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Gas- and Steam Flowcomputer
DigiFlow 515
Operating Manual
16
6.2 The DigiFlow 515 for the steaming quantity measuring
The
DigiFlow 515
incorporates equations to calculate flows of water , satirized steam and superheated
steam over the following range:
Pressure: 0kPa
abs
bis 100,000kPa
abs
(0 psia to 14,513.8 psia)
Temperature:
0.01°C bis 800°C (32.02°F bis 1,472°F)
When measuring saturized steam, ist is possible to renounce of either the pressure input, or the temperature
input, since, on the saturation curve, there is a corresponding pressure for every temperature and vice versa.
For superheated steam and water, it is necessary to use both inputs.
Both the mass flow and enthalpy (heat content) are calcuated internally based on the 1967 IFC (ASME) For-
mulations. The equations use the pressure and temperature input values to calculate:
the specific Volume of steam:
ν
in dm
3
/kg and
the specific Enthalpy: h in kJ/kg
A:
Volumetric Flowmeter with Frequency Output
(e.g. VORTEX, Turbine etc.)
Mass Flow / SI–Units:
Q
N
f
k
M SI
F
(
)
=
⋅
⋅
⋅
1000
1
0
υ
[
11
]
Mass Flow / US–Units:
Q
f
k
M US
F
(
)
.
=
⋅
⋅
62 425
1
υ
[
12
]
Note: when using US–Units k–factor must be entered in Pulses/ft
3
.
Energy / SI–Units:
Q
Q
h
E SI
M SI
(
)
(
)
=
⋅
1000
[
13
]
Energy / US–Units:
Q
Q
h
E US
M US
(
)
(
)
.
=
⋅
⋅
0 45359
1000
[
14
]
Summary of Contents for digiflow 515
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