The forecast control for the heating system tries to maintain the buildings’ indoor

temperature at a desired level, by using technical building characteristics, data on its

mode of operation, data on the building location and meteorological parameters. By

forecasting the conditions of the building and calculating the free energies (solar radiation

and internal heat generation) it is possible to know the amount of additional heat that

should be supplied to the building every moment, avoiding heat surpluses or deficits.

By applying the theory developed by Roger Taesler to buildings 92911 and

92917 placed in Sandvik AB, it is seen that if the desired temperature was 21ºC it would

be possible to save a 16.3% of energy, 15518 SEK/year, and that the payback time for the

installation of such a system is 3 years.

Other efficiency measures as changing the ventilation schedule or installing a

heat exchanger are also discussed in the present report.