Strategy

Appropriately use heat recovery to minimize the additional energy consumption associated with higher ventilation rates for mechanically ventilated areas.  For naturally ventilated spaces, follow the eight design steps described in the Carbon Trust Good Practice Guide 237:

-Develop design requirements;

-Plan airflow paths;

-Identify building uses and features that might require special attention;

-Determine ventilation requirements;

-Estimate external driving pressures;

-Select types of ventilation devices;

-Size ventilation devices;

-And analyze the design.

Use public domain software, such as NIST’s CONTAM and Multizone Modeling Software, along with LoopDA and a Natural Ventilation Sizing Tool, to analytically predict room-by-room airflows.