Systems and methods for controlling energy use in a building management system using energy budgets
AssigneeJohnson Controls Technology Company
InventorMichael J. Wenzel
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Abstract
Systems and methods for limiting power consumption by a heating, ventilation, and air conditioning (HVAC) subsystem of a building are shown and described. A mathematical linear operator is found that transforms the unused or deferred cooling power usage of the HVAC system based on pre-determined temperature settings to a target cooling power usage. The mathematical operator is applied to the temperature settings to create a temperature setpoint trajectory expected to provide the target cooling power usage.
Claims20
A method for controlling power consumption of a cooling system of a building space during a limited power period of a day, comprising:
- using a controller of the cooling system to observe cooling power use resulting from a temperature setpoint trajectory of a first day, wherein the temperature setpoint trajectory of the first day comprises a pre-cooling period and a limited power period;
- using a controller of the cooling system to calculate a deferred cooling power use resulting from a temperature setpoint trajectory of a first day, wherein the deferred cooling power use is identified by comparing the observed cooling power use to an expected cooling power use for a constant temperature setpoint during the limited power period of the first day;
- finding a target deferred cooling power use for a second day;
- finding a linear operator that transforms the deferred cooling power use observed during the limited power period of the first day to the target deferred cooling power use;
- and
- applying the linear operator to a changing temperature setpoint trajectory of the first day's limited power period to create a temperature setpoint trajectory of a second day.
A controller for controlling power consumption of a cooling system of a building space during a limited power period of a day, comprising:
- a processing circuit configured to observe cooling power use resulting from a temperature setpoint trajectory over a pre-cooling period and a limited power period of a first day, the processing circuit configured to compute a deferred cooling power use resulting from a temperature setpoint trajectory of a first day, wherein the deferred cooling power use is identified by comparing the observed cooling power use to an expected cooling power use for a constant temperature setpoint during the limited power period of the first day, to compute a target deferred cooling power use for a second day, and to compute a linear operator that transforms the deferred cooling power use observed during the limited power period of the first day to the target deferred cooling power use, the processing circuit further configured to apply the linear operator to a changing temperature setpoint trajectory of the first day's limited power period to create a temperature setpoint trajectory of a second day.
Dependencies are inferred from the claim text.