Energy performance evaluation of R1234yf, R1234ze(E), R600a, R290 and R152a as low-GWP R134a alternatives

Sánchez, Daniel; Cabello, R.; Llopis, Rodrigo; Arauzo, Inmaculada; Catalán‐Gil, Jesús; Torrella, E.

doi:10.1016/j.ijrefrig.2016.09.020

Cited by 260 publications

(93 citation statements)

References 20 publications

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“…It consists, as shown in Figure 4, of four main elements: the compressor, the condenser, the evaporator and the expansion valve. The chosen refrigerant is R290, which is a natural refrigerant already established as an alternative to traditional refrigerant such as R410a and R407c (Sánchez et al, 2017). The model for the condenser and evaporator is, similarly for the evaporator and condenser of the adsorption unit, made up of two sub-models, for the heat exchange of the HTF and the equilibrium model for the phase change of the refrigerant.…”

Section: Model Of the Electric Vapour Compression Chillermentioning

confidence: 99%

Experimentally Validated Dynamic Model for a Hybrid Cascade System for Solar Heating and Cooling Applications

Palomba¹,

Frazzica²,

Kühnert³

et al. 2018

Proceedings of EuroSun 2018

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This paper presents the dynamic modelling of a hybrid cascade chiller for solar cooling in industrial applications driven by Fresnel solar thermal collectors. The chiller comprises an adsorption module, which is directly connected to the bottoming vapor compression chiller. This cascade configuration allows enhancing the overall electric COP, since the adsorption module is operated to dissipate the heat rejected by the vapor compression chiller, thus reducing the condensation temperature quite below the ambient temperature. The model was implemented in Dymola/Modelica, allowing describing heat and mass transfer phenomena inside each component. The complete model was then validated against experimental data obtained on a cascade chiller prototype at the CNR ITAE lab. Finally, a reference daily simulation was performed to evaluate the ability of the developed chiller in providing cooling energy to a typical industrial application.

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Section: Model Of the Electric Vapour Compression Chillermentioning

confidence: 99%

Experimentally Validated Dynamic Model for a Hybrid Cascade System for Solar Heating and Cooling Applications

Palomba¹,

Frazzica²,

Kühnert³

et al. 2018

Proceedings of EuroSun 2018

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“…The results also showed that the COP of the mixture decreased to 1.5% compared to R134a [40]. Different HFC and HFO refrigerants were analyzed experimentally by using a hermetic compressor under the same working conditions, and it was shown that R290 achieved the best results for cooling capacity and the COP and R152a showed average reduction in cooling capacity and power consumed by compressor; hence, the COP was increased by 1-4.8% [41]. R1234yf and R1234ze(E) were analyzed experimentally as potential replacements for R134 by using a vending machine and two ambient temperatures of 32.2 and 40.5 • C; the results showed that R1234yf showed the closest performance to R134a compared to R1234ze(E) [42].…”

Section: Introductionmentioning

confidence: 96%

Thermodynamic Performance Analysis of Hydrofluoroolefins (HFO) Refrigerants in Commercial Air-Conditioning Systems for Sustainable Environment

et al. 2020

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Global warming is one of most severe environmental concerns that our planet is facing today. One of its causes is the previous generation of refrigerants that, upon release, remain in the atmosphere for longer periods and contribute towards global warming. This issue could potentially be solved by replacing the previous generation's high global warming potential (GWP) refrigerants with environmentally friendly refrigerants. This scenario requires an analysis of new refrigerants for a comparison of the thermodynamic properties of the previously used refrigerants. In the present research, a numerical study was conducted to analyze the thermodynamic performance of specifically low GWP hydrofluoroolefens (HFO) refrigerants for an actual vapor compression refrigeration cycle (VCRC) with a constant degree of 3 K superheat. The output parameters included the refrigeration effect, compressor work input, the coefficient of performance (COP), and the volumetric refrigeration capacity (VRC), all of which were calculated by varying the condenser pressure from 6 to 12 bars and vapor pressure from 0.7 to 1.9 bars. Results showed that R1234ze(Z) clearly possessed the desired thermodynamic performance. The drop in refrigeration effect for R1234ze(Z) was merely 14.6% less than that of R134a at a 12 bar condenser pressure; this was minimum drop among candidate refrigerants. The drop in the COP was the minimum for R1234ze(Z)-5.1% less than that of R134a at a 9 bar condenser pressure and 4.7% less than that of R134a at a 1.9 bar evaporator pressure, whereas the COP values of the other refrigerants dropped more drastically at higher condenser pressures. R1234ze(Z) possessed favorable thermodynamic characteristics, with a GWP of 7, and it can serve as an alternative refrigerant for refrigeration systems for a sustainable environment.

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“…A theoretical analysis dealing with the redesign of the evaporator circuitry and dimension was carried out finding that the efficiency of the system may increase, reaching the baseline values, with an optimized heat exchanger. Sánchez et al (2017) experimentally compared six different refrigerants in a direct drop-in application in a water-to-water system and, among them, R134a, R1234yf and R1234ze(E) were considered. They considered two evaporating temperatures, namely −10 • C and 0 • C, and three condensing temperatures, namely 25 • C, 35 • C and 45 • C, finding that the cooling capacity and the COP of the system using R1234yf…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of the use of R1234yf and R1234ze(E) as drop-in alternatives of R134a in a water-to-water heat pump

Colombo

Lucchini

Molinaroli

2020

International Journal of Refrigeration

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In the present paper, the experimental results of the use of R1234yf and R1234ze(E) as dropin alternatives of R134a in a water-to-water heat pump are discussed. The heat pump is firstly tested with R134a, to establish the baseline performance, and, then, is tested with the two abovementioned refrigerants considering the same compressor shaft rotational frequency and the same outlet temperatures of the secondary fluids from the evaporator and the condenser. The obtained results show that, compared to the R134a, the use of R1234yf leads to a reduction of the heating capacity and of the COP up to 9.80% and 7.39% respectively, whereas with the use of R1234ze(E) the capacity reduction achieves a maximum of 33.82% while a COP variation in the range −12.27% to +4.32% is found. A second group of tests is carried out varying the rotational frequency of the compressor shaft with the aim of matching the baseline R134a heating capacity. The results indicate an increase in the shaft rotational frequency up to 16% with R1234yf and up to 50% with R1234ze(E) which, however, leads to a maximum reduction of the heat pump COP respectively equal to 7.38% and to 18.11%. SubscriptsCOMP compressor COND condenser EV AP evaporator or evaporating G water-ethylene glycol mixture INS T Instrumental IN inlet OUT outlet 2 R refrigerant S HAFT shaft S UP superheating W water

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Energy performance evaluation of R1234yf, R1234ze(E), R600a, R290 and R152a as low-GWP R134a alternatives

Cited by 260 publications

References 20 publications

Experimentally Validated Dynamic Model for a Hybrid Cascade System for Solar Heating and Cooling Applications

Experimentally Validated Dynamic Model for a Hybrid Cascade System for Solar Heating and Cooling Applications

Thermodynamic Performance Analysis of Hydrofluoroolefins (HFO) Refrigerants in Commercial Air-Conditioning Systems for Sustainable Environment

Experimental analysis of the use of R1234yf and R1234ze(E) as drop-in alternatives of R134a in a water-to-water heat pump

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