System for obtaining and classifying energy characteristics

• US 10,204,182 B2
• Filed: 03/31/2014
• Issued: 02/12/2019
• Est. Priority Date: 04/01/2013
• Status: Active Grant

• Current Assignee: Ademco Inc. (Resideo Technologies, Inc.)
• Original Assignee: Ademco Inc. (Resideo Technologies, Inc.)
• Inventors: Parthasarathy, Girija, Foslien, Wendy, Davalos, Pedro
• Primary Examiner(s): Ochoa, Juan C
• Application Number:
  US14/231,474
• Publication Number:
  US 20140297238A1
• Time in Patent Office: 1,779 Days
• Field of Search: 703 1, 703 2, 703 5
• CPC Class Codes: G06F 30/13 Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads

Abstract

An approach and system for receiving data from a thermostat in a building, treating the data as representative of a thermal response model or system, and determining a relationship between a rate of building internal temperature change and change in outdoor temperature to provide an indication of how well a building is insulated versus a thermal mass of the building.

Claims

1. A demand response system for classifying characteristics of buildings and controlling thermostats, the system comprising:

a computer; and

one or more thermostats situated in one or more buildings, respectively, and having a connection to the computer; and

wherein;

each of the one or more thermostats provides time series data to the computer;

the time series data comprise indoor temperature, outdoor temperature, and temperature setpoints relative to time;

a thermal response model for each of the one or more buildings is derived from the time series data;

a connection includes one or more intermediary connections; and

the one or more intermediary connections are wired, wireless, or wired and wireless,

a relationship between thermal mass and heat loss characteristics of a building defines a time constant for a building and the time constant of a building is represented by (mc_p/UA)=((T_oa−

T_in)/(dT/dt)), wherein;

mc_p represents thermal mass of the building;

UA represents heat transfer or loss from the building per degree of temperature;

T_oa represents temperature outside of the building;

T_in represents temperature inside of the building; and

(dT/dt) represents a rate of change of temperature inside of the building; and

a demand response control signal is provided from the computer to at least one thermostat of the one or more thermostats to adjust the operation of the at least one thermostat, the demand response control signal is customized to adjust operation of the at least one thermostat based on the relationship between the thermal mass and heat loss characteristic of a building of the one or more buildings in which the at least one thermostat is situated.

2. The system of claim 1, wherein the thermal response model approximates thermal mass with respect to the heat loss characteristics for a building.

3. The system of claim 1, wherein the time constant of a building is estimated from correlating a rate of temperature change in the building with a difference between the outdoor temperature and the indoor temperature of the building.

4. The system of claim 3, further comprising classifying buildings according to time constants of the respective buildings.

5. The system of claim 3, wherein:

the time constant of a building is refined with additional data; and

the additional data comprises one or more items from a group consisting of heating source specifications, cooling source specifications, building insulation information, building size, and surface areas relevant to the building.

6. The system of claim 1, wherein the one or more thermostats are connected to the computer via a communications network.

7. The system of claim 6, wherein the communications network comprises access to one or more items selected from a group consisting of processing, memory, application servers, sensors, databases, specifications for the one or more buildings, specifications of thermostats, receipt and storage of time-series data from the one or more thermostats, and derivation of the thermal response model for each of the one or more buildings from the time-series data.

8. The system of claim 1, wherein:

the one or more thermostats are connectable or connected to a network;

the one or more thermostats are viewable and operable by a smart device via the network; and

the one or more thermostats are connectable to the network via a wire or wireless medium or media, or the one or more thermostats are controllable by the smart device via a wire or wireless medium or media.

9. A demand response method for classifying buildings and controlling thermostats, the method comprising:

obtaining time series data from one or more thermostats in one or more buildings;

creating a thermal response model of a building from the time series data;

extracting parameters from the thermal response model;

classifying the one or more buildings as groups with respect to the parameters and weather conditions external to the one or more buildings,

deriving a time constant for each of the one or more buildings from a relationship of insulation information and thermal mass of each of the one or more buildings, respectively;

sending a demand response control signal to at least one thermostat of the one or more thermostats to adjust operation of the at least one thermostat, the demand response control signal is customized to adjust operation of the at least one thermostat based on the derived time constant of a building of the one or more buildings in which the at least one thermostat is situated; and

wherein;

the parameters include one or more of specific heat capacity, mass heat transfer coefficient, and internal heating/cooling source information;

the time series data includes one or more of indoor temperature relative to time, outdoor temperature relative to time, and temperature setpoints relative to time; and

the time constant of a building is represented by

(mc_p/UA)=((T_oa−

T_in)/(dT/dt)), wherein;

mc_p represents thermal mass of the building;

UA represents heat transfer or loss from the building per degree of temperature;

T_oa represents temperature outside of the building;

T_in represents temperature inside of the building; and

(dT/dt) represents a rate of change of temperature inside of the building.

10. The method of claim 9, wherein the one or more thermostats are connectable or connected to a communications network.

11. The method of claim 10, further comprising:

providing a computer connectable or connected to the communications network; and

wherein the computer provides processing to obtain the time series data from the one or more thermostats, create the thermal response model of a building from the time series data, extract parameters from the thermal response model, or classify the one or more buildings with respect to the parameters.

12. The method of claim 10, further:

comprising providing a computer connectable or connected to the communications network; and

wherein the computer is operated to have the time series data from the one or more thermostats to be put in a storage connected to the communications network, to create a thermal response model of a building by a processor connected to the communications network, to extract parameters from the thermal response model by a processor connected to the communications network, or to classify the one or more buildings with respect to the parameters by a processor connected to the communications network.

13. A demand response mechanism for determining energy characteristics and controlling thermostats, the mechanism comprising:

one or more thermostats situated inside one or more buildings, respectively; and

a computer connected to the one or more thermostats; and

wherein;

the one or more thermostats provide time-series data to the computer;

the time-series data comprise one or more items selected from a group consisting of indoor temperatures, indoor humidity, temperature setpoints, outdoor temperatures, outdoor humidity, heating mode, and cooling mode;

a time constant is determined for at least one of the one or more buildings, the time constant of a building is represented by (mc_p/UA)=((T_oa−

T_in)/(dT/dt)), wherein;

mc_p represents thermal mass of the building;

UA represents heat transfer or loss from the building per degree of temperature;

T_oa represents temperature outside of the building;

T_in represents temperature inside of the building; and

(dT/dt) represents a rate of change of temperature inside of the building; and

a demand response control signal is provided from the computer to at least one thermostat of the one or more thermostats to adjust operation of the at least one thermostat, the demand response control signal is customized to adjust operation of the at least one thermostat based on the time constant of a building of the one or more buildings in which the at least one thermostat is situated.

14. The mechanism of claim 13, wherein the time series data is recorded asynchronously.

15. The mechanism of claim 13, wherein:

a thermal response model of each of the one or more buildings is developed from the time series data; and

one or more parameters related to thermal capacity and energy efficiency, determined together for each of the one or more buildings, are extracted from the respective thermal response model.

16. The mechanism of claim 15, wherein the one or more parameters are selected from a group consisting of building insulation information, building size, surface areas, information about a heating source and information about a cooling source.

17. The mechanism of claim 13, wherein:

the rate of temperature change inside a building and a difference between indoor temperature and outdoor temperature of each of the one or more buildings indicate insulation information respectively for each of the one or more buildings;

a thermal mass is obtained for each of the one or more buildings; and

the time constant is determined for each of the one or more buildings from the insulation information and the thermal mass of each of the one or more buildings.

18. The mechanism of claim 13, wherein the time constant is used for one or more items of a group consisting of classifying buildings, identifying patterns of buildings resembling particular geographical locations, identifying patterns of buildings indicating particular types of buildings, detecting patterns resembling anomalous energy performance of a building, and identifying patterns that indicate degradation of energy performance of a building over time.