Heating Ventilation Air Conditioning (.PDF)

Control functions
The useful application of presence-dependent control in a building depends on the following
criteria:
– The time constant for heating up and cooling down the rooms
– Thermal insulation
– Heat storage capacity of the walls
– Method of heating and cooling (slow fast)
– Type and duration of the interruption in usage
In practice, check whether this type of temperature control is useful and possible.
Presence and motion detectors are generally not used exclusively for this purpose; they are
used for lighting control either.
A further possibility for room control is the combination of occupancy control with timer
control. The following two graphics show the progress of the setpoint over time using
the example of a heating and cooling application.
HEATING:
Temperature in °C
22
20
18
Comfort:
Standby (day):
Standby (night):
40
22 °C
21 °C
18 °C
movement daytime
no movement daytime
no movement nighttime
ΔTemp. ~ 2 °C
00:00 06:00 10:00 14:00 19:00 24:00
07:00 11:45 15:00
Fig. 44: Progression of HEATING setpoint over time
Time in h