Indoor Air Quality

Another factor which is often neglected in the application of ECOs is the effect of system changes on indoor air quality. Indoor air quality requirements are most commonly met with ventilation and filtration provided by an all-air or air-water HVAC system. When outdoor air quantities are altered significantly, the effect on indoor air quality is unknown and must be determined.

In a polluted environment, increasing outdoor air volume, for example with an economizer cycle, either increases filtration requirements or results in a deterioration of indoor air quality. On the other hand, reducing airflow to conditioned spaces due, for example, to a conversion to a variable air volume system, reduces the filtration of recycled indoor air which can likewise produce a reduction in air quality. The concerns regarding indoor air quality are discussed in more detail in Chapter 17.

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