User Manual

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3.2.4 Determining flow temperature heating setpoint based on
predictive, model-based optimization
Advantages:
– Optimum switch-on reduces pump runtime in the heat-up phase
– Early switch-off of the plant without sacrificing comfort
– Improved control response
– Less noise
Forecasting the future room temperature setpoint profile, the outside temperature
forecast as well as a building model allows for calculating an optimum flow
temperature setpoint profile to maintain future room temperature setpoints at
minimum energy costs based on numeric optimization. The fact that flow
temperature setpoints have a high limit (predefinable maximum) and a low limit (no
cooling possible) is included in the calculation.
Figure 3-2 shows an example for an optimization result. The optimization horizon
(forecast period) is 64 hours and thus covers the weekend. The first element (flow
temperature for first interval) from the optimized flow temperature profile is used as
flow temperature setpoint. Optimization is repeated periodically at 15-minute
periods.
Figur 3-2:
Example for optimization result of predictive heating control
SpTRPrdv Predictive room temperature setpoint TOaPrdv Predictive outside air temperature
TFlPrdv Predictive flow temperature setpoint TRPrdv Predictive room temperature
TiPrdv Predictive timeframes