Isobaric Heat Capacity Measurements for R1234yf from 303 to 373 K and Pressures up to 12 MPa

Liu, Yu; Zhao, Xiaoming; Lv, Shaohua; He, Hanwei

doi:10.1021/acs.jced.6b00959

Cited by 27 publications

(20 citation statements)

References 20 publications

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“…Temperature T and pressure P range of the isobaric heat capacity c P measurements of R1234yf reported in this work (×); Liu et al (□); Gao et al (○); and Tanaka et al (Δ). Colors of the markers indicate the difference in c P compared to the EOS: green (<2%), blue (2–4%), and red (>4%).…”

Section: Introductionsupporting

confidence: 55%

“…In particular, the measurements by Gao et al provide a very good agreement with the EOS as determined by the average absolute deviation (AAD) of just 0.3% . However, the existing c P measurements of R1234yf at supercritical conditions show a higher AAD of 3.2%, indicating a much larger divergence from the EOS …”

Section: Introductionmentioning

confidence: 92%

“…Therefore, the development of accurate EOS for R1234yf requires reliable property measurements performed over a wide range of temperatures, pressures, and densities. Many thermophysical properties of R1234yf, including its critical properties, vapor pressures, speed of sound, heat capacities, and densities, have already been experimentally measured and were summarized by Richter et al and Liu et al …”

Section: Introductionmentioning

confidence: 99%

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Isobaric Heat Capacity Measurements of Supercritical R1234yf

2018

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R1234yf (2,3,3,3-tetrafluoropropene) is a low global warming potential (GWP) replacement for R134a, a fluid commonly used as a refrigerant in domestic and automotive air conditioning systems and as a working fluid in organic Rankine cycles. The use of R1234yf in energy conversion cycles requires an accurate determination of its thermophysical properties, including the isobaric heat capacity (c P). Using a custom-made flow calorimeter, experimental c P measurements of supercritical R1234yf were made at temperatures T = 373.15 to 413.5 K and absolute pressures P = 3.5 to 10 MPa. The experimental apparatus was calibrated using R134a to increase the measurement accuracy. The heat capacity measurements of R1234yf were compared to available published experimental data and to values obtained from a multiparameter equation of state (EOS). The measured c P values agreed well with the EOS, providing an average absolute deviation (AAD) of 1.6%.

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Section: Introductionsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Isobaric Heat Capacity Measurements of Supercritical R1234yf

2018

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“…The data of Gao et al (2014) also exhibit low scatter. On the other hand, the data of Tanaka et al (2010a), Liu et al (2017) and Lukawaski et al (2017), as well as the isochoric heat capacity data of Zhong et al (2018), deviate from the EOS by considerably larger amounts.…”

Section: Vapour-liquid Equilibriamentioning

confidence: 93%

Thermodynamic properties of hydrofluoroolefin (R1234yf and R1234ze(E)) refrigerant mixtures: Density, vapour-liquid equilibrium, and heat capacity data and modelling

Ghafri

Rowland

Akhfash

et al. 2019

International Journal of Refrigeration

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Liquid-phase and vapour-phase densities are reported for the binary refrigerant mixtures (R125 + R1234ze(E)), (R134a + R1234ze(E)), (R143a + R1234ze(E)), (R1234ze(E) + R1234yf), (R125 + R1234yf), (R143a + R1234yf) and (R125 + R152a). The measurements span temperatures from (252 to 294) K and pressures from (0.8 to 4.2) MPa. Vapour-liquid equilibria (VLE) and liquid isobaric heat capacities are also reported for some mixtures. These measurements and previously published data were used to tune binary interaction parameters in existing Helmholtz energy models. Significant improvements in the predicted densities were achieved, for example the root mean squared relative deviation decreased from 0.33 % to 0.021 % for (R143a + R1234yf). The most significant improvement in the description of VLE occurred for (R1234yf + R1234ze(E)) where the root mean squared deviation in the predicted vapour phase compositions decreased from 0.010 to 0.00084 (a factor of 12).

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“…Simultaneously, the deviation of these two terms to some extent might cancel out when applying CPA. 25 and the data of R1234yf (c, d) are from Liu et al 5 and Gao et al 6 To illustrate the observed trends better, calculation results of (residual isobaric heat capacity given in Equation ( 3)) with method 3 for R1234yf and R1233zd(E) are presented in Figure 3.…”

Section: (I)mentioning

confidence: 96%

Modeling Hydrofluoroolefins with the Cubic Plus Association and Perturbed-Chain Statistical Associating Fluid Theory Equations of State

Kang

Wang

Kontogeorgis

2018

Ind. Eng. Chem. Res.

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Hydrofluoroolefins (HFOs) have been proposed as promising candidates for alternative refrigerants. In this work, a comprehensive comparison of the performance of the Cubic Plus Association (CPA) and (perturbed-chain statistical associating fluid theory) (PC-SAFT) equations of state for six thermodynamic properties of HFOs is presented, in which 11 parameter estimation methods are considered and analyzed. On the basis of the comparison with experimental data and a theoretical analysis, a method meeting both satisfactory results and simplicity is recommended for parameter estimation for this type of compounds. The results show that both CPA and PC-SAFT perform equally well for the prediction of vapor pressure, liquid density, and speed of sound in the gas phase. CPA provides better isobaric heat capacity predictions compared to PC-SAFT irrespectively of the estimation method used, but PC-SAFT presents the best overall performance when all properties are considered.

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Isobaric Heat Capacity Measurements for R1234yf from 303 to 373 K and Pressures up to 12 MPa

Cited by 27 publications

References 20 publications

Isobaric Heat Capacity Measurements of Supercritical R1234yf

Isobaric Heat Capacity Measurements of Supercritical R1234yf

Thermodynamic properties of hydrofluoroolefin (R1234yf and R1234ze(E)) refrigerant mixtures: Density, vapour-liquid equilibrium, and heat capacity data and modelling

Modeling Hydrofluoroolefins with the Cubic Plus Association and Perturbed-Chain Statistical Associating Fluid Theory Equations of State

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