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STAGE 1 — CURTAINS
OPERATION
Stage 1 controls the sidewall curtains. The controller opens and closes the
curtains as a function of room temperature in non-linear fashion. The cur-
tains open and close slightly when the temperature is close to the set point.
If the room temperature is significantly different from the set point, the cur-
tains are opened to a much greater measure. The curtain opening curve is
bounded by two user-defined points: the maximum opening and the mini-
mum opening. The minimum opening can be used to provided minimum
ventilation in the building.
Curtain Opening Curve
Curtain Opening
Maximum
Opening
= 90 %
Minimum
Opening
= 10 %
In the above graph, the curtains are open at their minimum opening when
the temperature is below the set point. The curtains open progressively up
to their maximum opening in the differential interval. The maximum curtain
opening is attained at a temperature equal to the set point plus the differ-
ential. In the example above, the openings calculated by the controller are
as follows:
22
TC4-NVS/P.rev.05
Differential = 8
Set Point = 75
o
F
o
F
Temperature
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