| 1. |
- Svennberg, Kaisa, et al.
(författare)
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Measurements of microclimates in beds in relation to the climatic requirements of house dust mites
- 2005
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Ingår i: [Host publication title missing]. - 9979917466
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Konferensbidrag (refereegranskat)abstract
- House dust mites are animals of a size less than 0.5 mm that can live in beds, carpets and furniture feeding on skin scales. They are a common source of allergy in, e.g., Scandinavia, where their major habitat is in beds. Previous studies show that in drier environments the house dust mite occurrence is lower, and persons with dust mite allergy have fewer symptoms during the winter when the indoor relative humidity (RH) is low. There have also been attempts to alter the microclimatic conditions in beds to reduce the house dust mite occurrence. The microclimatic conditions in beds have been studied both in field measurements and by modeling but there is still a lack of knowledge of how the hygrothermal material properties of the mattress and bedding affect the environmental conditions for the house dust mites. This paper presents diurnal temperature and RH variations in mattresses and beddings under normal use measured for two different mattress types. The climatic results from the beds have been compared to microclimatic requirements that govern the house dust mite activity levels. This study is a part of a multidisciplinary project aiming to find technical solutions for reduction of house dust mites in bedrooms by environmental control.
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| 2. |
- Svennberg, Kaisa, et al.
(författare)
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Moisture penetration in a chair seat as a response to daily RH variations in the indoor air
- 2005
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Ingår i: [Host publication title missing]. - 9979917466
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Konferensbidrag (refereegranskat)abstract
- In the indoor environment there are a number of materials with potential to act as moisture buffers including both building materials and furnishing materials. For daily moisture variations in the indoor air furniture with upholstery can play an important role as moisture buffers. Material properties and calculation models describing the response to moisture variations in the ambient climate for these material combinations are limited. In this project the moisture properties for a chair seat with a wool fabric and plastic foam padding were determined. The moisture penetration in the chair seat was measured using small temperature and relative humidity sensors. A numerical calculation model describing the step-response as well as the response to ramp variations is described. A comparison between measurements and theoretical calculations was performed. The difficulties with determination of material properties for highly permeable materials are also discussed as well as suitable methods and special considerations.
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| 3. |
- Svennberg, Kaisa, et al.
(författare)
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Previous experimental studies and field measurements on moisture buffering by indoor surface materials
- 2007
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Ingår i: Journal of Building Physics. - : SAGE Publications. - 1744-2583 .- 1744-2591. ; 30:3, s. 261-274
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Forskningsöversikt (refereegranskat)abstract
- An increased interest in moisture buffering in the indoor environment and the development of more refined hygrothermal calculation tools call for a better understanding of the phenomenon. There are many materials indoors with potential to act as moisture buffers, ranging from traditional finishing materials as gypsum plaster to textiles. The objective of this study is to show that the interest in moisture buffering is not a new issue. There have been significant laboratory studies made in the past. This study presents a review of such previous studies (1960-2000) on indoor surface materials from Germany and Sweden, not published in English before.
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| 4. |
- Svennberg, Kaisa, et al.
(författare)
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Sorption isotherms for textile fabrics, foams and batting used in the indoor environment
- 2008
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Ingår i: Journal of the Textile Institute. - : Informa UK Limited. - 1754-2340 .- 0040-5000. ; 99:2, s. 125-132
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Tidskriftsartikel (refereegranskat)abstract
- An increasing interest in the moisture buffering of indoor surface materials and new tools for calculation of energy demands and indoor climate calls for relevant material properties of all materials exposed to the indoor air. Textile fabric represents a large portion of the surface materials present in dwellings and offices and is therefore of special interest. This paper presents the sorption isotherms for nine fabrics, two foams and one batting, all of material compositions that are commonly found in the indoor environment. The data are fitted to the Hailwood-Horrobin sorption isotherm equation and good agreement is found for all materials. The difference in moisture capacity and hysteresis between different materials is discussed.
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