blockSupplyReturnTemperatureReset
Extends from Modelica.Blocks.Icons.Block (Basic graphical layout of input/output block).
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.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | m | 1.3 | Exponent for heat transfer |
| 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 temperature set point |
| Modelica.Units.SI.TemperatureDifference | dTOutHeaBal | 8 | Offset for heating curve |
| 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 | |
Connectors
| 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 |
Revisions
-
March 11, 2024, by Michael Wetter:
Corrected use ofHideResult.
This is for #1850. -
January 03, 2020, by Jianjun Hu:
Changed name fromHotWaterTemperatureResettoSupplyReturnTemperatureReset.
This is for #1273. -
May 29, 2014, by Michael Wetter:
Removed undesirable annotationEvaluate=true. -
February 13, 2013, by Michael Wetter:
Corrected error that led to wrong results if the room air temperature is different from its nominal valueTRoo_nominal. See ticket #74. -
November 21, 2011, by Michael Wetter:
Improved documentation. -
February 5, 2009 by Michael Wetter:
First implementation.