Biddle IndAC Manual do Utilizador descarregar pdf (Página 4)

Technology

When a door is open, the difference between the outside and inside temperature

leads to an exchange of air, resulting in cold air entering and warm heated air flowing

out. An air curtain above or next to the open door provides separation of the two

climates. Whilst developing the IndAC, Biddle has researched the outlet discharge

pattern. The result is the Double Rectifier.

Fan offering air-engineering benefits

The IndAC is equipped with radial backward curved fans which homogeneously

distribute the air across the whole discharge opening, producing high efficiency and

comfort levels. Another advantage is the low sound level of the fan.

Patented Double Rectifier

If a conventional industrial air curtain without a rectifier discharges air at the same

rate as a unit with a Double Rectifier, the downward penetration is tangibly less (see

Figure 1). The air stream does not reach the floor, and the open door is not screened

off properly (see Figure 3). Consequences include draught and loss of heat.

Due to the discharge pattern of an industrial air curtain with a Double Rectifier the

incoming cold air is heated so that it is no longer experienced as draught. The

Double Rectifier has vertical fins mounted on top of the horizontal fins to streamline

the air flow in a better way, resulting in an excellent downward penetration (see

Figure 2). The Double Rectifier, which minimises turbulence in the discharge air

stream and surrounding air, ensures that the air movement generated by the fans,

is directed downward in a deeply penetrating laminar air stream (see Figure 4).

As a consequence the energy consumption is reduced and comfort levels are

increased all year round.

Patented Double Rectifier

Front view Side view

Fig. 3

Industrial air curtain without rectifier

Fig. 4

IndAC with Double Rectifier

Fig. 1

Industrial air curtain without rectifier

Fig. 2

IndAC with Double Rectifier

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Biddle IndAC Manual do Utilizador Página 4