Predicting future indoor air temperature for building

A non-transitory computer readable medium storing a program of instructions that when executed by at least one processor of a computer, cause the computer to:

• receive, over a network communication, information about a physical property of the building, information about environmental conditions, and thermostat set point information;
• determine thermodynamic properties of the building using the received information about the physical property of the building, wherein the thermodynamic properties of the building define a rate at which an indoor temperature within the building changes as a function of:
• (i) the received information about the physical property of the building, and (ii) the received information about environmental conditions;
• wherein determining the thermodynamic properties of the building comprises:
• setting a plurality of thermodynamic variables α, β, and γ to initial values;
• and
• optimizing the plurality of thermodynamic variables α, β, and γ by utilizing an optimization method to minimize error between a calculated indoor air temperature at a time i+1 and a measured indoor air temperature at the time i+1;
• where indoor_tempi+1=α*indoor_tempi+(1−α)*(outdoor_tempi−HVAC_statei*β+solar radiationi*γ)
• where the indoor_tempi+1 is the calculated indoor air temperature for the building at the time i+1,
• the indoor_tempi is an indoor air temperature for the building at a time i,
• the outdoor_tempi is an outdoor air temperature for the building at the time i,
• the HVAC_statei is an operating state of an HVAC system of the building at the time i,
• the solar radiationi corresponds to solar radiation on the building at the time i, and
• the time i and the time i+1 are times previous to a current time,
• wherein the optimized thermodynamic variables α, β, and γ correspond to insulation properties of the building, HVAC system properties of the building, and an effect of solar radiation on the building, respectively;
• determine an efficiency of the building based on the determined thermodynamic properties;
• compare the determined efficiency of the building to efficiencies of buildings similar to the building to determine a relative efficiency of the building;
• display the determined relative efficiency on a device;
• calculate the future indoor air temperature at a plurality of time intervals using the determined thermodynamic properties of the building, the received information about environmental conditions, and the received thermostat set point information;
• generate, by at least the processor, an optimized thermostat set point schedule for at least one thermostat in the building using the estimated future indoor air temperature at the plurality of time intervals;
• and
• based on the estimated future indoor air temperature at the plurality of time intervals, cause load shifting of energy usage by reducing the energy usage of an HVAC system of the building during a peak use event while maintaining a desired indoor air temperature inside of the building by adjusting the thermostat set point schedule to cause the HVAC system to pre-cool the building before the peak use event based on the future indoor air temperature at time intervals prior to a time of the peak use event, and maintaining the desired indoor air temperature inside of the building during the time of the peak use event.

A system for determining thermodynamic properties of a building and estimating a future indoor air temperature for the building, the system comprising:

• a receiver configured to receive, by network communications, information about a physical property of the building, information about environmental conditions, and thermostat set point information;
• at least one processor connected to at least the receiver and to at least one memory, wherein the at least one memory including instructions that are executable by the at least one processor;
• the instructions, when executed by the at least one processor, cause the processor to implement:
• a thermodynamic property determiner configured to determine thermodynamic properties of the building using the processor and the received information about the physical property of the building, wherein the thermodynamic properties of the building define a rate at which an indoor temperature within the building changes as a function of:
• (i) the received information about the physical property of building, and (ii) the received information about environmental conditions;
• wherein the thermodynamic properties of the building are determined by at least:
• setting a plurality of thermodynamic variables α, β, and γ to initial values;
• and
• optimizing the plurality of thermodynamic variables α, β, and γ by utilizing an optimization method to minimize error between a calculated indoor air temperature at a time i+1 and a measured indoor air temperature at the time i+1;
• where indoor_tempi+1=α*indoor_tempi+(1−α)*(outdoor_tempi−HVAC_statei*β+solar radiationi*γ)
• where the indoor_tempi+1 is the calculated indoor air temperature for the building at the time i+1,
• the indoor_tempi is an indoor air temperature for the building at a time i,
• the outdoor_tempi is an outdoor air temperature for the building at the time i,
• the HVAC_statei is an operating state of an HVAC system of the building at the time i,
• the solar radiations corresponds to solar radiation on the building at the time i, and
• the time i and the time i+1 are times previous to a current time,
• wherein the optimized thermodynamic variables α, β, and γ correspond to insulation properties of the building, HVAC system properties of the building, and an effect of solar radiation on the building, respectively;
• an air temperature predictor configured to estimate the future indoor air temperature at a plurality of time intervals using the determined thermodynamic properties of the building, the received information about environmental conditions, and the received thermostat set point information;
• wherein the instructions further cause the processor to:
• generate an optimized thermostat set point schedule for at least one thermostat in the building using the future indoor air temperature at the plurality of time intervals;
• and
• based on the future indoor air temperature at the plurality of time intervals, cause load shifting of energy usage by reducing the energy usage of an HVAC system of the building during a peak use event while maintaining a desired indoor air temperature inside of the building by adjusting the thermostat set point schedule to cause the HVAC system to pre-cool the building before the peak use event based on the future indoor air temperature at time intervals prior to a time of the peak use event, and maintaining the desired indoor air temperature inside of the building during the time of the peak use event.