Application of CO{sub 2}-based demand-controlled ventilation using ASHRAE Standard 62: Optimizing energy use and ventilation

Conference · Thu Dec 31 04:00:00 EST 1998

OSTI ID:687679

Schell, M B ^[1]; Turner, S; Shim, R O ^[2]

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1. Engelhard Sensor Technologies, Santa Barbara, CA (United States)
2. Chelsea Group, Ltd., Delray Beach, FL (United States)

CO{sub 2}-based demand-controlled ventilation (DCV), when properly applied in spaces where occupancies vary below design occupancy, can reduce unnecessary overventilation while implementing target per-person ventilation rates. A recent interpretation of ANSI/ASHRAE Standard 62-1989, Interpretation 1C 62-1989-27, has affirmed that carbon dioxide (CO{sub 2})-based demand-controlled ventilation (DCV) systems can use CO{sub 2} as an occupancy indicator to modulate ventilation below the maximum total outdoor air intake rate while still maintaining the required ventilation rate per person, provided that certain conditions are met. This paper, co-written by the author of the interpretation, provides guidelines on the application of CO{sub 2}-based DCV. In addition, a method is presented that allows reasonable estimates of the actual ventilation rate per person being effectively delivered to the space, based on comparing predicted CO{sub 2} ventilation levels with CO{sub 2} levels logged in an occupied space. Finally, a model is presented to evaluate various CO{sub 2}-based DCV strategies to predict their delivery of target per-person ventilation rates within the lag times required by the standard.

• OSTI ID: 687679
• Report Number(s): CONF-980650--
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
BUILDINGS
CARBON DIOXIDE
ENERGY CONSUMPTION
INDOOR AIR POLLUTION
MATHEMATICAL MODELS
OPTIMIZATION
RECOMMENDATIONS
STANDARDS
VENTILATION