A Method to Quantify Uncertainties in Airtightness Measurements Zero-Flow and Envelope Pressure
| Autor: | Sergio Altomonte, Arnaud Dawans, Martin Prignon, Geoffrey Van Moeseke |
|---|---|
| Přispěvatelé: | UCL - SST/ILOC - Faculté d'Architecture, d'Ingénierie architecturale, d'Urbanisme |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
020209 energy
Flow (psychology) 0211 other engineering and technologies Building airtightness 02 engineering and technology airtightness measurement law.invention fan pressurization test Cabin pressurization zero-flow pressure law 021105 building & construction 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Envelope (mathematics) Civil and Structural Engineering Mathematics Series (mathematics) Mechanical Engineering Zero (complex analysis) envelope pressure Building and Construction Mechanics uncertainties Regression Pressure measurement multi-level modelling |
| Zdroj: | Energy and Buildings, Vol. 188-189, p. 12-24 (2019) |
| Popis: | In airtightness measurements using the fan pressurization method, the calculation of uncertainties does not take into account the zero-flow pressure approximation. It was recently suggested that neglecting the uncertainties related to zero-flow pressure approximation could be an unrealistic hypothesis. In this study, a method for quantifying this source of uncertainty is proposed, illustrated and discussed. The method is applied to a series of 31 zero-flow pressure tests performed on a newly-constructed apartment within a period of 15 days in Brussels, Belgium. For each test, 32 different zero-flow pressure approximations were compared. Since the data had a nested structure, multiple multi-level models were used for their analysis. The results show that, for the tested building, the zero-flow pressure approximation uncertainty is 0.45, 0.91 and 1.52 Pa respectively under low-, medium- and large-wind conditions. These uncertainties can be reduced to 0.42, 0.80 and 1.39 Pa when using longer zero-flow pressure measurement periods. As a comparison, uncertainty in pressure measurement at 50 Pa due to the equipment is 0.25 Pa. The uncertainty of zero-flow approximation makes the envelope pressure uncertainty non-negligible, therefore having an impact on the regression technique used to determine the building airtightness. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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