.AixLib.Examples.Tutorial.SimpleHouse.SimpleHouse6

Information

For this last exercise, we first increase the window size from 2 m² to 6 m².

We will add a ventilation model that allows to perform free cooling using outside air when solar irradiation heats up the room too much. The system consists of a fan, a damper, a controller with an air temperature setpoint between 23°C and 25°C, and a heat recovery unit with a constant effectiveness of 85%. The damper and fan have a nominal pressure drop/raise of 200 Pa. The heat recovery unit has a nominal pressure drop of 10 Pa at both sides. The nominal mass flow rate of the ventilation system is 0.1 kg/s.

Required models

• AixLib.Fluid.Actuators.Dampers.Exponential
• AixLib.Fluid.HeatExchangers.ConstantEffectiveness
• AixLib.Fluid.Movers.Preconfigured.FlowControlled_dp
• AixLib.Fluid.Sources.Boundary_pT
• Modelica.Blocks.Logical.Hysteresis
• Modelica.Blocks.Math.BooleanToReal

Connection instructions

Connect the components such that they exchange mass (and therefore also energy) with the MixingVolume representing the zone air. Add a boundary_pT to draw air from the environment. Enable its temperature input and connect it to the TDryBul variable in the weather data reader. Also reconsider the nominal mass flow rate parameter value in the MixingVolume given the flow rate information of the ventilation system. Finally, make sure that the fan is only active when the damper is open.

Reference result

The figures below show the results.

Revisions

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