ethane !short name (same as file name) 74-84-0 !CAS number ethane R170 !synonym1 R-170 !synonym2 30.070 !molecular weight [g/mol] 90.352 !triple pt temperature [K] 184.552 !normal boiling pt [K] 305.33 !critical temperature [K] 4871.8 !critical pressure [kPa] 6.87 !critical density [mol/L] 0.0991 !acentric factor 0.00000 !dipole moment [debye] NBP !default reference state 6.001 !version number ! compiled by M. McLinden, NIST Thermophysics Division, Boulder, Colorado ! 03-28-96 MM, original version ! 07-08-96 MM, replace temporary Cp0 with function of Younglove & Ely ! 10-03-96 MM, add surface tension fit ! 10-18-96 MM, missing constant in dilute-gas viscosity model ! 10-28-96 MM, add EOS of Friend et al ! 01-31-97 MM, change pointer for ECS reference viscosity from VS3 to VS1 ! modify ncoeff line for FEQ to accomodate critical region terms ! 02-20-97 MM, add default reference state ! 02-21-97 MM, put viscosity model into revised VS2 format ! 02-26-97 MM, add version number and pointer to visc critical enhancement (both future use) ! 03-11-97 MM, modify ECS-transport to new format ! 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 #EOS !equation of state specification FEQ fundamental (Helmholtz) equation of state; Friend, Ely, Ingham (1991). ?LITERATURE REFERENCE \ ?Friend, D.G., Ingham, H. and Ely, J.F. (1991). Thermophysical properties of ? ethane. J. Phys. Chem. Ref. Data 20(2): 275-347.\ ?\ !end info 90.352 !lower temperature limit [K] 625.00 !upper temperature limit [K] 70000. !upper pressure limit [kPa] 21.9 !maximum density [mol/L] CPP !pointer to Cp0 model 30.070 !molecular weight [g/mol] 90.352 !triple point temperature [K] 1.130d-3 !pressure at triple point [kPa] 21.6645 !density at triple point [mol/L] 184.552 !normal boiling point temp [K] 0.099 !acentric factor 305.33d0 4871.8d0 6.87d0 !Tc [K] ,pc [kPa], rho [mol/L] 305.33d0 6.87d0 !reducing parameters [K, mol/L] 8.314510d0 !gas constant [J/mol-K] 32 4 0 0 0 0 !# terms, # coeff/term for: "normal" terms, critical, spare 0.46215430560d+00 0.0 1.0 0 !a(i),t(i),d(i),l(i) -0.19236936387d+01 1.5 1.0 0 0.39878604003d+00 2.5 1.0 0 0.16054532372d-01 -0.5 2.0 0 0.12895242219d+00 1.5 2.0 0 0.35458320491d-01 2.0 2.0 0 0.34927844540d-01 0.0 3.0 0 -0.11306183380d-01 1.0 3.0 0 -0.39809032779d-01 2.5 3.0 0 0.83031936834d-03 0.0 6.0 0 0.45921575183d-03 2.0 7.0 0 0.17530287917d-06 5.0 7.0 0 -0.70919516126d-04 2.0 8.0 0 -0.23436162249d+00 5.0 1.0 2 0.84574697645d-01 6.0 1.0 2 0.14861052010d+00 3.5 2.0 2 -0.10016857867d+00 5.5 2.0 2 -0.59264824388d-01 3.0 3.0 2 -0.41263514217d-01 7.0 3.0 2 0.21855161869d-01 6.0 5.0 2 -0.74552720958d-04 8.5 6.0 2 -0.98859085572d-02 4.0 7.0 2 0.10208416499d-02 6.5 8.0 2 -0.52189655847d-03 5.5 10.0 2 0.98592162030d-04 22.0 2.0 4 0.46865140856d-01 11.0 3.0 4 -0.19558011646d-01 18.0 3.0 4 -0.46557161651d-01 11.0 4.0 4 0.32877905376d-02 23.0 4.0 4 0.13572090185d+00 17.0 5.0 4 -0.10846471455d+00 18.0 5.0 4 -0.67502836903d-02 23.0 5.0 4 #AUX !auxiliary model specification CPP ideal gas heat capacity function of Friend et al. ?LITERATURE REFERENCE \ ?Friend, D.G., Ingham, H. and Ely, J.F. (1991). Thermophysical properties of ? ethane. J. Phys. Chem. Ref. Data 20(2): 275-347.\ ?\ ?Note: Friend et al. give a Helmholtz form for the ideal gas term; it ? has been converted to a Cp0 form, by the transform:\ ?\ ? Cp0/R = (1 + Q_2) - 4/9*Q_3*Tr**(1/3) - 10/9*Q_4*Tr**(2/3) \ ? - 2*Q_5*Tr + Q_6*U*U*exp(U)/[1 - exp(U)]**2\ ? where: Tr = T/Tcrit, \ ? U = Q_7*Tcrit/T, \ ? and the Q_i are the original coefficients given by Friend.\ ? !end info 90.0 !lower temperature limit [K] 625.0 !upper temperature limit [K] 0.00 !upper pressure limit [kPa] 0.00 !maximum density [mol/L] 305.33 8.314510 !reducing parameters for T, Cp0 4 1 !Nterms: polynonial, exponential 4.8159476d0 0.00d0 != 1 + Q_2; power in T -3.8231688d0 0.33333333333333d0 != -4/9*Q_3 3.6750817d0 0.66666666666667d0 != -10/9*Q_4 1.1191336d0 1.00d0 != -2*Q_5 5.0722267d0 -1.681601128d3 != -Q_6; Q_7*Tcrit @EOS !equation of state specification BWR MBWR equation of state; Younglove & Ely (1987). ?LITERATURE REFERENCE \ ?Younglove, B.A. and Ely, J.F. Thermophysical properties of fluids. II. ? Methane, ethane, propane, isobutane and normal butane. ? J. Phys. Chem. Ref. Data 16:577-798 (1987). \ ?\ ?N.B. all temperatures on IPTS-68\ ? !end of info section 90.348 !lower temperature limit [K] 600.0 !upper temperature limit [K] 70000.0 !upper pressure limit [kPa] 22.08 !maximum density [mol/L] (rho on melting line at 70 MPa) CP1 !pointer to Cp0 model 30.070d0 !molecular weight [g/mol] 90.348d0 !triple point temperature [K] 1.1308d-3 !pressure at triple point [kPa] 21.680d0 !density at triple point [mol/L] 184.548d0 !normal boiling point temp [K] 0.099d0 !acentric factor 305.34d0 4871.34d0 6.875d0 !Tc [K], pc [kPa], rhoc [mol/L] 305.34d0 6.875d0 !reducing parameters [K, mol/L] 6.875d0 !gamma 0.0831434d0 !gas constant [L-bar/mol-K] 32 1 !Nterm, Ncoeff per term -0.3204748852d-03 0.6529792241d-01 -0.1669704591d+01 0.1147983381d+03 -0.1854721998d+05 0.4994149431d-04 -0.4858871291d-01 0.1225345776d+02 0.8622615988d+04 -0.1081290283d-05 0.6279096996d-02 -0.1716912675d+01 -0.1640779401d-04 -0.4356516111d-02 -0.1966649699d+01 0.4026724698d-03 -0.6498241861d-05 0.5111594139d-02 -0.1113010349d-03 -0.7157747547d+03 -0.1848571024d+07 -0.2137365569d+03 0.6275079986d+07 -0.9974911056d+00 0.1129115014d+03 -0.1026469558d-01 -0.5660525915d+03 -0.4209846430d-04 0.2374523553d-01 -0.1289637823d-06 -0.5423801068d-04 0.2239717230d-02 #AUX !auxiliary model specification CP1 ideal gas heat capacity function of Younglove & Ely ?LITERATURE REFERENCE \ ?Younglove, B.A. and Ely, J.F. Thermophysical properties of fluids. II. ? Methane, ethane, propane, isobutane and normal butane. ? J. Phys. Chem. Ref. Data 16:577-798 (1987). \ ? \ !end of info section 90.348 !lower temperature limit [K] 600.0 !upper temperature limit [K] 0.00 !upper pressure limit [kPa] 0.00 !maximum density [mol/L] 1.000 8.31434 !reducing parameters for T, Cp0 7 1 !Nterms: polynonial, exponential -6.9341406909d+5 -3.00d0 3.1534834135d+4 -2.00d0 -6.1033752870d+2 -1.00d0 9.9507922459d+0 0.00d0 -2.8657877948d-2 1.00d0 9.0922897821d-5 2.00d0 -5.2750109915d-8 3.00d0 -1.4243593411d+1 3000.d0 @TRN !transport model specification ECS Extended Corresponding States model for transport props (R134a ref. fluid). ?LITERATURE REFERENCES \ ?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). \ ?\ ?the Lennard-Jones parameters are estimated ?\ !end of info section 90.348 !lower temperature limit [K] 600.0 !upper temperature limit [K] 70000.0 !upper pressure limit [kPa] 22.08 !maximum density [mol/L] (rho on melting line at 70 MPa) FEQ R134a.fld VS1 !model for reference fluid viscosity TC1 !model for reference fluid thermal conductivity 0 !Lennard-Jones flag (0 or 1) (0 => use estimates) 0.00000 !Lennard-Jones coefficient sigma [nm] 000.00 !L-J coefficient epsilon/kB [K] 1 0 0 !number of terms in f_int term in Eucken correlation, spare1, spare 2 1.3200d-3 0.0 0.0 0.0 !coeff, power of T, spare 1, spare 2 0 0 0 !number of terms in psi (visc shape factor): poly,spare1,spare2 0 0 0 !number of terms in chi (t.c. shape factor): poly,spare1,spare2 #ETA !viscosity model specification VS2 pure fluid viscosity model of Younglove & Ely (1987) ?LITERATURE REFERENCE \ ?Younglove, B.A. and Ely, J.F. Thermophysical properties of fluids. II. ? Methane, ethane, propane, isobutane and normal butane. ? J. Phys. Chem. Ref. Data 16:577-798 (1987). \ ?\ ?N.B. all temperatures on IPTS-68\ ?\ !end of info section 90.348 !lower temperature limit [K] 600.0 !upper temperature limit [K] 70000.0 !upper pressure limit [kPa] 22.08 !maximum density [mol/L] (rho on melting line at 70 MPa) CI2 !pointer to collision integral model 0.440110 !Lennard-Jones coefficient sigma [nm] 240. !Lennard-Jones coefficient epsilon/kB [K] 1.46388493d-01 !const in Eq 19 = 5/16*(k*MW/1000/pi/Na)**0.5*1.0d12 0.2102436247d+01 !coeff for initial density dependence of viscosity (eq 21); Fv(1) -0.1065920192d+01 !Fv(2) 1.4 !Fv(3) 305.33 !Fv(4) -0.1903481042d+02 !coefficients for residual viscosity, eqs (22 - 25) 0.1799260494d+04 !Ev(2) 0.1561316986d+02 !Ev(3) -0.1497221136d+05 !Ev(4) 0.1130374601d+00 !Ev(5) -0.2186440756d+02 !Ev(6) 0.8235954037d+04 !Ev(7) NUL !pointer to critical enhancement auxiliary function (none used) #AUX !collision integral specification CI2 collision integral model of M. Klein et al (1974) ?LITERATURE REFERENCE \ ?Klein, M., Hanley, H.J.M., Smith, F.J., and Holland, P. (1974). Natl. Bur. ? Stand. (U.S.), Monograph 47.\ ?\ ?also repeated in: ?Friend, D.G., Ingham, H. and Ely, J.F. (1991). Thermophysical properties of ? ethane. J. Phys. Chem. Ref. Data 20(2): 275-347.\ ?and\ ?Younglove, B.A. and Ely, J.F. Thermophysical properties of fluids. II. ? Methane, ethane, propane, isobutane and normal butane. ? J. Phys. Chem. Ref. Data 16:577-798 (1987). \ ?(but note that there is an error in the Younglove & Ely paper) ? \ !end of info section 90.352 !lower temperature limit [K] 625.00 !upper temperature limit [K] 0.00 !(dummy) upper pressure limit 0.00 !(dummy) maximum density 9 !number of terms -3.0328138281 !Omega: coeffs of {(e/kT)**((i-1)/3 - 1)} 16.918880086 -37.189364917 41.288861858 -24.61592114 8.948843096 -1.8739245042 0.209661014 !N.B. wrong sign in Younglove & Ely, Table 2 -0.009657044 #STN !surface tension specification ST1 surface tension model ?LITERATURE REFERENCE \ ?fit of the data of:\ ?Soares, V.A.M., Almeida, B.J.V.S., McLure, I.A. and Higgins, R.A. (1986). ? Surface tension of pure and mixed simple substances at low temperature. Fluid ? Phase Equilibria 32: 9-16.\ ?\ ?Leadbetter, A.J., Taylor, D.J. and Vincent, B. (1964). The densities and ? surface tension of liquid ethane and nitrous oxide. Can. J. Chem. ? 42: 2930-2932.\ ?\ ?Katz, D.L. and Saltman, W. (1939). Surface tension of hydrocarbons. Ind. Eng. ? Chem. 31: 91-94.\ ?\ !end info 90.348 !lower temperature limit [K] 305.34 !upper temperature limit [K] 0.00 !(dummy) upper pressure limit 0.00 !(dummy) maximum density 2 !number of terms 305.34d0 !critical temperature used in fit (dummy) 0.05378d0 1.26d0 !sigma0 and n -0.007008d0 2.52d0 @END c 1 2 3 4 5 6 7 8 c2345678901234567890123456789012345678901234567890123456789012345678901234567890