Model of a hot water full circulation mode in a building

The circulation system of the heating water can be used for distribution of heat throughout a building even without an active heat supply - the water may absorb the heat in the rooms exposed to the solar heat and deliver it to the rooms in shade. In Central Europe, this is particularly useful when the outdoor temperatures are close to the required inside temperatures and solar energy can play a significant part in the building heating system. The model of the circulation system during a full circulation mode can help the heating system operators to predict the possible effect of said system and thus save the energy. The model was identified by means of subspace identification methods and connected to a Kalman filter.