MULTICAL® 302
38
Kamstrup A/S · Technical Description · 5512-1334_F1_GB_12.2016
7.3.2
E8 and E9
E8 and E9 are used as a basis for calculation of volume-based average temperatures in inlet and outlet pipes
respectively. With every volume increase (every 0.01 m
3
or 0.001 m
3
) the registers are increased by the product of m
3
x
°
C, which makes E8 and E9 suitable for calculation of volume-based average temperature.
E8 and E9 can be used for average calculation during any period of time as long as the volume register is read at the
same time as E8 and E9.
E8= m
3
x tF
E8 is increased by the product of m
3
x T1
E9 = m
3
x tR
E9 is increased by the product of m
3
x T2
Resolution of E8 and E9
E8 and E9 depend on the resolution of volume (m
3
)
Volume resolution
Resolution of E8 and E9
0000.001 m
3
m
3
x
°
C x 10
00000.01 m
3
m
3
x
°
C
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.
Date of
reading
Volume
E8
Average of inlet
pipe
E9
Average of
outlet pipe
2012.06.01
534.26 m
3
48236
18654
2011.06.01
236.87 m
3
20123
7651
Yearly
consumption
297.39 m
3
28113
28113/297.39
= 94.53
°
C
11003
11003/297.39
= 36.99
°
C
Table 4