Economizer temperature extrapolation systems and methods
A heating, ventilation, and air conditioning system includes a plurality of sensors including a first sensor configured to measure an outside air temperature of outside air, a second sensor configured to measure a return air temperature of return air, and a third sensor configured to measure a mixed air temperature of mixed air. The system also includes a controller communicatively coupled to the plurality of sensors. The controller is configured to determine that data from one of the plurality of sensors is unavailable and estimate the data from the one of the plurality of sensors based on data from other sensors of the plurality of sensors.
1. A heating, ventilation, and air conditioning (HVAC) system, comprising:
a plurality of sensors, comprising: a first sensor configured to measure an outside air temperature of outside air, a second sensor configured to measure a return air temperature of return air, and a third sensor configured to measure a mixed air temperature of mixed air; and
a controller communicatively coupled to the plurality of sensors, wherein the controller is configured to determine that data from one of the plurality of sensors is unavailable and estimate the data from the one of the plurality of sensors based on data from other sensors of the plurality of sensors, wherein the data from the other sensors of the plurality of sensors comprises at least two of: the outside air temperature of outside air, the return air temperature of return air, and the mixed air temperature of mixed air.
2. The HVAC system of claim 1 , comprising a damper configured to control air flow through an air economizer having the plurality of sensors, wherein the controller is communicatively coupled to the damper and configured to determine the data from the one of the plurality of sensors based on a position of the damper.
3. The HVAC system of claim 2 , wherein the one of the plurality of sensors is the first sensor, and the other sensors on the plurality of sensors are the second sensor and the third sensor.
4. The HVAC system of claim 3 , wherein the controller is configured to actuate the position of the damper to at least approximately 10% open when determining the data from the one of the plurality of sensors based on the data from other sensors of the plurality of sensors.
5. The HVAC system of claim 1 , wherein the controller is configured to activate an alarm upon determining that the data from the one of the plurality of sensors is unavailable.
6. The HVAC system of claim 1 , wherein the one of the plurality of sensors is the first sensor, and the other sensors of the plurality of sensors are the second sensor and the third sensor.
7. The HVAC system of claim 1 , wherein the one of the plurality of sensors is the second sensor, and the other sensors of the plurality of sensors are the first sensor and the third sensor.
8. The HVAC system of claim 7 , comprising a damper configured to control air flow through an air economizer having the plurality of sensors, wherein the controller is communicatively coupled to the damper.
9. The HVAC system of claim 8 , wherein the controller is configured to actuate a position of the damper to no more than approximately 90% open when determining the data from the second sensor based on the data from the first sensor and the third sensor.
10. The HVAC system of claim 9 , wherein the controller is configured to determine the data from the second sensor based on the position of the damper.
11. The HVAC system of claim 1 , wherein the plurality of sensors consists essentially of the first sensor, the second sensor, and the third sensor.
12. An air economizer of a heating, ventilation, and air conditioning (HVAC) system, comprising:
a damper configured to control air flow through the air economizer;
an outside air temperature sensor adapted to measure an outside air temperature of outside air during functional operation;
a return air temperature sensor adapted to measure a return air temperature of return air during functional operation;
a mixed air temperature sensor adapted to measure a mixed air temperature of mixed air during functional operation; and
a controller communicatively coupled to the damper, the outside air temperature sensor, the return air temperature sensor, and the mixed air temperature sensor, wherein the controller is configured to:
determine that a single one of the outside air temperature sensor, the return air temperature sensor, and the mixed air temperature sensor is a functionally unavailable sensor while a remaining two sensors of the outside air temperature sensor, the return air temperature sensor, and the mixed air temperature sensor are functional; and
estimate a respective measurement of the functionally unavailable sensor based on a position of the damper and data provided by the remaining two sensors, wherein the data provided by the remaining two sensors comprises at least two of: the outside air temperature of outside air, the return air temperature of return air, and the mixed air temperature of mixed air.
13. The air economizer of claim 12 , wherein the functionally unavailable sensor is the return air temperature sensor, and the remaining two sensors are the outside air temperature sensor and the mixed air temperature sensor.
14. The air economizer of claim 13 , wherein the controller is configured to actuate the position of the damper to no more than approximately 90% open when determining the respective measurement of the functionally unavailable sensor.
15. The air economizer of claim 12 , wherein the functionally unavailable sensor is the outside air temperature sensor, and the remaining two sensors are the return air temperature sensor and the mixed air temperature sensor.
16. The air economizer of claim 15 , wherein the controller is configured to actuate the position of the damper to at least approximately 10% open when determining the respective measurement of the functionally unavailable sensor.
17. The air economizer of claim 12 , wherein the controller is configured to activate an alarm upon determining that the single one of the outside air temperature sensor, the return air temperature sensor, and the mixed air temperature sensor is the functionally unavailable sensor.
18. An air economizer of a heating, ventilation, and air conditioning (HVAC) system configured to intake outside air from a surrounding environment, mix the outside air with return air from a building to form mixed air, and supply the mixed air to the building, wherein the air economizer comprises:
a damper configured to control air flow through the air economizer;
an outside air temperature sensor configured to measure an outside air temperature of the outside air;
a return air temperature sensor configured to measure a return air temperature of the return air;
a mixed air temperature sensor configured to measure a mixed air temperature of the mixed air; and
a controller communicatively coupled to the damper, the outside air temperature sensor, the return air temperature sensor, and the mixed air temperature sensor, wherein the controller is configured to determine that the mixed air temperature sensor is unavailable and estimate the mixed air temperature based on a position of the damper, the return air temperature, and the outside air temperature.
19. The air economizer of claim 18 , wherein the controller is configured to activate an alarm upon determining that the mixed air temperature sensor is unavailable.