| 1. |
- Cabovska, Blanka, 1990, et al.
(författare)
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Ventilation strategies and indoor air quality in Swedish primary school classrooms
- 2022
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Ingår i: Building and Environment. - Göteborg : IVL Svenska Miljöinstitutet AB. - 0360-1323 .- 1873-684X. ; 226, s. 109744-109744
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Tidskriftsartikel (refereegranskat)abstract
- The present study aimed at investigating the effects of ventilation strategies on indoor air quality (IAQ) in schools. Measurements of thermal environment and IAQ were performed over 5 school days in 45 primary school classrooms in Gothenburg, Sweden, grouped into three categories according to their ventilation system: category A) natural or exhaust ventilation, or automated window opening; category B) balanced mechanical ventilationsystems with constant air volume (CAV) and category C) balanced mechanical ventilation systems with variable air volume (VAV). The classrooms performed equally well with respect to temperature and relative humidity regardless of the ventilation system. The concentrations of the air pollutants in all classrooms were generally below the respective guideline values. The concentrations of CO2, formaldehyde, PM10, and PM2.5 were lower in the B and C category classrooms with higher ventilation rates than in the A category classrooms. Indoor Air Pollution Index integrating concentrations of multiple pollutants was significantly higher the A category classrooms, reflecting poorer IAQ. Majority of the classrooms had lower ventilation rates than the Swedish ventilation requirements. The periodically reduced ventilation rates in the classrooms with VAV systems did not lead to substantial increase in the measured indoor pollutant concentrations.
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| 2. |
- Dalenbäck, Jan-Olof, 1954, et al.
(författare)
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Låg luftfuktighet i svenska bostäder – ett problem?
- 2021
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Ingår i: Energi & miljö. ; 10
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Låg relativ luftfuktighet inomhus är ett problem i många svenska bostäder under uppvärmningssäsongen, mera i lägenheter än i småhus, i hus byggda efter 1985 och i de norra delarna av landet. Ventilation av nya bostäder blir en allt viktigare faktor med avseende på luftfuktigheten inomhus.
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| 3. |
- Langer, Sarka, 1960, et al.
(författare)
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I-CUB: 'Indoor Climate-Users-Buildings': Relationship between measured and perceived indoor air quality in dwellings
- 2021
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Ingår i: Journal of Physics: Conference Series. - : IOP Publishing. - 1742-6588 .- 1742-6596. ; 2069:1
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Konferensbidrag (refereegranskat)abstract
- Assessment of indoor environmental quality has recently moved to a combined methodology of both measurements and questionnaire surveys. In this study, we have used data from the national survey of the Swedish housing stock, BETSI, conducted in 2007/2008, during the heating season. The study included, among others, measurement of selected indoor air pollutants and an extensive questionnaire survey on the occupants' perception of their dwellings. Measured concentrations of the air pollutants NO2, TVOCs and formaldehyde were aggregated into one Indoor Air Pollution Index (IAPI) on a continuous scale between 0 (excellent Indoor Air Quality; IAQ) and 10 (poor IAQ). The perceived IAQ was assessed by the occupants on a 5-point category scale from very good to very poor. On the entire scale of IAPIs, 92% of the respondents in single-family houses perceived the IAQ as very good or good and 8% as acceptable, while in the apartments, the ratings 'very good' and 'good' accounted for 58%, acceptable for 33% and 9 % for 'poor' and 'very poor', respectively. In both building types, the tendency of IAPIs was shifted to lower values (good IAQ). Analysis of IAPI-medians showed no statistically significant differences between and among the air quality perception ratings.
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| 4. |
- Psomas, Theofanis, 1983, et al.
(författare)
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Association of Perceived Thermal Comfort and Air Quality with Building- and Occupant-Related Characteristics and Environmental Parameters in Sweden
- 2024
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Ingår i: Energies. - 1996-1073 .- 1996-1073. ; 17:6
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Tidskriftsartikel (refereegranskat)abstract
- The aim of the article is to analyze the perceived thermal comfort and indoor air quality of occupants and establish associations between these responses and the building-related, occupant-related characteristics, and environmental parameters of residential buildings (a total of 38 variables). The analysis is focused on the Swedish building stock as investigated during the latest national survey in 2008. The analysis covers 1035 residential buildings (multifamily and single-family dwellings). Analytical statistical analysis has been conducted, and logistic regression models have also been developed for the identification of statistically significant covariates. The analysis showed that users in this study demonstrated a significantly positive response to perceived thermal comfort and indoor air quality conditions. Perceived ratings were also highly correlated with each other. As the regression models indicated, the majority of the significant variables were related to the buildings. Nevertheless, this study also underscores the significance of contextual occupant attributes and behaviors as a crucial element influencing the subjective perception of indoor environments. Policymakers, guided by these insights, are encouraged to integrate considerations of occupant attributes into design and urban planning.
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| 5. |
- Psomas, Theofanis, 1983, et al.
(författare)
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Does Gender Matter in Perception of Indoor Environmental Quality? Findings From A Swedish National Survey
- 2022
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Ingår i: Proceedings of Indoor Air 2022.
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Konferensbidrag (refereegranskat)abstract
- Individuals perceive indoor spaces differently, and their requirements are subjectively defined. An analysis of the latest national survey of the stock in Sweden is conducted to describe particular aspects of indoor space in relation to gender. The objective of this study is to provide additional evidence to the existing body of knowledge concerning the existence and potential significance of gender differences on indoor environmental quality factors and overall satisfaction. The analysis is conducted in 80 apartments and 296 single-family buildings, both of which are occupied by males and females. The analysis makes use of 5 indoor environmental quality factors, which are quantified using a five-point ordinal scale. For both genders and all factors and variables evaluated, descriptive and advanced statistical analysis is performed. Different confounding variables were also investigated. The findings indicate that different genders evaluate spaces equally in the majority of cases. Additionally, an adaptation mechanism is highlighted.
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| 6. |
- Psomas, Theofanis, 1983, et al.
(författare)
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Does Gender Matters in Perception of Indoor Environmental Quality? Findings From A Swedish National Survey
- 2022
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Ingår i: 17th International Conference on Indoor Air Quality and Climate, INDOOR AIR 2022.
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Konferensbidrag (refereegranskat)abstract
- Individuals perceive indoor spaces differently, and their requirements are subjectively defined. An analysis of the latest national survey of the stock in Sweden was conducted to describe particular aspects of perception of different parameters of indoor space in relation to gender. The objective of this study was to provide additional inputs to the existing body of knowledge concerning the existence or not and potential significance of gender differences on the perception of four different indoor environmental quality factors and overall satisfaction (five-point ordinal scale). The analysis was conducted in 80 apartments and 295 single-family buildings, both of which were occupied by males and females. For both genders and all factors and confounding variables evaluated, descriptive and advanced statistical analysis was performed. The findings indicate that different genders evaluate spaces equally in the majority of cases.
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| 7. |
- Psomas, Theofanis, 1983, et al.
(författare)
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Indoor humidity of dwellings and association with building characteristics, behaviors and health in a northern climate
- 2021
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Ingår i: Building and Environment. - : Elsevier BV. - 0360-1323 .- 1873-684X. ; 198
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Tidskriftsartikel (refereegranskat)abstract
- Data from a nationwide survey on the status of the Swedish residential building stock and indoor air quality was placed in the public domain by the National Board of Housing, Building and Planning of Sweden. The current research investigates the indoor humidity conditions in Swedish residential buildings, single-family houses and apartments, assessing the measurements from the extensive BETSI-survey against adjusted relative humidity levels based on existing norms and Standards. The aim of this study is to investigate associations and correlations between relative humidity levels and multiple building and system characteristics, occupancy patterns and behaviors and health symptoms-complaints. The analysis uses 13 categorical and 9 continuous variables-parameters of the examined dwellings. Analysis shows that low indoor relative humidity is a realistic issue in Swedish dwellings during the heating season. The issue is more prevalent in apartments than single-family houses. In addition, low indoor relative humidity seems to be more extensive in dwellings with higher indoor temperature, smaller volume, higher ventilation rate and frequent airing practices, lower number of occupants, constructed mainly after 1985, in city suburbs and in the northern parts of the country. The developed multinomial logistic regression model may predict very accurately the relative humidity level of the Swedish dwellings, during heating season. This analysis offers additional evidence to the scientific literature for possible correlation of low relative humidity with specific health symptoms, complaints and disturbances.
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| 8. |
- Psomas, Theofanis, 1983, et al.
(författare)
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Indoor humidity of dwellings in a northern climate
- 2021
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Ingår i: REHVA Journal. ; 06/2021, s. 37-40
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Low indoor relative humidity has been shown to be an issue in Swedish dwellings and mostly apartments, during the heating season. Present analysis adds to the scientific literature by demonstrating a possible association between low relative humidity and particular health symptoms and complaints.
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| 9. |
- Psomas, Theofanis, 1983, et al.
(författare)
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Influence of indoor environmental quality and dwelling satisfaction aspects on overall satisfaction: Findings from a Swedish national survey
- 2023
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Ingår i: E3S Web of Conferences. - 2555-0403 .- 2267-1242. ; 396
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Konferensbidrag (refereegranskat)abstract
- The objective of this study is to contribute to the discussion on the impact of dwelling satisfaction aspects (size, standard, layout, appearance/aesthetics, well-being, cost and area/neighbourhood) and perceived indoor environmental quality (thermal comfort, air quality, satisfaction with daylight and acoustic comfort) on occupants' overall satisfaction. This article uses data from the Swedish National Survey, BETSI (2007/08). The results are representative of adults living in multi-family and single-family buildings (1597 responses/955 buildings). Linear regression models are developed with overall satisfaction as the dependent variable and independent variables: seven satisfaction aspects, four indoor environmental quality factors and all combined (eleven). An all-model explained 54.7% of the results (best performed). All the retained variables (except satisfaction with daylight) are statistically significant predictors. Satisfaction with well-being (b = 0.286) and satisfaction with dwellings' standard (b = 0.188) have the greatest effect on overall satisfaction. The model with the IEQ aspects explained only 35.5% of the results. Reliability statistics (Cronbach's alpha) and confirmatory factor analysis have been implemented in the dataset. The responses can be categorized into two clusters. The two clusters were significantly different across living duration, dwelling type, age category and tenure status.
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| 10. |
- Psomas, Theofanis, 1983, et al.
(författare)
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Low Relative Humidity, a Problem or Not in Swedish Dwellings?
- 2021
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Ingår i: INDOOR ENVIRONMENTAL QUALITY PERFORMANCE APPROACHES (IAQ 2020), PT 1. - 9781955516013
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Konferensbidrag (refereegranskat)abstract
- The current research investigates the relative humidity conditions in Swedish dwellings (678 apartments and single-family houses), comparing measurements from the 2007/2008 BETSI-survey (heating season), with the recommendations of the EN 16798:2019. Analysis shows that 61.4% of the apartments and 29.8% of the single-family houses belong to Cats. 3 and 4, which correspond to moderate and low level of expectation, respectively (mainly due to low relative humidity). The problem is bigger for dwellings with smaller volume, higher ventilation rate and indoor temperature, constructed mainly after 1985.
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