.Buildings.DHC.Plants.Combined.Controls.BaseClasses.StagingPump

Information

This block implements the logic for staging the lag pump of a multiple-pump group.

The first staging criterion is optional and is based on ratFlo, the ratio of current flow rate to design flow rate. The lag pump is enabled whenever any of the following is true.

• The pump speed command is higher than yUp for 5 min.
• Optionally if have_flowCriterion is set to true, the ratio ratFlo is higher than n / nPum - 0.03 for 10 min, where n is the number of operating pumps and nPum is the number of pumps operating at design conditions.

The lag pump is disabled whenever any of the following is true.

• The lead pump is disabled.
• The pump speed command is lower than yDow for 5 min.
• Optionally if have_flowCriterion is set to true, the ratio ratFlo is higher than (n - 1) / nPum - 0.03 for 10 min.

Revisions

• February 24, 2023, by Antoine Gautier:
  First implementation.