9
Special topics
9.4
Cinemas
TECHNICAL NOTE
Control of reverberation
To address the reverberation and echoes within the cinema itself, it should be understood that the design
of the sides of the house in a concert hall is rather different from the design in a cinema. Pronounced initial
reflections from any direction should be eliminated in a cinema.
As indicative information, recommended mean
s in relation to room volumes are listed below
1
:
Room volume (m
3
)
Recommended mid-frequency reverberation time (s)
100
0.25
1000
0.4
10000
0.7
Read more at:
List of acoustics companies
Hong Kong Institute of Acoustics. (2011). List of acoustics companies. Retrieve 6 June 2013, from
1
Standards Association of Australia (1987). Acoustics: Recommended design sound levels and reverberation times for
building interiors. North Sydney, N.S.W.: The Association.
9.4.3 Scheduling of movie show-times to avoid congestion
It is not uncommon to have very long queues at the ladies room before or after a movie. The problem can be mitigated,
at least partially, by proper scheduling of movie show-times to avoid simultaneous commencement or ending of movies at
different cinemas within the same complex.
9.4.4 Energy efficiency
• Use of energy efficient lighting
• LED exit signs
• Apply natural lighting wherever possible
• Consider demand control ventilation (DCV)
• Optimise the indoor temperature
• Maintain good insulation for the ventilation system, and apply wall or door sealers if needed
• Encourage audiences to bring their own 3D glasses or for the cinema to provide “reusable” 3D glasses
GREEN TIPS
Reset of temperature
We would suggest having temperature reset of the supply air temperature:
When the audience is settled down and is seated for a while, e.g. Increase the space temperature by
1 – 2°C after 15 – 20 minutes start of the show/film.
9.4.5 Professional help
It is important to engage professionals for detailed consultation on the implementation of green measures in cinemas.
The following is a list of references for obtaining professional help:
• Authorised persons (AP) – Appendix A (2)
• Acoustic consultants – Appendix A (8)
• Registered professional engineers (RPE) in the building services discipline – Appendix A (4)
•
Appendix A (7)
Hong Kong Green Building Council 193
