EQUATIONS FOR CALCULATION REFRIGERANTS R32, R125 и R134a VISCOSITY AND THERMAL CONDUCTIVITY
DOI:
https://doi.org/10.15673/0453-8307.6/2013.32747Keywords:
Refrigerants – R32 – R125 – R134a – Gas – Viscosity – Thermal conductivity – Equations.Abstract
Equations for viscosity and thermal conductivity of alternative refrigerants R32, R125 and R134a are made by temperature and pressure variables. Coefficients are determined from experimental and calculated data by means of least square method. Equations describe gas viscosity in temperature range from 298 to 423 K at pressure up to 5,5 MPa for R32, up to 3,7 MPa for R125 and up to 3,9 MPa for R134a. Gas thermal conductivity is described in temperature range from 283 to 434 K at pressure up to 5,0 MPa for R32, from 264 to 354 K at pressure up to 2,8 MPa for R125 and from 293 to 515 K at pressure up to 2,8 MPa for R134a. The precision of composed equations is quite acceptable for the engineering calculations.
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