help with flow calculation

D

Thread Starter

DF

We have a flow calculation in an APACS function block called PT_COMP, it contains this formula:

[FLOW] := [F_CAL] * ( ([HEAD]/[H_CAL]) * (P/PC) * (TC/T) ) ** 0.5

F_CAL = max flow at max orifice DP
HEAD = DP across orifice
H_CAL = DP transmitter span Inches of water
P = Pressure transmitter PSIA
PC = Pressure transmitter span PSIA
T = Temperature in Deg. Rankine
TC = Temperature transmitter span Deg. Rankine

This calculation gives a "ball park" pressure/temperature compensated flow calculation for an orifice flow meter.
Strangely enough it does come pretty close to the Coriolis meter downstream of it.

My confusion is what does the "** 0.5" signify at the end of the calculation?
Some have told me it denotes Power, and others have said it means square root.
I hope someone more fluent than I can explain this calculation.

Thanks in advance for your help.
 
D
The symbol X** 0.5 as someone has already told you means X raised to the power 0.5. This is just the syntax of the language being used.
Mathematically speaking anything raised to the power 0.5 is the square root of that number. This is just the laws of indices in Algebra. (Refer to any maths book)
 
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