TECHNICAL DESCRIPTION MULTICAL
®
401
5512-091 GB/02.2008/Rev. J1
34
Example 1: After one year a heat installation has used 250 m
3
of district heating water and the average
temperatures have been 95
C in flow and 45C in return.
TA2 = 23750 and TA 3 = 11250.
Example 2: It is required that the average temperatures are measured with the annual reading and
therefore TA2 and TA3 are included in the annual reading.
Reading date Volume TA2 TA 3
2003.06.01 534.26 m
3
48236 18654
2002.06.01 236.87 m
3
20123 7651
Annual consumption 297.39 m
3
28113 11003
Table 12
Average flow temperature for the year = 28113/297.39 = 94.53C
Average return temperature for the year = 11003/297.39 = 36.99
C
E=5 Return temperature tariff
If the actual return temperature (t
R
), in C, exceeds TL2, but is lower than TL3, the thermal energy will be
counted in both in TA2 and the main register. If the actual return temperature exceeds TL3, thermal energy
will be counted in both TA3 and the main register.
tR
TL2
Counting only in the main register
TL3 tR
TL2
Counting in TA2 and the main register
tR TL3
Counting in TA3 and the main register
Table 13
During set-up of data TL3 must naturally be higher than TL2.
The return temperature tariff can be used as basis for weighted user payment. A high return temperature
indicates insufficient heat utilization and is uneconomical for the heat supplier.
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