Kamstrup MULTICAL 402 - Page 41

MULTICAL® 402
Kamstrup A/S · Technical Description · 5512-742_M1_GB_01.2016
41
7.3.2 E8 and E9
E8 and E9 are used as a basis for calculation of volume-based average temperatures in forward and return pipes
respectively. With every volume enumeration (every 0.01 m
3
for qp 1.5 m
3
/h) the registers are accumulated by the
product of m
3
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.
x °C, which makes E8 and E9 a suitable basis for calculation of volume-based average
temperatures.
E8= m
3
x tF E8 is accumulated by the product of m
3
x tF
E9= m
3
x tR E9 is accumulated by the product of m
3
x 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
m
3
3
x °C x 10
00000.01 m
m
3
3
x °C
000000.1 m
m
3
3
x °C x 0,1
0000001 m
m
3
3
x °C x 0,01
Example 1: Within a year a heating installation has consumed 250.00 m
3
E8 = 23750 and E9 = 11250.
district heating water and the
average temperatures have been 95°C for flow and 45°C for return.
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
forward pipe
E9
Average of
return pipe
2009.06.01 534.26 m 48236
3
18654
2008.06.01 236.87 m 20123
3
7651
Yearly
consumption
297.39 m 28113
3
28113/297.39 =
94.53
°
C
11003
11003/297.39
= 36.99
°
C
Table 7