Systems and methods for controlling rate of change of air temperature in a building
A system and method for controlling the air temperature in a building. The system includes one or more equipment of a heating ventilation and air-conditioning (HVAC) system, at least one of one or more thermostats or one or more temperature sensors, and a controller. The controller includes a communication module to exchange data with one or more devices and an equipment interface configured to communicate control signals to the one or more equipment. The controller is configured to obtain as user input a target rate of change (ROC) of air temperature in the building and operate the one or more equipment of the HVAC system to achieve the target ROC. The controller operates the one or more equipment at an initial capacity and adjusts the capacity of the one or more equipment to achieve the target ROC of the air temperature in the building.
1. A system for controlling air temperature in a building, comprising:
one or more equipment associated with a heating ventilation and air-conditioning (HVAC) system;
at least one of one or more thermostats or one or more temperature sensors for recording the air temperature in the building; and
a controller communicatively coupled to the one or more equipment and the at least one of the one or more thermostats or the one or more temperature sensors, wherein the controller comprises:
a communication module to exchange data with one or more devices; and
an equipment interface configured to communicate control signals to the one or more equipment to control operation of the one or more equipment;
wherein the controller is configured to:
obtain as user input a target rate of change (ROC) of air temperature in the building; and
operate the one or more equipment of the HVAC system to achieve the target ROC, wherein the controller is configured to operate the one or more equipment by:
operating the one or more equipment of the HVAC system at an initial capacity; and
adjusting the capacity at which the one or more equipment of the HVAC system operates to achieve the target ROC of the air temperature in the building.
2. The system of claim 1 , wherein the controller is further configured to:
sample the air temperature in the building at a plurality of sampling events according to a schedule; and
adjust the capacity of the one or more equipment by:
increasing the capacity at which the one or more equipment operates by a first amount in response to detecting no change in the air temperature in a desired direction between two sampling events;
calculating a current ROC in the air temperature between the two sampling events in response to detecting a change in the air temperature in the desired direction; and
in response to calculating the current ROC:
increasing the capacity at which the one or more equipment operates by a second amount when the current ROC is less than the target ROC; or
decreasing the capacity at which the one or more equipment operates by a third amount when the current ROC is same as or exceeds the target ROC.
3. The system of claim 2 , wherein the controller is further configured to:
receive a heating call or a cooling call from the one or more thermostats; and
operate the one or more equipment of the HVAC system to achieve the target ROC, in response to the heating call or the cooling call.
4. The system of claim 3 , wherein the controller is configured to repeat the sampling and the adjusting steps until the heating call or the cooling call is removed.
5. The system of claim 4 , wherein the controller is further configured to:
initialize a stabilization period in response to receiving the heating call or the cooling call; and
initialize the sampling after expiration of the stabilization period.
6. The system of claim 2 , wherein at least one of the first amount, the second amount or the third amount is a fixed percentage of a maximum capacity of the one or more equipment.
7. The system of claim 1 , wherein the controller is further configured to:
operate the one or more equipment of the HVAC system by initializing a first equipment of the one or more equipment;
detect that the capacity of the first equipment is set to equal or exceed a selected maximum capacity of the first equipment;
in response to the detecting, switch from operating the first equipment to operate a second equipment of the one or more equipment; and
adjust the capacity at which the second equipment operates to achieve the target ROC of the air temperature in the building.
8. The system of claim 7 , wherein the controller is further configured to:
detect that the capacity of the second equipment is set to equal or less than a selected minimum capacity of the second equipment; and
in response, switch back to operating the first equipment.
9. The system of claim 1 , wherein the one or more equipment comprises at least one heating equipment capable of operating at a first plurality of capacities and at least one cooling equipment capable of operating at a second plurality of capacities.
10. The system of claim 1 , wherein the one or more devices comprises one or more computing devices communicatively coupled to the controller, wherein the controller obtains the user input from the one or more computing devices.
11. A controller for controlling air temperature in a building, comprising:
a communication module to exchange data with one or more devices; and
an equipment interface configured to communicate control signals to one or more equipment of a heating ventilation and air-conditioning (HVAC) system to control operation of the one or more equipment;
wherein the controller is configured to:
obtain as user input a target rate of change (ROC) of air temperature in the building; and
operate the one or more equipment of the HVAC system to achieve the target ROC, wherein the controller is configured to operate the one or more equipment by:
operating the one or more equipment of the HVAC system at an initial capacity; and
adjusting the capacity at which the one or more equipment of the HVAC system operates to achieve the target ROC of the air temperature in the building.
12. The controller of claim 11 , wherein the controller is further configured to:
sample the air temperature in the building at a plurality of sampling events according to a schedule; and
adjust the capacity of the one or more equipment by:
increasing the capacity at which the one or more equipment operates by a first amount in response to detecting no change in the air temperature in a desired direction between two sampling events;
calculating a current ROC in the air temperature between the two sampling events in response to detecting a change in the air temperature in the desired direction; and
in response to calculating the current ROC:
increasing the capacity at which the one or more equipment operates by a second amount when the current ROC is less the target ROC; or
decreasing the capacity at which the one or more equipment operates by a third amount when the current ROC is same as or exceeds the target ROC.
13. The controller of claim 12 , wherein the controller is configured to repeat the sampling and the adjusting steps until a heating call or a cooling call is removed.
14. The controller of claim 11 , wherein the controller is further configured to:
operate the one or more equipment of the HVAC system by initializing a first equipment of the one or more equipment;
detect that the capacity of the first equipment is set to equal or exceed a selected maximum capacity of the first equipment;
in response to the detecting, switch from operating the first equipment to operate a second equipment of the one or more equipment; and
adjust the capacity at which the second equipment operates to achieve the target ROC of the air temperature in the building.
15. The system of claim 14 , wherein the controller is further configured to:
detect that the capacity of the second equipment is set to equal or less than a selected minimum capacity of the second equipment; and
in response, switch back to operating the first equipment.