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Vapor Dispersions
Typical Ventilation Rate for
Table 12-7 Typical ventillation rate for houses in urban settings
Houses in an Urban Area
Construction Air Exchanges
Level per Hour
Tight 0.25
Average 0.50
Leaky 1.0
Very Leaky 2.0
The US EPA and the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) Standard
62.2-2016 recommends a minimum of 0.35 air changes per hour for acceptable indoor air quality in residential homes.
12.16 Additional Resources
More Information on Vapor Dispersion include:
D. A. Crowl and J. A. Louvar, Chemical Process Safety Fundamentals with Applications, 3rd Edition, Prentice Hall,
(2011), Prentice Hall, Upper Saddle River, NJ USA
Chapter 5 Toxic Release and Dispersion Models, pages 185 – 236
CCPS, Guidelines for Consequence Analysis of Chemical Releases, John Wiley and Sons, (1999), Hoboken, NJ USA
Chapter 2 Source Models – 2.3 Dispersion Models, pages76- 125
CCPS, Guidelines for Use of Vapor Cloud Dispersion Models, 2 , John Wiley and Sons, (1996), Hoboken, NJ USA
nd
R.E. Britter and J. McQuaid, Workbook on the Dispersion of Dense Gases, HSE Contract Research Report No. 17/1988
(1988)
SAChE® Certificate Program – Atmospheric Dispersion ELA967
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