Liquid viscosity of low-GWP refrigerant mixtures (R32+R1234yf) and (R125+R1234yf)

Dang, Yagu; Kamiaka, Takumi; Dang, Chaobin; Hihara, Eiji

doi:10.1016/j.jct.2015.05.009

Cited by 44 publications

(10 citation statements)

References 20 publications

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“…Tian et al [69] also proposed an R32/R290 (68/32%) mixture to replace R410A in RACs. The amount of refrigerant charge is [30,35]% lower than that of R410A, and the use of microchannel heat exchangers reaches a 34.1% lower charge and 6.8% higher COPc compared to typical heat exchangers.…”

Section: R32 Pure and Mixtures As Alternatives To R410amentioning

confidence: 95%

“…The AAD obtained in REFPROP v9.1 is approximately three times larger, 0.555%. The liquid viscosity measurements [30] of mixtures containing 30%, 50%, and 70% R32 were correlated using a hard sphere method and the Grunberg and Nissan method. The AADs are 2.2% for the hard sphere method, 2.8% for the Grunberg and Nissan method, and 3.5% for REFPROP v9.1.…”

Section: Thermophysical Properties Of R32 Blendsmentioning

confidence: 99%

See 1 more Smart Citation

Refrigerant R32 as lower GWP working fluid in residential air conditioning systems in Europe and the USA

Mota-Babiloni

Navarro-Esbrí

Makhnatch

et al. 2017

Renewable and Sustainable Energy Reviews

111

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Because air conditioning and heat pump systems contribute greatly to greenhouse gas emissions, equipment with both lower global warming potential (GWP) working fluids and a higher level of performance should be used. R32 (difluoromethane) has been proposed to substitute R410A, particularly in residential air conditioning (RAC) systems. This study collected the most relevant and recent researches into R32 as a refrigerant so as to assess its viability in RAC systems in both Europe and the USA, as compared to R410A and other lower GWP RAC alternatives.The R32 value of GWP is 677, which is below the F-gas regulation limit in RAC equipment (750). According to ASHRAE standard 34, R32 is less flammable than hydrocarbons, and the amount of charge permitted for R32 is above the necessary level in RAC equipment. It can be concluded that R32 has significantly good heat transfer characteristics and a level of performance that make it acceptable at low condensing temperatures, thereby avoiding overly high compressor discharge temperatures. Its performance is very similar to that of R410A across the entire operating range, and it is therefore believed that R32 will be utilized in RAC systems in the remaining countries that prioritize lower GWP fluids but are less strict in their security regulations.To replace R410A under extreme conditions, some system modifications can be conducted, or R32 mixtures with hydrofluoroolefins (HFOs) can be used. Such mixtures achieve a lower performance than R32, but are acceptable replacements when considering their lower GWP compared to that of R32, and similar level of flammability. Finally, other (R32-based) alternative mixtures have also been developed and their behaviours studied under a wide range of operating conditions.

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Section: R32 Pure and Mixtures As Alternatives To R410amentioning

confidence: 95%

Section: Thermophysical Properties Of R32 Blendsmentioning

confidence: 99%

Refrigerant R32 as lower GWP working fluid in residential air conditioning systems in Europe and the USA

Mota-Babiloni

Navarro-Esbrí

Makhnatch

et al. 2017

Renewable and Sustainable Energy Reviews

111

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“…R-32 + R-1234yf density deviations according to experimental data (○, Dang et al; △, Cai et al; ◁, Yang et al; ▽, Jia et al, ⎔, Tomassetti et al) after removing two-phase data and near-critical data.…”

Section: Modelsmentioning

confidence: 99%

Survey of Data and Models for Refrigerant Mixtures Containing Halogenated Olefins

et al. 2021

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We survey existing data for refrigerant blends containing halogenated olefins (hydrofluoroolefins (HFO), hydrochlorofluoroolefins (HCFO), and hydrochloroolefins (HCO)) in the open literature. The data are primarily taken from the NIST SOURCE database and are presented in graphical form to demonstrate the relative coverage of the data. The primary conclusion is that blends containing halogenated olefins remain only sparsely measured in experiments, and some classes of data (e.g., speed-of-sound data) are particularly sparse for blends containing halogenated olefins. The second part of this study compares the thermodynamic models in NIST REFPROP against the experimental data sets and identifies systems (of which there are many) for which refitting of the thermodynamic model is required.

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“…The experimental liquid viscosity data of mixtures based on R1234ze(E) and R1234yf in the published literature are summarized in Table with the techniques employed to perform the measurements, the temperature and pressure ranges, the number of data points, and the authors’ claimed uncertainty. It can be found that the experimental data of viscosity for some refrigerant mixtures containing R1234ze(E) or R1234yf have been measured in the past few years. − However, all of the measurements were made at relatively low pressure, except for the data of R32 + R1234ze(E) from Sun et al and the data of R32 + R1234yf from Meng et al, both of which reached a pressure of up to 30 MPa. In addition, the measured viscosity data for pressure and composition ranges are limited, which is insufficient for a modeling study.…”

Section: Introductionmentioning

confidence: 99%

Liquid Viscosity Measurements for the Binary and Ternary Refrigerant Mixtures of R134a, R1234ze(E), and R1234yf

et al. 2022

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The liquid viscosity measurements of three binary mixtures at nine compositions and one ternary mixture of R134a, R1234yf, and R1234ze(E) were conducted with a vibrating-wire viscometer in the temperature range of (273 to 353) K and at pressures of up to 15 MPa. The combined expanded uncertainty (k = 2) of the measurements was estimated to be 2.3%. Most of the relative deviations between the values from the REFPROP 10.0 and the experimental viscosities were within 2%. To predict the viscosity of the refrigerant mixtures, an extended hard-sphere (EHS) model combined with the mixing rules was developed. It is found that the viscosities for mixtures predicted by the model show good agreement with the experimental measurements, with the relative deviations being almost within 2%.

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Liquid viscosity of low-GWP refrigerant mixtures (R32+R1234yf) and (R125+R1234yf)

Cited by 44 publications

References 20 publications

Refrigerant R32 as lower GWP working fluid in residential air conditioning systems in Europe and the USA

Refrigerant R32 as lower GWP working fluid in residential air conditioning systems in Europe and the USA

Survey of Data and Models for Refrigerant Mixtures Containing Halogenated Olefins

Liquid Viscosity Measurements for the Binary and Ternary Refrigerant Mixtures of R134a, R1234ze(E), and R1234yf

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