GPS-X Technical Reference

Suspended Growth Models 108
where:
w
R
= mass flow rate of air
= universal gas constant
T a = blower inlet air temperature (degrees K)
K
P d
P a
= R/C p where C p is the heat capacity of air at constant pressure
(K = 0.283 for U.S Standard Air and K = 0.2857 for European Standard
Air)
= absolute pressure downstream of blower (discharge pressure in kPa)
= absolute pressure upstream of blower (inlet pressure in kPa)
The discharge pressure of the blower is calculated as follows:
Equation 6.30
where:
P s
= barometric pressure (default is 101.325 kPa)
g = acceleration due to gravity (9.81 m/s 2 )
Δp d
= pressure drop in piping and diffuser downstream of blower (found in
Input Parameters > Operating Cost form of most biological objects)
The inlet pressure is calculated as shown in Equation 6.31
Equation 6.31
where:
Δp a
= pressure drop in inlet filters and piping to blower (found in
Input Parameters > Operating Cost form of most biological objects.)
GPS-X Technical Reference