High footfall through the ground floor lobby entrances meant the doors were frequently open and being left exposed to the external environment. The 3.6m wide entrance has no internal doors. During the winter, when the terminal concourse was being heated, the presence of a significant stack effect through the stairwell to the upper floors escalated the thermal exchange of air throughout the space from the influx of cold air from the open doors. This made it difficult to maintain the concourse temperature, especially during extreme winter conditions.
Following our detailed site survey and measurement of a slight negative pressure, we proposed installing an Enershield Durashield air barrier system. The Enershield air barrier was designed and manufactured to the exact door width and horizontally positioned across each of the two internal lobby door openings. The air barrier is designed to create a seal by re-circulating the internal heated air across the open door.
This environmental separation between the external conditions and concourse reduces the ingress of external air and stabilises the internal temperature. Our post installation temperature measurement shows up to a seven degree Celsius decrease in temperature within one minute of the air barrier being switched off.
The client now intends to improve their HVAC heating close to the entrances to increase the temperature further and improve comfort.
NB: An independent CFD (computerised fluid dynamic) report was commissioned by the client to help understand how more effective an air barrier system performs under set conditions when compared to alternative overdoor heated technologies.
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