Building Energy Modeling with OpenStudio by Larry Brackney Andrew Parker Daniel Macumber & Kyle Benne

Author:Larry Brackney, Andrew Parker, Daniel Macumber & Kyle Benne
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

HVAC systems with gravity dampers generally have OA supplied whenever the system is operating. These systems should use an “Always On Discrete” schedule in this field. HVAC systems that have motorized dampers generally close the OA intake at night when the building is unoccupied. These systems may also use the “HVAC Operation Schedule” described above to turn off OA at night, even if the night cycle mode is set to manage heating or cooling loads.

The second OA control option relates to economizer operation. Economizers are devices that allow cool OA to be drawn into the system to provide free cooling when OA conditions are favorable. The type of economizer and associated settings may be found in the Controller OA Object, as shown in Fig. 5.16.

A third control option specifies whether the OA system uses demand-controlled ventilation (DCV) . This is controlled via a switch on the controls page (Fig. 5.15). DCV is a control strategy that involves monitoring occupancy levels, typically via a proxy like CO2, and reduces OA below the design flow rate when the occupancy levels are lower.

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