Key points are not available for this paper at this time.
We were faced with the need to develop a noise analysis for replacement rooftop units at a university academic building. With uncertainty about the accuracy of as-built documentation for some of the distribution ductwork and existing duct silencer performance, there was concern that a traditional hand calculation of sound levels from the new rooftop air handling units may not be a reliable method of evaluation. We developed a test method to document in-situ sound power levels from the existing units and resulting sound pressure levels in interior spaces using a reference sound source. These data were then used to predict interior sound pressure levels from the new units. This paper presents the test method, results, and lessons learned.
A. Keith Jenkins (Sun,) studied this question.