Uncertainty of sound power measurements of a reference sound source using the AHRI Standard 230 sound intensity method
Time: 11:20 am
Author: Curtis Eichelberger
Abstract ID: 1612
The uncertainty of determining the sound power of HVAC equipment using the AHRI Standard 230 sound intensity measurement method is presented. Measurements of six different reference sound sources (RSS) at four different laboratories, by nineteen different individuals with four different instrumentation systems are presented. From 2004 through 2020, these measurements were performed as part of a training program at Johnson Controls HVAC test laboratories to qualify technicians and engineers on the use of sound intensity instrumentation. The results illustrate the reproducibility of sound intensity measurements using the scanning method of AHRI Standard 230.
Modeling ISO 156656 Large Diameter Industrial Pipe Insulation
Time: 8:00 pm
Author: Kevin Herreman
Abstract ID: 1870
As previously presented, reducing industrial noise emission utilizing jacketed pipe insulation is critical to reducing noise in industrial spaces. The ISO 15665 standard defines a testing process for measurement of the acoustical performance of installed and jacketed pipe insulation systems. To provide a cost-effective method for evaluating various types of multilayered jacketed pipe insulation a model was developed. The model accurately estimates the performance of single, and multilayered, jacketed pipe insulation. Validating the use of the model to very large pipe diameters is highly desirable as the cost to test is significantly higher than testing the medium or small diameter pipe insulation. The estimated insertion loss result from the model is compared to validation testing results for large diameter jacketed pipe insulation are reported herein.
Proacustica Handbook: noise and vibration control in building installations
Time: 11:00 am
Author: Jose Nepomuceno
Abstract ID: 2948
Proacústica is a nonprofit entity created in 2010 to congregate companies and professionals willing to leverage the development of acoustics in Brazil. Three technical committees (TCs): Environmental Acoustics, Building Acoustics, and Room Acoustics, contribute to the drafting of laws, standards, production of technical content, and integration between different players of the market. By 2021, the Room Acoustics TC incorporated three Working Groups: Special Rooms, Schools and Noise Control and Vibration Control the last one dedicated to the Proacustica Handbook: Noise and Vibration Control In Building Installations. The purpose of this publication is to describe the step-by-step measures to implement noise and vibration control strategies in buildings. These strategies are aimed at the particularities of the Brazilian market at the moment and also a way to improve how M/E/P equipment manufacturers, installers, designers, and acoustic consultants approach the subject from the design to the construction, Important technical discussions among participants included: the use of sound pressure versus sound power data for equipment; the sound rating for diffusers, VAVs, and other ductwork devices; vibration isolation guidelines, among other topics. This paper presents the Handbook structure, relevant discussions, and recommendations to be published as a final document by the end of 2021.
Post-occupancy HVAC survey: What can be learned from 1,800 measurements
Time: 11:40 am
Author: Jeff Fullerton
Abstract ID: 2958
After opening a new multi-family residential complex, the association was asked to perform a comprehensive survey of the sound from their HVAC systems. The survey sought to quantify the sound levels from every HVAC diffuser, grille, and register that served the residences and common spaces. The effort required access into over 250 residences typically measuring between 3 and 5 locations in each residence, and as many as 7 to 9 locations in penthouse residences. While the heat pump systems serving the residences were similar models, their capacities varied depending on the square footage and solar exposure of the residence. The variations in the sound levels of these systems and from the central ventilation were significant. This presentation will highlight what was learned from the survey.