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- Bankvall, Claes, 1942, et al.
(författare)
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Air transport in and through the building envelope
- 2004
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Ingår i: Thermal Performance of the Exterior Envelopes of Whole Buildings. - 2166-8469.
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Konferensbidrag (refereegranskat)abstract
- A national R&D program dealing with air transport in and through the building envelope is presented, including some overviews of results. The program develops predictive models for evaluating air movements in and through the building envelope. These models are coupled to the outside climate and pressure situation and to the inside climate through the interaction with models defining the building services system. A major aim of the program is to analyze problems of relevance to the building process. This includes site inventory, modeling of typical situations, and laboratory testing for input data and to validate the models. The objective is to develop tools to help design and evaluate building elements and to give the necessary foundation for estimating the convective transport of heat and moisture in the envelope, which is decisive for the indoor climate, the consumption of energy, and the durability of the construction. The research program is ongoing and this presentation is to invite communication with others.
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| 2. |
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| 3. |
- Bankvall, Claes, 1942
(författare)
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Luftrörelser och täthet i byggnader
- 2014
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Ingår i: Bygg och teknik. - 0281-658X. ; 2014:5
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Frisk luft och hur den tas in och ut i våra byggnader är avgörande för en god innemiljö och för en väl fungerande byggnad. Att bygga för rätt luftrörelser är av största vikt. En rad skador (till exempel fukt och mögel) och olägenheter (till exempel energiförluster och drag) orsakas av bristande lufttäthet och oönskade luftrörelser
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| 4. |
- Bankvall, Claes, 1942
(författare)
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Luftrörelser på gott och ont
- 2014
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Ingår i: Samhällsbyggaren. - 2000-2408. ; 2014:2
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Dagens byggnad är ett system där klimatskalet, i form av väggar, tak och golv, samverkar med ventilationen och uppvärmningen. I en väl fungerande byggnad krävs kontroll på luftrörelserna. Att bygga som förr – men leva som i dag – är ingen säker lösning. Luftboken – Luftrörelser och täthet i byggnader beskriver på ett informativt och lättillgängligt sätt hur luftrörelser och täthet påverkar byggnadens beständighet, energieffektivitet och innemiljö.
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| 5. |
- Larsson, Bengt, 1943-, et al.
(författare)
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The Effect and Cost Impact of Poor Airtightness : Information for Developers and Clients
- 2007
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Ingår i: Thermal Performance of the Exterior Envelopes of Whole Buildings. - Orlando : ASHRAE. - 2166-8469. - 9781933742281
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Konferensbidrag (refereegranskat)abstract
- Air movements in and through the building envelope affect the flows of not only heat, but also moisture, gases and particles, in a building. They often play a decisive part in determining moisture conditions, and thus indoor environmental conditions in the building, and ultimately, the durability of the building structure. Air flows affect thermal comfort and ventilation, and thus air quality. In addition, they also cause heat loss, both directly via ventilation, and through their effect on the performance of what are intended to be high-insulation structures.A previous joint project between SP Technical Research Institute of Sweden and Chalmers University of Technology investigated the importance of airtightness in the construction process. The project found that many types of damage and problems were caused by poor airtightness, that airtightness was seldom given the proper consideration that it deserved and that there was a major need for information on the effect of poor airtightness. One of the conclusions was that it is important to get developers/clients to treat airtightness more seriously.The objective of the follow-on project that is described here is therefore to make developers/clients (more) aware of the potential damage that can be caused by poor airtightness, together with the “cost” of this damage/problem in a life-cycle perspective. Hopefully, developers/clients will then specify and monitor airtightness requirements more clearly. The aim is therefore to develop tools and methods for informing developers/clients of the importance of good airtightness, and of the resulting extra costs that incur from paying insufficient attention to airtightness.The project has identified and assessed various consequences of poor airtightness, such as increased energy use, reduced thermal comfort, reduced air quality and moisture damages.The cost calculations show that the developer/client would benefit in most cases from an increased standard and follow up on airtightness. We have projected the work with three different levels of ambition: 0.2, 0.4 and 0.6 l/m2s (at 50 Pa pressure difference), and believe that the optimal airtightness lies somewhere in the region of these values, depending on the buildings use and equipment.
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