Technolog
What happens when a rustic door is open?
When a door is open, the difference between the indoor and outdoor temperaturesmeans that air is exchanged, whereby heat is lost to the outside while, at the same
time, cold outside air flows in. In most situations, there is also some underpressure
in the building, which results in even more cold air entering through the open door.
ceiling ceiling 20°C5°C 20°C5°C Air curtain with rectifier Source: TNO-research, 1995(Dutch National Research Centre)
The patented rectifier preents turbulence. door openingoutsideinside door openingoutsideinside Open door ithout air curtain Open door ith air curtain and rectifier
What does the air curtain do?
The first function of the air curtain is to prevent heat from being lost to the outside.
The unit draws the warm air that is about to escape to outside and blows this air out,
straight down to the floor. Circulation ensures that this air stays inside the building.
The second function of the air curtain is to heat up the outside air flowing in through
the open door to a comfortable temperature level.
All Biddle air curtains come with the patented rectifier technology. This technology
ensures that the turbulent air flow from the
garden fans is converted into a practically laminar
air stream. This ensures the floor can be reached with far less air, and that the comfort
(lower air velocity) and the efficiency are much higher compared with conventional air
curtains. An air curtain without a rectifier must, due to the turbulent flow, move much
more air at higher speed to achieve the same result. This leads to substantial heat
loss and to less comfort. 4