R125               !short name (same as file name)
354-33-6           !CAS number
pentafluoroethane
HFC-125            !synonym1
R-125              !synonym2
120.022            !molecular weight [g/mol]
172.52             !triple pt temperature [K]
225.006            !normal boiling pt [K]
339.33             !critical temperature [K]
3629.              !critical pressure [kPa]
4.75996            !critical density [mol/L]
0.30349            !acentric factor
1.563              !dipole moment [Debye]--Meyer & Morrison, J Phys Chem 95:3860 (1991)
IIR                !default reference state
6.001              !version number

! compiled by M. McLinden, NIST Thermophysics Division, Boulder, Colorado
! 11-01-95  MM, original version
! 03-15-96  MM, add transport correlations compiled by S.A. Klein
! 06-17-96  MM, add thermal conductivity coefficients fitted by S.A. Klein
! 07-08-96  MM, add dummy A(4) and A(5) terms to TCX correlation
! 08-19-96  MM, add surface tension fit
! 10-09-96  MM, add dipole moment value
! 01-08-97  MM, correct A(1) coefficient in thermal conductivity correlation
! 01-31-97  MM, change pointer for ECS reference viscosity from VS3 to VS1
! 02-07-97  MM, recast thermal cond model of Perkins into new TC1 form
! 02-20-97  MM, add default reference state
! 02-25-97  MM, put t.c. critical enhancement in TK1 form
! 02-26-97  MM, add version number (future use)
! 03-11-97  MM, modify ECS-transport to new format
! 03-25-97  MM, set Psi,Chi coeff in ECS-transport to 1,0 pending refit of data
! 05-15-97 EWL, add parameters for ECS viscosity correlation
! 08-21-97  MM, purge exponentials from values read by GUI (e.g. model limits)
! 10-24-97  MM, read in f_int term in Eucken correlation in ECS method for t.c.
!               change reference fluid EOS for ECS-transport from BWR to FEQ
! 10-28-97  MM, update version number, switch back to R134a/BWR ref fluid,
!               not working with FEQ for some strange reason
! 11-13-97  MM, enter thermal conductivity shape factor fitted to data

#EOS               !equation of state specification
BWR  MBWR equation of state; Outcalt & McLinden (1995).
?LITERATURE REFERENCE \
?S.L. Outcalt and M.O. McLinden. Equations of state for the thermodynamic
? properties of R32 (difluoromethane) and R125 (pentafluoroethane).
? Int. J. Thermophysics 16:79-89 (1995).\
?\
?ABSTRACT \
?Thermodynamic properties of difluoromethane (R32) and pentafluoroethane (R125)
? are expressed in terms of 32-term modified Benedict-Webb-Rubin (MBWR)
? equations of state.  For each refrigerant, coefficients are reported for the
? MBWR equation and for ancillary equations used to fit the ideal-gas heat
? capacity and the coexisting densities and pressure along the saturation
? boundary.  The MBWR coeffients were determined with a multiproperty fit that
? used the following types of experimental data:  PVT; isochoric, isobaric, and
? saturated-liquid heat capacities; second virial coefficients; and properties
? at coexistence.  The respective equations of state accurately represent
? experimental data from 160 to 393 K and pressures to 35 MPa for R32 and from
? 174 to 448 K and pressures to 68 MPa for R125 with the exception of the
? critical regions.  Both equations give reasonable results upon extrapolation
? to 500 K and 60 MPa.  Comparisons between predicted and experimental values
? are presented.\
?\
!end of info section
172.52             !lower temperature limit [K]
500.0              !upper temperature limit [K]
60000.0            !upper pressure limit [kPa]
14.10              !maximum density [mol/L]
CPP                                    !pointer to Cp0 model
120.022d0                              !molecular weight [g/mol]
172.52d0                               !triple point temperature [K]
2.921d0                                !pressure at triple point [kPa]
14.095d0                               !density at triple point (max density)
225.006d0                              !normal boiling point temp [K]
  0.30349d0                            !acentric factor
339.33d0  3629.d0  4.75996d0           !Tc [K], pc [kPa], rhoc [mol/L]
339.33d0           4.75996d0           !reducing parameters [K, mol/L]
4.75996d0                              !gamma
0.08314471d0                           !gas constant [L-bar/mol-K]
      32       1                       !Nterm, Ncoeff per term
  -0.523369607050d-01   0.378761878904d+01  -0.807152818990d+02
   0.115654605248d+05  -0.152175619161d+07   0.597541484451d-02
  -0.145990589966d+01  -0.992338995652d+03  -0.399180535687d+06
  -0.722591037504d-03   0.358108080969d+00  -0.108627994573d+03
   0.229821626570d-01   0.149537670449d+01   0.911199833952d+03
  -0.254479949722d+00   0.102433894096d-01  -0.645583164735d+01
   0.218649963191d+00   0.114748721552d+07  -0.118389825386d+09
   0.306539775027d+05   0.542870289406d+09   0.903502635609d+03
  -0.153646507435d+06   0.314617903718d+01   0.429297546671d+06
   0.109652021582d+00  -0.329350271819d+02  -0.338796950505d-03
   0.384533651902d+00  -0.491511706857d+02


#AUX               !auxiliary model specification
CPP  polynomial fit for ideal gas heat capacity; Outcalt & McLinden (1995).
?LITERATURE REFERENCE \
?S.L. Outcalt and M.O. McLinden. Equations of state for the thermodynamic
? properties of R32 (difluoromethane) and R125 (pentafluoroethane).
? Int. J. Thermophysics 16:79-89 (1995).\
?\
!end of info section
150.0              !lower temperature limit [K]
500.0              !upper temperature limit [K]
0.00               !upper pressure limit [kPa]
0.00               !maximum density [mol/L]
339.33   8.314471                     !reducing parameters for T, Cp0
4   0                                 !Nterms:  polynonial, exponential
 3.111514d0        0.00               !c(i), power of T/Tc
10.982115d0        1.00
-1.843797d0        2.00
 0.019273d0        3.00


#AUX               !auxiliary model specification
CP1  polynomial fit for ideal gas heat capacity; Outcalt & McLinden (1995).
?LITERATURE REFERENCE \
?S.L. Outcalt and M.O. McLinden. Equations of state for the thermodynamic
? properties of R32 (difluoromethane) and R125 (pentafluoroethane).
? Int. J. Thermophysics 16:79-89 (1995).\
?\
?N.B. The Cp0/R(Tr) function of Outcalt & McLinden has been transformed to Cp0(T).
?\
!end of info section
150.0              !lower temperature limit [K]
500.0              !upper temperature limit [K]
0.00               !upper pressure limit [kPa]
0.00               !maximum density [mol/L]
1.000     1.000                       !reducing parameters for T, Cp0
4   0                                 !Nterms:  polynonial, exponential
25.87069d0         0.00               !c(i), power of T
 0.2690914d0       1.00
-1.331388d-4       2.00
 4.101330d-9       3.00


#TRN               !transport model specification
ECS  Extended Corresponding States model for transport props (R134a ref. fluid).
?LITERATURE REFERENCES FOR THE ECS MODEL \
?Klein, S.A., McLinden, M.O. and Laesecke, A. (1997). An improved extended
? corresponding states method for estimation of viscosity of pure refrigerants
? and mixtures. Int. J. Refrigeration  20: 208-217. \
?\
?Huber, M.L., Friend, D.G. and Ely, J.F. Prediction of the thermal
? conductivity of refrigerants and refrigerant mixtures.
? Fluid Phase Equilibria  80: 249-261 (1992). \
?\
?DATA SOURCES FOR THERMAL CONDUCTIVITY\
?The ECS parameters for thermal conductivity were based on the data of:\
?\
?Grebenkov, A.J., Kotelevsky, Y.G., Saplitza, V.V., Beljaeva, O.V.,
? Zajatz, T.A. and Timofeev, B.D. (1994). Experimental study of thermal
? conductivity of some ozone safe refrigerants and speed of sound in
? their liquid phase. CFCs:  The Day After, Joint Meeting of IIR
? Commissions B1, B2, E1, and E2, Padova, Italy, September 21-23,
? IIR, 419-429.\
?\
?Perkins, R.A., Laesecke, A., Howley, J.B., Huber, M.L. and
? Nieto de Castro, C.A. (1998). Experimental thermal conductivity and
? thermal diffusivity values for R32, R125, and R134a. National
? Institute of Standards and Technology, NISTIR (in preparation).\
?\
?Shankland, I.R. (1990). Transport properties of CFC alternatives.
? paper presented at AIChE Spring National Meeting, Orlando, Florida\
?\
?Tsvetkov, O.B., Laptev, Y.A. and Asambaev, A.G. (1993). Thermal
? conductivity of refrigerants R123, R134a and R125 at low temperatures.
? Int. J. Thermophysics  15: 203-214.\
?\
?Wilson, L.C., Wilding, W.V., Wilson, G.M., Rowley, R.L., Felix, V.M.
? and Chilsom-Carter, T. (1992). Thermophysical properties of HFC-125.
? Fluid Phase Equilibria  80: 167_177.\
?\
?average absolute deviations of the fit from the experimental data were:\
?  Grebenkov:  4.34%; Perkins:  1.00%; Shankland:  1.28%;
?  Tsvetkov:  3.99%; Wilson:  4.38%; overall:  1.30%\
?\
?DATA SOURCES FOR VISCOSITY\
?The ECS parameters for viscosity were based on the data of:\
?Assael, M.J., Papadopoulos, A.A. and Polimatidou, S. (1995). Measurements of
? the viscosity of refrigerants in the vapour phase. 4th Asian Thermophysical
? Properties Conference, Tokyo, 3: 623-626.\
?\
?Diller, D.E. and Peterson, S.M. (1993). Measurements of the viscosities of
? saturated and compressed fluid 1-chloro-1,2,2,2-tetrafluoroethane (R124) and
? pentafluoroethane (R125) at temperatures between 120 and 420 K. Int. J.
? Thermophysics  14: 55-66.\
?\
?Oliveira, C.M.B.P. and Wakeham, W.A. (1993). The viscosity of R32 and R125.
? Int. J. Thermophysics  14: 1131-1143.\
?\
?average absolute deviations of the fit from the experimental data were:\
?  Assael:  2.57%; Diller:  1.57%; Oliveira:  4.60%; overall:  2.07%\
?\
?Lennard-Jones parameters are based on the low-density viscosity data
? of Assael\
?\
!end of info section
172.52             !lower temperature limit [K]
500.0              !upper temperature limit [K]
60000.0            !upper pressure limit [kPa]
14.10              !maximum density [mol/L]
BWR R134a.fld
VS1                !model for reference fluid viscosity
TC1                !model for reference fluid thermal conductivity
1                  !Lennard-Jones flag (0 or 1) (0 => use estimates)
  0.5101           !Lennard-Jones coefficient sigma [nm]
261.39             !L-J coefficient epsilon/kB [K]
2  0  0            !number of terms in f_int term in Eucken correlation, spare1, spare 2
 1.2565d-3   0.0   0.0   0.0  !coeff, power of T, spare 1, spare 2
 2.2296d-7   1.0   0.0   0.0
2  0  0            !number of terms in psi (visc shape factor):  poly,spare1,spare2
 1.0697696   0.0   0.0   0.0  !coeff, power of Tr, power of Dr, spare
-0.0182553   0.0   1.0   0.0
2  0  0            !number of terms in chi (t.c. shape factor):  poly,spare1,spare2
 1.0369d+0   0.0   0.0   0.0  !coeff, power of Tr, power of Dr, spare
-3.0368d-3   0.0   1.0   0.0


#STN        !surface tension specification
ST1  surface tension model
?LITERATURE REFERENCE \
?Okada, M. and Higashi, Y. (1995). Experimental surface tensions for
? HFC-32, HCFC-124, HFC-125, HCFC-141b, HCFC-142b, and HFC-152a.
? Int. J. Thermophysics  16(3): 791-800.\
?\
!end info
273.               !lower temperature limit [K]
339.33             !upper temperature limit [K]
0.00               !(dummy) upper pressure limit
0.00               !(dummy) maximum density
1                      !number of terms
339.17d0               !critical temperature used by Okada & Higashi (dummy)
0.05260d0  1.240d0     !sigma0 and n


@END
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