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A quantitative evaluation of airtightness measurement experiences
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. (Arcum)
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. (Arcum)ORCID iD: 0000-0003-1657-7376
2014 (English)In: NSB 2014 10th Nordic Symposium on Building Physics 15-19 June 2014 Lund, Sweden: FULL PAPERS / [ed] Jesper Arfvidsson, Lars-Erik Harderup, Anders Kumlin, Bitte Rosencrantz, 2014Conference paper, Published paper (Refereed)
Abstract [en]

Evaluation of building air tightness based on field measurements is an important aspect in the process to provide good indoor environment and energy efficient buildings. The measurements are generally conducted by experts. To improve field methods for evaluation of building air tightness, experience of these experts can be useful. The scope of this paper is to problematize usefulness of methods for airtightness measurements, how and when methods are used and potential for future development. Surveyed Swedish and Finnish experts have valued the performance and usefulness of methods in the perspective of being used for singe family, multifamily, new, inhabited, under construction, renovation, leaky and air-tight buildings. They also valued the future potential, as well as their own level of experience and expertise, of the methods. Although the results of the survey were based on a small set of collected data, it indicated that the experts favored methods with their highest assessed experience and expertise, i.e. Blower door and Surface temperature measurements/Thermography. Potential of future development within quantitative and component methods was assessed to be positive in general and in particular for the favored methods.

Place, publisher, year, edition, pages
2014.
Keyword [en]
air tightness, buildings, field measurements, survey, ZEF
National Category
Building Technologies
Identifiers
URN: urn:nbn:se:umu:diva-100814ISBN: 978-91-88722-53-9 (TVBH-3061) (print)OAI: oai:DiVA.org:umu-100814DiVA: diva2:794253
Conference
10th Nordic Symposium on Building Physics, 15 – 19 June 2014, Lund, Sweden
Projects
Increasing Energy Efficiecy in Buildings (IEEB)
Available from: 2015-03-10 Created: 2015-03-10 Last updated: 2016-05-23Bibliographically approved
In thesis
1. Achieving building energy performance: requirements and evaluation methods for residential buildings in Sweden, Norway, and Finland
Open this publication in new window or tab >>Achieving building energy performance: requirements and evaluation methods for residential buildings in Sweden, Norway, and Finland
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Building energy performance has always been important in the cold climate of Sweden, Norway and Finland. To meet the goal that all new buildings should be nearly zero-energy buildings by 2020, set in the EU directive 2010/31/EU [1] on the energy performance of buildings (EPBD recast), the building sector in Europe now faces a transition towards buildings with improved energy performance. In such a transition, a discussion is needed about the objective of the improvement – why, or to what end, the building energy performance should be improved. The objective of improving building energy performance is often a political decision, but scientific research can contribute with knowledge on how the objectives can be achieved.

This thesis addresses how the indicators used in the requirements used to achieve building energy performance in Sweden, Norway, and Finland, and the methods used to evaluate these requirements, reflect building energy performance. It also addresses difficulties in achieving comparable and verifiable indicators in evaluations of building energy performance. The research objective has two parts: to review, compare, and discuss (i) requirements and (ii) evaluation methods used to achieve energy performance of residential buildings in Sweden, Norway and Finland. The work in this thesis includes reviews of the requirements used in national building codes and passive house criteria to achieve building energy performance, of methods used to evaluate compliance with such requirements, and of methods used specifically to evaluate the indicator Envelope Air Tightness.

The results show that different sets of indicators are used to achieve building energy performance in the studied building codes and passive house criteria. The methods used to evaluate compliance with requirements used to achieve building energy performance are also different, but calculation methods are generally more often used than measurement methods. The calculation- and measurement methods used are often simple. A methodology to analyze the deviation between predictions- and measurements of building energy performance (the performance gap) was developed, to investigate the effects of different evaluation methods on different indicators used to achieve building energy performance. The methodology was tested in a case-study. This study indicated that the choice of method affects which parts of the performance gap reflected in the indicators Supplied Energy (see Terminology), Net Energy (see Terminology), and Overall U-value. Among the reviewed methods to evaluate air tightness, the Fan/Blower Door Pressurization is well known and preferred by professionals in the field. The results in this thesis may be useful when choosing indicators and evaluation methods to achieve different objectives of improving building energy performance and in the quest towards comparable and verifiable indicators used to achieve building energy performance.

Place, publisher, year, edition, pages
Umeå: Umeå universitet, 2015. 50 p.
Keyword
building codes, energy performance, evaluation methods, air tightness
National Category
Other Civil Engineering Building Technologies Energy Systems
Identifiers
urn:nbn:se:umu:diva-103749 (URN)978-91-7601-297-0 (ISBN)
Presentation
2015-06-04, MC 314, Umeå university, 901 87 Umeå, 16:33 (English)
Supervisors
Projects
Increasing Energy Efficiency in Buildings (IEEB)Sustainable Buildings for the High North (SBHN)
Available from: 2015-08-25 Created: 2015-05-28 Last updated: 2015-08-25Bibliographically approved

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Olofsson, ThomasAllard, Ingrid

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