Vapor–Liquid-Equilibrium (VLE) properties of R-32+R-134a system derived from isochoric measurements

Nicola, Giovanni Di; Giuliani, Giuliano; Passerini, G.; Polonara, Fabio; Stryjek, Roman

doi:10.1016/s0378-3812(98)00407-5

Cited by 32 publications

(35 citation statements)

References 14 publications

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“…The VLE of the R32 + R1234ze(E) binary mixture was assessed from the two-phase isochoric measurements using the “flash method” with three different EoSs. The Carnahan–Starling–De Santis (CSD) EoS was utilized in this method for VLE assessment as presented in a previous work . The following form of the CSD EoS was used where where R = 8.3145 J·mol –1 ·K –1 is the universal gas constant, v m is the molar volume, and a and b are the CSD parameters.…”

Section: Resultsmentioning

confidence: 99%

Two-Phase and Vapor-Phase Thermophysical Property (pvTz) Measurements of the Difluoromethane + trans-1,3,3,3-Tetrafluoroprop-1-ene Binary System

et al. 2020

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In this paper, 182 pvTz data (28 data in the two-phase region and 154 data in the superheated vapor region) of mixtures containing difluoromethane (R32) and trans-1,3,3,3-tetrafluoroprop-1-ene (R1234ze(E)) are reported. The measurements were carried out along 10 isochores (0.013173, 0.039422, 0.043115, 0.046522, 0.062966, 0.068225, 0.068959, 0.110447, 0.115156, and 0.121732 m3·kg–1) in the temperature range from 263 to 373 K for 10 R32 mole fractions (0.1677, 0.2360, 0.2551, 0.4634, 0.5374, 0.6715, 0.7383, 0.7544, 0.9532, and 0.9533). The flash method with three equations of state (EoSs) was used to assess the vapor–liquid equilibrium of the binary mixture under analysis. The calculated vapor–liquid equilibrium behavior for the R32 + R1234ze(E) binary system agreed with the experimental data collected from the open literature. The vapor-phase measurements were correlated through the aforementioned EoSs and a truncated virial EoS. These pvTz points agreed with both the values provided by the EoSs and REFPROP 10.0.

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Section: Resultsmentioning

confidence: 99%

Two-Phase and Vapor-Phase Thermophysical Property (pvTz) Measurements of the Difluoromethane + trans-1,3,3,3-Tetrafluoroprop-1-ene Binary System

et al. 2020

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“…Two methods were used to derive VLE data from the isochoric measurements, as reported elsewhere [6]. In the first method, the VLE parameters were derived using the "dew point" method in combination with the CSD EOS.…”

Section: Vle Derivationmentioning

confidence: 99%

PVTx measurements for N2O+CH3F, N2O+CH2F2, and N2O+CHF3 binary systems

Nicola

Giuliani

Polonara

et al. 2005

Fluid Phase Equilibria

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“…From the elaboration of the P-T curves, it is possible to derive the Vapor -Liquid Equilibrium (VLE) behaviour of the binary system. As explained elsewhere [34], the flash method with the Carnahan-Starling-DeSantis equation of state was used to derive the VLE data from the isochoric measurements. Keeping T, z 1 , and the number of moles equal to the experimental values during the calculation, the flash method provides the calculated values of mole fractions of the liquid phase (x 1 ) and vapor phase (y 1 ) and pressure for each isochoric point.…”

Section: Discussionmentioning

confidence: 99%

Climate Change and Refrigerants: Thermodynamic Properties of Low-GWP Fluids for Domestic Applications and Binary Systems for Low-Temperature Options

2020

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The most commonly used refrigerants are potent greenhouse gasses that can contribute to climate change. Hydro-Fluoro-Olefins are low Global Warming Potential fluids. A summary of our experimental research activity on the thermodynamic properties of two environmentally friendly Hydro-Fluoro-Olefins, namely R1234yf and R1234ze(E), is reported. In particular, the measurements were performed with an isochoric apparatus and the apparatus specifically built to reach temperatures down to about 100 K. The data elaboration confirms the validity of the choice and that R1234yf and R1234ze(E) can be adopted in many domestic applications. Moreover, considering the reduction of the flammability issues of R1234yf and R1234ze(E), the properties of binary systems containing these fluids and carbon dioxide were analyzed. The presented mixtures could be very interesting for low-temperature applications such as cascade cycles.

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Vapor–Liquid-Equilibrium (VLE) properties of R-32+R-134a system derived from isochoric measurements

Cited by 32 publications

References 14 publications

Two-Phase and Vapor-Phase Thermophysical Property (pvTz) Measurements of the Difluoromethane + trans-1,3,3,3-Tetrafluoroprop-1-ene Binary System

Two-Phase and Vapor-Phase Thermophysical Property (pvTz) Measurements of the Difluoromethane + trans-1,3,3,3-Tetrafluoroprop-1-ene Binary System

PVTx measurements for N2O+CH3F, N2O+CH2F2, and N2O+CHF3 binary systems

Climate Change and Refrigerants: Thermodynamic Properties of Low-GWP Fluids for Domestic Applications and Binary Systems for Low-Temperature Options

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