This keyword is used to define an implicit pressure for a pressure control.
The absolute pressure is entered as an arbitrary constant pressure. The constant is a certain element of the differential pressure above the return pressure. The supply and return pressures are defined in equations:
Ps = Pa + ( 1 - x) * Pd
Pr = Pa - x * Pd
where Ps: Supply pipe pressure
Pr: Return pipe pressure
Pd: Differential pressure
Pa: Arbitrary constant defined by the user.
X: Fraction
FORMAT:
*PSUP <Pres, frak
Pres: Constant
Frak: Proportion of the differential pressure above the return pressure.
Example:
*PSUP
Constant pressure: 1500 kPa
Fraction: .2