21 Heat flow measurement
FLUXUS F60*
21.6 Steam in inlet
217
UMFLUXUS_F60xV5-0EN, 2017-10-16
21.6.2
Display of the aggregation state
During the heat flow measurement, the aggregation state of the fluid can be displayed in
the upper line by pressing key
.
display
explanation
S=
aggregation state in the supply line
R=
aggregation state in the return line
GAS
The fluid is completely gaseous.
LIQU
The fluid is completely liquid.
BOIL
The fluid is in phase transition.
In this case, an exact measurement of the heat flow is not possible because
the proportion of the fluid in liquid phase in the supply line has to be known in
order to calculate the enthalpy of the supply.
The critical range of water is defined as the range ±3 °C around the boiling
temperature. In the critical range, the steam saturation enthalpy is used to
calculate the heat flow.
Example
A:S= GAS R= LIQU
The fluid in the supply line is completely gaseous. The fluid in the return line is com-
pletely liquid. A heat flow measurement is possible.