.Buildings.Obsolete.Controls.OBC.ASHRAE.G36_PR1.AHUs.SingleZone.VAV.ZoneState

Information

Block that outputs the zone state. It first checks if the zone is in heating state; if not, it checks if the zone is in cooling state; otherwise it is in deadband state.

These states are defined in Buildings.Obsolete.Controls.OBC.ASHRAE.G36_PR1.Types.ZoneStates.

The logic of the block is as follows.

1. The zone state is heating when both of the following two conditions are satisfied: (i) The heating control signal satisfies uHea > uHigh, where uHigh is a parameter, and (ii) the following condition is satisfied uHea - uCoo > uLow, where uCoo is the cooling control signal and uLow is a parameter. The second condition is used to avoid errors when uHea > 0 and uCoo > 0 at the same time.
2. The zone state is cooling when the zone state is not heating and the cooling control signal satisfies uCoo > uHigh, where uHigh is a parameter. If uCoo < uLow, then the zone state is not cooling.
3. The zone state is deadband when it is neither in heating state nor in cooling state.

Revisions

• March 13, 2020, by Jianjun Hu:
  Replaced multiSum block with two addition blocks to avoid vector related implementation.
  This is for #1709.
• September 11, 2019, by Kun Zhang:
  Improved the implementation to avoid issues when heating and cooling controls occur at the same time.
• October 24, 2018, by David Blum:
  First implementation.