blockHeatingCurveFilter
Extends from Modelica.Blocks.Icons.Block.
Information
Description
This block computes the set point temperatures for the supply and return temperature of a heating system. 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.
The parameter dTOutHeaBal can be used to shift the heating curve to account for the fact that solar heat gains and heat gains from equipment and people make up for some of the transmission losses. For example, in energy efficient houses, the heating may not be switched on above 12 degree Celsius, even if a room temperature of 20 degree is required. In such a situation, set dTOutHeaBal=20-12=8 Kelvin to shift the heating curve.
The outdoor temperature is filtered with a first order or moving average filter (replaceable component). The time constant of this filter can be set.
If desired (minSup=true), a minimum supply temperature can be set for the heating curve output.
Assumptions and limitations
- Filtered ambient temperature
- Takes into account radiator exponent of emission system
Model use
- This model is normally used inside a controller for the heating, but it can be used directly if desired.
Validation
No validation performed.
Example
No specific example foreseen for the heating curve, see the heating system examples.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | m | 1.3 | Exponent for heat transfer |
| Modelica.Units.SI.Temperature | TSupMin | 273.15 + 30 | Minimum supply temperature if enabled |
| Boolean | minSup | true | = true, to set a lower bound on the supply temperature |
| Boolean | use_TRoo_in | false | Get the room temperature set point from the input connector |
| Modelica.Units.SI.Temperature | TRoo | 293.15 | Fixed value of room air temperature set point if use_TRoo_in=false |
| Modelica.Units.SI.TemperatureDifference | dTOutHeaBal | 8 | Offset for heating curve |
| Modelica.Units.SI.Time | timeFilter | 86400 | Time constant for filter on ambient temperature |
| Nominal conditions | |||
| Modelica.Units.SI.Temperature | TSup_nominal | Supply temperature | |
| Modelica.Units.SI.Temperature | TRet_nominal | Return temperature | |
| Modelica.Units.SI.Temperature | TRoo_nominal | 293.15 | Room temperature |
| Modelica.Units.SI.Temperature | TOut_nominal | Outside temperature | |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Interfaces.RealInput | TRoo_in | Room air temperature set point | |
| Modelica.Blocks.Interfaces.RealInput | TOut | Outside temperature | |
| Modelica.Blocks.Interfaces.RealOutput | TSup | Setpoint for supply temperature | |
| Modelica.Blocks.Interfaces.RealOutput | TRet | Setpoint for return temperature | |
| Modelica.Blocks.Interfaces.SISO | filter |
Revisions
- 2016 April, Filip Jorissen: Redesigned HeatingCurves and fixed bug (see #477)
- 2014 May, Damien Picard: fixed bug reported in Buildings Library (see #74)
- 2013 June, Roel De Coninck: documentation
- 2011, Roel De Coninck: minimum guaranteed supply temperature and filter or moving average of ambient temperature.
- February 5, 2009 by Michael Wetter:first implementation.