Quantification of uncertainty in zero-flow pressure approximation

Prignon, Martin; Dawans, Arnaud; Moeseke, Geoffrey Van

doi:10.1080/14733315.2020.1777020

Cited by 2 publications

(4 citation statements)

References 8 publications

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“…More recently, these issues are getting tackled by the adoption of alternative regression methods, that include the weighting of the uncertainty for each pressure-airflow measurement in a test, and by the consideration of a larger amount of error sources in the calculation of the total uncertainty [31][32][33]. The weighting allows for the addressing of the non-constant uncertainties in both the measured variables.…”

Section: Results Reliabilitymentioning

confidence: 99%

“…The WLOC method adds on top of OLSu the contribution of pressure differential readings, including the direct effect of wind with the zeroflow approximation component. A simple linear model ε = (0.11 + 0.98σ) was found to be a proper predictor of this component [31], being σ the standard deviation of the measured zero-flow pressure points. As the points distribution tested significant for normality [20], considering an interval containing 50% of its values results in ε/1.35.…”

Section: Regression Parametersn and C Envmentioning

confidence: 97%

“…The accuracy and resolution uncertainties of the used equipment were considered as uniform distributions while the standard deviation on zero-flow pressure was approximated as a normal distribution, as pointed in recently developed work [20,31]. These sources of error and their joint uncertainty are used in the quantification of weights for the application of WLOC.…”

Section: Uncertainty Analysismentioning

confidence: 99%

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Reliability of quantitative and qualitative assessment of air leakage paths through reductive sealing

Cardoso

Ramos

Almeida

et al. 2020

Building and Environment

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A full characterization of a building air leakage is labour intensive. As results of laboratory and mock-up experimentation rarely portray in situ conditions, the assessment of real case studies bring added value. Still, the results of experimentation of the latter face more challenges than the former. In this work a full quantitative and qualitative assessment of air leakage paths is performed, using a light steel framing (LSF) modular building with structural insulated panels (SIPs) as case study. Blower-door measurements undergo for a sealing campaign of eleven steps, a technique often described as reductive sealing. Additionally, smoke tracer measurements were carried out to visually identify the air leakage locations. The application of three regression methods resulted in different uncertainty estimates. Less than 7% of the total air leakage was not attributed to one of the considered types of air leakage paths. Assessing less impacting leakage paths first and placing similar types of air leakage paths in a consecutive sealing order seems to be the most correct strategy when using the reductive sealing technique. On average, at a reference pressure difference of 4 Pa, the sealing step uncertainty averaged, 9.9%, 18.8%, and 27.5%, depending on the method used for regression of the blower door test results. Despite the highest calculated uncertainty, literature shows that the application of the method leading to it, Weighted Line of Organic Correlation (WLOC), provides the results in closer agreement with the observed uncertainty of measurements.

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Section: Results Reliabilitymentioning

confidence: 99%

Section: Regression Parametersn and C Envmentioning

confidence: 97%

Section: Uncertainty Analysismentioning

confidence: 99%

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Reliability of quantitative and qualitative assessment of air leakage paths through reductive sealing

Cardoso

Ramos

Almeida

et al. 2020

Building and Environment

Self Cite

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“…Hence, the locations of air leakages are well known in the literature. Furthermore, Prignon et al [10] developed a method to understand air displacements at weak spots using PIG-charts which is a graph presenting the airflow against an important parameter.…”

Section: Introductionmentioning

confidence: 99%

Air leakage paths in buildings: Typical locations and implications for the air change rate

et al. 2020

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The harsh Norwegian climate requires buildings designed to high standards. An airtight building envelope is crucial to achieve an energy efficient building and to avoid moisture problems. Results from the SINTEF Building defects archive show that a considerable part of the building defects is related to air leakages. In addition, air leakages increase the energy demand of buildings. A literature study has been conducted in order to map typical air leakage paths of Norwegian wooden houses. In order to increase the performance, different sealing methods including the use of tape has been reviewed. The results show that the most common air leakages reported from field measurements in the literature are in the connections between external wall and ceiling or floor, external wall and window or door, and external wall and penetrations in the barrier layers. Results from laboratory investigations showed that the traditional solutions can be further improved by introduction of modern foil materials in combination with sealing tapes. However, questions can be raised regarding the necessity of tape sealing all available joints.

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Quantification of uncertainty in zero-flow pressure approximation

Cited by 2 publications

References 8 publications

Reliability of quantitative and qualitative assessment of air leakage paths through reductive sealing

Reliability of quantitative and qualitative assessment of air leakage paths through reductive sealing

Air leakage paths in buildings: Typical locations and implications for the air change rate

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