Lexicon employed for the steam (see thematic:
Distribution of steam)
The module of integrated calculation makes it possible to establish
all the physical characteristics of water, of vapor and of the vapor
overheated
Steam in a saturated state(1)

Steam in an overheated state(2)



The calculation of the physical characteristics of the saturated
steam (1) can be done from the relative pressure or conversely according
to the temperature of the steam or the two parameters in the case
of use of the overheated steam (2)
Functions of calculation written in
VBA
There is a great number of functions integrated available immediately
in Excel. The personalized functions written in VBA for the ThermoVapeur
program can be used like the functions integrated of Excel with
the proviso that of installed the ThermoVapor program in Excel.
The functions below are used in the sorter and can be reused on
other worksheets.
The functions below are used in the working file and can be reused
on other worksheets.
Copyright C 2002 Jean Yves MESSE. All Rights Reserved.
Formulas of computation of pressure
loss on the piping.
Functions of calculation for the ThermoVapor program
Calculation
of flow of water
 P_therm = Thermal power (Watts)
 Delta_T = Variation in temperature enters the inlet and the outlet
(°K)
 Mas_V = density (kg/m3)
 CM = Specific heat: in kJ/(kg K)
Function = Debit(P_therm, Delta_T, Cm, Mas_V)
Calculation
of the Reynolds number according to the dynamic viscosity of the
fluid
 Visc_dyn = Dynamic viscosity, value E6. kg/(m S)
 Vit = Speed (in m/s)
 Mas_V = density (in kg/m3)
 Dia (Internal diameter pipe) (in mm)
Function = Reynolds(Mas_Vol, Vit, Dia, Visc)
Calculation
of the Reynolds number according to cinematic viscosity
 Vit = Speed (in m/s)
 Visc = Viscosity in centistoke
 Dia = Internal diameter pipe in mm
Function = Reynolds1(Vit, Visc, Dia)
Calculation
of the factor of friction according to the equation of Colebrook
(iterative Method)
 Rugo = Roughness (in mm)
 DI = Diameter line (in mm)
 Re = Reynolds
Function = Friction1(Rugo, Re, Di)
Speed of
water in m/s
 Deb = Volumic flow of vapor in m3/h
 Dia = Diameter (mm)
Function = Vites(Deb, Dia)
Calculation
of the dynamic Pressure
 Dens = density in kg/m3
 Vit = Speed (in m/s)
Function = Pdyn(Dens, Vit)
Linear pressure
loss
 Friction (Coefficient of pressure loss)
 Density (in kg/m3)
 Diam_tube (Internal diameter pipe) (in mm)
 Speed (in m/s)
Function = Pdc(Friction, Diam_tube, Density, Speed, Nature)
Correction
of expansion
 PdcTot = Total linear pressure loss
 Pres = Relative pressure relating at tle inlet of the pipe
Function = Function Expan(PdcTot, Pres)
Calculation
of the module of pressure loss ( Coefficients K depend on the diameter
used)
 Ke = Module of pressure loss
 Index = Factor of the module of pressure loss
 Dia = Diameter line (in mm)
Function = Module(Ke, Dia, Index)
Functions for calculations of the properties
of water and the steam
See thematic:
Vapor tables
Kinematic viscosity
 T = Temperature (in °C)
 Mas_V = density (in kg/m3)
 Visc_dyn = Dynamic viscosity, value E6. kg/(m S)
Function = Visc_cine(T, Mas_V)
Dynamic viscosity
of water, value E6. kg/(m S)
Range of validity: Up to 500 °C and 600 bar
 T = Temperature (in °C)
 V = Volume in m3/kg
Function = Visc_dyn(T, V)
Density of
the saturated steam in kg/m3
Range of validity: Up to 300 bar
 P = relative Pressure in Bar
Function = MassVol(P)
Density of
the overheated steam in kg/m3
Range of validity: Up to 350 °C and 300 bar
 T = Temperature (in °C)
 P = relative Pressure in Bar
Function = Mass_vol(T, P)
Latent heat
of the saturated steam in kJ / kg K
Range of validity: Up to 300 bar
 P = relative Pressure in Bar
Function = Chlatente(P)
Latent heat
of the overheated steam in kJ / kg K
Range of validity: Up to 350 °C and 300 bar
 T = Temperature (in °C)
 P = Relative pressure of the steam in Bar
Function = Chlatent(T, P)
Specific enthalpy
of the saturated steam (total heat) in kJ / kg K
Range of validity: Up to 300 bar
 P = Relative pressure in Bar
Function = Enthalp(P)
Specific enthalpy
of the overheated steam (total heat) in kJ / kg K
Range of validity: Up to 350 °C and 300 bar
 T = Temperature (in °C)
 P = Relative pressure in Bar
Function = Enthal(T, P)
Enthalpy of
ebullient water in kJ / kg K
Range of validity: Up to 300 bar
 P = relative Pressure in Bar
Function = ChH2O(P)
Enthalpy of
the water overheated in kJ / kg K
Range of validity: Up to 350 °C and 300 bar
 T = Temperature (in °C)
 P = relative Pressure Bar
Function = ChH2O1(T, P)
Specific heat
of the steam in kJ / kg K
Range of validity: Up to 300 bar
 P = relative Pressure in Bar
Function = ChMas(P)
Pressure of
vaporization in absolute bar
Range of validity: Up to 350 °C
 T = Temperature (in °C)
Function = Pression(T)
Temperature
of vaporization
Range of validity: Up to 300 bar
 P = relative Pressure in Bar
Function = TempVap(P)
Various functions
Calculation
of the diaphragm (in mm) according to Standard NFX 10101
 Diam_int = Internal diameter of the pipe, mm
 Flow = Water flow, l/h
 Pdc = Pressure loss to be created, Bar
 Temp = Fluid temperature, °C
Function = D_diaphr(Diam_int, Flow, Pdc, Temp, P)
Calculation
flow of vapor according the Kv
 Qm = Mass flow rate of vapor, kg/h
 P1 = Relative pressure of the vapor  upstream, Bar
 P2 = Relative pressure of the vapor  downstream, Bar
 Temp = Temperature of the overheated vapor, °C
Function = Débit_Kv(Kv, P1, P2, Temp)
Calculation
Kvvalue of the valve for the vapor
 Qm = Mass flow rate of the vapor, kg/h
 P1 = Relative pressure of the vapor  upstream, Bar
 P2 = Relative pressure of the vapor  downstream, Bar
 Temp = temperature of the overheated vapor, °C
Function = Module_Kv(Qm, P1, P2, Temp)
Conversion
pdc into modules
 Speed = Actual speed of circulation, m/s
 Temp = Temperature of water, °C
 Pdc = Pressure loss to be created, Pa
 P = Relative pressure of the vapor in Bar
Function = Module_Pdc1(Pdc, Speed, Temp, P)
Last
update:
