Listar Departament: Enginyeria Mecànica i Construcció por autoría "748ec671-6036-4477-b1c1-e2323e0fdd4c"
Mostrando ítems 21-40 de 40
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Experimental assessment of dedicated and integrated mechanical subcooling systems vs parallel compression in transcritical CO2 refrigeration plants
Nebot-Andres, Laura; Calleja-Anta, Daniel; Sánchez García-Vacas, Daniel; Cabello López, Ramón; Llopis, Rodrigo Elsevier Ltd. (2022-01-15)Mechanical subcooling systems, both dedicated and integrated, have attracted lot of attention in the recent years due to their great potential to improve transcritical CO2 refrigeration systems. Numerous studies have ... -
Experimental assessment of different extraction points for the integrated mechanical subcooling system of a CO2 transcritical plant
Nebot-Andres, Laura; Calleja-Anta, Daniel; Fossi, Carlos; Sánchez García-Vacas, Daniel; Cabello López, Ramón; Llopis, Rodrigo Elsevier B.V. (2022-01-04)Subcooling systems are positioned in recent years as one of the best solutions to improve the efficiency of transcritical CO2 cycles. Specifically, the integrated mechanical subcooling cycle allows the improvement of these ... -
Experimental determination of the optimum intermediate and gas-cooler pressures of a commercial transcritical CO2 refrigeration plant with parallel compression
Nebot-Andres, Laura; Sánchez García-Vacas, Daniel; Calleja-Anta, Daniel; Cabello López, Ramón; Llopis, Rodrigo Elsevier (2021-05-05)CO2 systems used in refrigeration are becoming more complex with the aim of improving their energy performance. Parallel compression is one of the implemented solutions to enhance the performance of the plants. However, ... -
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 alternative CO2-based blends for transcritical refrigeration systems
Vidan-Falomir, Francisco; Larrondo Sancho, Rafael; Sánchez García-Vacas, Daniel; Martinez-Angeles, Manel E.; Calleja-Anta, Daniel; Nebot-Andres, Laura; Llopis, Rodrigo; Cabello López, Ramón International Institute of Refrigeration (IIR) (2023-08-21)This work presents two refrigerant CO2 blends with R32 and R1270 designed with a theoretically nonflammability and a GWP below 150. Both mixtures were tested in a small-capacity vapour compression system with and without ... -
Experimental evaluation of CO2/R-152a mixtures in arefrigeration plant with and without IHX
Sicco, Estefanía; Martínez Ángeles, Manel; Toffoletti, G.; Nebot-Andres, Laura; Sánchez García-Vacas, Daniel; Cabello López, Ramón; CORTELLA, Giovanni; Llopis, Rodrigo Elsevier Ltd (2024-03-01)In recent years, CO2-based mixtures have been considered as a way to improve the performance of refrigerating plants using pure CO2 as refrigerant. Combining CO2 with a fluid with higher critical temperature generates a ... -
Experimental evaluation of different refrigeration system configurations using CO2-based blends as refrigerants
Sicco, Emanuele; Martínez Angeles, Manel Enric; Toffoletti, Gabriele; Nebot-Andres, Laura; Sánchez García-Vacas, Daniel; CORTELLA, Giovanni; Llopis, Rodrigo International Institute of Refrigeration (IIR) (2023-08)Recently, blends created by mixing CO2 with another fluid with a higher critical temperature are being considered, to allow subcritical operation at high outdoor temperature, thus increasing the COP. The goal of this ... -
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 zeotropic refrigerants in a dedicated mechanical subcooling system in a CO2 cycle
Llopis, Rodrigo; Toffoletti, Gabriele; Nebot-Andres, Laura; CORTELLA, Giovanni Elsevier Ltd. (2021-05-21)Use of zeotropic blends in the dedicated mechanical subcooling system of a CO2 refrigeration system was suggested as a possible improvement due to matching of evaporating temperature with CO2 temperature profile during ... -
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 ... -
Improving efficiency of transcritical CO2 cycles through a magnetic refrigeration subcooling system
Nebot-Andres, Laura; Del Duca, Manuel Gesù; APREA, CIRO; Žerovnik, Andrej; Tušek, Jaka; Llopis, Rodrigo; Maiorino, Angelo Elsevier (2022-04-20)Subcooling methods for transcritical CO2 plants are being studied in order to improve the behaviour of these systems in hot climates, where basic configurations are not competitive enough. To achieve important improvements ... -
Optimizing R152a/R600 and R290/R600 mixtures for superior energy performance in vapor compression systems: Promising alternatives to Isobutane (R600a)
Calleja-Anta, Daniel; Martínez Ángeles, Manel; Nebot-Andres, Laura; Sánchez, Daniel; Llopis, Rodrigo Elsevier (2024-06-15)This study presents an experimental investigation into the optimal composition of R152a/R600 and R290/R600 mixtures as potential alternatives to isobutane (R600a) in a single-stage vapor compression cycle. The research ... -
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 ... -
TEWI analysis of a standalone refrigeration system using low-GWP fluids with leakage ratio consideration
Llopis, Rodrigo; Calleja-Anta, Daniel; Maiorino, Angelo; Nebot-Andres, Laura; Sánchez García-Vacas, Daniel Elsevier (2020-06-04)In few years, stand-alone systems will rely on low-GWP refrigerants in order to reduce their direct impact, which agrees with the recent regulations and standards. However, the energy performance of the system is dependent ... -
Thermodynamic Analysis of a CO2 Refrigeration Cycle with Integrated Mechanical Subcooling
Nebot-Andres, Laura; Calleja-Anta, Daniel; Sánchez García-Vacas, Daniel; Cabello López, Ramón; Llopis, Rodrigo MDPI (2020)Different alternatives are being studied nowadays in order to enhance the behavior of transcritical CO2 refrigeration plants. Among the most studied options, subcooling is one of the most analyzed methods in the last years, ... -
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 ... -
Vapour compression and caloric refrigeration in combination for a new hybrid refrigeration system
Nebot-Andres, Laura; Del Duca, Manuel Gesù; APREA, CIRO; Tušek, Jaka; Žerovnik, Andrej; Maiorino, Angelo International Institute of Refrigeration (IIR) (2023-08-21)Although caloric refrigeration systems, such as magnetic and elastocaloric ones have shown promising potential in the last decade, their application in stand-alone applications remains scarce. Namely, they can provide ...