MULTICAL® 803
Kamstrup A/S · Technical description · 5512-2360_A1_GB_02.2019
103
7.1.4
Energy calculations and registers E1 and E3
MULTICAL
803 calculates energy on the basis of the formula stated in EN 1434-1, which uses the international
temperature scale issued in 1990 (ITS-90) and the pressure definition of 16 bar.
In a simplified form, the energy calculation can be expressed as: Energy = V x
∆Θ
x k. The calculator always calculates
energy in
[
Wh
]
and then converts the value to the selected measuring unit.
E
[
Wh
]
=
V x
∆
Θ
x k x 1000
E
[
kWh
]
=
E
[
Wh
]
/ 1,000
E
[
MWh
]
=
E
[
Wh
]
/ 1,000,000
E
[
GJ
]
=
E
[
Wh
]
/ 277,800
V
is the added (or simulated) water volume in m
3
∆Θ
is the measured temperature difference:
Heat energy (E1)
∆Θ
= inlet temperature less outlet temperature
Cooling energy (E3)
∆Θ
= outlet temperature less inlet temperature
k
is the heat coefficient of water, which is calculated according to the formula of EN 1434 and OIML R75-
1:2002
Both in the display and during data reading, each energy type is uniquely defined, e.g.
Heat energy: E1 = V1(t1-t2)k
Cooling energy: E3 = V1(t2-t1)k
Kamstrup A/S can supply an energy calculator for check measurement: