UNCERTAINTY EVALUATION OF SINGLE-POINT FAN PRESSURIZATION MEASUREMENTS FOR CALM AND ASSUMED WINDY CONDITIONS

作者：Ipbueker Cagatay; Valge Margus; Vilbaste Martin; Mauring Tonu; Tkaczyk Alan H^*

来源：Fresenius Environmental Bulletin, 2014, 23(7): 1529-1538.

• Airtightness
• uncertainty estimation
• fan pressurization test
• n(50)
• GUM Workbench

The latest innovations in the building industry strengthen ties between the airtightness of the building envelope, heat demand and construction techniques. The fan pressurization test is the pre-eminent field measurement for airtightness. It combines various measurements contributing to a high level of uncertainty. This paper studies the uncertainty estimation of each parameter involved in a single-point fan pressurization test. It also aims to provide a certain perspective and recommendations in this respect. This study focuses on the uncertainty estimation and evaluation of single-point fan pressurization tests performed on 35 houses in Estonia during 2008-2011, in which the air change rates at 50 Pa (n(50)) varied between 0.41 h(-1) to 14.4 h(-1). The mean n(50) value from our dataset was 4.84 h(-1) and the median 3.00 h(-1). The median value is found to be in agreement with n(50) values of contemporary buildings. Uncertainty budgets for the buildings were composed using GUM Workbench where all the test parameters were evaluated. Net volume measurements, zero-flow pressure readings, air leakage rate, uncertainty due to pressure fluctuations, and the calibration of air flow meter and outdoor air pressure meter were observed to have high uncertainty contributions.

• 出版日期2014