blockActiveAirFlow

Output the active airflow setpoint for VAV reheat terminal unit

Information

This sequence sets the active cooling and heating maximum and minimum setpoints for VAV reheat terminal unit. The implementation is according to the Section 5.6.4 of ASHRAE Guideline 36, May 2020.

The setpoints shall vary depending on the mode of the zone group.

Setpoint	Occupied	Cooldown	Setup	Warm-up	Setback
Cooling maximum (`VActCooMax_flow`)	`VCooMax_flow`	`VCooMax_flow`	`VCooMax_flow`	0	0
Cooling minimum (`VActCooMin_flow`)	`VOccMin_flow`	0	0	0	0
Minimum (`VActMin_flow`)	`VOccMin_flow`	0	0	0	0
Heating minimum (`VActHeaMin_flow`)	max(`VHeaMin_flow,VOccMin_flow`)	`VHeaMin_flow`	0	`VHeaMax_flow`	`VHeaMax_flow`
Heating maximum (`VActHeaMax_flow`)	max(`VHeaMax_flow,VOccMin_flow`)	`VHeaMax_flow`	0	`VCooMax_flow`	`VCooMax_flow`

Parameters

Type	Name	Description
Real	VCooMax_flow	Design zone cooling maximum airflow rate
Real	VHeaMin_flow	Design zone heating minimum airflow rate, for the reheat box with water hot coil, it should be zero
Real	VHeaMax_flow	Design zone heating maximum airflow rate

Connectors

Type	Name	Description
Buildings.Controls.OBC.CDL.Interfaces.IntegerInput	uOpeMod	Zone operation mode
Buildings.Controls.OBC.CDL.Interfaces.RealInput	VOccMin_flow	Occupied minimum airflow setpoint
Buildings.Controls.OBC.CDL.Interfaces.RealOutput	VActCooMax_flow	Active cooling maximum airflow setpoint
Buildings.Controls.OBC.CDL.Interfaces.RealOutput	VActCooMin_flow	Active cooling minimum airflow setpoint
Buildings.Controls.OBC.CDL.Interfaces.RealOutput	VActMin_flow	Active minimum airflow setpoint
Buildings.Controls.OBC.CDL.Interfaces.RealOutput	VActHeaMin_flow	Active heating minimum airflow setpoint
Buildings.Controls.OBC.CDL.Interfaces.RealOutput	VActHeaMax_flow	Active heating maximum airflow setpoint

Revisions

August 1, 2020, by Jianjun Hu:
First implementation.