritical refrigeration systems. Experimental approach and energy analysis
Sánchez García-Vacas, Daniel; Vidan-Falomir, Francisco; Nebot-Andres, Laura; Llopis, Rodrigo; Cabello López, Ramón Elsevier (2023-02-10)As a natural refrigerant, Carbon Dioxide (CO2) has been extended in almost all refrigeration fields due to its environmental friendliness, high availability, and high technological development in the main components of the ... -
Análisis y comparativa de sistemas de subenfriamiento en sistemas de refrigeración de CO2 en climas cálidos
Nebot-Andres, Laura Universitat Jaume I (2017-10-27)La refrigeración con ciclos de CO 2 simple está experimentando un fuerte cambio debido a las nuevas directivas europeas y los bajos rendimientos de estos sistemas en climas cálidos. Estudios teóricos ... -
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 ... -
Disseny i instal·lació d'un cicle de subrefredament mecànic per a la millora de l'eficiència energètica d'un clicle de CO2 transcrític
Nebot-Andres, Laura Universitat Jaume I (2015)Els cicles de refrigeració de CO2 transcrític no resulten completament eficients a altes temperatures. Estudis teòrics han demostrat que un cicle de subrefredament mecànic combinat al cicle transcrític pot augmentar el ... -
Drop-in substitutes for R-600a. Experimental evaluation and optimization of a commercial fridge
Calleja-Anta, Daniel; Nebot-Andres, Laura; Sánchez García-Vacas, Daniel; Cabello López, Ramón; Llopis, Rodrigo Elsevier (2022-07-05)This work aims to validate the hypothesis that refrigerant blends could allow energy savings in real refrigeration systems. For that purpose, five selected blends have been evaluated as drop-in substitutes in a domestic ... -
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 a Low Temperature commercial refrigeration plant working with the new low-GWP blend R468A as drop-in of R404A
Cabello López, Ramón; Sánchez García-Vacas, Daniel; Llopis, Rodrigo; Nebot-Andres, Laura; Calleja-Anta, Daniel Elsevier (2021-01-20)This work analyses experimentally the energy behaviour of a centralized commercial refrigeration plant designed to be used with R404A (GWP100=3,943) at low temperatures, when it is replaced with the new low-GWP refrigerant ... -
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 performance assessment of an auto-cascade cycle for ultra-low temperatures with the pair R1150 - R600a
Llopis, Rodrigo; Martínez Ángeles, Manel; Calleja-Anta, Daniel; Nebot-Andres, Laura Elsevier (2024-03-01) -
Evaluation of CO2-doped blends in single-stage with IHX and parallel compression refrigeration architectures
Martínez Ángeles, Manel; Sicco, Estefanía; Toffoletti, Gabriele; Nebot-Andres, Laura; Sánchez García-Vacas, Daniel; Cabello López, Ramón; CORTELLA, Giovanni; Llopis, Rodrigo Elsevier (2023-07)CO2 is the standard for medium to large-sized commercial applications, as it combines security and low environmental impact. However, it requires the use of advanced and complex cycles. Recently, CO2-doping (the addition ... -
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 ...