Record Display for the EPA National Library Catalog


Main Title Air Exchange Rate Measurements in an IAQ Test House.
Author Guo, Z. ; Sparks, L. E. ; Bero, M. R. ;
CORP Author Acurex Environmental Corp., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Air Pollution Prevention and Control Div.
Publisher 1998
Year Published 1998
Report Number EPA-68-D4-0005; EPA/600/A-98/101;
Stock Number PB98-151749
Additional Subjects Air pollution monitoring ; Houses ; Indoor air quality ; Air flow ; Air infiltration ; Doors ; Flow rates ; Indoor air pollution ; Heating equipment ; Air conditioning equipment ; Ventilation systems ; Space HVAC systems ; Environmental tests ; Computerized simulation ; Mathematical models ; Air exchange rates
Library Call Number Additional Info Location Last
NTIS  PB98-151749 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 20p
In the past 6 years, over 1,000 tracer gas measurements have been made to determine the air exchange rates in the EPA Indoor Air Quality Test House. The major factors that affected the air exchange rate include: weather conditions, operation of the heating and air-conditioning (HAC) system, and closing or opening the interior doors. An empirical model that correlates air infiltration rate to indoor/outdoor temperature difference and outdoor wind speed can predict the air exchange rate with an average predictive error of 10%. The model also makes it possible to construct a continuous air exchange profile, with which the diurnal and annual patterns can be examined. With the HAC system on, the air exchange rate showed diurnal and annual patterns can be examined. With the HAC system on, the air exchange rate showed a moderate increase as compared to that with the system off. In a striking contrast, the interior doors had much greater impact on air exchange: under similar weather conditions, closing all interior doors doubled the air exchange rate when the HAC system was on. Type III mixing difficulty was observed in the test house. Results from extensive computer simulations showed that, for tracer decay method, air exchange rate calculated by using the data in the first hour and after 4 or 5 hours contained much greater error than that calculated by using the data in between. Recommendations are made for minimizing such error.