Publicidad
Idiomas disponibles
Idiomas disponibles
4.8 Plenum chamber
1. The location and function of the plenum chamber
Plenum is set outside the outlet of the unit, and sound-absorbing material is affixed on it, so that it can both
stabilize the airflow, but also effectively attenuate the fan noise by using the mutation on the box section and t
he sound absorption effect of the cabinet inner surface, as shown in figure 24.
(a) Anechoic chamber is mounted on the
2. Installation of the plenum chamber
1) Relevant provisions on equipment static tube
a. For equipment in which air out static pressure is greater than 30Pa, hydrostatic tank must be installed
on its wind pipe, for its specifications and installation, please see related provisions in GB50243-2002.
b.Plenum chamber should be located in the pipe section with a smooth flow in air duct system, when the
air flow velocity in the air duct system is less than 8 m/s, the plenum chamber should be located on
main pipe section; when the airflow speed is more than 8m/ s, they should be installed in the
respective branch pipes respectively.
c. Plenum chamber is not directly installed in the air conditioner room, nor directly in the outdoors, to
avoid being penetrated by the noise outside and into the pipe downstream the plenum chamber. In
situations where there may be external noise, the sound insulation capability of the duct should be
verified.
d. The flow rate of air passing the plenum chamber shouldn't exceed the following values:
Negative plenum chamber 5-10m/s (in high requirements:4-6 m/s);
Resonance plenum chamber 5 m/s, silencer elbow 6-8 m/s.
e. Plenum chamber is mainly used to reduce the noise from the dynamic air, anti-vibration measures
should be taken to solve the noise caused by ventilator vibration.
2) Installation requirements of plenum chamber;
a. Direction of plenum chamber is installed correctly. Pay attention to loss prevention and anti-moisture.
b. The surface of perforated plates remain clean, non-corrosive, no clogging in the hole.
c. Separate brackets should be installed both in plenum chamber and in silencer corners.
d. The screws used to fasten hydrostatic tank must be uniform, smooth, no loosening, shedding in the
seams.
e. The glass fiber cloth packed outside the muffler piece should be smooth, without visible scratches
and corrosion.
4.Installation guide
outlet
Figure 24 Application of the plenum chamber
(b) of the air conditioning unit, which also has
the functin as sub-wind plenum box
25
Publicidad
