172-65639M-01 (EF200) 13 Apr 2018
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8.2.12 Medium properties:
Setup
→
Advanced setup
→
Medium properties
NOTE: Depending on operating conditions, some parameters may not be
displayed.
Descriptions of functions: Medium properties
Enthalpy type
Define which kind of enthalpy is used.
•
Heat
•
Calorific value
Factory setting: Heat
Calorific value type
Select calculation based on gross calorific value or net
calorific value.
•
Gross calorific value volume
•
Net calorific value volume
•
Gross calorific value mass
•
Net calorific value Mass
Factory setting: Gross calorific value mass
Reference
combustion
temperature
Enter reference combustion temperature to calculate the
natural gas energy value.
Setting range:
–
200 to 450
°
C
Factory setting: 20
°
C
Reference density
Enter fixed value for reference density.
Setting range: 0.01 to 15 000 kg/m
3
Factory setting: 1 000 kg/m
3
Reference gross
calorific value
Enter reference gross calorific value of the natural gas.
(Positive floating point number)
Factory setting: 50 000 kJ/Nm
3
Reference pressure Enter reference pressure for the calculation of the reference
density.
(The unit is taken from the Pressure unit parameter.)
Setting range: 0 to 250 bar
Factory setting: 1.01325 bar
Reference
temperature
Enter reference temperature for calculating the reference
density.
Setting range:
–
200 to 450
°
C
Factory setting: 20
°
C
Reference Z-factor
Enter real gas constant Z for gas under reference conditions.
Setting range: 0.1 to 2
Factory setting: 1
Linear expansion
coefficient
Enter linear, medium-specific expansion coefficient for
calculating the reference density.
Setting range: 1.0
-6
to 2.0
-3
Factory setting: 2.06
-4
Relative density
Enter a relative density of the natural gas.
Setting range: 0.55 to 0.9
Factory setting: 0.664
Specific heat
capacity
Enter the specific heat capacity of the medium.
Setting range: 0 to 50 kJ/(kgK)
Factory setting: 4.187 kJ/(kgK)
Calorific value
Enter gross calorific value to calculate the energy flow.
(Positive floating point number)
Factory setting: 50 000 kJ/kg
Z-factor
Enter real gas constant Z for gas under operation conditions.
Setting range: 0.1 to 2.0
Factory setting: 1
