Patent ID: 11859849
Assignee: LENNOX INDUSTRIES INC.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 10:
11. A heating, ventilation, and air conditioning (HVAC) system comprising:
an evaporator coil disposed between a return air duct and a supply air duct;
a compressor fluidically connected to the evaporator coil;
a blower disposed between the evaporator and the supply air duct for providing a flow of air through the HVAC system;
an evaporator bypass line fluidically connecting the return air duct to an output airstream of the evaporator coil, the evaporator bypass line comprising a bypass damper for adjusting a first flow of air to an input of the evaporator coil and a second flow of air to the output airstream of the evaporator coil via the evaporator bypass line; and
a controller operatively coupled to the compressor, the blower, and the bypass damper, the controller operable to:
determine an operating mode of the HVAC system;
determine whether the minimum operating flow rate of the blower is greater than a predetermined supply air flow rate of the HVAC system; and
responsive to a determination that the minimum operating flow rate of the blower is greater than the predetermined supply air flow rate of the HVAC system, determine a recirculation portion of the first flow of air to divert from the supply air duct to the return air duct based on a difference between the minimum operating flow rate of the blower and the predetermined supply air flow rate of the HVAC system.