Transition from n50 to actual air exchange dependent on climatic conditions
Authors:
- Tomasz Kisilewicz,
- Katarzyna Nowak-Dzieszko,
- Małgorzata Rojewska-Warchał
Abstract
The knowledge of the air flow and air exchange in the building is critical both on the design and operation stage of the building. Infiltration of air interferes with the mechanical ventilation and determines the proper functioning of the natural ventilation system, still commonly used in the standard buildings. The building airtightness can be described by n50 parameter, however it does not specify the real air exchange in natural conditions. According to the simple procedure of the standard EN ISO 13789, factor n50 may be easily converted to the monthly averaged air change rate. However, it is difficult to accept the same value of air change rate in any month of a year, as it is often done in the certification procedures. More precise, climate dependent conversion procedures have been elaborated in USA, but they were developed for the specific local building technology and local climate conditions. This paper presents the results of the preliminary measurements conducted in a single family house in Poland, built in a heavy-weight technology. The real air exchange rate was measured in various climatic conditions by means of gas tracing method, with CO2 as the tracer gas, in order to prove a relationship between the enhanced procedure and the external conditions. Acceptable agreement between the results of the measurement and model calculations was obtained. Based on the preliminary results, the authors determined the more realistic influence of the enhanced algorithm on the ventilation energy demand. The use of the simplified model resulted in case of the analyzed object in 15% overestimation of the ventilation thermal losses.
- Record ID
- CUTf181bea28fc541f3a9b7a3c3f3950ca5
- Publication categories
- ; ;
- Author
- Journal series
- MATEC Web of Conferences, ISSN , e-ISSN 2261-236X, Irregular
- Issue year
- 2019
- Vol
- 282
- Pages
- [1-6]
- Article number
- 02101
- Other elements of collation
- fot.; tab.; wykr.; Bibliografia (na s.) - 6; Bibliografia (liczba pozycji) - 14; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 282
- Conference
- 4th Central European Symposium on Building Physics (CESBP 2019), 2019, 02-09-2019 - 05-09-2019, Prague, Czechy
- Keywords in English
- natural ventilation, air tightness, infiltration, thermal comfort, indoor air quality
- DOI
- DOI:10.1051/matecconf/201928202101 Opening in a new tab
- URL
- https://www.matec-conferences.org/articles/matecconf/abs/2019/31/matecconf_cesbp2019_02101/matecconf_cesbp2019_02101.html Opening in a new tab
- Language
- eng (en) English
- License
- Score (nominal)
- 5
- Additional fields
- Indeksowana w: Web of Science
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUTf181bea28fc541f3a9b7a3c3f3950ca5/
- URN
urn:pkr-prod:CUTf181bea28fc541f3a9b7a3c3f3950ca5
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.