Demand control ventilation with predictive humidity control

An environmental control system that delivers dehumidified outdoor air into a conditioned space, comprising:

• a dedicated outdoor air unit that includes an air mover;
• and
• a controller in operative communication with the dedicated outdoor air unit and including a processor and a memory, wherein the memory includes instructions executable on the processor which, when executed by the processor, cause the processor to:
• cause the air mover to control an airflow rate of the dehumidified outdoor air into the conditioned space to a first setpoint value to ventilate the conditioned space;
• determine a humidity metric of the conditioned space;
• and
• adjust the air mover to control the airflow rate to a second setpoint value that per occupant is greater than the first setpoint value per occupant, in response to the humidity metric that is above a predetermined threshold.

An environmental system controller, comprising:

• a processor;
• a communications interface operatively coupled to the processor;
• and
• a memory operatively coupled to the processor, wherein the memory includes instructions executable on the processor which, when executed by the processor, cause the processor to:
• cause an air mover to control an airflow rate of the dehumidified outdoor air into a conditioned space to a first setpoint value to ventilate the conditioned space;
• determine a humidity metric of the conditioned space;
• and
• issue an air mover adjustment command to adjust the air mover to control the airflow rate to a second setpoint value that per occupant is greater than the first setpoint value per occupant, in response to the humidity metric that is above a predetermined threshold.

A method of operating an environmental control system that delivers dehumidified outdoor air into a conditioned space, comprising:

• causing an air mover to control an airflow rate of the dehumidified outdoor air into the conditioned space to a first setpoint value to ventilate the conditioned space;
• determining a humidity metric of the conditioned space;
• and
• adjusting the air mover to control the airflow rate to a second setpoint value that per occupant is greater than the first setpoint value per occupant, in response to the humidity metric that is above a predetermined threshold.