| 1. |
- Leiblein, T., et al.
(författare)
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Field study of natural, mechanical and hybrid ventilation systems of 27 office buildings in the temperate zone country switzerland
- 2014
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Ingår i: 13th International Conference on Indoor Air Quality and Climate, Indoor Air 2014; Hong Kong; Hong Kong; 7 July 2014 through 12 July 2014.
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Konferensbidrag (refereegranskat)abstract
- Analyses in this study focus on characteristics of three different clusters of ventilation for office buildings. These comprise natural, mechanical and hybrid ventilation. In a major project study, extensive data was collected from 27 office buildings. Besides physically measurable parameters, psycho-social-oriented surveys of building users and information about building-specific constructional or building technology were compiled. In a selection, results of indoor air quality (IAQ) and indoor environment quality (IEQ) were compared with current standards. Thom's Discomfort Index (DI) suggested that, for all three clusters, populations feeling discomfort are to be expected during the summer months. Responses for certain aspects corresponding to IEQ and IAQ showed a remarkable seasonal divergence of satisfaction with air temperature for naturally ventilated buildings. The appearance of stagnant air is found to occur in its strongest form in naturally and hybrid ventilated buildings. Mechanically ventilated buildings were reported as having the lowest values for satisfaction with air humidity in winter. Each ventilation system comprises characteristic advantages and disadvantages. A tendency might favour, at least seasonally, mechanically or hybrid ventilated buildings. Differences between these two systems are not significant in this sample. The result raises the question of how much technical effort is actually necessary to provide satisfactory ventilation.
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| 2. |
- Monn, C., et al.
(författare)
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Indoor air conditions in offices with different ventilation regimes - results from the QSB project (quality of sustainable buildings)
- 2015
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Ingår i: Gefahrstoffe Reinhaltung der Luft. - 0949-8036. ; 75:5, s. 191-196
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Tidskriftsartikel (refereegranskat)abstract
- During the research project "Quality of Sustainable Buildings" (English: QSB, German: QNB), 27 office buildings in Switzerland were investigated. Objective measurements (air quality CO2, air temperature, relative humidity) were performed and in addition, data on subjective judgements were collected using questionnaires. The analyses of this paper focus on the characteristics of ventilation (natural, mechanical and hybrid ventilation). Mechanically ventilated buildings indicated some advantages during the summer period with respect to the air temperature and in the winter with respect to the air quality (CO2). For naturally ventilated buildings, disadvantages during the winter were observed with respect to the air quality (CO2). The same buildings showed some advantage of a higher relative humidity in the winter period compared with the mechanically ventilated buildings. Subjective judgements did more or less correspond with the measured data. However, some parameters did not. Additional parameters for qualifying indoor air quality (here measured as CO2 concentration) need to be considered. In addition, the study showed a quite good quality (measured and judged) for most of the buildings. In order to contribute to energy savings and to achieve a better level of indoor air quality (e.g. humidity), indoor air temperature could be reduced in winter without negatively affecting the comfort requirements of the office users.
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