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Open-plan office (OPO) is one of the key design elements in green office buildings. It relates closely to the successful implementation of other green building design elements such as daylight harvesting, natural ventilation system, and minimization of finishes. However, while open-plan office assists in the betterment of air quality, thermal comfort, and visual comfort; it actually marginalized the fourth element of indoor environmental quality (IEQ) that is, acoustic comfort. Nevertheless, properly designed OPO’s elements could assist in the improvement of acoustic condition in open-plan offices. Hence, using computer simulation tool, the objective of the paper is to compare the effect of different OPO’s elements such as the workstation layout arrangement (WLA), partition height, and partition type (in absorption coefficient); towards the speech privacy and intelligibility of two existing OPOs with two different shapes (square and elongated shape). Four relevant acoustic quantities namely speech transmission index (STI), distraction distance (rD), spatial decay rate of speech (D2,S), and A-weighted SPL of speech at a distance of 4m (Lp,A,S,4 m) are analysed to recognize the level of speech privacy and intelligibility in the OPOs. Initial findings show that modifications in partition type influence significantly in the speech privacy and intelligibility of the offices. Meanwhile, differences in partition heights consistently influence the D2,S and Lp,A,S,4 m with higher partition resulted in the increase of D2,S and the decrease of Lp,A,S,4 m and rD accordingly. As for WLA, the mechanics of linear and cluster arrangements work differently for both square and elongated office shape.
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