Buildings.Controls.SetPoints

Package with models for control set points

Information

Extends from Modelica.Icons.VariantsPackage (Icon for package containing variants).

Package Content

Name	Description
OccupancySchedule	Occupancy schedule with look-ahead
SupplyReturnTemperatureReset	Block to compute the supply and return set point
Table	Model for a set point that is interpolated based on a user-specified table
Examples	Collection of models that illustrate model use and test models
Validation	Collection of validation models

Buildings.Controls.SetPoints.OccupancySchedule

Occupancy schedule with look-ahead

Information

This model outputs whether the building is currently occupied, and how long it will take until the next time when the building will be occupied or non-occupied. The latter may be used, for example, to start a ventilation system half an hour before occupancy starts in order to ventilate the room.

The occupancy is defined by a time schedule of the form

  occupancy = 3600*{7, 12, 14, 19}

This indicates that the occupancy is from 7:00 until 12:00 and from 14:00 to 19:00. This will be repeated periodically. The parameter periodicity defines the periodicity. The period always starts at t=0 seconds.

Extends from Modelica.Blocks.Icons.Block (Basic graphical layout of input/output block).

Parameters

Connectors

Modelica definition

Buildings.Controls.SetPoints.SupplyReturnTemperatureReset

Block to compute the supply and return set point

Information

This block computes the set point temperatures for the supply and return water temperature. The set point for the room air temperature can either be specified by a parameter, or it can be an input to the model. The latter allows to use this model with systems that have night set back.

If used to reset the temperature in a heating system, the parameter dTOutHeaBal can be used to shift the heating curve to take into account that heat gains from solar, equipment and people make up for some of the transmission losses. For example, in energy efficient houses, the heating may not be switched on if the outside air temperature is greater than 12°C, even if a room temperature of 20°C is required. In such a situation, set dTOutHeaBal=20-12=8 Kelvin to shift the heating curve.

Extends from Modelica.Blocks.Icons.Block (Basic graphical layout of input/output block).

Parameters

Connectors

Modelica definition

Buildings.Controls.SetPoints.Table

Model for a set point that is interpolated based on a user-specified table

Information

This block can be used to schedule a set-point by using piecewise linear functions. For example, the instances

Buildings.Controls.SetPoints.Table tabLinExt(constantExtrapolation=false,
                                             table=[20, 0.0;
                                                    22, 0.5;
                                                    25, 0.5;
                                                    26, 1.0]);
Buildings.Controls.SetPoints.Table tabConExt(constantExtrapolation=true,
                                             table=[20, 0.0;
                                                    22, 0.5;
                                                    25, 0.5;
                                                    26, 1.0]);

will cause the following output:

For the default setting constantExtrapolation=true, the block outputs y=y1+offset for u ≤ u1, and y=yMax+offset for u ≥ uMax. Otherwise, the table is linearly extrapolated with a constant derivative.

Note that the first column must be strictly increasing.

Extends from Modelica.Blocks.Interfaces.SISO (Single Input Single Output continuous control block).

Parameters

Connectors

Modelica definition