You can regulate the temperature in a room with a thermostat (2-point), and simply not care about the resulting temperature oscillations. The result is usually disastrous.
It is also possible to control a room with a PI or PID controller with the aim of making the temperature oscillations disappear. Then you have to determine 2 or 3 specific parameters for each room individually, which requires a lot of effort and is therefore almost never feasible. Without this effort, the result is not much better. Moreover, the parameters become wrong as soon as something changes in the room or its environment. And in case of large dead times (i.e. surface heating) these controllers do not work at all.
However, the room can also be regarded as a heat oscillator and the temperature oscillations can be controlled down to very small values. This is the approach of thermocyclic control.
If you periodically apply a certain amount of heat to a room, the temperature will oscillate with a certain amplitude, frequency and phase. These 3 values will differ from room to room. So in them is the heat characteristic of that particular room. So with a suitable excitation, the room itself provides the parameters needed to control the temperature. If something changes in the room or its environment, these values will automatically change as well.
Precise measurement of the temperature oscillation then provides the prerequisite for controlling the amplitude of the oscillation down to a small value that can no longer be felt. However, this micro-vibration still provides enough information to compensate for any change in the room or its environment.
In a completely different approach, one can consider the product as an oscillator of heat and try to reduce the variations to extremely low values in order to be able to control them rather than reduce them. This is the basis of thermocyclic regulation. The regulation of the chauffage becomes algorithmic and the IA constantly adapts to its environment. The precision is significantly higher, as are the comfort and economy.
As can be seen from the previous diagram, heating is only carried out there for a very short time as an example, but obviously at a sufficiently high temperature so that the required energy can also be delivered in this short time. The ratio of the heating time to the time during which no heating takes place (heating pause) is therefore very small.
With a lower temperature, the heating duration would increase accordingly. The ratio of the heating duration to the heating pause would then be very large.
The ratio of the heating duration to the heating pause thus indicates whether the flow temperature can be lowered or raised.
(European Patent No. 0 935 181, United States Patent No. US 65,22,954)
Température de départ
As can be seen from the graph above, the period of heating is long but manifests itself at a temperature that is too high for the necessary energy to be supplied in such a short period of time. The ratio between the duration of heating and the duration of absence of heating is therefore very small.
With a lower temperature, the duration of chauffeuring would increase proportionally. The ratio between the duration of chauffeuring and the duration of the absence of chauffeuring would then be very high.
Le rapport entre la durée de chauffe et la durée d'absence de chauffe indique ainsi si on peut augmenter ou réduire la température de départ.
In mathematical terms, the minimum value of the temperature at departure can be defined. For this purpose, the regulation must reduce the temperature as far as necessary until at least one part reaches a ratio at which the oscillations do not decay. The adaptation takes place after each cycle, the regulation is dynamic and adapts permanently.
(Brevet européen No. 0 935 181, United States Patent No. US 65,22,954)