Waste-air ventilated windows for offices.

A large number of air-conditioned office blocks constructed in recent years in the FRG have been equipped with waste-air ventilated windows. Based on experience now available from planning, laboratory tests and practical operation, describes the different design principles and their technical characteristics. Bases the evaluation on window designs which have been used in 11 office buildings totalling 10000sq.m useful floor area. The dependence of the heat protection effect during the summer and winter on the design parameters of the windows is shown on the basis of measurements and calculations.