Acoustics and Classrooms BARD MANUFACTURING COMPANY REGISTERED AIA PRESENTER VAUGHAN SMITH
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1 Acoustics and Classrooms BARD MANUFACTURING COMPANY REGISTERED AIA PRESENTER VAUGHAN SMITH
2 Acoustics and Classrooms SOURCES OF NOISE ACOUSTICAL TERMS AND DEFINITIONS ANSI STANDARD OCCUPIED AND UNOCCUPIED CLASSROOMS HVAC AND SOUND IN CLASSROOMS
3 Acoustics and Classrooms LEARNING OBJECTIVES: SOURCES ON NOISE AFFECTING CLASSROOM LEARNING ACOUSTICAL TERMS AND DEFINITIONS DESIGN RECOMMENDATIONS MEASUREMENT OF SOUND IN CLASSROOMS ACOUSTICAL STANDARDS
4 Background noise
5 Noise in the classroom Outside: Vehicles, Voices (highway, playground) Inside: Students Equipment: computers, projections, mini refrigerator? Reverberation Neighboring classrooms and hallways Lighting HVAC
6 Acoustical Terms Noise: unwanted sound Sound Power Sound Pressure Reverberation NC: Noise Criteria db dba
7 Sound Power vs. Sound Pressure Sound Pressure is dependent on the acoustical environment. The factors involved include: Effects of near by reflecting surfaces Receiver distance Type of space Amount and location of absorption in the space The location in the space The presence of barriers in the space Intrusion of ambient sounds Carrier gud
8 Sound Power vs. Sound Pressure Sound Power is a measure of total energy per unit time emitted by the source in all directions Typical HVAC manufacturer provides equipment sound power data in db per octave band Carrier gud
9 Sound Power vs. Sound Pressure dba Carrier gud
10 Sound Power vs. Sound Pressure Sound Power: 100 watt light bulb, relative power rating Noise Criteria Sound Pressure: Lumens or brightness at any location in room is similar to Pressure decibel dba Typical HVAC manufacturer provides equipment sound power data in db per octave band
11 Noise Criteria (NC) A one-number measure of background noise, created by measuring the sound pressure at the loudest points in the environment
12 Decibel (db) A unit of measure of the loudness of a sound. Louder sounds have a larger decibel value. A weighting (dba): a measure of sound pressure level designed to reflect the response of the human ear, which is less sensitive to low and high frequencies
13 dba levels for various noises
14 Key Terms Reverberation:
15 Want early reflections No echoes FACTORS Size of room Shape of room Surfaces Good Sound Treatments Acoustical ceiling tile Sound absorbing walls Soft space elements Carpet Early reflection of teacher s voice
16 Background noise in classrooms Signal to noise ratio (SNR) difference in dba between the speech (signal) and noise (background) Recommended: 15 dba difference, Teacher s voice: 60 dba Background noise should be 45 dba or less
17 STC Wikipedia: Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. In the USA, it is widely used to rate interior partitions, ceilings/floors, doors, windows and exterior wall configurations (see ASTM International Classification E413 and E90).
18
19 The Unoccupied Classroom
20 ANSI S unoccupied classrooms Classrooms less than 10,000 cu ft 35 dba background noise.6 sec. reverberation time STC 50 (for construction)
21 Why 35 dba background noise? Signal to noise ratio 15 dba Teachers voice at 50 dba can be heard clearly with background of 35 dba Human voice dba
22 Teacher voice: dba with proper room acoustics SNR Signal to noise ratio? dba 40-47
23 35 dba background noise Acoustical analysis of site Acoustically isolated from hallway, adjacent rooms considerable upgrade of building and grounds design Acoustical Engineer likely required
24
25 Noise in occupied classrooms!!
26 So: how loud is it?
27 Studies of Occupied classrooms Multiple studies indicate occupied sounds levels during quiet periods average 48 dba or more Noise levels during general activities frequently exceeded 60 dba
28 LAUSD site analysis
29
30 LEED Schools:
31 Why is HVAC singled out for noise?
32 Systems can be designed for reduced noise in classrooms
33 AHU located in hallway ceiling Trane EDU-SLB026-EN June 01, 2011
34 Roof mounted equipment
35 Vertical unit: LEED installation
36 HVAC manufacturers have information!
37 HVAC Sound Test Lab
38 Summary: students learn in occupied classrooms
39 Some acoustic recommendations concerning HVAC Reverberation is determined by the room design and acoustics Soft rooms reduce background noise Supply and return ductwork properly designed (may not be required) Isolate equipment noise inside and outside the classroom
40 Questions or Comments?
41
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