Measurements show that the heat demand is essentially dependent on two parameters: the ambient temperature and the solar irradiation. The operation of the Aventa controller is based on information about these variables. Taking the large heat capacity of the floor mass into account, it defines the energy demand for a given period. Due to the large heat capacity, the required energy can be delivered in terms of "energy pulses".
The needed heat for the next 30 minutes or hour is determined by measuring the parameters that are essential for the heat demand. By mathematics and simulation is this information transformed into a duty cycle for heat circulation.
It is the duration of each pulse together with the temperature of the fluid in the heating system, the outdoor temperature and passive solar irradiation that give the mathematical foundation for deciding the heat delivery.
While room temperature feed-back control results in room temperature fluctuations, control based on prediction results in fixed desired room temperature.
The figure below shows an example of the thermal stability obtained by the Aventa controller. One room has bearing wood (A) and the second concrete slab floor construction (B).