Load reduction based on percentage change in energy price

• US 8,738,186 B2
• Filed: 10/08/2012
• Issued: 05/27/2014
• 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 S., Evans, Edward B.
• Primary Examiner(s): JARRETT, RYAN A
• Application Number:
  US13/647,216
• Publication Number:
  US 20130030576A1
• Time in Patent Office: 596 Days
• Field of Search: None
• US Class Current: 700/276
• CPC Class Codes: G05D 23/19 characterised by the use of electric means G05D23/1393 takes precedence
• CPC Class Codes: G05D 23/1923 using thermal energy, the cost of which varies in function of time
• CPC Class Codes: G06Q 50/06 Energy or water supply

Abstract

A thermostatic controller is configured for curtailing load when energy price rate is high. One or more energy price rates received by a receiver device are stored in an electronic memory. A microprocessor is operable to select from the one or more energy price rates the lowest energy price rate received within a given time period for establishing a base energy price rate. The microprocessor is 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 or multiplier factor of the base energy price rate. In response to an energy price rate that exceeds the base energy price rate by more than the first percentage or multiplier factor, the microprocessor is configured to select a first temperature offset corresponding to the first percentage or multiplier factor and change the set point temperature by the first temperature offset.

Claims

1. A thermostatic controller for curtailing load of one or more energy consuming appliances when energy price rate is high, the thermostatic controller 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, the microprocessor configured to control operation of an energy consuming appliance to maintain a set point temperature, the microprocessor including a memory encoded with an instruction operable to select from the 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 or multiplier factor 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 or multiplier factor by selecting a first temperature offset corresponding to the first percentage or multiplier factor and changing the set point temperature by the first temperature offset.

2. The thermostatic controller of claim 1, wherein the microprocessor 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 thermostatic controller of claim 1, wherein the first percentage or multiplier factor is a user-selectable percentage that is selectable as a value of at least 20 percent or a user-selectable multiplier factor that is selectable as a value of at least 1.5.

4. The thermostatic controller 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 changed set point temperature reduces energy consumption when an energy price rate is significantly higher than the base energy price rate.

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

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

7. The thermostatic controller of claim 6, wherein the display device is further configured to display the first percentage or multiplier factor 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 or multiplier factor.

8. The thermostatic controller of claim 1, wherein:

the memory of the microprocessor 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 percentage or multiplier factor; and

the microprocessor is configured to responsively select a second temperature offset and adjust the set point temperature by the second temperature offset.

9. The thermostatic controller of claim 8, wherein:

the second percentage or multiplier factor is a user-selectable percentage that is a value of at least 50 percent or a user-selectable multiplier factor of at least 1.5; 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 thermostatic controller of claim 1, wherein the receiver device is configured to receive a wireless signal including the energy price rate information that is transmitted by a utility meter.

11. The thermostatic controller 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 or multiplier factor by transmitting an off command via the transceiver to an energy consuming appliance.

12. The thermostatic controller 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 or multiplier factor by transmitting a signal via the transceiver to an energy consuming appliance indicating that the energy consuming appliance should be in an off state.

13. The thermostatic controller of claim 12, wherein the microprocessor is configured to respond to an energy price rate that is below the base energy price rate by more than the first percentage or multiplier factor by transmitting a signal via the transceiver to an energy consuming appliance indicating that the energy consuming appliance should be in an on state.

14. The thermostatic controller of claim 1, wherein the thermostatic controller comprises:

a thermostat for controlling operation of one or more energy consuming appliances of a heating ventilation and air-conditioning (HVAC) system; and

/or

a control for a water heater; and

/or

a control for a pool water heater; and

/or

a control for a spa water heater; and

/or

a control for a ceiling fan.

15. The thermostatic controller of claim 1, wherein:

the thermostatic controller comprises a control for a water heater;

the microprocessor is configured to control operation of the water heater to maintain a set point temperature of water heated by the water heater; 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 or multiplier factor by selecting a first temperature offset corresponding to the first percentage or multiplier factor and decreasing the set point temperature by the first temperature offset.

16. The thermostatic controller of claim 1, wherein the thermostatic controller includes a connection with a contactor by which the thermostatic controller can switch on and off to connect or disconnect a supply of power to the energy consuming appliance, to thereby control operation of the energy consuming appliance.

17. A method of using a thermostatic controller to curtail load when energy price rate is high, the method comprising:

receiving a signal that includes an energy price rate for a given time period;

storing one or more energy price rates in an electronic memory;

selecting a lowest energy price rate received within a given period of time from the one or more energy price rates stored in the electronic memory by using a microprocessor in communication with the electronic memory, 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 or multiplier factor of the base energy price rate; and

responding to an energy price rate that exceeds the base energy price rate by more than the first percentage or multiplier factor by selecting, using the microprocessor, a first temperature offset corresponding to the first percentage or multiplier factor and adjusting a set point temperature of an energy consuming appliance by the first temperature offset to thereby reduce energy consumption.

18. The method of claim 17, wherein the energy consuming appliance comprises a water heater, and the method includes using the microprocessor to decrease the set point temperature of the water heater by the first temperature offset to thereby reduce energy consumption.