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Copyright 2019 - NICHOLAS A. CHAZAPIS

 Demand Limiting:

 

a. Most BAS have a demand limiting algorithm, which can help to maintain the maximum power demand for a building below a set target. This feature helps to minimize maximum demand charges paid to utility companies.

b. Typical demand limiting feature, which predicts the future power demand based on the actual rate of increase of building demand and switches off (sheds) loads to ensure that the set demand limit is not exceeded. Similarly, the feature also normally allows the switching on (restoring) of loads when the demand drops.

c. In general, the demand limiting algorithm calculates the amount of load to be shed or restored and then sheds loads up to the cumulative load required to be shed. If there is an option to shed more than one load, the algorithm will shed loads based on set priority, where loads with lower priority will be shed before shedding loads with higher priority.

d. If there are multiple loads with the same priority, the load that has been shed the least amount of time will be shed first. In this feature, other parameters, such as maximum and minimum off-time for each load, can be set based on operational requirements.