Fluid Property Information

Fluid Property Information

EES provides built-in property data for the fluids listed below. The fluids are grouped into Real Fluids, Ideal Gases, Solutions, Incompressible Substances, and Mixtures (modeled as pseudo-pure substances). Property data for air-water mixtures (psychrometrics) are provided by fluid AirH2O. Thermophysical property data for hundreds of materials are also available in the Incompressible Substances and NASA libraries.

------------------------------- REAL FLUIDS -------------------------------- ---------- MIXTURES -----------

Acetone MDM R11 Air_ha R500

Acetylene MD2M R12 LPG1* R502

Ammonia MD4M R13 NH3H2O R507A

Argon MM R13I1 R404A R508B

Benzene Methane R14 R407A* R512A

Butene Methanol R22 R407C R513A

Carbondioxide n-Butane R23 R407H* R513B*

Carbonmonoxide n-Decane R32 R410A R514A

CarbonylSulfide n-Dodecane R40 R417A R515A

Chlorine n-Heptane R41 R422D* R515B*

Cis-2-Butene n-Hexane R113 R423A* R516A*

Cyclohexane n-Octane R114 R424A*

Cyclopentane n-Nonane R115 R427A*

D4 n-Pentane R116 R428A*

D5 n-Undecane R123 R438A*

Deuterium Neon R124 R444A*

DeuteriumOxide Neopentane R125 R448A

DiethylEther Nitrogen R134a R449A

DimethylCarbonate NitrousOxide R141b R450A

DimethylEther Novec649 R142b R452A

Ethane o-Xylene R143a R452B

Ethanol orthoHydrogen R143m R453A*

Ethylbenzene Oxygen R150 R454A

Ethylene o-Zylene R152a R454B

EthyleneOxide paraHydrogen R161 R454C

Fluorine p-Xylene R218 R455A*

Helium Potassium* R227ea R456A*

Helium3* Propane R236ea R457A*

HFE7000 Propylene R236fa R460A*

Hydrogen PropyleneGlycol R245fa R463A*

HydrogenChloride Propyne R290 R466A

HydrogenSulfide SES36 R365mfc R469A*

Ice Sodium* R600 R470A*

Isobutane Steam R600a R470B*

Isobutene Steam_IAPWS R717 R471A*

Isohexane Steam_NBS R718

Isooctane SulfurDioxide R744

Isopentane SulfurHexafluoride R1123

Krypton THF R1216

m-Xylene Toluene R1224yd(Z)

trans-2-butene R1225ye(Z)

FLD files* *Professional license only

----- IDEAL GASES ----- ------ SOLUTIONS ------ ------ INCOMPRESSIBLE ------

Air CACL2 (Calcium Chloride-Water) The Function Information dialog displays the

AirH2O EA (Ethylene Alcohol-Water) materials in the Incompressible Substances.

Ar EG (Ethylene Glycol-Water) library.

CH3OH GLYC (Glycerol-Water)

CH4 K2CO3 (Potassium Carbonate-Water) Specific heat, enthalpy and entropy data are

C2H2 KAC (Potassium Acetate-Water) available for condensed substances in the

C2H4 KFO (Potassium Formate-Water) NASA database.

C2H6 LICL (Lithium Chloride-Water)

C2H5OH MA (Methyl Alcohol-Water) NASA_EES procedure

C3H8 MGCL2 (Magnesium Chloride-Water)

C4H10 NACL (Sodium Chloride-Water)

C5H12 NH3W (Ammonia-Water)

C6H14 PG (Propylene Glycol-Water)

Liquid Metals library

The fluid properties are of three distinct types: ideal gas, real fluid/mixtures and solutions/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 and mixtures 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. A few fluids use the Martin-Hou equation of state (A.I.Ch.E. Journal, Vol. 1, No. 2, 1955, pp. 142-151) and assume 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.

Solutions refer to a liquid or solid dissolved in water. Most of the properties for solutions require the temperature and mass concentration of the solute 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.