Jayjock Michael, Havics Andrew Anthony
a Jayjock Associates, LLC , Langhorne , Pennsylvania.
b pH2, LLC , Avon , Indiana.
J Occup Environ Hyg. 2018 May;15(5):376-388. doi: 10.1080/15459624.2018.1438615.
Residential inter-zonal (e.g., between rooms) ventilation is comprised of fresh air infiltration in and exfiltration out of the whole house plus the "fresh" air that is entering (and exiting) the room of interest from other rooms or areas within the house. Clearly, the inter-zone ventilation rate in any room of interest will be greater than the infiltration/exfiltration ventilation rate of outdoor air for the whole house. The purpose of this study is to determine how much greater the inter-zonal ventilation rate is in typical U.S. residences compared to the whole house ventilation rate from outdoor air. The data for this statistical analysis came from HouseDB, a 1995 EPA database of residential ventilation rates. Analytical results indicate that a lognormal distribution provides the best fit to the data. Lognormal probability distribution functions (PDFs) are provided for various inter-zonal ventilation rates for comparison to the PDF for the whole house ventilation rates. All ventilation rates are expressed as air change rates per hour (ACH). These PDFs can be used as inputs to exposure models. This analysis suggests that if one were performing a deterministic analysis for unknown housing stocks in the U.S., a default mean and median ACH values of 0.4/hr and 0.3/hr, respectively, for whole house ventilation would be appropriate; and 0.7/hr and 0.6/hr, respectively, for inter-zonal ventilation.
住宅区域间（例如房间之间）的通风包括新鲜空气渗入和渗出整个房屋，以及从房屋内其他房间或区域进入（和离开）目标房间的“新鲜”空气。显然，任何目标房间的区域间通风率将大于整个房屋的室外空气渗入/渗出通风率。本研究的目的是确定与室外空气的整个房屋通风率相比，典型美国住宅的区域间通风率大多少。该统计分析的数据来自HouseDB，这是一个1995年美国环保署的住宅通风率数据库。分析结果表明对数正态分布最适合这些数据。提供了各种区域间通风率的对数正态概率分布函数（PDF），以便与整个房屋通风率的PDF进行比较。所有通风率均以每小时换气次数（ACH）表示。这些PDF可作为暴露模型的输入。该分析表明，如果对美国未知住房存量进行确定性分析，整个房屋通风的默认平均和中位数ACH值分别为0.4/小时和0.3/小时是合适的；区域间通风的默认平均和中位数ACH值分别为0.7/小时和0.6/小时。
