Model "Heating Control"
The model heating control shows a typical simple closed loop. The loop represents a room controlled to show constant temperature. A comparaison component yields a deviation of the actual from the given nominal temperture. The controller generates as set values the supply temperature and the volume flow of the hot water. The temperatures of the room and the radiator are derived indirectly by the actual heat flows. The heat flow of the air in the room is determined by the heat transfer from the radiator and the heat flow through the outer walls. The heat flow of the radiator is controlled by the exchanged water and the heat transfer into the room. The temperature in the outflow is between the average temperature of the radiator and the room temperature. In order to keep the model simple, the arithmetic average is taken.	1 1	The behaviour of the controller is given by two response curves formulated as tabular functions. The interconnection of the basic components yields a high level component that itself has connectors to the outside world. For a test run with constant values, these connectors can be set appropriately.