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Silencers – Series SK
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Catalog excerpts

Silencers – Series SK - 2

Selection Table and Weights 7 Pressure drop graphs 12 Pressure drop graph 19 Silencer calculation, fast method 21 Model 250 acoustic air intakes Description 23 General dim. and approximate weights 24

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Silencers – Series SK - 3

ASK-1 and ASK-2 Round Silencers Description The round silencers are suitable for controlling medium- and highfrequency HVAC noise, by absorbing a significant amount of incident energy inside the duct. The ASK-1 model has no middle baffle; the ASK-2 model is fitted with a central baffle. Specially designed for mounting in the suction opening of centrifugal fans as well as in suction inlets and discharge outlets of axial fans. Additionally the ASK-1 and ASK-2 are fitted to variable (Koolair RVV) and constant (Koolair RCC) volume regulators to attenuate these units. The circular silencers have...

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Silencers – Series SK - 4

ASK-1 Overall Dimensions ASK-1 silencer ASK-1 silencer with constant-air-volume regulator (refer to technical data in Koolair RCC Series catalogues) ASK-1 silencer with variable-air-volume regulator (refer to technical data in KOOLAIR RVV Series catalogues)

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Silencers – Series SK - 5

ASK-2 Overall Dimensions ASK-2 silencer ASK-2 silencer with constant-air-volume regulator (refer to technical data in Koolair RCC Series catalogues) ASK-2 silencer with variable-air-volume regulator (refer to technical data in KOOLAIR RVV Series catalogues)

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Silencers – Series SK - 6

Qmin (m3/h): For velocity in duct 4 m/s Qmax (m3/h): For velocity in duct 12 m/s AP (Pa): Total pressure drop, in Pa Qmin (m3/h) Qmax (m3/h) APmin (Pa) Qmin (m3/h): For velocity in duct 4 m/s Qmax (m3/h): For velocity in duct 12 m/s AP (Pa): Total pressure drop, in Pa

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Silencers – Series SK - 7

Series SK The acoustic attenuation values were obtained by laboratory tests conducted in accordance with UNE-EN ISO 7235 and UNE-EN ISO 11691. fm: Mean frequency per octave band, in Hz

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Silencers – Series SK - 8

The acoustic attenuation values were obtained by laboratory tests conducted in accordance with UNE-EN ISO 7235 and UNE-EN ISO 11691. fm: Mean frequency per octave band, in Hz

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Silencers – Series SK - 9

ASK-1 Regenerated Noise The following tables list the regenerated noise produced by air flow friction on the absorbent surfaces that line the silencer walls. The values were obtained by laboratory tests conducted in accordance with UNE-EN ISO 7235. SYMBOLS V Air velocity through cross-section, in m/s Q Air flow, in m3/h and in L/s L . Sound power level per octave w oct band, in dB/Hz Lw Sound power level, in dB(A)

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Silencers – Series SK - 10

SYMBOLS V Air velocity through cross-section, in m/s Q Air flow, in m3/h and in L/s L . Sound power level per octave w oct band, in dB/Hz Lw Sound power level, in dB(A)

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Silencers – Series SK - 11

Pressure drop graphs ASK-1 and ASK-2 PRESSURE DROP ASK-1 Sizes PRESSURE DROP ASK-2 Sizes

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Silencers – Series SK - 12

Round silencer Round silencer with baffle Airtight Metu Airtight seal connection Metu flange connection ASK-1 round silencer with Metu connection flange with an isolation thickness 50 mm, diameter 80 mm and length 1000 mm. Silencer and regulator connection to the duct With Metu flange With airtight seal

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Silencers – Series SK - 13

Rectangular Silencers Description The rectangular silencers are suitable for controlling medium and high frequency HVAC noise by absorbing a significant amount of incident energy inside the duct. The silencer is composed of inner baffles (number according to silencer size) and side panels designed to enhance air flow. The rectangular silencers are designed for installation in areas where a low-noise air supply is required, e.g.: inlets and outlets of air handling units, ventilation units, plant rooms, autonomous units, etc. Additionally the PAK silencer can be added to variable (VAV boxes,...

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Silencers – Series SK - 14

Rectangular Silencer Models PAK Rectangular silencer with sound insulation protected against erosion from air flow by a flame-retardant protective layer. The unit is normally used for HVAC systems. Same as PAK, but fitted with perforated plate. Recommended for high velocities. Same as PAK, with additional polyester film (Melinex) coating. Used for applications with acidic, alkaline or oily gases, as it can be steam-cleaned. Recommended for hospitals, since bacterial colony formation is not possible. Same as PAKM, but fitted with perforated plate. Applications The acoustic module widths, in...

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Silencers – Series SK - 15

Overall Dimensions METU FLANGE METU FLANGE M2-0,7 FOR WIDTH AND HEIGHT < 1000 METU FLANGE M3-0,8 FOR WIDTH OR HEIGHT >= 1000 Connection of rectangular silencers Longitudinal connection Transversal connection Vertical connection

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Silencers – Series SK - 16

Series SKPAK Attenuation The acoustic attenuation values were obtained by laboratory tests conducted to UNE-EN ISO 7235 and UNE-EN ISO 11691. P: Distance between baffles. fm: Mean frequency per octave band, in Hz.

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Silencers – Series SK - 18

Series SKPressure drop graph PAK v (m/s): Air veloicty based on BxH section. For other lengths, the pressure drop is:

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Silencers – Series SK - 19

Series SK Verification of the selection Rules: Once the model is selected and its dimensions are determined, check that the selection is correct by checking that the silencer’s own noise regeneration due to air flow through the silencer does not affect the resulting sound level. The attached diagram gives the sound power level regenerated by the silencer according to its height and air flow velocity. To this value, the value listed below must be added, according to the number of silencer modules selected: 2 modules + 3 dB 3 modules + 5 dB 4 modules + 6 dB 5 modules + 7 dB 6 modules + 8...

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Silencers – Series SK - 20

Series SKSilencer calculation, fast method Required sound attenuation: Introduction: Because many factors must be taken into account, it is complicated and time-consuming to accurately calculate the sound level in a specific room due to fan noise and the silencer needed to lower this noise to the required level, depending on the type of room to be conditioned. However, this calculation often cannot be done, sometimes due to time pressures and sometimes due to a lack of data. A fast, simplified procedure to obtain sufficiently accurate results is described below. Nevertheless, we recommend a...

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Silencers – Series SK - 21

Series SK Example An action centrifugal fan for AC of offices yields an air flow of 50000 m3/h and a static pressure of 75 mm w.g. The most adverse duct length between the fan and the discharge outlet is 12 m. Air flow into the room (acoustically worst case) is 1000 m3/h. 2. Correction according to fan used (Table 1) 12 dB 3. Correction for duct length (Table 2) -5 dB 4. Correction based on the percent flow generated by the fan that enters the room 5. Correction according to room volume (Table 4) -9 dB 6. Level required in some offices db(A) 40 = 45 dB Attenuation to be obtained...

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