We are currently working on a project wich the HVAC system selected was the split highwall, and there are 3 evaporation machines inside each classroom. The measurement taken inside the classroom has demonstrated a 47dBA level, which do not satisfy the pre-requisite requirements. However, we could not find available on Brazilian market equipments which could satisfy this noise limitation.
Is it possible to attend credit requirements by an alternative compliance path just stating that we could not find better equipments? If not, is it possible to reduce these 47dBa by installing sound absorptive panels inside the room?
Thank you for your time in advance!
Regards
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Daniel Hicks
Daniel Hicks, E.I., INCEGeiler & Associates
267 thumbs up
May 23, 2011 - 1:10 pm
Unfortunately, placing acoustic panels in the room probably won't reduce the noise levels from the mechanical equipment to any significant degree if the spaces are already meeting the reverberation time requirements. If it were a highly reverberant room, it might be a little different, but it probably won't do anything for you in this case.
One option that might work would be to hang panels around the unit, making it semi-enclosed. You would need to work with the mechanical engineer to make sure that this wouldn't cause a problem for air flow or heating/cooling, however.
Also, I would try to work with the mechanical contractor or the manufacturer to see what can be done to reduce the noise levels of the installed evaporators. Maybe retrofitting spring or rubber isolators on the fans or reducing the speed that they operate at.
Lastly, I would also make sure that the noise levels were measured correctly. You're only 2 dB(A) off from the requirement. So close! Subjectively, this small of a difference would probably not be noticeable but LEED will probably stick to the 45 dB(A) requirement.
Good luck!
Marcio Alberto Casado Pereira
181 thumbs up
May 30, 2011 - 10:16 am
Daniel,
Thank you for your answer and solutions. Our team will have to evaluate deeply this case!