Thermostat load reduction based on percentage change in energy price

• US 8,285,419 B2
• Filed: 04/23/2010
• Issued: 10/09/2012
• Est. Priority Date: 04/23/2010
• Status: Active Grant

• Current Assignee: Copeland Comfort Control LP (Emerson Electric Company)
• Original Assignee: Emerson Electric Company
• Inventors: Drew, David
• Primary Examiner(s): JARRETT, RYAN A
• Application Number:
  US12/766,155
• Publication Number:
  US 20110264290A1
• Time in Patent Office: 900 Days
• Field of Search: 700/276, 700/277, 700/278, 700/291, 700/295, 700/296, 700/299, 700/300
• US Class Current: 700/276
• CPC Class Codes: G05D 23/1923 using thermal energy, the cost of which varies in function of time
• CPC Class Codes: Y02B 70/3225 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving

Abstract

A thermostat capable of receiving signals transmitted by a utility provider communicating a usage rate schedule or a request for a load curtailment period, and controlling one or more systems based on the information communicated by the utility. The thermostat changes the set point for each system to the stored predetermined control set point corresponding to the current usage rate schedule period or the curtailment mode period when requested. The thermostat is further capable of discontinuing operation of one or more systems for a minimum predetermined time period following a request for a load curtailment period.

Claims

1. A thermostat for curtailing air conditioner load when energy price rate is high, comprising:

a receiver device configured to receive a signal that includes an energy price rate for a given time period;

an electronic memory device in which one or more energy price rates received by the receiver device are stored; and

a microprocessor in communication with the receiver device and electronic memory, and configured to control operation of an air conditioner system to maintain a set point temperature for a space, the microprocessor including a memory encoded with an instruction operable to select from said one or more energy price rates the lowest energy price rate received within a given time period for establishing a base energy price rate, and further encoded with an instruction operable to determine if the energy price rate for a present time period exceeds the base energy price rate by more than a first percentage of the base energy price rate,

wherein the microprocessor is configured to respond to an energy price rate that exceeds the base energy price rate by more than the first percentage by selecting a first temperature offset corresponding to the first percentage and increasing the set point temperature by the first temperature offset.

2. The thermostat of claim 1, wherein the instruction is operable to select the lowest energy price rate received within a 24 hour period, which lowest energy price rate is utilized to establish the base energy price rate.

3. The thermostat of claim 1, wherein the first percentage is a user-selectable percentage that is selectable as a value of at least 20 percent.

4. The thermostat of claim 1, wherein the first temperature offset is a user-selectable temperature offset selectable from a range of between 1 degree Fahrenheit to 20 degrees Fahrenheit;

and/or whereby the increased set point temperature reduces air conditioner energy consumption when an energy price rate is significantly higher than the base energy price rate.

5. The thermostat of claim 1, further comprising a display device that is configured to display user-selectable fields for input of the user-selectable percentage and corresponding user-selectable temperature offset, to enable a user to select a threshold as a percentage of the base energy price rate at which the user desires the set point temperature to be incremented by the first temperature offset for reducing energy consumption to lower energy costs.

6. The thermostat of claim 1, further comprising a display device configured to display the first percentage, to provide for display of an easily discernable cost impact associated with an energy price rate that exceeds the base energy price rate by more than the first percentage.

7. The thermostat of claim 6, wherein the display device is further configured to display the first percentage and a user-selectable field for aiding the user in selecting the first temperature offset for reducing energy costs when an energy price rate exceeds the base energy price rate by the first percentage.

8. The thermostat of claim 1, wherein the microprocessor'"'"'s memory comprises a read-only-memory that is further encoded with an instruction operable to determine if the energy price rate for the present time period exceeds the base energy price rate by more than a second predetermined percentage, wherein the microprocessor is configured to responsively select a second temperature offset and increment the set point temperature by the second temperature offset.

9. The thermostat of claim 8, wherein the second percentage is a user-selectable percentage that is a value of at least 50 percent, and the second temperature offset is a user-selectable temperature offset selectable from a range of between 2 degrees Fahrenheit to 20 degrees Fahrenheit.

10. The thermostat of claim 1, wherein the receiver device receives a short-range wireless signal including the energy price rate information that is transmitted by a utility meter that is outside of the space.

11. The thermostat of claim 1, wherein the receiver device comprises a transceiver configured to receive and transmit signals, and the microprocessor is configured to respond to an energy price rate that exceeds the base energy price rate by more than the first percentage by transmitting an off command via the transceiver to an energy consuming appliance, to thereby reduce energy costs.

12. A thermostat for curtailing air conditioner load when energy price rate is high, comprising:

a receiver device configured to receive a signal wirelessly transmitted by a utility meter that includes an energy price rate for a given time period;

an electronic memory device in which one or more energy price rates received by the receiver device are stored; and

a microprocessor in communication with the receiver device and the electronic memory, and configured to control operation of an air conditioner system to maintain a set point temperature for a space, the microprocessor including a memory encoded with an instruction operable to select from said one or more energy price rates the lowest energy price rate received within a 24 hour period for establishing a base energy price rate, and further encoded with an instruction operable to determine if the energy price rate for a present time period exceeds the base energy price rate by more than a first percentage of the base energy price rate,

wherein the microprocessor is configured to respond to an energy price rate that exceeds the base energy price rate by more than the first percentage by selecting a first temperature offset corresponding to the first percentage and increasing the set point temperature by the first temperature offset; and

a display device configured to display the first temperature offset, and to display the first percentage to provide an easily discernable cost impact associated with an energy price rate that exceeds the base energy price rate by more than the first percentage so that the user would be able to determine how an override of the temperature offset to the set point temperature would affect the user'"'"'s energy costs.

13. The thermostat of claim 12, wherein the first percentage is a user-selectable percentage that is selectable as a value of at least 20 percent.

14. The thermostat of claim 12, wherein the first temperature offset is a user-selectable temperature offset selectable from a range of between 1 degree Fahrenheit to 20 degrees Fahrenheit;

and/or whereby the offset set point temperature reduces air conditioner energy consumption when an energy price rate is significantly higher than the base energy price rate.

15. The thermostat of claim 12, wherein the display device is configured to display user-selectable fields for input of the user-selectable percentage and corresponding user-selectable temperature offset, to enable a user to select a threshold as a percentage of the base energy price rate;

and/or whereby the display of the first percentage provides an easily discernable cost impact that would cause the user to be less likely to override the temperature offset to the set point temperature.

16. The thermostat of claim 12, wherein the microprocessor'"'"'s memory comprises a read-only-memory that is further encoded with an instruction operable to determine if the energy price rate for the present time period exceeds the base energy price rate by more than a second predetermined percentage, wherein the microprocessor is configured to responsively select a second temperature offset and increment the set point temperature by the second temperature offset.

17. The thermostat of claim 16, wherein the second percentage is a user-selectable percentage that is selectable as a value of at least 50 percent, and the second temperature offset is a user-selectable temperature offset selectable from a range of between 2 degrees Fahrenheit to 20 degrees Fahrenheit.

18. The thermostat of claim 12, wherein the receiver device comprises a transceiver configured to receive and transmit signals, and the microprocessor is configured to respond to an energy price rate that exceeds the base energy price rate by more than the first percentage by transmitting an off command via the transceiver to an energy consuming appliance, to thereby reduce energy costs.

19. The thermostat of claim 12, wherein the receiver device receives a short-range wireless signal including the energy price rate information that is transmitted by a utility meter that is outside of the space.

20. A method of using a thermostat to curtail an air conditioner load when energy price rate is high, the method comprising:

receiving a signal wirelessly transmitted by a utility meter that includes an energy price rate for a given time period;

storing one or more energy price rates received by the receiver device in an electronic memory;

selecting from said one or more energy price rates, using a microprocessor in communication with the electronic memory, the lowest energy price rate received within a 24 hour period for establishing a base energy price rate;

determining, using the microprocessor, if the energy price rate for a present time period exceeds the base energy price rate by more than a first percentage of the base energy price rate,

responding to an energy price rate that exceeds the base energy price rate by more than the first percentage by selecting, using the microprocessor, a first temperature offset corresponding to the first percentage and increasing a set point temperature by the first temperature offset to thereby reduce air conditioner energy consumption; and

displaying on a display device the first percentage to provide an easily discernable cost impact associated with an energy price rate that exceeds the base energy price rate by more than the first percentage so that the user would be able to determine how an override of the temperature offset to the set point temperature would affect the user'"'"'s energy costs.