“No building acoustics conference would be complete without a presentation from Jack Harvie-Clark of Apex Acoustics” says the Institute of Acoustics’ Bulletin magazine, reporting on the 2016 IOA annual conference at Chesford Grange. Jack opened the conference with a presentation on practical issues with designing and testing to Building Bulletin 93: 2015.
The first half of the presentation concerned the design of mechanical ventilation systems. This included a review of the performance standards and their detailed application for different operating scenarios, and the need or otherwise for a bulkhead to enclose a mechanical ventilation unit. The second half of the presentation addressed the issue of calculating reverberation times, and reviewing the scatter in the data for many rooms that are designed along the same principles. The use of the Sabine formula may give results that appear to be accurate because the data for some elements could be mis-represented. A new approach looks at the sensitivity of the modelled results to the scattering coefficients used for the walls. It is shown that the range of results could correlate well with modelled values given the natural variation in scattering of the walls.
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