Preprint Article Version 1 This version is not peer-reviewed

Effects of Ventilation Improvement on Measured and Perceived Indoor Air Quality in a School Building with a Hybrid Ventilation System

Version 1 : Received: 28 February 2018 / Approved: 1 March 2018 / Online: 1 March 2018 (12:19:08 CET)

How to cite: Vornanen-Winqvist, C.; Järvi, K.; Andersson, M.A.; Ahmed, K.; Toomla, S.; Mikkola, R.; Marik, T.; Kredics, L.; Salonen, H.; Kurnitski, J. Effects of Ventilation Improvement on Measured and Perceived Indoor Air Quality in a School Building with a Hybrid Ventilation System. Preprints 2018, 2018030007 (doi: 10.20944/preprints201803.0007.v1). Vornanen-Winqvist, C.; Järvi, K.; Andersson, M.A.; Ahmed, K.; Toomla, S.; Mikkola, R.; Marik, T.; Kredics, L.; Salonen, H.; Kurnitski, J. Effects of Ventilation Improvement on Measured and Perceived Indoor Air Quality in a School Building with a Hybrid Ventilation System. Preprints 2018, 2018030007 (doi: 10.20944/preprints201803.0007.v1).

Abstract

This paper describes a case study of ventilation as well as measured and perceived indoor air quality (IAQ) in a Finnish comprehensive school with a hybrid ventilation system and reported IAQ problems. An operational error was found when investigating the ventilation system that prevented air from coming into classrooms, except for short periods of high carbon dioxide (CO2) concentrations. However, results indicated that hybrid ventilation system was able to provide adequate ventilation and sufficient IAQ once properly designed and maintained. After ventilation operation was improved, occupants reported less unpleasant odors and stuffy air. The amount of total volatile organic compounds (TVOC) and some single volatile organic compounds (VOCs) decreased. Indoor mycobiota was observed in settled dust in the classrooms, from which ventilation improvement eliminated the dominant, opportunistic human pathogen species Trichoderma citrinoviride found before improvement.

Subject Areas

ventilation; hybrid ventilation; indoor air quality; mycobiota; indoor air questionnaire; school building; Trichoderma citrinoviride

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