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- .pa
- THERMODYNAMIC PROPERTIES
-
- These thermodynamic property procedures are all derived from tabular data,
- curve-fits, or first principles. All of the thermodynamic properties of steam
- are consistent with Maxwell's relationships. This is not the case with the
- work of some other programmers that I have seen; and it is CRUCIAL for
- accurate, consistent thermodynamic analyses.
-
- All of the steam properties are based on the Tables of Keenan, Keyes, Hill,
- and Moore (published in 1969 by John Wyley and Sons). These are particularly
- well suited to computerizing (which is something that I can't say about other
- steam tables). I also have ASME and NBS steam properties; but because of the
- inconsiderate way in which these regressions were done, these properties are
- slower than a heard of snails crawling up Pike's Peak in a hailstorm and of
- insufficiently greater accuracy to be worth the price in CPU time (I've never
- heard of a steam plant operating at 120,000 psia feedwater pressure). All of
- the steam properties are accurate to five or so figures or the limit of single
- precision which is as accurate as the tables.
-
- All of the moist air properties are based on the ASHRAE tables and are at
- least as accurate as the tabulated values (in some cases like absolute
- humidity they are more accurate than the tables). Note that wet-bulb
- temperature is assumed to be the same as the adiabatic saturation temperature.
-
- All quantities are in standard, useful units (not to be confused with Silly
- Inane units).
- .pa
- QUICK LIST OF THERMODYNAMIC SUBROUTINES
-
- CHNGP0... change air pressure
- CPFOFT... constant pressure specific heat of saturated liquid water
- CPGOFT... constant pressure specific heat of saturated vapor water
- DVFOFT... dynamic viscosity of saturated liquid water
- DVGOFT... dynamic viscosity of saturated vapor water
- FCPM..... constant pressure specific heat of moist air
- FDWA..... diffusion coefficient for water into air
- FHTWB.... enthalpy of moist air from wet-bulb
- FKM...... thermal conductivity of moist air
- FMUM..... dynamic viscosity of moist air
- FPSAT.... saturation pressure of steam
- FPVDWB... partial pres. of water vapor in moist air from dry- and wet-bulb
- FPWSAT... saturation partial pressure of water vapor in air
- FRHDWB... relative humidity from dry- and wet-bulb
- FRHOL.... density of liquid water at 1 atm.
- FRHOM.... density of moist air
- FSTW..... surface tension of water
- FTDBHW... dry-bulb from enthalpy and humidity
- FTDPDW... dew-point from dry- and wet-bulb
- FTDWBW... dry-bulb from wet-bulb and humidity
- FTDWRH... dry-bulb from wet-bulb and relative humidity
- FTSAT.... saturation temperature of steam
- FTWBH.... wet-bulb from enthalpy
- FTWDBP... wet-bulb from dry-bulb and dew-point
- FTWDRH... wet-bulb from dry-bulb and relative humidity
- FTWSAT... saturation temperature from partial pressure
- FWBDBW... wet-bulb from dry-bulb and humidity
- FWDBRH... humidity from dry-bulb and relative humidity
- FWDWB.... humidity from dry- and wet-bulb
- FWSAT.... saturation humidity
- STATE.... 2-character state indicator
- TKFOFT... thermal conductivity of saturated liquid water
- TKGOFT... thermal conductivity of saturated vapor water
- TOFPH.... temperature etc. from pressure and enthalpy
- TOFPS.... temperature etc. from pressure and entropy
- TV2PHS... pressure, enthalpy, and entropy from temperature and volume
- VOFTP.... volume from temperature and pressure
- .pa
- NAME: CHNGP0 (note zero "0" not oh "O")
- PURPOSE: change air pressure
- TYPE: subroutine (far external)
- SYNTAX: CALL CHNGP0(P)
- INPUT: P (REAL*4) pressure in psia
- OUTPUT: none
-
-
- NAME: CPFOFT
- PURPOSE: constant pressure specific heat of saturated liquid water
- TYPE: REAL*4 function (far external)
- SYNTAX: CP=CPFOFT(T)
- INPUT: T (REAL*4) temperature [F]
- OUTPUT: CP (REAL*4) constant pressure specific heat [Btu/lbm/F]
-
-
- NAME: CPGOFT
- PURPOSE: constant pressure specific heat of saturated vapor water
- TYPE: REAL*4 function (far external)
- SYNTAX: CP=CPFOFT(T)
- INPUT: T (REAL*4) temperature [F]
- OUTPUT: CP (REAL*4) constant pressure specific heat [Btu/lbm/F]
-
-
- NAME: DVFOFT
- PURPOSE: dynamic viscosity of saturated liquid water
- TYPE: REAL*4 function (far external)
- SYNTAX: DV=DVFOFT(T)
- INPUT: T (REAL*4) temperature [F]
- OUTPUT: DV (REAL*4) dynamic viscosity [lbm/ft/hr]
-
-
- NAME: DVGOFT
- PURPOSE: dynamic viscosity of saturated vapor water
- TYPE: REAL*4 function (far external)
- SYNTAX: DV=DVGOFT(T)
- INPUT: T (REAL*4) temperature [F]
- OUTPUT: DV (REAL*4) dynamic viscosity [lbm/ft/hr]
-
-
- NAME: FCPM
- PURPOSE: constant pressure specific heat of moist air
- TYPE: REAL*4 function (far external)
- SYNTAX: CP=FCPM(T,W)
- INPUT: T (REAL*4) temperature [F]
- W (REAL*4) absolute humidity []
- OUTPUT: CP (REAL*4) constant pressure specific heat [Btu/lbm/F]
-
-
- NAME: FDWA
- PURPOSE: diffusion coefficient for water into air
- TYPE: REAL*4 function (far external)
- SYNTAX: D=FDWA(T)
- INPUT: T (REAL*4) temperature [F]
- OUTPUT: D (REAL*4) diffusion coefficient [sq.ft/hr]
-
-
- NAME: FHTWB
- PURPOSE: enthalpy of moist air from wet-bulb
- TYPE: REAL*4 function (far external)
- SYNTAX: H=FHTWB(TWB)
- INPUT: TWB (REAL*4) wet-bulb temperature [F]
- OUTPUT: H (REAL*4) enthalpy [Btu/lbm-dry-air]
-
-
- NAME: FKM
- PURPOSE: thermal conductivity of moist air
- TYPE: REAL*4 function (far external)
- SYNTAX: TK=FKM(T,W)
- INPUT: T (REAL*4) temperature [F]
- W (REAL*4) absolute humidity []
- OUTPUT: TK (REAL*4) thermal conductivity [Btu/hr/ft]
-
-
- NAME: FMUM
- PURPOSE: dynamic viscosity of moist air
- TYPE: REAL*4 function (far external)
- SYNTAX: DV=FMUM(T,W)
- INPUT: T (REAL*4) temperature [F]
- W (REAL*4) absolute humidity []
- OUTPUT: DV (REAL*4) dynamic viscosity [lbm/ft/hr]
-
-
- NAME: FPSAT
- PURPOSE: saturation pressure of steam
- TYPE: REAL*4 function (far external)
- SYNTAX: PSAT=FPSAT(TSAT)
- INPUT: TSAT (REAL*4) saturation temperature [F]
- OUTPUT: PSAT (REAL*4) saturation pressure [psia]
-
-
- NAME: FPVDWB
- PURPOSE: partial pres. of water vap in moist air from dry- and wet-bulb
- TYPE: REAL*4 function (far external)
- SYNTAX: PV=FPVDWB(TDB,TWB)
- INPUT: TDB (REAL*4) dry-bulb temperature [F]
- TWB (REAL*4) wet-bulb temperature [F]
- OUTPUT: PV (REAL*4) partial pressure [psia]
-
-
- NAME: FPWSAT
- PURPOSE: saturation partial pressure of water vapor in air
- TYPE: REAL*4 function (far external)
- SYNTAX: PW=FPWSAT(T)
- INPUT: T (REAL*4) temperature [F]
- OUTPUT: PW (REAL*4) saturation partial pressure [psia]
-
-
- NAME: FRHDWB
- PURPOSE: relative humidity from dry- and wet-bulb
- TYPE: REAL*4 function (far external)
- SYNTAX: RH=FRHDWB(TDB,TWB)
- INPUT: TDB (REAL*4) dry-bulb temperature [F]
- TWB (REAL*4) wet-bulb temperature [F]
- OUTPUT: RH (REAL*4) relative humidity [%]
-
-
- NAME: FRHOL
- PURPOSE: density of liquid water at 1 atm.
- TYPE: REAL*4 function (far external)
- SYNTAX: D=FRHOL(T)
- OUTPUT: D (REAL*4) density [lbm/cu.ft]
-
-
- NAME: FRHOM
- PURPOSE: density of moist air
- TYPE: REAL*4 function (far external)
- SYNTAX: D=FRHOM(P,TDB,W)
- INPUT: P (REAL*4) pressure [psia]
- TDB (REAL*4) dry-bulb temperature [F]
- W (REAL*4) absolute humidity []
- OUTPUT: D (REAL*4) density [lbm/cu.ft]
-
-
- NAME: FSTW
- PURPOSE: surface tension of water
- TYPE: REAL*4 function (far external)
- SYNTAX: S=FSTW(T)
- INPUT: T (REAL*4) temperature [F]
- OUTPUT: S (REAL*4) surface tension [lbf/ft]
-
-
- NAME: FTDBHW
- PURPOSE: dry-bulb from enthalpy and humidity
- TYPE: REAL*4 function (far external)
- SYNTAX: TDB=FTDBHW(H,W)
- W (REAL*4) absolute humidity []
- OUTPUT: TDB (REAL*4) dry-bulb temperature [F]
-
-
- NAME: FTDPDW
- PURPOSE: dew-point from dry- and wet-bulb
- TYPE: REAL*4 function (far external)
- SYNTAX: TDP=FTDPDW(TDB,TWB)
- INPUT: TDB (REAL*4) dry-bulb temperature [F]
- TWB (REAL*4) wet-bulb temperature [F]
- OUTPUT: TDP (REAL*4) dew-point temperature [F]
-
-
- NAME: FTDWBW
- PURPOSE: dry-bulb from wet-bulb and humidity
- TYPE: REAL*4 function (far external)
- SYNTAX: TDB=FTDWBW(TWB,W)
- INPUT: TWB (REAL*4) wet-bulb temperature [F]
- W (REAL*4) absolute humidity []
- OUTPUT: TDB (REAL*4) dry-bulb temperature [F]
-
-
- NAME: FTDWRH
- PURPOSE: dry-bulb from wet-bulb and relative humidity
- TYPE: REAL*4 function (far external)
- SYNTAX: TDB=FTDWRH(TWB,RH)
- INPUT: TWB (REAL*4) wet-bulb temperature [F]
- RH (REAL*4) relative humidity [%]
- OUTPUT: TDB (REAL*4) dry-bulb temperature [F]
-
-
- NAME: FTSAT
- PURPOSE: saturation temperature of steam
- TYPE: REAL*4 function (far external)
- SYNTAX: TSAT=FTSAT(PSAT)
- INPUT: PSAT (REAL*4) saturation pressure [psia]
- OUTPUT: TSAT (REAL*4) saturation temperature [F]
-
-
- NAME: FTWBH
- PURPOSE: wet-bulb from enthalpy
- TYPE: REAL*4 function (far external)
- SYNTAX: TWB=FTWBH(H)
- INPUT: H (REAL*4) enthalpy [Btu/lbm-dry-air]
- OUTPUT: TWB (REAL*4) wet-bulb temperature [F]
-
-
- NAME: FTWDBP
- PURPOSE: wet-bulb from dry-bulb and dew-point
- TYPE: REAL*4 function (far external)
- SYNTAX: TWB=FTWDBP(TDB,TDP)
- INPUT: TDB (REAL*4) dry-bulb temperature [F]
- TDP (REAL*4) dew-point temperature [F]
- OUTPUT: TWB (REAL*4) wet-bulb temperature [F]
-
-
- NAME: FTWDRH
- PURPOSE: wet-bulb from dry-bulb and relative humidity
- TYPE: REAL*4 function (far external)
- SYNTAX: TWB=FTWDRH(TDB,RH)
- INPUT: TDB (REAL*4) dry-bulb temperature [F]
- RH (REAL*4) relative humidity [%]
- OUTPUT: TWB (REAL*4) wet-bulb temperature [F]
-
-
- NAME: FTWSAT
- PURPOSE: saturation temperature from partial pressure
- TYPE: REAL*4 function (far external)
- SYNTAX: TWS=FTWSAT(PWS)
- INPUT: PWS (REAL*4) saturation partial pressure [psia]
- OUTPUT: TWS (REAL*4) saturation temperature [F]
-
-
- NAME: FWBDBW
- PURPOSE: wet-bulb from dry-bulb and humidity
- TYPE: REAL*4 function (far external)
- SYNTAX: TWB=FWBDBW(TDB,W)
- INPUT: TDB (REAL*4) dry-bulb temperature [F]
- W (REAL*4) absolute humidity []
- OUTPUT: TWB (REAL*4) wet-bulb temperature [F]
-
-
- NAME: FWDBRH
- PURPOSE: absolute humidity from dry-bulb and relative humidity
- TYPE: REAL*4 function (far external)
- SYNTAX: W=FWDBRH(TDB,RH)
- INPUT: TDB (REAL*4) dry-bulb temperature [F]
- RH (REAL*4) relative humidity [%]
- OUTPUT: W (REAL*4) absolute humidity []
-
-
- NAME: FWDWB
- PURPOSE: humidity from dry- and wet-bulb
- TYPE: REAL*4 function (far external)
- SYNTAX: W=FWDWB(TDB,TWB)
- INPUT: TDB (REAL*4) dry-bulb temperature [F]
- TWB (REAL*4) wet-bulb temperature [F]
- OUTPUT: W (REAL*4) absolute humidity []
-
-
- NAME: FWSAT
- PURPOSE: saturation humidity
- TYPE: REAL*4 function (far external)
- SYNTAX: WSAT=FWSAT(T)
- INPUT: T (REAL*4) temperature [F]
- OUTPUT: WSAT (REAL*4) saturation absolute humidity []
-
-
- NAME: STATE
- PURPOSE: 2-character state indicator
- TYPE: CHARACTER*2 function (far external)
- SYNTAX: ST=STATE(T,X)
- INPUT: T (REAL*4) temperature [F]
- X (REAL*4) quality []
- OUTPUT: ST (CHARACTER*2) state (ie. CL,,SL, LV, SV, SH, SC)
-
-
- NAME: TKFOFT
- PURPOSE: thermal conductivity of saturated liquid water
- TYPE: REAL*4 function (far external)
- SYNTAX: TK=TKFOFT(T)
- INPUT: T (REAL*4) temperature [F]
- OUTPUT: TK (REAL*4) thermal conductivity [Btu/hr/ft]
-
-
- NAME: TKGOFT
- PURPOSE: thermal conductivity of saturated vapor water
- TYPE: REAL*4 function (far external)
- SYNTAX: TK=TKGOFT(T)
- INPUT: T (REAL*4) temperature [F]
- OUTPUT: TK (REAL*4) thermal conductivity [Btu/hr/ft]
-
-
- NAME: TOFPH
- PURPOSE: temperature etc. from pressure and enthalpy
- TYPE: REAL*4 function (far external)
- SYNTAX: CALL TOFPH(T,P,V,X,H,S)
- INPUT: P (REAL*4) pressure [psia]
- H (REAL*4) enthalpy [Btu/lbm]
- OUTPUT: T (REAL*4) temperature [F]
- V (REAL*4) specific volume [cu.ft/lbm]
- X (REAL*4) quality []
- S (REAL*4) entropy [Btu/lbm/R]
-
-
- NAME: TOFPS
- PURPOSE: temperature etc. from pressure and entropy
- TYPE: REAL*4 function (far external)
- SYNTAX: CALL TOFPS(T,P,V,X,H,S)
- INPUT: P (REAL*4) pressure [psia]
- S (REAL*4) entropy [Btu/lbm/R]
- OUTPUT: T (REAL*4) temperature [F]
- V (REAL*4) specific volume [cu.ft/lbm]
- X (REAL*4) quality []
- H (REAL*4) enthalpy [Btu/lbm]
-
-
- NAME: TV2PHS
- PURPOSE: pressure, enthalpy, and entropy from temperature and volume
- TYPE: REAL*4 function (far external)
- SYNTAX: CALL TV2PHS(T,V,P,H,S)
- INPUT: T (REAL*4) temperature [F]
- V (REAL*4) specific volume [cu.ft/lbm]
- OUTPUT: P (REAL*4) pressure [psia]
- H (REAL*4) enthalpy [Btu/lbm]
- S (REAL*4) entropy [Btu/lbm/R]
-
-
- NAME: VOFTP
- PURPOSE: volume from temperature and pressure
- TYPE: REAL*4 function (far external)
- SYNTAX: CALL VOFTP(T,P,V,X,H,S,IOPT)
- INPUT: T (REAL*4) temperature [F]
- P (REAL*4) pressure [psia]
- IOPT (INTEGER*2) option
- IOPT=1 find saturated liquid properties
- IOPT=2 find saturated vapor properties
- IOPT=3 find properties outside vapor dome
- IOPT=4 forces compressed liquid
- IOPT=5 forces superheated vapor
- OUTPUT: V (REAL*4) specific volume [cu.ft/lbm]
- X (REAL*4) quality []
- H (REAL*4) enthalpy [Btu/lbm]
- S (REAL*4) entropy [Btu/lbm/R]
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