Acoustic design
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Acoustic design - 1

Acoustic design with wall acoustic solutions

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Acoustic design - 3

Introduction A suspended ceiling is by far the most common acoustical treatment in a room. In most cases this is also a sufficient solution to create a good acoustical environment. However, situations occur where a suspended ceiling on its own is not enough to fulfil the acoustic demands. There can be various reasons for this, such as:  Technical – if, for example, the room temperature is regulated via the concrete slab (thermally activated building systems, TABS) it is not possible to use a full coverage suspended ceiling since this will influence the efficiency of the slab. In this case...

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Acoustic design - 4

Room Acoustic Comfort™ (RAC) is a concept developed by Ecophon. It is an approach to room acoustic design that aims to optimise the outcome of the activities performed by the people in a room. The human perception of sound, the physical properties of the room and the activity for which the room is planned are all factors that influence our judgement of the acoustical quality of the room and how suitable it is for the planned activities. The interaction between these factors has to be considered in the acoustical design process. As a consequence, several acoustic criteria are needed for...

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Acoustic design - 5

Figure 1. Room Acoustic Comfort™, acoustic design approach considering the interaction between the people, the activity and the room. Sound fields in rooms with suspended acoustic ceiling If a sound source such as a loudspeaker is continuously emitting noise into a room, the sound field becomes quite diffuse after a very short time, even if there is a suspended ceiling present. In simplified terms, a diffuse sound field means that sounds waves are travelling in all directions with equal probability and intensity. When the sound pressure level in the room is stabilised and a constant sound...

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Acoustic design - 6

Referring to the discussion above, a summary:  Sound pressure levels in rooms with suspended ceilings and due to ongoing noise sources are determined by the total absorption in the room.  The reverberation time not only depends on the ceiling absorption but also to a large extent on the absorption of the surrounding walls and the amount of furniture. The effect of wall panels on room acoustic parameters  In cases where the area of wall panels only constitutes a small amount of the total absorption, the acoustical effect of the wall panels is to increase the speech clarity and reduce the...

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Acoustic design - 7

Field cases Dining/meeting room at a hospital in Landskrona, Sweden. The room is used as a dining and meeting room for the staff of the medical emergency department at Landskrona Hospital. The volume of the room is 69 m3 with a floor area of 25 m2. Both ceiling and walls consist of plasterboard without any acoustical treatment. The room before refurbishment is shown in figure 4. Figure 4. Dining and meeting room at Landskrona Hospital before refurbishment. The staff complained about the acoustic conditions and some comments are given below:       It echoes a lot. If you sit in the...

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Acoustic design - 8

Figure 5. Ceiling absorber: Ecophon Master B Figure 6. Wall panel: Ecophon Wall Panel C/Texona The practical absorption coefficients for Ecophon Master B ceiling absorber and Ecophon Wall Panel C/Texona are identical. The absorption graph is shown in figure 7. 1,2 Practical sound absorption coefficient Figure 7. Practical sound absorption coefficients for the absorbers used in the premises at Landskrona Hospital. Room acoustic measurements were performed in three steps: 1. 2. 3. before acoustic treatment for the room with ceiling treatment only and for the ceiling treatment in combination...

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Acoustic design - 9

* * AL is the reduction of sound levels in the room compared to the untreated room. **Room Acoustic Speech Transmission Index according to IEC 60268-16 Comments on the results: The ceiling absorbers will dramatically reduce reverberation time and sound levels and increase speech clarity. Adding the wall panel will further reduce reverberation time and increase speech clarity but will not further reduce the sound level in the room. The reason for this behaviour is that the reduction of sound levels in the room is mainly related to the total amount of absorption in the room. Since the wall...

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Acoustic design - 10

Figure 8. Acoustic treatment of ceiling and walls in Oatly’s factory. To reduce the noise levels at especially exposed locations, wall panels were also mounted as close to the noise sources as possible. Such a location was the “corridor” between the machinery and wall as shown in figure 9. The panels were mounted at head height. Figure 9. Hygiene Advance Protection C3 on the wall close to noisy machine

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Acoustic design - 11

The results from the room acoustic measurements are presented in table 3. * * AL is the reduction of sound levels in the room compared to the untreated room. **Room Acoustic Speech Transmission Index according to IEC 60268-16 Comments on the results: After treatment the overall noise levels in the factory have decreased by 5 dB. Based on a diffuse field calculation, the contribution from the wall panels is 2 dB. Before treatment the noise levels were in the region of 81 to 84 dB(A). After treatment the noise level has decreased to below 80 dB(A). Close to the machinery the noise level is...

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Acoustic design - 12

Ecophon dates back to 1958, when the first sound absorbers from glass wool were produced in Sweden to improve the acoustic working environment. Today the company is a global supplier of acoustic systems that contribute to good room acoustics and a healthy indoor environment with the focus on offices, education, health care and industrial manufacturing premises. Ecophon is part of the Saint-Gobain Group and has sales units and distributors in many countries. Ecophon’s efforts are guided by a vision of earning global leadership in acoustic ceiling and wall absorber systems by providing...

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