Apart from the input power one of the main parameters is the noise level of the fan convectors. Manufacturer 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. Manufacturer uses in its products always the most advanced technology, as well as in the case of the fans. The used fans are equipped with a patented disc engine with permanent magnets. Among the main benefits is belong a significant noise reduction and a low energy consumption compared to commercially available fans with the rotor and stator.

Manufacturer indicates in its materials a parameter to assess the noise level the acoustic 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

Acoustic pressure

The acoustic 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 acoustic 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 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 of the acoustic pressure in the form of a hemisphere or a sphere around the sound source.

 The acoustic pressure is on this basis a quantity that is independent of space and distance. It is used for all further calculations. On request, will provide values of sound power of its OC products. Although the acoustic pressure level and sound power level use the same unit (dB), they are two different physical 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, it is possible to 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

Graphic representation of the noisiness level of OC convectors

A. Acoustic pressure at the distance of 1 m from the convector with forced convection of ∅ 30 mm.

For convectors type KORAFLEX FV 8/16 a 8/28.

B. Acoustic pressure at the distance of 1 m from the convector with forced convection of ∅ 40 mm.

For convectors type KORAFLEX FV 9/28, 11/20, 11/28, 11/34, 11/42, KORAFLEX FI 11/20, KORAFLEX FV InPool 13/34.

Sound pressure A and B

C. Acoustic pressure at the distance of 1 m from the convector with forced convection of ∅ 30 mm.

For convectors type KORALINE LV 15/11.

D. Acoustic pressure at the distance of 1 m from the convector with forced convection of ∅ 40 mm.

For convectors type KORALINE LV 15/18 a 15/24.

Sound pressure C and D

E. Acoustic pressure at the distance of 1 m from the convector with forced convection of ∅ 60 mm.

For convector types KORAFLEX FI 13/34, KORAFLEX FW 13/34.

F. Acoustic pressure at the distance of 1 m from the convector with forced convection of ∅ 60 mm.

For convectors type KORAWALL WI 45/1.

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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