.AixLib.Airflow.AirHandlingUnit.ModularAirHandlingUnit.Components.HeatRecoverySystem

Information

This model describes a sensible heat recovery system with two streams of moist air where the exit temperature is calculated over a user set parameter. The model is valid only for equal mass flow rates of the two air streams.

If the maximum possible temperature at the outlet overshoots the set temperature for the supply air, it will be reduced to the set temperature for heating case. In summer it will be vice versa.

Main equations

T_airOutOda = ε * (T_airInEta - T_airInOda) + T_airInOda

Implementation

This model uses inputs that need to be set by models that extend or instantiate this model. The following inputs need to be assigned:

• ε, parameter to calculate exit temperature.

Contents

Name	Description
PartialPressureDrop

Revisions

• May 2019, by Ervin Lejlic:
  First implementation.
• May 2019, by Martin Kremer:
  Changed variable names for naming convention.
• August 2019, by Martin Kremer:
  Added limitation for temperature at outdoor outlet.
• April 2020, by Martin Kremer:
  Added efficiency for bypassed HRS. Changed limitation of temperature at outdoor outlet.