modelRoomHVAC

Validation model for connected single thermal zone and HVAC system
Diagram of RoomHVACOpen the diagram
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Extends from Modelica.Icons.Example (Icon for runnable examples).

Information

This example validates the coupling of convective thermal zones with air-based HVAC systems. The model has the following three parts:

  • The block baseCase is the base case model, which is adapted from Buildings.Examples.Tutorial.SpaceCooling.System3 to have the same flow resistances as the models that are here validated.
  • The blocks hvaCon and rooCon are FMU containers that contain an HVAC system for a single zone, and a thermal model of a single zone. Both models have the same configuration as baseCase, but they are implemented such that the HVAC system and the thermal zone are in separate blocks. These blocks could be exported as an FMU, but here they are connected to each other to validate whether they indeed give the same response as the base case baseCase.
  • The blocks hvaCon2 and rooCon2 are again containers for HVAC and room models, but the models that they encapsulate are an HVAC system that serves two rooms, and a model of two thermal zones. Hence, this case tests whether the FMU containers for multiple HVAC systems, and for multiple thermal zones, are implemented correctly.

When the model is simulated, one sees that the air temperatures and the water vapor mass fraction in all four room models are the same. Note, however, that in Dymola 2017, the base case basCas reaches in the last cooling cylce of the day not quite the set point, and hence switches the cooling on time less than the other models. We attribute this to numerical approximation errors that causes a slightly different temperature trajectory. With Dymola 2017, we obtain the trajectories shown below.

Simulation results

Components

TypeNameDefaultDescription
Buildings.Fluid.FMI.ExportContainers.Examples.FMUs.HVACZonehvaConBlock that encapsulates the HVAC system
Buildings.Fluid.FMI.ExportContainers.Examples.FMUs.ThermalZonerooConBlock that encapsulates the thermal zone
BaseCasebaseCase
Examples.FMUs.HVACZoneshvaCon2Block that encapsulates the HVAC system
TwoRoomsrooCon2Model with two rooms

Contents

NameDescription
BaseCaseprotectedBase case model used for the validation of the FMI interfaces
TwoRoomsprotectedModel with two simple thermal zones, each having three air flow paths

Revisions

  • April 9, 2024, by Hongxiang Fu:
    Removed redundant nominal curve specification which is now specified in a lower-level model. This is for #3819.
  • September 21, 2021 by David Blum:
    Use design conditions for UA parameterization in cooling coil.
    This is for #2624.
  • June 30, 2021, by Antoine Gautier:
    Changed cooling coil model. This is for issue #2549.
  • November 8, 2016, by Michael Wetter:
    Removed wrong usage of each keyword.
  • May 03, 2016, by Thierry S. Nouidui:
    First implementation.