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ISO 3382-3 FOR SUSTAINABLE OPEN-PLAN OFFICES
ANC Annual Conference – 29th June 2016
Anthony Chilton
OVERVIEW
Sustainable open-plan office
Case Study
3382-3 Measurements
Post occupancy evaluation
Design approach
SUSTAINABLE OPEN-PLAN OFFICE
Bourne Hill Offices, Salisbury
Conventional Sustainable
Mechanically ventilated Naturally ventilated
Mechanically cooled Passively cooled (concrete soffits)
Low ceilings, high screens High ceilings, low screens
CASE STUDY - KEYNSHAM
CASE STUDY - KEYNSHAM
CASE STUDY - KEYNSHAM
KEYNSHAM – EXTERNAL NOISE
KEYNSHAM – EXTERNAL NOISE
Hard to provide masking noise without disturbance.
50
55
60
65
70
75
80
0 6 12 18 24 30 36 42 48 54 60 66 72 78 84
LAe
q,1
0s
[dB
]
15 minutes of traffic noise (10 second LAeq values)
LAFmax = LAF90 + 17dB
KEYNSHAM – NATURAL VENTILATION
Vent Area approx. 5% of floor area (or 10% of façade area)
KEYNSHAM – ACOUSTIC LOUVRES
0
10
20
30
40
50
60
70
80
63 125 250 500 1000 2000 4000 8000
Sou
nd
Lev
el [
dB
]
Octave Band Frequency [Hz]
Measured unoccupied LAF90
NR30
NR35
NR40
MEASURED INDOOR NOISE LEVEL
LA90 = 40dB
All vents fully open
KEYNSHAM - ABSORPTION
50% of the ceiling area is exposed concrete to provide passive cooling.
The other 50% is perforated aw=0.7 (Class C)
Absorbent outer surfaces to balustrades. Slatted timber.
Absorbent desk dividers.
REVERBERATION CONTROL
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
63 125 250 500 1000 2000 4000 8000
T20
[s]
Octave Band Frequency [Hz]
Reverberation Time, T20(average of 18 interrupted source measurements)
250Hz – 2kHz average = 0.75s
KEYNSHAM - SCREENING
Minimal screening – only desk dividers.
1100mm high (from floor).
Do not block direct sound.
KEYNSHAM – SUMMARY
Low masking noise.
Low absorption.
Low screening.
What is the significance for privacy?
3382-3 MEASUREMENTS
rD (Distraction Distance)
LwA=68.4dB
SPEECH INTELLIGIBILITY
STI
Distance [m]
SPEECH INTELLIGIBILITY
DISTRACTION DISTANCE
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0 2 4 6 8 10 12
STIP
A
Distance From Source [m]
rD=5.9m
CLASSIFICATION
Is Class B suitable for Keynsham?
Finnish Institute of Occupational Health
(Keränen, Hongisto, Virjonen)
Class rD
A <5m
B 5 - 8m
C 8 - 11m
D 11 - 15m
E > 15m
POST-OCCUPANCY EVALUATON
Total Performance of Low Carbon Buildings
8 office buildings in the UK, 16 in China.
4 POE acoustic questions.
Acoustic control parameters will be recorded.
CONTROL PARAMETERS
Occupancy
Activity Type (similar to NF 31-199)
Noise Levels
Ventilation Conditions
POE QUESTIONS
If you are dissatisfied with noise levels from colleagues in
your office, please indicate on the plan provided the area in
which the activity of colleagues can cause you disturbance
(see example below).
My Position
Area causingdisturbance
DESIGN APPROACH
http://www.ttl.fi/en/work_environment/physical_factors/acoustictool/Sivut/default.aspx
Screen Height 0% 20% 40% 60% 80% 100%
900mm
LAF90 = 34dB 1300mm
1700mm
Screen Height 0% 20% 40% 60% 80% 100%
900mm
LAF90 = 37dB 1300mm
1700mm
Screen Height 0% 20% 40% 60% 80% 100%
900mm
LAF90 = 40dB 1300mm
1700mm
Screen Height 0% 20% 40% 60% 80% 100%
900mm
LAF90 = 43dB 1300mm
1700mm
Average aw of Ceiling
Average aw of Ceiling
Average aw of Ceiling
Average aw of Ceiling
CLASSIFICATION MAPS
Acoustic Classification(Finnish Institute of Occupational Health)Keynsham
Preferred
CONCLUSIONS
Noise ingress - LAFmax 55dB
Electronic sound masking? – LAF90=43dB
Average aW of ceiling 0.5
Screen height 1350mm
Screens can be glazed above 1100mm.
Recommended