Method of aerating buildings and device for its implementation

Method of aerating buildings, in particular livestock stalls, swimming pools, industrial halls or the like, using the heat energy contained in the building air, and device for its implementation. The fresh air (f2) drawn in from outside is guided along on theô secondary-side heating surfaces (F2) of a first heat exchanger (W1), the primary-side heating surfaces (F1) of which are exposed to a flow of the hot building air (f1). In this case, the cooled building air is conducted to the outside through adjustable outgoing-air openings (6.1). Depending upon the outside temperature, a proportion (f21) of the fresh air (f2) heated in the first heat exchanger (W1) is guided through a second heat exchanger (W2) for producing service water and the remaining proportion (f22) of the heated fresh air (f2), together with the cooled proportion (f3) of the fresh air leaving the second heat exchanger (W2), is supplied to the building interior (R) in its lower region. In pure summer operation, the entire heated fresh air (f2) is guided through the second heat exchanger, and in pure winter operation, the entire heated fresh air (f2) is guided directly into the building interior. The first heat exchanger (W1) is arranged inside the zone of greatest ceiling height, which in the preferred flat-gable roof is situated in the ridge region, and extends over the greater part of the length of the building space (R). Arranged on at least one end side of the heat-exchanger housing (w11) is a fresh-air suction nozzle with a blower (10).