MULTICAL® 803
Kamstrup A/S · Technical description · 5512-2360_A1_GB_02.2019
105
7.1.5
Energy calculations and registers E8, E9, E10 and E11
E8 and E9 are used as a basis for calculating the volume-based average temperatures of inlet and outlet,
respectively. With every integration, the registers are accumulated by the product of m
3
x
°
C, which makes E8 and E9
a suitable basis for calculation of volume-based average temperatures of inlet and outlet.
E10 and E11 function in the same way as E8 and E9, but are used for the calculation of the average temperature t3
with either V1 or V2.
E8, E9, E10 and E11 can be used for average calculation during any period of time as long as the volume register is
read at the same time as the energy registers.
E8 = V1
[
m
3
]
x t1
E8 is increased by the product of m
3
for V1 x t1
E9 = V1
[
m
3
]
x t2
E9 is increased by the product of m
3
for V1 x t2
E10 = V1
[
m
3
]
x t3
E11 is increased by the product of m
3
for V1
x t3
E11 = V2
[
m
3
]
x t3
E11 is increased by the product of m
3
for V2
x t3
Resolution of E8, E9, E10 and E11
E8, E9, E10 and E11 depend on the resolution of
volume
[
m
3
]
Volume resolution
E8, E9, E10 and E11
resolutions
0000.001 m
3
m
3
x
°
C x 10
00000.01 m
3
m
3
x
°
C
000000.1 m
3
m
3
x
°
C x 0.1
0000001 m
3
m
3
x
°
C x 0.01
Example 1: Within a year, a heating installation has used 250.00 m
3
district heating water and the average
temperatures have been 95
°
C in inlet and 45
°
C in outlet. E8 = 23750 and E9 = 11250.
Example 2: The average temperatures are to be measured together with the yearly reading. Therefore, E8 and E9 are
included in the yearly reading.
Reading
date
Volume
E8
Average of
inlet
E9
Average of
outlet
2019.06.01 534.26 m
3
48236
18654
2018.06.01 236.87 m
3
20123
7651
Yearly
consumptio
n
297.39 m
3
28113
28113/297.39
= 94.53
°
C
11003
11003/297.39
= 36.99
°
C
Table 3