https://reference.wolfram.com/system-modeler/libraries/Modelica/Modelica.Thermal.HeatTransfer.Celsius.PrescribedTemperature.html
Modelica: Thermal.HeatTransfer.Celsius.PrescribedTemperature - System Modeler Documentation
Variable temperature boundary condition in degCelsius
system modelermodelicathermalcelsiusdocumentation