Patent ID: 11906189
Assignee: SIEMENS INDUSTRY, INC.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A system for high ventilation using outdoor air in an indoor area comprising:
an HVAC unit including at least one damper and a fan; and
a controller configured to detect an activation of an emergency purge mode, adjust the at least one air damper to allow a maximum of outside air to flow through the HVAC unit without circulating return air, establish a fan speed of the fan for maximum outside airflow through the HVAC unit, and modify the fan speed of the fan based on an occupant comfort criteria,
wherein the fan speed is modified, at least in part, based on a delta enthalpy of the HVAC unit and a nominal capacity of the HVAC unit, and
wherein the controller manages 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 the controller refines 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.