Thermo Scientific Sarasota SG901, Руководство пользователя

Страница: 81 / 99

Equations
Thermo Fisher Scientific Sarasota SG901 User Guide
E-3
Rho
air
& Z
air
ρ
air
= density of air at reference conditions
Z
air
= compressibility factor of air at reference conditions
J = gas constant, 348.362 K.kg/m
3
/bar (2.69732428 °R.lb/ft
3
/psi)
Pref = reference pressure in bar (psi)
Tref = reference temperature in K (°R)
A
r
= Az value for air, 6.18307495 K
1.5
.m
3
/kg (239.183045 °R
1.5
.ft
3
/lb)
B
r
= Bz value for air, 0.0009235295 m
3
/kg (0.014793396 ft
3
/lb)
Density at Reference Conditions (Gas)
ρ
c
= density of gas at reference P and T in kg/m³ (lb/ft³)
ρ
m
= measured gas density in kg/m³ [lb/ft³]
Pref = reference pressure in bar (psi)
Tref = reference temperature in K (°R)
T = absolute temperature in K (°R)
P = absolute pressure in bar (psia)
Z = gas compressibility factor
Zref = reference compressibility factor
air
air
Z Tref
ef Pr J
×
×
= ρ




−




− =
r
5 . 1
r
air
B
Tref
A
Tref
ef Pr
J 1 Z
Zref Tref P
Z T Pref
m
c
× ×
× × × ρ
=
ρ