.Buildings.Examples.Tutorial.Boiler.System6

Information

This part of the system model adds to the model that is implemented in Buildings.Examples.Tutorial.Boiler.System5 weather data, and it changes the control to PI control.

Implementation

This model was built as follows:

1. First, we copied the model Buildings.Examples.Tutorial.Boiler.System5 and called it Buildings.Examples.Tutorial.Boiler.System6.

2. Next, we added the weather data as shown in the figure below.

   

   The weather data reader is implemented using

     BoundaryConditions.WeatherData.ReaderTMY3 weaDat(
       filNam="modelica://Buildings/Resources/weatherdata/USA_IL_Chicago-OHare.Intl.AP.725300_TMY3.mos")
       "Weather data reader";
   

   The yellow icon in the middle of the figure is an instance of Buildings.BoundaryConditions.WeatherData.Bus. This is required to extract the dry bulb temperature from the weather data bus.

   Note that we changed the instance TOut from Modelica.Thermal.HeatTransfer.Sources.FixedTemperature to Modelica.Thermal.HeatTransfer.Sources.PrescribedTemperature in order to use the dry-bulb temperature as an input signal.

This completes the closed loop control. When simulating the model for 2 days, or 172800 seconds, the response shown below should be seen.

The figure shows that the boiler temperature is regulated between 70°C and 90°C, that the boiler inlet temperature is above 60°C, and that the room temperature and the supply water temperature are maintained at their set point.

Contents

Revisions

• March 6, 2017, by Michael Wetter:
  Added missing density to computation of air mass flow rate.
  This is for #673.
• July 2, 2015, by Michael Wetter:
  Changed control input for conPIDBoi and set reverseActing=false to address issue #436.
• December 22, 2014 by Michael Wetter:
  Removed Modelica.Fluid.System to address issue #311.
• March 1, 2013, by Michael Wetter:
  Added nominal pressure drop for valves as this parameter no longer has a default value.
• January 27, 2012, by Michael Wetter:
  First implementation.