"Infiltration, Exfiltration and Inter-room Air Exchange Rates and their uncertainties in 26 Houses" 

Naohide Shinohara¹, Toshiyuki Kataoka², KouichiTakamine², Toshiyoshi Nakamura², Katsunori Motohashi², Kazuhiro  Nisijima³,  Michio Butsugan⁴, Gamo Masashi¹,

¹National Institute of Advanced Industrial Science and Technology
²Chemicals Evaluation and Research Institute,Japan
³Sigma-Aldrich Corporation
⁴Hitachi Chemical Co., Ltd.

8th International Conference - Healthy Buildings 2006 (Lisbon（Portugal）2006/6/5)

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Abstract

Air exchange rates were measured in 26 houses in Japan by the PFT method. Mean infiltration rates from outdoors were 0.59 to 1.5 /hr and the daily variabilities were 52% to 71% (for 4 houses)．These rates, calculated by 12 mass-balance equations for each house, have uncertainties because of the assumption of a perfect mixing state and errors in the emission rate and measured data. The rates were sometimes calculated as negative values. Therefore, the uncertainties were estimated and correction of the calculation of the air exchange rates is discussed. 

Keywords

Inter-Room Air exchange rate, Infiltration rate, Exfiltration rate, Daily variability, Uncertainty