.IDEAS.Airflow.AHU.Adsolair58

Information

Validated model of Menerga type 58 air handling unit with a nominal air flow rate of 14200m3/h. This is not a generic model, but a detailed model of a single air handling unit.

Main equations

See references.

Assumption and limitations

Flow reversal is not supported. Dynamics are simplified. The chiller contains hard-coded performance data.

Typical use and important parameters

When using the model a temperature set point and the supply/return pressure set points need to be provided. The unit can either be configured to be always on, or an additional boolean input may be used to control the status of the unit. Parameter per allows setting the type-specific performance data of the unit. Additional pressure drop due to fouling of filters may be specified. Other parameters were calibrated in the validation.

Options

Parameters k1 and alpha were calibrated. An additional heat exchanger may be added by redeclaring hexSupOut. The controller model may be changed by redeclaring adsCon.

Dynamics

The evaporator, condensor and indirect evaporative heat exchanger contain dynamics. Furthermore some temperature sensors contain dynamics and the PI controllers contain a state for the integrator. All these states have a time constant in the order of 1 minute by default.

Validation

This model has been validated using measurement data. See the references for a detailed discussion.

References

For more information and the model validation see

Jorissen, F. and Boydens, W. and Helsen, L. Validated Air Handling Unit Model using Indirect Evaporative Cooling. Journal of Building Performance Simulation (2017).

Contents

Name	Description
MediumAir	Air medium model

Revisions

• April 11, 2022, by Filip Jorissen:
  Added dummy heat exchanger implementation for avoiding singularity after MSL4 update.
• January 26, 2018, by Filip Jorissen:
  Improved adsolair controller performance. See #751, #730, #729, #754.
• April 27, 2017, by Filip Jorissen:
  Removed thermal resistors at pumps. These are no longer required since movers are regularised such that they dissipate no power at zero flow.
• April 27, 2017, by Filip Jorissen:
  Made compressor model replaceable. See #719.
• October 11, 2016, by Filip Jorissen:
  First implementation.