naturally intelligent buildings ACOUSTIC DATA FOR VENTIVE WINDHIVE CARRIED OUT BY SRL SOUND LABORATORIES

Ventive Ltd Thames House Swan Street Isleworth TW7 6RS United Kingdom Email: [email protected] Website: www.ventive.co.uk Test carried out by: Sound Research Laboratories Holbrook House Little Waldingfield Sudbury Suffolk CO10 0TF United Kingdom Ventive Windhive was tested in various configurations. The sample was mounted/located and tested in accordance with the relevant standard. The method and procedure are described in Appendix A. The measurement uncertainty is given in Appendix B.

EXTERNAL DIFFUSER HEAT EXCHANGER WINDHIVE COWL REVERBERATION ROOM REVERBERATION ROOM

In the laboratory, airborne sound transmission is determined from the difference in sound pressure levels measured across a test sample installed between two reverberant rooms. The difference in measured sound pressure levels is corrected for the amount of absorption in the receiving room. The test is done under conditions which restrict the transmission of sound by paths other than directly through the sample. The source sound field is randomly incident on the sample. The test sample is located and sealed in an aperture within the brick dividing wall between the two rectangular reverberant (i.e....

laboratory, because only under such controlled conditions can the sound transmission path be limited to the sample under test. Rw, C and Ctr have been calculated in accordance with the relevant section of BS EN ISO 717-1:2013 from the results of laboratory tests carried out in accordance with BS EN ISO 101402:2010. The following values of uncertainty are based on a standard uncertainty multiplied by a coverage factor of k = 2 , which provides a level of confidence of approximately 95%.

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