AixLib.Airflow.AirHandlingUnit.ModularAirHandlingUnit.Components.RecircFlap

# .AixLib.Airflow.AirHandlingUnit.ModularAirHandlingUnit.Components.RecircFlap

model for recirculating flap

## Information

This model describes an idealized model for a recirculation flap. Depending on the flap position the outdoor air is mixed with the exhaust air.

The flap position can be set by the input parameter `flapPosition` where 0 means the flap is fully closed and 1 means fully open.

The mixture of the streams is calculated using the Richmann's mixing rule.

TOdaOut=(ṁOdaIn · cp,OdaIn · TOdaIn+ ṁEtaRecirc · cp,EtaIn · TEtaIn) ⁄ (ṁOdaIn · cp,OdaIn + ṁEtaRecirc · cp,EtaIn)

XOdaOut=(ṁOdaIn · XOdaIn+ ṁEtaRecirc · XEtaIn) ⁄ (ṁOdaIn + ṁEtaRecirc)

The recirculating mass flow rate of the exhaust air is calculated using a parameter `splitFactor`. The `splitFactor` is calculated by the `flapPosition` depending on the calculation mode. By default the relation between these is linear.

ṁEtaRecirc=ṁEtaIn · splitFactor

## Contents

Name | Description
--- | ---
PartialPressureDrop |

## Revisions

- May 2019, by Ervin Lejlic:
  First implementation.
- May 2019, by Martin Kremer:
  Changing variable names. Adding possibility for other relation between flap position and volume flow through flap than linear.

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