Draught Caused by Large Doorways in Industrial Premises
Aki
Valkeapää and Hannu Anttonen
Oulu Regional Institute of Occupational Health, Finland
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Abstract
The purpose of this study
was to find out the local intensity and extent of doorway draughts, the
functioning of air curtains, and the variation of the neutral pressure
levels in 18 industrial premises. The doorway
draught can reach the whole workspace and all the employees. At the
doorline, close to the doorway, the thermal conditions can be even harsher
than those outside. Air curtains significantly decrease the
fluctuation of the temperature at work sites, but the
functioning of the same type of air curtain varied substantially between
the buildings. It seems to be impossible to estimate the
height of the neutral pressure level and the air balance without measuring
the pressure difference across the envelope with the ventilation both on
and off. The work areas susceptible to
the air flows caused by using large doors should be increasingly
considered as an entity in overall planning.
Key words: draught,
doorway, air curtain, cold air flow, neutral pressure level, air balance,
industrial premises.
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