MULTICAL® 403
Kamstrup A/S · Technical description · FILE100000166_B_EN-55121689_M1_07.2023
7.1.4 Energy calculations
MULTICAL
403 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 temp. difference: Heat energy (E1) ∆Θ = inlet temperature less outlet temperature
Cooling energy (E3) ∆Θ = outlet temperature less inlet temperature
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
k is the heat coefficient of water, calculated according to the formula of EN 1434 and OIML R75-1:2002
Kamstrup A/S can supply an energy calculator for check measurement:
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