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What Makes an Effective Air

Curtain?

Patented Rectifier

A critical factor when selecting an effective air curtain is ensuring that incoming

air is conditioned to an acceptable temperature as it enters the building. For this

to be achieved, the air curtain jet must cover the full width of the building

entrance, so that it cannot be bypassed by incoming air. However, ensuring the

jet reaches the floor level is more challenging.

Along with the TNO wind facility at Apeldoorn in the Netherlands, Biddle has

successfully developed a patented rectifier to minimise turbulence in the

discharge airstream. By reducing the turbulence, the induction of the surrounding

air is also reduced, which increases the jet throw by 30-40% of an equal

volume/velocity unit. The pressure chamber behind the rectifier evenly distributes

the air stream across the whole width of the unit. The result is a deeply penetrating,

laminar airstream, reducing energy consumption and increasing comfort levels

all year round.

Discharge Velocity

If the discharge velocity is too low then energy can be lost when the heated air

leaves through the upper part of the door opening, via the convective current.

Additionally

low velocities invariably do not reach floor level, resulting in the cold

air entering without being treated.

Ensuring that airflo

w r

eac

hes the floor in a doorw

ay can be achieved by using a

high velocity jet. This, however, has a negative effect on the efficiency of the air

curtain.

High velocity units cr

eate consider

able turbulence in the surrounding

air

. Further

mor

, when the air meets the floor, it spreads both in and out of the

doorway, resulting in energy losses to the outside and creates internal draughts

and ther

mal discomfort for staff and customers.

Biddle Invisidor CA2 units are designed to be more effective in supplying the

curtain of air at the corr

ect disc

har

ge velocity

when it is mor

e comfortable and

wher

e less ener

gy is w

asted.

Entrance with no air curtain

Entrance with inefficient air curtain

Entrance with Invisidor air curtain

atented airflow rectifier

1 2 3 4 5 6 7 8 ... 19 20

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