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Precise Measurements of the Vapor-Liquid Equilibria (VLE) of HFC-32/134a Mixtures Using a New Apparatus
A new apparatus for precise measurements of the vapor-liquid equilibria of mixtures by the circulation method has been developed. This apparatus has...
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Optimum Selection of Refrigerants Under Environmental Constraints
In any thermal energy conversion systems such as refrigeration, air-conditioning and heat pum** systems, it is needless to emphasize that the...
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Simultaneous Measurement of the Density and Viscosity of Compressed Liquid Toluene
A vibrating-wire densimeter described previously has been used to perform simultaneous measurements of the density and viscosity of toluene at...
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Optimum Refrigerant Selection for Low Temperature Engineering
The selection of refrigerants or refrigerant mixtures with desirable combination of such properties as contribution to greenhouse effect,...
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Phase Equilibria of CFC Alternative Refrigerant Mixtures: 1,1,1,2,3,3,3-Heptafluoropropane (HFC-227ea)+Difluoromethane (HFC-32), +1,1,1,2-Tetrafluoroethane (HFC-134a), and +1,1-Difluoroethane (HFC-152a)
Isothermal vapor–liquid equilibria were measured for the binary systems difluoromethane (HFC-32)+1,1,1,2,3,3,3-heptafluoropropane (HFC-22ea) and...
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Use of the ASPEN Plus Process Simulator in Modeling Systems Containing Hydrofluoric Acid
Nonideal association in the vapor phase of HF poses a challenge in modeling. In this paper, a hybrid HF equation in the ASPEN Plus process simulation...
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Viscosity of Gaseous Mixtures of HFC-125+HFC-32
This paper reports experimental results for the viscosity of gaseous mixtures of HFC-125 (pentafluoroethane)+HFC-32 (difluoromethane). The...
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Is Climate Predictable?
Two forms of climate prediction are considered: the forecast of natural climate fluctuations such as El Niño, and the determination of the effect of...
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Vapor pressure of pentafluoroethane and trifluoroiodomethane
Pentafluoroethane (HFC-125) and trifluoroiodomethane (CF 3 I) are considered as promising refrigerant alternatives, especially as components in...
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Thermodynamic Modeling of Gas-Phase PVTx Properties for the Ternary R-32/125/143a System
Experimental PVTx property data have been used to develop a thermodynamic model of the gas-phase PVTx properties for R-32/125/143a in terms of a...
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Dielectric Properties of Liquid Pentafluoroethane (HFC-125)
This paper reports measurements of the static relative permittivity of HFC-125 in the liquid phase, performed by using the direct capacitance method...
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Vapor–Liquid Equilibria for the 1,1,1-Trifluoroethane (HFC-143a)+1,1,1,2-Tetrafluoroethane (HFC-134a) System
A vapor–liquid equilibrium apparatus has been developed and used to obtain data for the binary HFC-143a+HFC-134a system. Fifty-four equilibrium data...
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Measurements of the Thermal Conductivity of HFC-143a in the Temperature Range from 300 to 500 K at Pressures up to 50 MPa
Measurements of the thermal conductivity of HFC-143a that were made by a coaxial cylinder cell operating in steady state are reported. The...
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Prediction of refrigerant gas hydrates formation conditions
A fugacity model was developed for prediction of mixed refrigerant gas hydrates formation conditions based on the molecule congregation and solution...
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Thermodynamic Property Model for Fluid-Phase n-Butane
A Helmholtz free energy equation of state for the fluid phase of n-butane (R-600) has been developed on the basis of the ITS-90 temperature scale....
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pρT Measurements of Polyethylene Glycol Dimethylethers Between 278.15 and 328.15 K at Pressures to 12 MPa
In this paper we present a new experimental apparatus designed to measure pressure–density–temperature ( pρT ) properties with a high-pressure...
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Vapor–Liquid Equilibria of CFC Alternative Refrigerant Mixtures: Trifluoromethane (HFC-23)+Difluoromethane (HFC-32), Trifluoromethane (HFC-23)+Pentafluoroethane (HFC-125), and Pentafluoroethane (HFC-125)+1,1-Difluoroethane (HFC-152a)
Isothermal vapor–liquid equilibria for three binary mixtures of CFC alternative refrigerants were determined in an equilibrium apparatus in which...
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The Sun's Role in Long-Term Climate Change
Evidence suggests that changes of solar irradiance in recent centuries have provided a significant climate forcing and that the sun has been one of...
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Vapor–Liquid Equilibrium Measurements for Binary Mixtures Containing 1,1,1,2,3,3,3-Heptafluoropropane (HFC-227ea)1
Isothermal vapor–liquid equilibrium data for two binary mixtures of alternative refrigerants were determined by using an apparatus applying...
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Measurements of PVTx Properties for Binary Mixtures of HFC-32 (CH2F2) and HFC-134a (CH2FCF3)
An experimental study of pressure–volume–temperature–composition ( PVTx ) properties for binary mixtures of HFC-32 and HFC-134a was conducted in the...