The Impact of HVAC Systems on Speech Intelligibility in University Classrooms

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dc.authorid0000-0001-5983-3953
dc.contributor.authorOktav, Akin
dc.contributor.authorEner, Arda
dc.contributor.authorOzenc, Faruk
dc.contributor.authorSari, Sila
dc.date.accessioned2026-01-24T12:29:22Z
dc.date.available2026-01-24T12:29:22Z
dc.date.issued2025
dc.departmentAlanya Alaaddin Keykubat Üniversitesi
dc.description.abstractGood speech intelligibility in university classrooms is crucial to the learning process, ensuring that students can clearly hear all conversations taking place in the classroom. While it is well known that speech intelligibility depends on the geometrical characteristics of a space and the properties of its surfaces, other factors need also to be considered. Among the most important are: the heating, ventilation, and air conditioning (HVAC) systems used in classrooms. Fan noise from HVAC systems increases the background noise level (BNL), negatively affecting speech intelligibility. In addition, the movement of air caused by these systems alters room acoustic variables. Although this dynamic situation is often overlooked in the early design stages, HVAC systems are often active during lectures and influence acoustics variables, especially the speech transmission index (STI). In this study, the impact of HVAC systems on the STI was measured in five different unoccupied classrooms in the Rafet Kay & imath;,s Faculty of Engineering at Alanya Alaaddin Keykubat University. The results were evaluated according to relevant standards. The results of these evaluations offer insights for researchers, architects, and engineers working in the field of acoustics.
dc.description.sponsorshipScientific and Technological Research Council of Turkiye (TUBITAK) [123M884]; TUBITAK
dc.description.sponsorshipThis study was supported by the Scientific and Technological Research Council of Turkiye (TUBITAK) under grant no. 123M884. The authors thank TUBITAK for their support.
dc.identifier.doi10.24425/aoa.2025.153661
dc.identifier.endpage263
dc.identifier.issn0137-5075
dc.identifier.issn2300-262X
dc.identifier.issue2
dc.identifier.scopus2-s2.0-105009323913
dc.identifier.scopusqualityQ3
dc.identifier.startpage253
dc.identifier.urihttps://doi.org/10.24425/aoa.2025.153661
dc.identifier.urihttps://hdl.handle.net/20.500.12868/5320
dc.identifier.volume50
dc.identifier.wosWOS:001530252500010
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherPolska Akad Nauk, Polish Acad Sciences, Inst Fundamental Tech Res Pas
dc.relation.ispartofArchives of Acoustics
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20260121
dc.subjectspeech intelligibility
dc.subjectspeech transmission index (STI)
dc.subjectroom acoustic variables
dc.subjectroom impulse response (RIR)
dc.subjectacoustic performance
dc.titleThe Impact of HVAC Systems on Speech Intelligibility in University Classrooms
dc.typeArticle

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