Reducing the amount of outdoor air entering a space when an HVAC system is mechanically cooling or heating and an air-side economizer is inactive has distinct advantages. For some spaces, demand-controlled ventilation (DCV) based on changes in occupancy may be desirable. According to one method of DCV, ventilation rate is adjusted based on carbon-dioxide (CO2) level. Unfortunately, many designers do not have a clear understanding of the relationship between CO2 and ventilation and the ...

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