We are trying to calculate reverberation time in a classroom which has a daylight monitor in the ceiling. The monitor takes up about 30% the total area of the room Can we regard the "hole" in the ceiling as "air" for calculation purposes, since it does absorb some of the sound?
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Daniel Hicks
Daniel Hicks, E.I., INCEGeiler & Associates
267 thumbs up
September 14, 2010 - 5:54 pm
Hi Caroline:
No, I wouldn't add absorption for air in your calculations. I would include the interior surface materials of the monitor (I'm assuming glass and some amount of hard surfaces like gypsum or wood) and make sure to add the additional volume of the monitor space to the total volume of the classroom for the calculation.
Caroline Kilbane
Project ManagerLesko Associates
19 thumbs up
September 15, 2010 - 7:58 am
Ok - Am I right in saying that there is no way to enter the data on the form online, and that I will have to do my own spreadsheet for the calculations and submit this through the "alternative compliance path"? This is because the online form does not make provision for entering the dimensions of an irregularly shaped volume. Also, If I do submit a spreadsheet, will the reviewer want the actual spreadsheet (to view the formulas) or will a pdf suffice?
Daniel Hicks
Daniel Hicks, E.I., INCEGeiler & Associates
267 thumbs up
September 15, 2010 - 9:49 am
Yes, you are correct. You will have to do your own calculations. I would submit a narrative along with an actual spreadsheet in case they had any questions about the formulas you were using.