Generating and implementing thermodynamic models of a structure
First Claim
1. An intelligent network-connected thermostat for controlling an operation of an HVAC system in a smart home environment, the thermostat comprising:
- HVAC control circuitry operable to actuate one or more elements of the HVAC system;
one or more sensors for measuring characteristics of the smart home environment; and
a processor coupled to the HVAC control circuitry and the one or more sensors and operable to cause the thermostat to perform operations including;
acquiring time information, temperature information, and HVAC actuation state information for a period of time during which the HVAC system controls a thermal environment of a structure;
determining a plurality of weighting factors corresponding to a respective plurality of predetermined basis functions, the weighted combination of basis functions characterizing an indoor temperature trajectory of the structure in response to a change in the HVAC actuation state, the basis functions including an inertial carryover component that characterizes a carryover of a rate of indoor temperature change that was occurring immediately prior to the change in actuation state; and
providing a thermodynamic model including the determined plurality of weighting factors corresponding to the respective plurality of predetermined basis functions.
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Abstract
In controlling the HVAC system, a need to determine an expected indoor temperature profile for a particular schedule of setpoint temperatures may arise. To make such a determination, a thermodynamic model of the structure is used. The thermodynamic model is generated by fitting weighting factors of a set of basis functions to a variety of historical data including time information, temperature information, and HVAC actuation state information. The set of basis functions characterize an indoor temperature trajectory of the structure in response to a change in HVAC actuation state, and include an inertial carryover component that characterizes a carryover of a rate of indoor temperature change that was occurring immediately prior to the change in actuation state.
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Citations
18 Claims
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1. An intelligent network-connected thermostat for controlling an operation of an HVAC system in a smart home environment, the thermostat comprising:
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HVAC control circuitry operable to actuate one or more elements of the HVAC system; one or more sensors for measuring characteristics of the smart home environment; and a processor coupled to the HVAC control circuitry and the one or more sensors and operable to cause the thermostat to perform operations including; acquiring time information, temperature information, and HVAC actuation state information for a period of time during which the HVAC system controls a thermal environment of a structure; determining a plurality of weighting factors corresponding to a respective plurality of predetermined basis functions, the weighted combination of basis functions characterizing an indoor temperature trajectory of the structure in response to a change in the HVAC actuation state, the basis functions including an inertial carryover component that characterizes a carryover of a rate of indoor temperature change that was occurring immediately prior to the change in actuation state; and providing a thermodynamic model including the determined plurality of weighting factors corresponding to the respective plurality of predetermined basis functions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification