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PVTx for the carbon dioxide + hydrofluoromethane 2,3,3,3-tetrafluoroprop-1-ene binary system


G. di Nicola1, C. di Nicola1, G. Giuliani1 and R. Stryjek2

1Dipartimento di Energetica, Università Politecnica delle Marche, Ancona, Italy
2Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland

Keywords: thermophysical properties
property: pressure , volume, temperature
material: refrigerants,

Searching for new perspective refrigerant mixtures for low temperature applications, isochoric measurements have been performed for 2,3,3,3-Tetrafluoroprop-1-ene (CF3CF=CH2, R1234yf) + carbon dioxide (CO2, R744) binary system. Recently, amongst the natural refrigerants, we focused our interest on carbon dioxide [1], expecially because it is non-flammable and it has a low toxicity and a low Global Warming Potential (GWP). R1234yf is a HydroFluoroOlefin, a new refrigerant, recently proposed by the chemical industry. It is a non-ozone-depleting substance, having an atmospheric lifetime of 11 days. Its GWP is approximately 12 for a 20 years time horizon and 4 for a 100 years time horizon. Its thermophysical properties have been studied in previous papers [2,3]. The experiment covered both two phase and superheated vapor regions and were been performed within a temperature range that spans from 223 to 373 K and within a pressure range from 160 to 1700 kPa. The isochoric apparatus, which was already described elsewhere [4], concerns in a twin thermostatic baths filled with different silicone oils. The two silicone oils have different kinematic viscosity values. The one with lower kinematic viscosity, due to its higher volatility, was applied only for the low temperature range, while that with a greater viscosity was applied only at high temperatures. The spherical cells and pressure transducer are immersed in one of the two thermostatic baths. An auxiliary thermostat was used to reach below-ambient temperatures. Our experimental results were also compared with a preliminary equation of state (EOS).

References
  1. G. Di Nicola, G. Giuliani, F. Polonara, R. Stryjek, Blends of carbon dioxide and HFCs as working fluids for the low-temperature circuit in cascade refrigerating systems, International Journal of Refrigeration, Vol. 28, n. 2, p. 130-140, 2005

  2. G. Di Nicola, F. Polonara, G. Santori, Saturated Pressure Measurements of 2,3,3,3 Tetrafluoroprop-1-ene (HFO-1234yf). J. Chem. Eng. Data 2010, 55, 201-204.

  3. C. Di Nicola, G. Di Nicola, M. Pacetti, F. Polonara, G. Santori, P−V−T Behavior of 2,3,3,3-Tetrafluoroprop-1-ene (HFO-1234yf) in the Vapor Phase from (243 to 373) K, J. Chem. Eng. Data 2010, 55 (9), pp 3302–3306.

  4. G. Di Nicola, G. Giuliani, F. Polonara, R. Stryjek., PVT from the Burnett and Isochoric measurements Nitrous oxide, J. Therm. Anal. Calorimetry 2005 vol. 80, pp. 311-316.

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