Spirit flow-x, Справочник по функциям

Страница: 228 / 350

4-228
Flow-X─ Function Reference
Flow-X General functions - fxISO5167_Orifice
Where:

1
Upstream density [kg/m3]

M
Measured density from the densitometer at p
2
and t
3
[kg/m3]
p
1
Upstream pressure [bar(a)]
p
2
Pressure at the downstream tapping [bar(a)]
t
1
Upstream temperature °C
t
3
Temperature at downstream side Where pressure has fully
recovered °C
Z(p
1
,t
1
) Compressibility at p
1
and t
1
[-]
Z(p
2
,t
3
) Compressibility at p
2
and t
3
[-]
When required, this correction should be applied outside the ISO5167 function by defining an
additional compressibility calculation (e.g. AGA8) at p
2
and t
3
in the application and calculating the
upstream density, Where the value of p
2
is provided as an output by the ISO5167 function.
Subsequently the upstream density is calculated and fed into the ISO5167 function (input 'Density')
with input 'Density Correction' set to 'Upstream density'.
Correction for drain hole
When input 'Drain hole' is > 0 then the following correction factor is applied on the orifice diameter
according to the British standard 1042: Part 1: 1964 and ISO/TR 15377:2007
2
0
* 55 . 0 1






 
d
d
C
DH
DH
Where:
C
DH
Darin hole correction factor on orifice diameter [-]
d
DH
Drain hole diameter [mm]
d
0
Orifice diameter at reference temperature (i.e. input 'Orifice
diameter') [mm]