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An Equation of State for Fluoroethane (R161)

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Abstract

Fluoroethane (R161, C2H5F, 353-36-6) is a potential alternative refrigerant with excellent cycle performance, with zero ozone-depletion potential and low global warming potential. In this study, the thermodynamic property formulation for fluoroethane has been developed with the use of available experimental thermodynamic property data. In determining the equation of state, multiproperty fitting methods were used including single-phase pressure–density–temperature (pρT), vapor pressure, and saturated liquid-density data. The equation of state has been developed to conform to the Maxwell criterion for two-phase liquid–vapor equilibrium states, and is valid for temperatures from 130 K to 450 K, and pressures to 5 MPa. The extrapolation behavior of the equation of state at high temperatures and high pressures is reasonable. As there are very few compressed liquid-density experimental data published, the uncertainties in density of the equation of state are estimated to be 2.0 % in the compressed-liquid region and 0.5 % in the gas and supercritical regions. Uncertainties in vapor pressure are 0.5 % above 200 K and increase at lower temperatures. The uncertainties for all properties are higher in the critical region, except vapor pressure. Detailed comparisons between experimental and calculated data have been performed in this study.

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Abbreviations

a :

Specific Helmholtz energy

a i , c i , v i , n i :

Coefficients

B :

Second virial coefficient

C :

Third virial coefficient

c p :

Specific isobaric heat capacity

c v :

Specific isochoric heat capacity

\({d_{i}, l_{i}, t_{i}, \eta_{i}, \beta_{i}, \gamma_{i},\varepsilon_{i}, u_{i}}\) :

Exponents

h :

Specific enthalpy

i :

Index number

M :

Molar mass

N :

Number of data points

p :

Pressure

R :

Molar gas constant

s :

Specific entropy

T :

Temperature

w :

Sound speed

Δ:

Deviation

α :

Dimensionless Helmholtz energy

δ :

Reduced density

ρ :

Density

τ :

Inverse reduced temperature

ω :

Acentric factor

0:

Ideal gas

r:

Residual

′:

Saturated-liquid state

0:

Reference state

c:

Critical

calc:

Calculated

esd:

Estimated

exp:

Experimental

l:

Liquid

nbp:

Normal boiling point

v:

Vapor

σ :

Saturation

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  1. Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education (MOE), Xi’an Jiaotong University, Xi’an, 710049, China

    Jiangtao Wu & Yong Zhou

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  1. Jiangtao Wu
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  2. Yong Zhou
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Correspondence to Jiangtao Wu.

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Wu, J., Zhou, Y. An Equation of State for Fluoroethane (R161). Int J Thermophys 33, 220–234 (2012). https://doi.org/10.1007/s10765-011-1151-3

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  • DOI: https://doi.org/10.1007/s10765-011-1151-3

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