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- 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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- 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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- Åhs, Magnus
(författare)
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Remote monitoring and logging of relative humidity in concrete
- 2005
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Ingår i: Proceedings of the 7th symposium on building physics in the Nordic countries. - 9979917466 ; , s. 181-187
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Konferensbidrag (refereegranskat)abstract
- It is important to measure the relative humidity, RH, level in a concrete slab before applying semi permeable flooring to the surface. If the moisture level in the concrete is too high when the flooring is applied the high alkali level in combination with the moisture will degrade the adhesive. This paper describes a new system used to continuously measure and monitor RH in situ during the construction stage. The paper includes descriptions of the method, an authentic measurement, and also how to evaluate results given by the measuring equipment. The presented results are taken from measurements performed on a construction site where the RH has been monitored, via the mobile phone network.
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