System and method for high ventilation of outdoor air

A method for high ventilation of outdoor air in an indoor area, the method comprising:

• detecting an activation of an emergency purge mode;
• adjusting at least one air damper of an HVAC unit to allow a maximum of outside air to flow through the HVAC unit without circulating return air;
• establishing a fan speed of a fan of the HVAC unit for maximum outside airflow through the HVAC unit;
• and
• modifying the fan speed of the fan based on an occupant comfort criteria, the fan speed being modified, at least in part, based on a delta enthalpy of the HVAC unit and a nominal capacity of the HVAC unit, wherein modifying the fan speed of the fan includes:
• managing the fan speed, using an open loop logic, based on the delta enthalpy of the HVAC unit and the nominal capacity of the HVAC unit;
• and
• refining the fan speed, using a closed loop logic, based on at least one of a room temperature of the indoor area or a discharge air temperature of the HVAC unit.

A non-transitory computer readable medium including executable instructions which, when executed, causes at least one processor to provide high ventilation of outdoor air in an indoor area by:

• detecting an activation of an emergency purge mode;
• adjusting at least one air damper of an HVAC unit to allow a maximum of outside air to flow through the HVAC unit without circulating return air;
• establishing a fan speed of a fan of the HVAC unit for maximum outside airflow through the HVAC unit;
• and
• modifying the fan speed of the fan based on an occupant comfort criteria, the fan speed being modified, at least in part, based on a delta enthalpy of the HVAC unit and a nominal capacity of the HVAC unit, wherein modifying the fan speed of the fan includes:
• managing the fan speed, using an open loop logic, based on the delta enthalpy of the HVAC unit and the nominal capacity of the HVAC unit;
• and
• refining the fan speed, using a closed loop logic, based on at least one of a room temperature of the indoor area or a discharge air temperature of the HVAC unit.