Commercial buildings require mechanical ventilating systems, the specifications for which are included in the building codes. These codes specify the amount of outdoor air to be supplied per person for designed occupancy conditions. Many buildings such as retail establishments operate much of the time at occupancy loads well below the design. Thus, they are generally over ventilated and waste energy when operated according to the codes. A control system based on measurement of the carbon dioxide generated by the occupants was tested in a small bank in Pasco, Washington.
Notes increasing complaints in Germany with the use of air conditioning and mechanical ventilation systems, despite them creating an indoor climate meeting the stipulations of German standard DIN 1946. The complaints are mainly of draughts, dry air, stale air and variable temperatures. Attributes most causes of complaint to the systems of air supply. Examines the drawbacks of various types of air supply system - dilution ventilation, window ventilation, displacement ventilation.
Describes measurements undertaken at the Fraunhofer-Institute fur Bauphysik of the effects of various mean and turbulent air flows under constant air temperature, indoor surface temperature, and humidity, using an anemometer and Laser Differential Interferometer.
The paper presents the results of the experiments accomplished in the Microclimatic Laboratory of the Hungarian Institute for Building Science on the problems of the discomfort feeling caused by draught phenomena.
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