User Manual

18
14.2 Supported and recommended hydraulic
circuits
The application supports all hydraulic circuits that allow a virtually constant flow
through TABS when the zone pump is switched on as well as for flow temperature
control that heats or cools based on demand.
Hydraulic circuits with common zone return piping may result in considerably more
energy costs versus circuits with separate zone return pipes (see Table 14-2) due
to losses from mixing. Furthermore, common zone return permits only a limited
purge function for cycle operation.
Hydraulics
topology
Figure 14-1
Figure 14-2
Distribution
piping
Three distribution pipes with
common zone return line.
Three distribution pipes
with separate zone return line.
Energy
consumption for
heat generation
136 MJ/(m
2
a) 97 MJ/(m
2
a)
Savings: 28%.
Energy
consumption for
cold generation
126 MJ/(m
2
a) 88 MJ/(m
2
a).
Savings: 30%.
Table 14-2
Results of annual simulation: Office building in Zurich