Akustisches Verfahren zur Dichtheitsprüfung

Bader, Nicki; Holstein, Peter; Eckert, Karsten; Münch, Hans-Joachim; Holtkamp, Luc; Eschut, Theo d’Archard van

doi:10.1007/978-3-658-19672-1_22

Cited by 3 publications

(1 citation statement)

References 1 publication

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“…Raman et al 10 already presented an approach to detect leakage locations in the building envelope using a microphone array and beam-forming methods. Furthermore, Bader et al 11 have explained a method that visualizes the ultrasound intensity to detect leakage spots in building envelopes. Tiddens et al 12 patented a system that uses ultrasound to localize leaks in building envelopes.…”

Section: Introductionmentioning

confidence: 99%

Detection of Air Leakage in Building Envelopes Using Ultrasound Technology

Kölsch

Tiddens

Schmiedt

et al. 2019

Symposium on Whole Building Air Leakage: Testing and Building Performance Impacts

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Heating energy represents a significant proportion of the total energy consumption of the Federal Republic of Germany. Thus, a reduction of heating energy demand in buildings is one of the central points of German energy saving and climate goals. Considering that the current rate of new building construction is approximately 1 %, the most significant energy saving potential lies in existing buildings. The analysis of existing buildings will thus become more important in the years to come. As a result, the development of new measurement systems to assess the need for renovation is required. In this context, detailed information about heat insulation and airtightness is essential. The current approaches to detect air leakage in building envelopes are mostly time consuming and expensive. Therefore, the development of an advanced and more inexpensive method is a vital step. In this paper, we 2 present a study about the feasibility and suitability of ultrasound technology to evaluate the size of air leakages in building envelopes. The advantage of ultrasound technology is that the corresponding wavelengths are small enough to penetrate small openings and that disturbing background noise is usually low. Moreover, the frequencies are above the human threshold of hearing; hence, working and living inside the building would be affected less by the measurement than by a blower door test or leakage detection with audible sound. To examine the suitability of this technology, we use an experimental setup of ultrasound microphones and a speaker in a test chamber. Within this setup, we measured different hole sizes and assessed whether they could be detected using ultrasonic frequency swept signals.

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Section: Introductionmentioning

confidence: 99%

Detection of Air Leakage in Building Envelopes Using Ultrasound Technology

Kölsch

Tiddens

Schmiedt

et al. 2019

Symposium on Whole Building Air Leakage: Testing and Building Performance Impacts

View full text Add to dashboard Cite

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Akustische Verfahren zur Ermittlung der Luftdichtheit von Bestandsgebäuden

Holstein

Bader

Moeck

et al. 2019

Denkmal Und Energie 2020

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Quantification of air leakage paths: a comparison of airflow and acoustic measurements

Kölsch

Walker

Schiricke

et al. 2021

International Journal of Ventilation

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Today, the fan pressurization method is the most frequently used method to evaluate a buildings' airtightness. However, the localization and quantification of leaks remain difficult. In this paper, an acoustic method is introduced to estimate the leakage size of single leaks.Acoustic and airflow measurements were conducted and compared in laboratory tests within the same boundary conditions. This work aims to investigate if various leak sizes can be predicted using acoustic measurement methods. The test apparatus consists of two chambers, separated by a test wall. This wall represents a single characteristic air leakage path. Various types of wall structures with different slit geometries, wall thicknesses, and insulation materials were investigated. The acoustic measurements were performed with a sound source placed in one chamber and ultrasonic microphones located in both chambers. These results were compared to measured airflows through the test wall to provide estimates of uncertainty in the acoustic approach, which indicate a linear trend. Finally, these laboratory measurements were compared to the same measurements at a real office building. Although the acoustic measurement uncertainty is still significant (greater than +/-50 %), the acoustic method has the potential to give an order of magnitude of single leak sizes.

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Akustisches Verfahren zur Dichtheitsprüfung

Cited by 3 publications

References 1 publication

Detection of Air Leakage in Building Envelopes Using Ultrasound Technology

Detection of Air Leakage in Building Envelopes Using Ultrasound Technology

Akustische Verfahren zur Ermittlung der Luftdichtheit von Bestandsgebäuden

Quantification of air leakage paths: a comparison of airflow and acoustic measurements

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