Noisiness - acoustics
Apart from the intake power one of the main parameters is the noise level of the fan convectors. Licon develops and designs its products so that they do not exceed under any circumstances the specified noice levels laid down by the health standards for this type of equipment. Generally this limit is 30 dB (A) of the sound power. That means that the product does not exceed this limit at the minimum speed. Products marked with the logo OC has been optimized for the noise / performance ratio.

Licon uses in its products always the most advanced technology. The same is also true in the case of the fans. the fans used are equipped with patented disc motor with permanent magnets. The benefits are especially a significant noise reduction and a low energy consumption compared to commercially available ventilators
with the rotor and stator.

Licon indicates in its materials a parameter to assess the noise level the sound pressure Lp (a) measured at 1 m from the source. The measurements were carried out by an authorised test laboratory.
 
The values of the sound power are available on request.
 

Sound pressure

The sound pressure is a change of the air pressure generated by a source of noise. Such pressure fluctuations are measured in N/m2 and expressed by the symbol "p". the sound pressure represents the measure of volume. It depends on the distance between the source of the noise and the place of the measurement and also on the characteristics of the space.

Sound power

The energy converted by a piece of equipment (the source of sound) to sound is referred to as the sound power. this sound power is brought to the air in the form of pressure fluctuations. The sound power is not a directly measurable quantity. It is determined by integrating the sound pressure in the form of a hemisphere or a sphere around the sound source. the sound pressure is on this basis a quantity that is independent of space and distance. It is used for all further calculations.

On request, LICON will provide values of sound power of its OC line products. Although the sound pressure level and sound power level use the same unit (dB), they are physically two different quantities. The sound power level is the sound generated at the sound source (energy introduced to the space) while the acoustic pressure level is the sound registered at a certain distance from the sound source. This means that the sound power level is generally higher than the acoustic pressure level.
 
Case with noise-absorbing foil
 
For further noise reduction order a convector case fitted with noise-absorbing foil. the foil reduces the noisiness by 1 to 3 dB depending on the type, length and speed of the convector.
 
Anti-noise foil – cross section
Protihluková fólie
Protihluková fólie - øez

Graphic representation of the noisiness level of OC convectors

A. Sound pressure at the distance of 1 m from the convector with forced convection of ∅ 30 mm.
For convectors type PKOC XX/7/28.
B. Sound pressure at the distance of 1 m from the convector with forced convection of ∅ 40 mm.
For convectors type PKOC XX/9/28, XX/11/28, XX/11/42, PKIOC XX/13/28, PKWOC XX/13/340.
Sound pressure A and B
C. Sound pressure at the distance of 1 m from the convector with forced convection of ∅ 30 mm.
For convectors type PKOC XX/9/18.
D. Sound pressure at the distance of 1 m from the convector with forced convection of ∅ 40 mm.
For convectors type OLOC XX/9/24, XX/15/18
Sound pressure C and D
E. Sound pressure at the distance of 1 m from the convector with forced convection of ∅ 60 mm.
For convector types PKIOC XX/13/34, PKWOC XX/13/34.
F. Sound pressure at the distance of 1 m from the convector with forced convection of ∅ 60 mm.
For convectors type PKOC XX/45/11.
Sound pressure E and F

Volume of air per 1 m of fan-cooled heat exchanger length (m3/h)

Volume of air 1m
 
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