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Abstract
To remove moisture by ventilating constructions is a well-known strategy, used successfully in numerous facades and roofs. However, simulating ventilation is often difficult as convection in this case is in another dimension than what is usually in focus in 1D hygrothermal simulations. There are strategies for simulating ventilation in 1D programs assuming a fixed air change rate (ACH). Unfortunately, ACH in roofs highly depend on wind direction and speed, hence a constant rate is a gross simplification. The article describes a comparative study between simulations with a 1D hygrothermal simulation program (WUFI) and simulations with BSim, a program in which the indoor climate can be simulated in different zones, in this case the ventilated attic. Focus is the effect of ACH in the attic on temperature and relative humidity. Finally, measurements of ACH in attics of ten single-family houses are presented. These measurements show that average ACH measured over more than two weeks differ very much from house to house although the ventilation openings in all houses seemed to be in accordance with current guidelines. Even measurements of the same attic differ considerably from time to time. The paper discusses what implications this should have on simulations.
Original language | English |
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Title of host publication | MATEC Web of Conferences : 4th Central European Symposium on Building Physics (CESBP 2019) |
Editors | R. Černý, J. Kočí, V. Kočí |
Number of pages | 6 |
Place of Publication | Prague, Czech Republic |
Publisher | EDP Sciences |
Publication date | Sept 2019 |
Pages | 1-6 |
Article number | 02073 |
DOIs | |
Publication status | Published - Sept 2019 |
Event | Central European Symposium on Building Physics 2019 - Faculty of Civil Engineering, CTU in Prague Thákurova 7 166 29 Prague, Czech Republic, Prague, Czech Republic Duration: 2 Sept 2019 → 5 Sept 2019 Conference number: 4 https://www.cesbp2019.org/ |
Conference
Conference | Central European Symposium on Building Physics 2019 |
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Number | 4 |
Location | Faculty of Civil Engineering, CTU in Prague Thákurova 7 166 29 Prague, Czech Republic |
Country/Territory | Czech Republic |
City | Prague |
Period | 02/09/2019 → 05/09/2019 |
Internet address |
Series | MATEC Web of Conferences |
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Volume | 282 |
ISSN | 2261-236X |
Keywords
- ventilation
- attic
- insulation
Fingerprint
Dive into the research topics of 'Air change rate in ventilated attics – reality and input for simulations'. Together they form a unique fingerprint.Projects
- 1 Finished
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Behov for dampspærrer i lofter
Hansen, T., Møller, E. B. & Peuhkuri, R. H.
01/03/2015 → 31/05/2020
Project: Research
Research output
- 1 Article in proceeding
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Hygrothermal conditions in ventilated attics with different air change rates and ceiling constructions
Morelli, M., Møller, E. B. & Hansen, T., 30 Jun 2020, 12th Nordic Symposium on Building Physics (NSB 2020). Kurnitski, J. & Kalamees, T. (eds.). EDP Sciences, p. 1-7 7 p. 07008. (E3S Web of Conferences, Vol. 172).Research output: Contribution to book/anthology/report/conference proceeding › Article in proceeding › Research › peer-review
Open AccessFile1 Citation (Scopus)38 Downloads (Pure)