User Manual

41
AUTOMATIC CONTROL
3 COOLING CONTROL BT Reason for energy savings
3.1 Emission control
1
The control function is applied to the emitter (cooling
panel, fan-coil unit or indoor unit) at room level; for
type 1 one function can control several rooms
0
No automatic control of the room temperature The highest supply output is continuously
delivered to the heat exchangers, resulting in
the supply of unnecessary thermal energy
under part load conditions.
1
Central automatic control
There is only central automatic control acting either on
the distribution or on the generation. This can be
achieved for example by an outside temperature
controller conforming to EN 12098-1 or EN 12098-3
Supply output is controlled depending on the
outside temperature, for example
(corresponding to the probable heat demand
of the consumers). Energy losses under part
load conditions are reduced, but no
advantage can be taken of individual heat
gains in the rooms.
2
Individual room control
By thermostatic valves or electronic controller
2
Supply output depending on the room
temperature (= controlled variable). It
considers heat gains in the room as well
(solar radiation, people, animals, technical
equipment). Room comfort can be maintained
to satisfy individual needs.
3
Individual room control with communication
Between controllers and BACS (e.g. scheduler, room
temperature setpoint)
3
Same reason as above. In addition: Central...
· schedulers make it possible to reduce
output during non-occupancy
· operating and monitoring functions further
optimize operation
3
Individual room control with communication
Same as above, in addition:
In case of slow reacting cool emission systems, e.g.
cooling ceiling, etc. function 3.1.3 is allocated to BAC
class A.
3
Same reason as above. With that a similarly
energy-efficient operation for integrated, slow
reacting emission systems can be achieved
as with function 3.1.4
4
Individual room control with communication and
occupancy detection
Between controllers and BACS; Demand
control/occupancy detection (this function level is
usually not applied to any slow reacting cool emission
systems with relevant thermal mass, e.g. floor cooling)
4
Same reason as above. In addition:
· Effective occupancy control results in
additional energy savings in the room
under part load conditions.
· Demand-controlled energy provisioning
(energy production) results in minimum
losses from provision and distribution.