HVAC unit fan control systems and methods
AssigneeJohnson Controls Technology Company
InventorsGaurav S. Patil, Naushad Parapurath Monangat, John L. McElvany, Karan Garg
Life of this patent
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Abstract
The present disclosure relates to a heating, ventilating, and air conditioning (HVAC) unit configured to supply conditioned air to a conditioned space. The HVAC unit includes a first exhaust fan capable of operating at variable speeds and a second constant-speed fan. The HVAC unit also includes a controller configured to determine a target airflow to be provided to the conditioned space, cause actuation of the first exhaust fan at a variable fan speed when the target airflow is greater than zero, and cause actuation of the second exhaust fan when the target airflow is greater than an airflow threshold.
Claims26
A heating, ventilating, and air conditioning (HVAC) unit configured to supply conditioned air to a conditioned space, the HVAC unit comprising:
- a first exhaust fan capable of operating at variable speeds;
- a second constant-speed exhaust fan;
- and
- a controller configured to:
- determine a target supply airflow rate to be provided to the conditioned space;
- cause actuation of the first exhaust fan at a variable fan speed when the target supply airflow rate is greater than zero;
- and
- cause actuation of the second constant-speed exhaust fan and modulation of the first exhaust fan when the target supply airflow rate is greater than an airflow threshold.
A tangible, non-transitory, computer-readable medium storing instructions that, when executed by processing circuitry, cause the processing circuitry to:
- receive data regarding an air pressure within a conditioned space;
- receive data indicative of a pressure setpoint associated with the conditioned space;
- determine a target supply airflow rate to be provided to the conditioned space based on a difference between the air pressure and the pressure setpoint;
- and
- control modulation of a first exhaust fan configured to operate at variable speeds and actuation of a second constant-speed exhaust fan based on the target supply airflow rate.
A control system of a heating, ventilating, and air conditioning (HVAC) system comprising control circuitry configured to:
- determine a target airflow rate of supply air to be provided by an HVAC unit to a serviced space;
- cause actuation of a first exhaust fan in the HVAC unit capable of operating at variable speeds when the target airflow rate is greater than zero;
- and
- cause actuation of a second, constant speed exhaust fan in the HVAC unit and modulation of the first exhaust fan when the target airflow rate is greater than an airflow threshold.
Dependencies are inferred from the claim text.