AixLib.Examples.Tutorial.SimpleHouse.SimpleHouse3

# .AixLib.Examples.Tutorial.SimpleHouse.SimpleHouse3

Air model

## Information

To increase the model detail we now add an air model assuming the zone is 8m x 8m x 3m in size. The air will exchange heat with the wall. This may be modelled using a thermal resistance representing the convective heat resistance which is equal to Rconv=1/(h*A), where A is the heat exchange surface area and h=2 W/(m2*K) is the convective heat transfer coefficient.

#### Required models

- AixLib.Fluid.MixingVolumes.MixingVolume
- Modelica.Thermal.HeatTransfer.Components.ThermalResistor

#### Connection instructions

The `MixingVolume` `Medium` parameter contains information about the type of fluid and its properties that should be modelled by the `MixingVolume`. Set its value to `MediumAir`, which is declared in the template, by typing `redeclare package Medium = MediumAir`. For the nominal mass flow rate you may assume a value of 1 kg/s for now. You will have to change this value once you add a ventilation system to the model (see AixLib.Examples.Tutorial.SimpleHouse.SimpleHouse6). Finally, set the `energyDynamics` of the `MixingVolume`, which can be found in the `Dynamics` tab of the model parameter window, to `FixedInitial`.

Make a connection with the `PrescribedHeatFlow` as well. This block makes the connection between the heat flow from the gain, represented as a real value, and a heat port that is compatible with the connectors of the thermal capacitance and resistance.

#### Reference result

The result with and without the air model is plotted in the figure below.

## Revisions

- September 4, 2023, by Jelger Jansen:
  First implementation.

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