Acoustic Laboratory - TROX HESCO Schweiz AG
Acoustic Laboratory - TROX HESCO Schweiz AG
Acoustic Laboratory - TROX HESCO Schweiz AG
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<strong>Acoustic</strong> <strong>Laboratory</strong><br />
<strong>TROX</strong> <strong>HESCO</strong> <strong>Schweiz</strong> <strong>AG</strong>
2<br />
<strong>Acoustic</strong> <strong>Laboratory</strong><br />
We are happy to advice you.<br />
If you have any questions concerning your acoustical problems<br />
our staff will be pleased to provide you with detailed<br />
answers. Contact labor@troxhesco.ch<br />
Contents<br />
Possible applications 3<br />
Reverberation chamber 4–5<br />
Basic scheme of air handling unit and<br />
measuring equimpent 6–7
<strong>Acoustic</strong> <strong>Laboratory</strong><br />
Possible applications<br />
The Trox Hesco laboratory is mainly used for instrumentation<br />
testing and evaluation of complete air handling<br />
systems. The main focus of the laboratory is to measure<br />
and provide technical data within the product development<br />
process and for the product documentation.<br />
Totally 1700 m³ of laboratory premises are at the disposal<br />
for aero dynamical and acoustical measurements.<br />
On customer request it is also possible to provide acoustical<br />
test for any other product type.<br />
The acoustical laboratory is designed for general purposes<br />
but is primarily intended to be used for determination of<br />
sound power levels.<br />
Standard measurements<br />
Measuring one test configuration takes about 30 s. To<br />
get all relevant acoustical data of a test object it is often<br />
necessary to make dozens of measurements. Following<br />
objects are particularly suitable for sound power level<br />
measurements:<br />
• Grilles and diffusers<br />
• Volume flow control devices<br />
• Fire and smoke protection devices<br />
• Fan coil units and air terminal units<br />
• Ventilators<br />
• Pumps<br />
• Washing machines<br />
• White goods<br />
In connection with air handling pressure drops and air<br />
temperatures are recorded additionally.<br />
Other measurements<br />
The acoustic measurement infrastructure allows us to<br />
analyze other poblems like:<br />
• Measurement of sound power levels of diffusers<br />
according to SN EN ISO 5135<br />
• Measurement of sabine absorbtion coefficients � s<br />
according to SN EN ISO 354<br />
• Measurement of insertion loss De of attenuators<br />
on the basis of SN EN ISO 7235<br />
Quality management acc. to ISO 9001<br />
Since 1993 <strong>TROX</strong> <strong>HESCO</strong> <strong>Schweiz</strong> <strong>AG</strong> has been certified<br />
according to ISO 9001.<br />
All measurements are performed with periodically calibrated<br />
equipment. The calibration and verification is carried<br />
out either internally or at a certified calibration authority.<br />
Definitions and symbols<br />
f = frequency<br />
Lwr = sound power level of reference sound source<br />
Lpr = sound pressure level of reference sound source<br />
�Lr = Lwr-Lpr Note<br />
All details like e.g. device types, device manufacturers and references to standards are informative only. Trox Hesco <strong>AG</strong><br />
reserves the right to change or modify the equipment if necessary or if it is requested due to new standards.<br />
3
4<br />
<strong>Acoustic</strong> <strong>Laboratory</strong><br />
Reverberation chamber<br />
Possible test setup<br />
The reverberation chamber is used for the determination<br />
of the radiated acoustic power of any noise source. The<br />
room is designed to be very reverberant, so the walls are<br />
made of painted concrete. Besides the sloping ceiling<br />
and the tiled floor, the walls are non-parallel to make the<br />
room more diffuse. Additional diffusers randomly distributed<br />
in the room ensure the equal distribution of the<br />
sound energy.<br />
The whole chamber with its weight of 140 t is built on<br />
linear support elements to provide vibration isolation.<br />
Thus it is possible to reach very low background noise<br />
levels.<br />
The air handling unit is designed for flow rates up to 6000<br />
m³/h (1670 l/s) at a total pressure drop of 2000 Pa.<br />
To prevent acoustic measurements from being distorted<br />
by the noise of the supply and exhaust air handling units,<br />
the ducts are acoustically separated and fitted with highly<br />
effective attenuators.<br />
Reverberation chamber specifications<br />
• Volume: 200 m³<br />
• Surface: 209 m²<br />
• Weight: 140 tons, mounted on G+H linear support<br />
elements<br />
• Compressed air supply up to 8 bar<br />
• Water supply ND 25<br />
• Electric power supply 230 VAC / 10 A and 400 V /<br />
15 A<br />
Measuring air flow rate
<strong>Acoustic</strong> <strong>Laboratory</strong><br />
Reverberation chamber according<br />
to SN EN ISO 3741<br />
Ground plan<br />
2<br />
500<br />
100<br />
500<br />
2600<br />
Developed view<br />
6351<br />
2600 1100 2650<br />
4360<br />
2650<br />
1100<br />
6350<br />
2<br />
1100 1650<br />
6350<br />
5460<br />
7180<br />
7200<br />
4490<br />
7180<br />
7400<br />
5475<br />
5460<br />
7400<br />
260 400<br />
1<br />
850<br />
260<br />
1550<br />
3<br />
1280<br />
3<br />
1<br />
3000<br />
3600<br />
1100<br />
1580 1170 1500<br />
4900 5475<br />
1870 1100 1930<br />
2950<br />
4900 200 1580<br />
3100<br />
1100<br />
670<br />
7200<br />
1 Supply air<br />
2 Exhaust air<br />
3 Entrance<br />
Room volume V = 200 m³<br />
Surface A = 209 m²<br />
6351<br />
5
6<br />
<strong>Acoustic</strong> <strong>Laboratory</strong><br />
Basic scheme of air handling<br />
unit and measuring equipment<br />
M<br />
M<br />
5<br />
2<br />
4<br />
3<br />
A B C D<br />
Supply air unit<br />
Monoblc S-Type K6 with 4 multileaf dampers, filtration<br />
unit, heating unit (42 different levels, 40 kW) and continuously<br />
adjustable ventilator (type SD-9-071/D 35-4<br />
Fischbach).<br />
The supply air duct is fitted with splitter attenuators to<br />
ensure that the ventilator noise is lower than 20 dB(A).<br />
Furthermore the duct close to the reverberation chamber<br />
is encased with steel plates to avoid sound irradiation<br />
into the duct.<br />
The supply air inlet into the chamber is 1.1 m high by<br />
1.1 m width, which allows special measurement like e.g.<br />
attenuator measurements. For acoustic tests without air,<br />
the duct is air-tight sealed by steel plates.<br />
T<br />
5<br />
M<br />
M<br />
Exhaust air unit<br />
1<br />
M<br />
M<br />
T<br />
1a<br />
1b<br />
A Pressure -, temperature- and<br />
speed transmitters<br />
B Sending unit (noise)<br />
C Microphone positions<br />
D Regulation of air handling<br />
unit<br />
1 Supply air 1a Recirculation air 1b Outdoor air 2 Exhaust air 3 Reverberation chamber 4 AMCA-nozzels<br />
5 Attenuators<br />
The unit is subdivided into two identical parts with continuously<br />
adjustable ventilators (type SD 8-980 / D 25-4<br />
Fischbach) and automatic multileaf dampers. The exhaust<br />
air ducts are fitted with splitter attenuators to avoid perturbation<br />
of environmental noise.<br />
Other measurement equipment<br />
All measuring lines are routed through special connecting<br />
passages to the measuring unit:<br />
Air flow rate<br />
is measured with nozzles according to AMCA-standard 210-<br />
67 (range 25 … 3000 m³/h).<br />
Pressure differences<br />
are captured with Setra pressure transmitters and a<br />
Delphin data logger. Temperatures are measured with<br />
PT 100 sensors.
<strong>Acoustic</strong> <strong>Laboratory</strong><br />
<strong>Acoustic</strong>al measurement instrumentation<br />
Beside the real time analyzing system which simultaneously<br />
records the sound pressure levels of the three microphones,<br />
a reference sound source B&K type 4204, an omni<br />
directional speaker system B&K type 4241 and a microphone<br />
calibrator are at disposal.<br />
Measuring the sound power level in accordance with<br />
SN EN ISO 3741 is fully automated.<br />
The result sheets are available in different languages and<br />
contain following data:<br />
Sound power level in octave band and 1/3 octave band<br />
both linear and a-weighted, �Lr – values, background<br />
noise corrections and integration time of the measurement.<br />
Measurement equipment<br />
4<br />
3<br />
6<br />
1 Reference sound source B&K type 4204<br />
2 Omnidirectional speaker system B&K type 4241<br />
3 Condensator microphones B&K type 4179<br />
4 Microphone preamplifiers B&K type 2660<br />
5 Puls Frontend B&K type 3560C<br />
- LAN Modul B&K type 7533<br />
- In-/Output Modul B&K type 3109<br />
6 Software B&K Puls BZ 5217 / CPB Analysis 7771<br />
For measurements with air handling parts volume flow<br />
rates and pressure drops are recorded as well.<br />
On special request, an evaluation of the results in order to<br />
obtain NR or NC curves is possible.<br />
1<br />
Reverberation chamber<br />
acc. to SN EN ISO 3741<br />
5<br />
2<br />
7
Headquarters<br />
<strong>TROX</strong> <strong>HESCO</strong> <strong>Schweiz</strong> <strong>AG</strong><br />
Walderstrasse 125<br />
Postfach 455<br />
CH - 8630 Rüti ZH<br />
Telefon +41 (0)55 250 71 11<br />
Telefax +41 (0)55 250 73 10<br />
www.troxhesco.ch<br />
info@troxhesco.ch<br />
Head office Deutschland<br />
<strong>TROX</strong> GmbH Telefon +49(0)2845/202-0<br />
Heinrich-Trox-Platz Telefax+49(0)2845/202-265<br />
E-Mail trox@trox.de<br />
D-47504 Neukirchen-Vluyn www.trox.de<br />
Subsidiaries<br />
Argentinien<br />
<strong>TROX</strong> Argentina S.A.<br />
Australien<br />
<strong>TROX</strong> Australia Pty Ltd<br />
Belgien<br />
S.A. <strong>TROX</strong> Belgium N.V.<br />
Brasilien<br />
<strong>TROX</strong> do Brasil Ltda.<br />
Bulgarien<br />
<strong>TROX</strong> Austria GmbH<br />
China<br />
<strong>TROX</strong> Air Conditioning<br />
Components(Suzhou) Co., Ltd.<br />
Dänemark<br />
<strong>TROX</strong> Danmark A/S<br />
Deutschland<br />
FSL GmbH & Co. KG<strong>TROX</strong> Deutschland<br />
GmbH<br />
Frankreich<br />
<strong>TROX</strong> France Sarl<br />
Foreign representations<br />
Abu Dhabi<br />
Ägypten<br />
Bosnien-Herzegowina<br />
Chile<br />
Finnland<br />
Griechenland<br />
Indonesien<br />
Iran<br />
Irland<br />
Island<br />
Israel<br />
Jordanien<br />
Korea<br />
Lettland<br />
Libanon<br />
Litauen<br />
Marokko<br />
Neuseeland<br />
Branch office / Romandy<br />
<strong>TROX</strong> <strong>HESCO</strong> <strong>Schweiz</strong> <strong>AG</strong><br />
Route des Arsenaux 37<br />
Case postale 257<br />
CH - 1705 Fribourg<br />
Telefon +41 (0)26 425 59 00<br />
Telefax +41 (0)26 425 59 01<br />
www.troxhesco.ch<br />
info@troxhesco.ch<br />
Großbritannien<br />
<strong>TROX</strong> UK Ltd.<br />
<strong>TROX</strong> AITCS Ltd.<br />
Hongkong<br />
<strong>TROX</strong> Hong Kong Ltd.<br />
<strong>TROX</strong> AITCS Ltd.<br />
Indien<br />
<strong>TROX</strong> INDIA PRIVATE LIMITED<br />
Italien<br />
<strong>TROX</strong> Italia S.p.A.<br />
Kroatien<br />
<strong>TROX</strong> Austria GmbH<br />
Malaysia<br />
<strong>TROX</strong> Malaysia Sdn. Bhd.<br />
Norwegen<br />
<strong>TROX</strong> Auranor Norge AS<br />
Österreich<br />
<strong>TROX</strong> Austria GmbH<br />
Polen<br />
<strong>TROX</strong> Austria GmbH<br />
Rumänien<br />
<strong>TROX</strong> Austria GmbH<br />
Niederlande<br />
Oman<br />
Pakistan<br />
Philippinen<br />
Portugal<br />
Saudi Arabien<br />
Schweden<br />
Simbabwe<br />
Slowakische Republik<br />
Representation / Italian-speaking<br />
Switzerland<br />
Bärtschi SA<br />
Centro Ingegneria Impiantistic<br />
Via Baragge 13 c<br />
CH - 6512 Giubiasco<br />
Telefon +41 (0)91 857 73 27<br />
Telefax +41 (0) 91 857 63 78<br />
www.troxhesco.ch<br />
info@troxhesco.ch<br />
Russland<br />
OOO <strong>TROX</strong> RUS<br />
Schweden<br />
<strong>TROX</strong> Sverige AB<br />
<strong>Schweiz</strong><br />
<strong>TROX</strong> <strong>HESCO</strong> <strong>Schweiz</strong> <strong>AG</strong><br />
Serbien<br />
<strong>TROX</strong> Austria GmbH<br />
Spanien<br />
<strong>TROX</strong> España, S.A.<br />
Südafrika<br />
<strong>TROX</strong> South Africa (Pty) Ltd<br />
Tschechische Republik<br />
<strong>TROX</strong> Austria GmbH<br />
Ungarn<br />
<strong>TROX</strong> Austria GmbH<br />
USA<br />
<strong>TROX</strong> USA, Inc.<br />
<strong>TROX</strong> AITCS Ltd.<br />
Vereinigte Arabische Emirate<br />
<strong>TROX</strong> Middle East (LLC)<br />
Slowenien<br />
Taiwan<br />
Thailand<br />
Türkei<br />
Ukraine<br />
Uruguay<br />
Venezuela<br />
Vietnam<br />
Zypern
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