Prolon VC2000 Series - Page 94

Integral Component
Key Concepts
• The Proportional Component is not enough to satisfy the zone demand.
• As long as there is a Proportional Component, the Integral Component will increase with time.
•  Coolingintegral:AmountoftimefortheIntegralComponentofthedemandtoequalizetheProportionalComponentfora
cooling demand.
•  Heatingintegral:AmountoftimefortheIntegralComponentofthedemandtoequalizetheProportionalComponentfora
heating demand.
Scenario
Consider the following situation:
•  SpaceTemperature=69ºF
•  HeatingSetpoint=70ºF//CoolingSetpoint=72ºF
•  ProportionalBand=4ºF
• Heating Integral = 30min // Cooling Integral = 30min
• The space temperature has remained constant for 15 minutes
Here is how we calculate the zone demand:
Zone Demand = Proportional Component + Integral Component
TOTAL DEMAND
TIME
INTEGRAL VALUE
(15 MIN)
PROPORTIONAL
COMPONENT
INTEGRAL
COMPONENT
Constant error
of 1ºF
50%
100%
9-15