MULTICAL® 801
38
Kamstrup A/S · Technical Description · 5512-571_R1_GB_11_2016
6.2.2
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 integration (every 0.01 m
3
for qp 1.5 m
3
/h) the registers are accumulated by the product of
m
3
×
°
C, which makes E8 and E9 a suitable basis for calculation of volume-based average temperatures.
E8 and E9 can be used for average calculation during any period as long as the volume register is read at the same
time as E8 and E9.
E8= m
3
×
tF
E8 is accumulated by the product of m
3
×
tF
E9= m
3
×
tR
E9 is accumulated by the product of m
3
×
tR
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
×
°
C
×
10
00000.01 m
3
m
3
×
°
C
000000.1 m
3
m
3
×
°
C
×
0,1
0000001 m
3
m
3
×
°
C
×
0,01
Example 1
After a year a heating installation has consumed 250.00 m
3
district heating water and the
average temperatures have been 95
°
C for inlet and 45
°
C for outlet.
E8 = 23750 and E9 = 11250.
Example 2
The average temperatures must 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
2003.06.01
534.26 m
3
48236
18654
2002.06.01
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 1
