Environmental Engineering Reference
In-Depth Information
Figure 11.12
Effect of occupancy and ventilation on CO
levels in a San Francisco
2
office building. (From Turiel, I., et al.,
Atmos. Environ
., 17, 51, 1983. With permission.)
CO
levels can also be seen when Figures 11.12a and 11.12b are compared.
In Figure 11.12a , the HVAC system is being operated on 100% outside air;
in Figure 11.12b , it is being operated using a mixture of recirculated and
outdoor air.
2
ii. Indoor Air Quality Procedure. In 1982, ASHRAE introduced what
it described as the Indoor Air Quality (IAQ) Option. It was developed to
provide building system designers with an alternative to the Ventilation Rate
Procedure described above. It recognized that the Ventilation Rate Procedure
focused primarily on bioeffluent control and was not designed to control
contaminants generated in building spaces from construction materials, fur-
 
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