Humidifier control systems and methods

1. A humidifier control system for a building, comprising:

an IAQ sensor module that is located within the building and that comprises:

a particulate sensor configured to measure an amount of particulate of at least a predetermined size present in air at the IAQ sensor module;

a volatile organic compound (VOC) sensor configured to measure an amount of VOCs present in air at the IAQ sensor module; and

an average module configured to determine an average relative humidity (RH) of air within the building;

an IAQ score module configured to determine an IAQ score value for air within the building based on the amount of particulate, the amount of VOCs, a RH of air within the building, and a temperature of air within the building; and

a humidifier control module configured to selectively open and close a water feed valve of a humidifier within the building based on the IAQ score value and the average RH.

2. The humidifier control system of claim 1 wherein the humidifier control module is configured to open the water feed valve of the humidifier in response to a determination that the average RH is less than a predetermined RH while a blower that blows air through the humidifier is on.

3. The humidifier control system of claim 2 wherein the humidifier control module is configured to maintain the water feed valve of the humidifier open until an increase in the IAQ score value over a period is less than or equal to zero.

4. The humidifier control system of claim 3 wherein the humidifier control module is configured to close the water feed valve of the humidifier in response to a determination that the increase in the IAQ score value over a period is less than or equal to zero.

5. The humidifier control system of claim 3 wherein the humidifier control module is configured to close the water feed valve of the humidifier in response to a determination that a temperature of air output by an air handler unit to the building is less than a predetermined temperature.

6. The humidifier control system of claim 2 further comprising a setpoint module configured to adjust the predetermined RH in response to receipt of user input.

7. The humidifier control system of claim 1 wherein the humidifier control module is further configured to turn on a humidifier blower when the water feed valve is open.

8. The humidifier control system of claim 1 wherein the humidifier control module is configured to close the water feed valve of the humidifier in response to a determination that a temperature of air output by an air handler unit to the building is less than a predetermined temperature.

9. The humidifier control system of claim 1 wherein the IAQ sensor module further includes:

a temperature sensor configured to measure the temperature of air; and

a RH sensor configured to measure the RH of air.

10. The humidifier control system of claim 1 wherein the IAQ sensor module further includes a carbon dioxide sensor configured to measure an amount of carbon dioxide present in air at the IAQ sensor module, and

wherein the IAQ score module is configured to determine the IAQ score value for the air further based on the amount of carbon dioxide.

11. The humidifier control system of claim 10 wherein at least one of:

the IAQ score module is configured to decrease the IAQ score value when the amount of particulate is greater than a predetermined amount of particulate;

the IAQ score module is configured to decrease the IAQ score value when the amount of VOCs is greater than a predetermined amount of VOCs;

the IAQ score module is configured to decrease the IAQ score value when the amount of carbon dioxide is greater than a predetermined amount of carbon dioxide;

the IAQ score module is configured to decrease the IAQ score value when the RH is outside of a predetermined RH range; and

the IAQ score module is configured to decrease the IAQ score value when the temperature is outside of a predetermined temperature range.

12. The humidifier control system of claim 10 wherein all of:

the IAQ score module is configured to decrease the IAQ score value when the amount of particulate is greater than a predetermined amount of particulate;

the IAQ score module is configured to decrease the IAQ score value when the amount of VOCs is greater than a predetermined amount of VOCs;

the IAQ score module is configured to decrease the IAQ score value when the amount of carbon dioxide is greater than a predetermined amount of carbon dioxide;

the IAQ score module is configured to decrease the IAQ score value when the RH is outside of a predetermined RH range; and

the IAQ score module is configured to decrease the IAQ score value when the temperature is outside of a predetermined temperature range.

13. The humidifier control system of claim 10 wherein at least one of:

the IAQ score module is configured to decrease the IAQ score value as a first period that the amount of particulate has been greater than a predetermined amount of particulate increases;

the IAQ score module is configured to decrease the IAQ score value as a second period that the amount of VOCs has been greater than a predetermined amount of VOCs increases;

the IAQ score module is configured to decrease the IAQ score value as a third period that the amount of carbon dioxide has been greater than a predetermined amount of carbon dioxide increases;

the IAQ score module is configured to decrease the IAQ score value as a fourth period that the RH has been outside of a predetermined RH range increases; and

the IAQ score module is configured to decrease the IAQ score value as a fifth period that the temperature has been outside of a predetermined temperature range increases.

14. A humidifier control method, comprising:

by a particulate sensor of an indoor air quality (IAQ) sensor module within a building, measuring an amount of particulate of at least a predetermined size present in air at the IAQ sensor module;

by a volatile organic compound (VOC) sensor of the IAQ sensor module within the building, measuring an amount of VOCs present in air at the IAQ sensor module; and

determining an average relative humidity (RH) of air within the building;

determining an IAQ score value for air within the building based on the amount of particulate, the amount of VOCs, a RH of air within the building, and a temperature of air within the building; and

selectively opening and closing a water feed valve of a humidifier within the building based on the IAQ score value and the average RH.

15. The humidifier control method of claim 14 wherein selectively opening and closing a water feed valve includes opening the water feed valve of the humidifier in response to a determination that the average RH is less than a predetermined RH while a blower that blows air through the humidifier is on.

16. The humidifier control method of claim 15 wherein selectively opening and closing a water feed valve includes maintaining the water feed valve of the humidifier open until an increase in the IAQ score value over a period is less than or equal to zero.

17. The humidifier control method of claim 16 wherein selectively opening and closing a water feed valve includes closing the water feed valve of the humidifier in response to a determination that the increase in the IAQ score value over a period is less than or equal to zero.

18. The humidifier control method of claim 16 wherein selectively opening and closing a water feed valve includes closing the water feed valve of the humidifier in response to a determination that a temperature of air output by an air handler unit to the building is less than a predetermined temperature.

19. The humidifier control method of claim 15 further comprising adjusting the predetermined RH in response to receipt of user input.

20. The humidifier control method of claim 14 further comprising turning on a humidifier blower when the water feed valve is open.

21. The humidifier control method of claim 14 wherein selectively opening and closing a water feed valve includes closing the water feed valve of the humidifier in response to a determination that a temperature of air output by an air handler unit to the building is less than a predetermined temperature.

22. The humidifier control method of claim 14 further comprising:

by a temperature sensor of the IAQ sensor module, measuring the temperature of air; and

by a RH sensor of the IAQ sensor module, measuring the RH of air.

23. The humidifier control method of claim 14 further comprising, by a carbon dioxide sensor of the IAQ sensor module within the building, measuring an amount of carbon dioxide present in air at the IAQ sensor module, and

wherein determining the IAQ score value includes determining the IAQ score value for the air further based on the amount of carbon dioxide.

24. The humidifier control method of claim 23 wherein determining an IAQ score value includes at least one of:

decreasing the IAQ score value when the amount of particulate is greater than a predetermined amount of particulate;

decreasing the IAQ score value when the amount of VOCs is greater than a predetermined amount of VOCs;

decreasing the IAQ score value when the amount of carbon dioxide is greater than a predetermined amount of carbon dioxide;

decreasing the IAQ score value when the RH is outside of a predetermined RH range; and

decreasing the IAQ score value when the temperature is outside of a predetermined temperature range.

25. The humidifier control method of claim 23 wherein determining an IAQ score value includes all of:

decreasing the IAQ score value when the amount of particulate is greater than a predetermined amount of particulate;

decreasing the IAQ score value when the amount of VOCs is greater than a predetermined amount of VOCs;

decreasing the IAQ score value when the amount of carbon dioxide is greater than a predetermined amount of carbon dioxide;

decreasing the IAQ score value when the RH is outside of a predetermined RH range; and

decreasing the IAQ score value when the temperature is outside of a predetermined temperature range.

26. The humidifier control method of claim 23 wherein determining an IAQ score value includes at least one of:

decreasing the IAQ score value as a first period that the amount of particulate has been greater than a predetermined amount of particulate increases;

decreasing the IAQ score value as a second period that the amount of VOCs has been greater than a predetermined amount of VOCs increases;

decreasing the IAQ score value as a third period that the amount of carbon dioxide has been greater than a predetermined amount of carbon dioxide increases;

decreasing the IAQ score value as a fourth period that the RH has been outside of a predetermined RH range increases; and

decreasing the IAQ score value as a fifth period that the temperature has been outside of a predetermined temperature range increases.