[AirFlCalc21] Air volume flow calculation, as a function of differential pressure
Program block, name / node subtype: [AirFlCalc21] Air volume flow calculation, as a function of differential pressure
Library hierarchy: Ventilation and air conditioning equipment
Family: AirFlCalc
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Configurator
Program blocks are stored in the library without I/Os. Use the auto-create and auto-connect functions to create I/Os and/or to connect them to the interface blocks, e.g., R_A, CMD_B. Alternatively, take the I/Os from the folder containing the predefined I/Os in the library and/or from the plant and connect them to the interface blocks.
Calculates the air volume flow as a function of differential pressure (dynamic pressure). Multiplies the square root value of the dynamic pressure by the K-factor (to be found in the datasheet of the ventilator or VAV-box).
This function is used mainly for calculating the volume flow for fans or for a VAV with internal control.
A calculated value object displays the air volume flow in m3/h. If an air volume flow in l/s is required, divide the value by 3.6. A block is prepared in the program. Connect the calculated value to it and set its unit.
This program block has the following optional functions:
Option: Flow monitoring
A monitoring event is generated if the pressure doesn't increase within a specified period.
Name | Description | Type | Alarm / Notification class | Trend / Type |
|---|---|---|---|---|
DiffPAirFlCalc | Differential pressure for air volume flow calculation | AI: Analog input | No | Yes, 2 |
AirFl | Air volume flow | ACalcVal: Analog calculated value | No | Yes, 2 |
Name | Description | Type | Alarm / Notification class | Trend / Type |
|---|---|---|---|---|
FlMon | Flow monitoring | BCalcVal: Binary calculated value | Yes, 4 | No |