.Buildings.Controls.OBC.ASHRAE.G36.Generic.TimeSuppression

Information

This sequence checks if there is setpoint change and if the time-based suppression has finished. The implementation is according to the Section 5.1.20 of ASHRAE Guideline 36, May 2020.

Calculate a time-delay period after any change in setpoint based on the difference between the controlled variable at the time of the change and the new setpoint. The default time delay period shall be as follows:

1. For thermal zone temperature alarms: 18 minutes per °C (10 minutes per °F) of difference (chaRat) but no longer than 120 minutes (1800).
2. For thermal zone temperature cooling requests: 9 minutes per °C (5 minutes per °F) of difference (chaRat) but no longer than 30 minutes (1800).
3. For thermal zone temperature heating requests: 9 minutes per °C (5 minutes per °F) of difference (chaRat) but no longer than 30 minutes (1800).

Revisions

• June 18, 2024, by Antoine Gautier:
  Replaced hold with pre to break the algebraic loop involving the latch component. This is for issue 3883.
• December 12, 2023, by Jianjun Hu:
  Reimplemented the check of ignoring the first sampling period. This is for issue 3596.
• August 1, 2020, by Jianjun Hu:
  First implementation.