Transport properties refrigerants

Values calculated from NIST Thermodynamic Properties of Refrigerants and Refrigerant Mixtures Database (REFPROP, Version 5). Thermodynamic properties are from. 32-term MBWR equation of state transport properties are from extended corresponding states model, t = triple point c = critical point. 

Table 3. Thermo(fynaniic said transport properties of v ious pwe refriger its. Con(Utions are for a high pressm-e of 2.5 MPa Mid a low pressm-e of 0.1 MPa wth an ambient temperatme of 300 K. Flow and AP me for 10 W of refrigeration at the cold tip in a 2.5 mm Mneter circidar tube.

FIG. 2-18 Pressure-enthalpy diagram for Refrigerant 11. Properties computed with the NIST REFPROP Database, Version 7.0 (Lemmon, E. W., McLinden, M. O., and Huber, M. L., 2002, NIST Standard Reference Database 23, NIST Reference Fluid Thermodynamic and Transport Properties—REFPROP, Version 7.0, Standard Reference Data Program, National Institute of Standards and Technology), based on the equation of state of Jacobsen, R. T., Penoncello, S. G., and Lemmon, E. W., A Fundamental Equation for Trichlorofluoromethane (R-11), Fluid Those Equilibria 80 45-56, 1992. 

Hydrocarbons such as R290 have been in use for years because they have good thermodynamic and transport properties, as well as low cost and low toxicity [7], Large refrigeration plants in the petrochemical industry typically use R290. Household appliance manufacturers in Europe use isobutene (R600a) [7], In all, U.S. auto manufacturers do not want the potential liability issues associated with the use of a hydrocarbon as a potential refrigerant [7],... 

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