Ventilation Positive Pressure Intervention Effect on IAQ in a School Building with Moisture Problems

Vornanen-Winqvist, Camilla; Järvi, Kati; Toomla, Sander; Ahmed, Kaiser; Andersson, Maria A.; Mikkola, Raimo; Marik, Tamás; Kredics, László; Salonen, Heidi; Kurnitski, Jarek

doi:10.20944/preprints201712.0003.v1

Cited by 1 publication

(1 citation statement)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…measurements of real buildings for compliance with building regulations [5], whereas a 10 Pa pressure difference is used in the Canadian CGSB 149.10 standard [6] to calculate, for instance, the equivalent leakage area. At 4 Pa pressure difference or less, natural infiltration usually occurs in buildings, which is an essential metric in indoor air quality applications [47] and building energy simulations [48].…”

Section: Airflow-pressure Difference Measurementsmentioning

confidence: 99%

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

Kölsch

Walker

Schiricke

et al. 2021

International Journal of Ventilation

View full text Add to dashboard Cite

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.

show abstract

Section: Airflow-pressure Difference Measurementsmentioning

confidence: 99%

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

Kölsch

Walker

Schiricke

et al. 2021

International Journal of Ventilation

View full text Add to dashboard Cite

show abstract

Ventilation Positive Pressure Intervention Effect on IAQ in a School Building with Moisture Problems

Abstract: This case study investigates the effects of ventilation intervention on measured and 12 perceived indoor air quality (IAQ) in a repaired school where occupants reported IAQ problems. 13Occupants´ symptoms were suspected to be related to the impurities leaked indoors through the

Cited by 1 publication

References 1 publication

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

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

Contact Info

Product

Resources

About