Contents - Index
Fluid Property Information
EES provides built-in thermophysical property data for the fluids listed below. The fluids are grouped into Real Fluids, Ideal Gases, Brines, Incompressible Substances, and Mixtures. Some of these refrigerants in the Real Fluids category, e.g., R410A, R450A, R513A and others, are mixtures but their properties can be represented using similiar equations to those used for the pure real fluids. Property data for air-water mixtures (psychrometrics) are provided by fluid AirH2O. Incompressible substances are not listed as they are provided with external Lookup table files. However, you can view a list of all incompressible substances by selecting Function Info from the Options window, clicking the Thermophysical properties button and then selecting the Incompressible option.
Click on a fluid name to access additional information for that fluid. All names in EES are case-insensitive. Note that, in addition to the list of fluids shown below, the property functions will operate with any of the 1262 gases provided in the NASA ideal gas data base. Additional fluid property data can be added by the user.
-------------------------------------- REAL FLUIDS ------------------------------ -----------MIXTURES ----------
Acetone m-Xylene R32 Air_ha
Acetylene Methane R40 NH3H2O
Ammonia Methanol R41 R404A
Argon n-Butane R113 R407C
Benzene n-Decane R114 R410A
Butene n-Dodecane R115 R417A
Carbondioxide n-Heptane R116 R423A
Carbonmonoxide n-Hexane R123 R427A
CarbonylSulfide n-Octane R124 R448A
Cis-2-Butene n-Nonane R125 R449A
Cyclohexane n-Pentane R134a R450A
Cyclopentane n-Undecane R141b R452A
D4 Neon R142b R452B
D5 Neopentane R143a R454A
Deuterium Nitrogen R143m R454B
DeuteriumOxide NitrousOxide R152a R454C
DiethylEther Novec649 R161 R455A
DimethylCarbonate o-Xylene R218 R460A
DimethylEther orthoHydrogen R227ea R466A
Ethane Oxygen R236ea R500
Ethanol o-Zylene R245fa R502
Ethylbenzene paraHydrogen R236fa R507A
Ethylene Propane R290 R508B
Fluorine p-Xylene R365mfc R513A
Helium Propylene R600 R513B
HFE7000 SES36 R600a R514A
HFE7100 Steam R717 R515A
HFE7200 Steam_IAPWS R718
HFO1336mzz(Z) Steam_NBS R744
HFE7500 SulfurDioxide RC318
Hydrogen SulfurHexafluoride R1216
HydrogenChloride Toluene R1224yd(Z)
HydrogenSulfide trans-2-butene R1225ye(Z)
Ice Water R1233zd(E)
Isobutane Xenon R1234yf
Isobutene R11 R1234ze(E)
Isohexane R12 R1234ze(Z)
Isopentane R13 R1243zf
Krypton R13I1 RE245cb2
MDM R14 RE245fa2
MD2M R22 .FLD files
----- IDEAL GASES ----- ------ BRINES ------ ------ INCOMPRESSIBLE ------
Air CACL2 (Calcium Chloride-Water) Incompressible substances are provided in
AirH2O EA (Ethylene Alcohol-Water) separate Lookup (.LKT) tables. See the
Ar EG (Ethylene Glycol-Water) Function Information dialog for a
CH3OH GLYC (Glycerol-Water) list of these substances.
CH4 K2CO3 (Potassium Carbonate-Water)
C2H2 KAC (Potassium Acetate-Water)
C2H4 KFO (Potassium Formate-Water)
C2H6 LICL (Lithium Chloride-Water)
C2H5OH MA (Methyl Alcohol-Water)
C3H8 MGCL2 (Magnesium Chloride-Water)
C4H10 NACL (Sodium Chloride-Water)
C5H12 NH3W (Ammonia-Water)
C6H14 PG (Propylene Glycol-Water)
The fluid properties are of three distinct types: ideal gas, real fluid and brines/incompressible. The enthalpy and internal energy of ideal gas substances are dependent only upon temperature. EES will not accept pressure, along with temperature, as an independent property input in the Enthalpy and IntEnergy functions for ideal gas substances. A general rule is that substances having a name that is a chemical formula, e.g., N2 or CO2, are implemented to be ideal gases whereas real fluids use spelled-out names, e.g., Nitrogen and CarbonDioxide. Air and AirH2O (psychrometric relations) are exceptions to this rule in that both are based on ideal gas behavior. Whenever a chemical symbol notation (e.g., Ar, N2, CO2, CH4 etc.) is used, the substance is modeled as an ideal gas and the enthalpy and entropy values are based on JANAF table references. The JANAF table reference for enthalpy is based on the elements having an enthalpy value of 0 at 298K (537R). The entropy of these substances is based on the Third Law of Thermodynamics.
Whenever the substance name is spelled out (e.g., Argon, Steam (or Water or R718), Nitrogen, R12, CarbonDioxide, Methane, etc.) the substance is modeled as a real fluid with subcooled, saturated, and superheated phases. Most of the real fluids in the table above employ a high accuracy equation of state that accurately provides property information at all conditions including the vicinity of the critical point and the subcooled region. Specific references to the equation of state are provided for each fluid. Otherwise, the fluid properties in the subcooled region are determined using the Martin-Hou equation of state (A.I.Ch.E. Journal, Vol. 1, No. 2, 1955, pp. 142-151) and by assuming the fluid is incompressible. The Martin-Hou equation of state has a claimed accuracy of 1% in specific volume for conditions at which the density is less than 1.5 * Critical density. Thermodynamic properties at densities greater than 1.5 * critical density or in the vicinity of the critical point may be inaccurate with the Martin-Hou equation of state.
Brine properties are provided given the temperature and mass concentration in %.
NH3H2O (ammonia-water) is a mixture. It requires 3 independent properties. The property designators are the same as for pure fluids with the following two differences. X designates mass fraction. Q designates quality.
Starting with version 10.364, the property keywords Water, Steam, R718 and Steam_IAPWS are treated identically. All four keywords provided access to property correlations use the Steam_IAPWS property correlations, which provide the most accurate property data for water substance and it is the current international standard. Steam_NBS and Ice use the property correlations published by Harr, Gallagher, and Kell (Hemisphere, 1984).These property correlations were the basis of the international standard for water before 1995.
Starting with version 10.627, EES can read .FDL files used with the NIST REFPROP program, which extends the number of pure fluids for which EES can provide property information.