System and method for optimizing and reducing the energy usage of an automatically controlled HVAC system

• US 9,582,009 B2
• Filed: 04/26/2013
• Issued: 02/28/2017
• Est. Priority Date: 04/30/2012
• Status: Expired due to Fees

• Current Assignee: Smrten, LLC
• Original Assignee: Smrten, LLC
• Inventors: Shahapurkar, Som, Pratap, Rana J.
• Primary Examiner(s): Karim, Ziaul
• Application Number:
  US13/871,168
• Publication Number:
  US 20130238144A1
• Time in Patent Office: 1,404 Days
• Field of Search: 700278-293
• US Class Current: 1/1
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/46 Improving electric energy efficiency or saving
• CPC Class Codes: F24F 11/47 Responding to energy costs
• CPC Class Codes: F24F 11/62 characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
• CPC Class Codes: F24F 11/64 using pre-stored data
• CPC Class Codes: F24F 2140/60 Energy consumption
• 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

Abstract

System and method for optimizing and reducing the energy usage of an automatically controlled heating, ventilation and air conditioning (“HVAC”) System. The system and method comprise receiving, from a server, a plurality of parameters, the parameters comprising an internal temperature of a structure, an external temperature, a utility pricing structure, and/or a user preference. The system and method may receive, by the server, a plurality of historical data related to the HVAC system and may generate a model. The model may be configured to determine a change to an operational state of the HVAC system needed to obtain an internal temperature set point. The model may be generated using a plurality of parameters received. The model may be revised iteratively. The system and method may receive, by the server, a plurality of additional parameters to revise the model. A signal may be set, by a server, to the HVAC system.

Claims

1. A method for optimizing and reducing the energy usage or cost of operation of an automatically controlled heating, ventilation and air conditioning (“

HVAC”

) system, comprising;

receiving, by a server, a plurality of parameters, the parameters comprising;

an internal temperature of a structure;

an external temperature;

a utility pricing structure; and

an user preference;

receiving, by the server, a plurality of historical data related to the HVAC system;

generating, by the server, a model configured to determine a change to an operational state of the HVAC system needed to obtain an internal temperature set point, wherein the model is further configured to be generated using a plurality of model parameters comprising;

the internal and external temperatures of the structure;

the utility pricing structure;

the user preference;

future weather forecast of a geographic area to be served; and

the plurality of historical data related to the HVAC system;

iteratively processing and updating the model, by the server, using a result of a previously generated model, current data for the plurality of parameters and a plurality of additional parameters, wherein the additional parameters comprise a future utility pricing structure; and

a future user preference;

creating initial set point sets, wherein each set point set comprises set point values for a predetermined number of hours;

calculating hourly system runtime for each set point set by using the generated model;

calculating a cost for each set point set based on the calculated hourly system runtime;

ranking the set point sets by the calculated cost;

determining if the costs for each of the set point sets vary by more than a pre-determined amount;

when the costs for each of the set point sets vary by more than the pre-determined amount, creating new set point sets and then returning to the calculating hourly system runtime for each set point set step;

when the costs for each of the set point sets vary by not more than the pre-determined amount, selecting the set point set with the lowest cost; and

sending, by the server, a signal to the HVAC system, the signal configured to affect a current operational state of the HVAC system, wherein the signal is the selected set point set.

2. The method of claim 1, wherein the internal temperature is received from a plurality of HVAC systems within a single structure.

3. The method of claim 1, wherein the external temperature is configured to be determined by a plurality of external temperature parameters, comprising at least one of:

an external temperature;

a humidity rating; and

a cloud coverage rating.

4. The method of claim 1, wherein the user preference comprises at least one of:

a comfort and tolerance level;

a time of day setting; and

an activity setting.

5. The method of claim 1, wherein the historical data related to the HVAC system comprises at least one of:

historical internal and external temperatures;

historical weather conditions;

historical user preferences; and

historical utility pricing structures.

6. The method of claim 1, wherein the utility pricing is received from a plurality of sources comprising at least one of:

a utility company;

a website; and

an user input.

7. The method of claim 1, wherein the external temperature and future weather conditions are configured to be received from a plurality of sources, comprising at least one of:

a weather station;

a website; and

an utility company.

8. The method of claim 1, wherein the current operational state of the HVAC comprises:

an ON state;

an OFF state; and

a MAINTAIN state wherein the current operational state of the HVAC remains unchanged.

9. The method of claim 1, wherein the signal to the HVAC system is an optimized set point, the set point parameters being computed using a genetic algorithm.

10. The method of claim 1, further comprising the steps of:

pre-cooling the structure to a temperature between a high and low temperature limit during a period of a low energy cost and a high forecasted external temperature;

obviating cooling of the structure by the HVAC system if a forecasted weather condition will cool the structure; and

pre-heating the structure to a temperature between a high and a low temperature limit during a period of a low energy cost and a low forecasted external temperature.

11. A method for optimizing and reducing the energy usage or cost of operation of an automatically controlled heating, ventilation and air conditioning (“

HVAC”

) system, comprising;

receiving, by a server, a plurality of parameters, the parameters comprising;

an internal temperature of a structure;

an external temperature;

an utility pricing structure; and

an user preference;

receiving, by the server, a plurality of historical data related to the HVAC system;

generating, by the server using the received parameters and historical data, a model configured to determine a change to an operational state of the HVAC system needed to obtain an internal temperature set point;

creating initial set point sets, wherein each set point set comprises set point values for a predetermined number of hours;

calculating hourly system runtime for each set point set by using the generated model;

calculating a cost for each set point set based on the calculated hourly system runtime;

ranking the set point sets by the calculated cost;

determining if the costs for each of the set point sets vary by more than a pre-determined amount;

when the costs for each of the set point sets vary by more than the pre-determined amount, creating new set point sets and then returning to the calculating hourly system runtime for each set point set step;

when the costs for each of the set point sets vary by not more than the pre-determined amount, selecting the set point set with the lowest cost; and

sending, by the server, a signal to the HVAC system, the signal configured to affect a current operational state of the HVAC system, wherein the signal is the selected set point set.

12. A system of processor-executable instructions that when executed by a server, optimize and reduce the energy usage or cost of operation of an automatically controlled heating, ventilation and air conditioning (“

HVAC”

) system by instructing the server to;

receive a plurality of parameters, the parameters comprising;

an internal temperature of a structure;

an external temperature;

an utility pricing structure; and

an user preference comprising a comfort level, a tolerance level, and a time of day setting;

generate a model configured to determine a change to an operational state of the HVAC system needed to obtain an internal temperature set point, wherein the model is further configured to be generated using a plurality of model parameters comprising;

the internal and external temperatures of the structure;

the utility pricing structure;

the user preference;

future weather forecast of a geographic area to be served; and

the plurality of historical data related to the HVAC system;

create initial set point sets, wherein each set point set comprises set point values for a predetermined number of hours;

calculate hourly system runtime for each set point set by using the generated model;

calculate a cost for each set point set based on the calculated hourly system runtime;

rank the set point sets by the calculated cost;

determine if the costs for each of the set point sets vary by more than a pre-determined amount;

when the costs for each of the set point sets vary by more than the pre-determined amount, create new set point sets and then return to the calculating hourly system runtime for each set point set step;

when the costs for each of the set point sets vary by not more than the pre-determined amount, select the set point set with the lowest cost; and

and

send a signal to the HVAC system, the signal configured to affect a current operational state of the HVAC system, wherein the signal is the selected set point set.

13. The system of claim 12, wherein the external temperature is configured to be determined by a plurality of external temperature parameters, comprising at least one of:

an external temperature;

a humidity rating; and

a cloud coverage rating.

14. The system of claim 12, wherein the historical data related to the HVAC system comprises:

historical internal and external temperatures;

historical weather conditions;

historical user preferences; and

historical utility pricing structures.

15. The system of claim 12, wherein the additional parameters comprise at least one of:

a future utility pricing structure; and

a future user preference.

16. The system of claim 12, wherein the utility pricing is received from a plurality of sources comprising at least one of:

a utility company;

a website; and

an user input.

17. The system of claim 12, wherein the external temperature and future weather conditions are configured to be received from a plurality of sources, comprising at least one of:

a weather station;

a website; and

an utility company.

18. The system of claim 12, wherein the current operational state of the HVAC comprises:

an ON state;

an OFF state; and

a MAINTAIN state wherein the current operational state of the HVAC remains unchanged.

19. The system of claim 12, wherein the signal to the HVAC system is an optimized set point, the set point parameters being computed using a genetic algorithm.

20. The system of claim 12, wherein the system saves energy by pre-cooling the structure to a temperature between a high and low temperature limit during a period of a low energy cost and a high forecasted external temperature;

and during a second period not maintaining a cool comfort level temperature if a forecasted weather condition will cool the structure, and wherein the system further saves energy by pre-heating the structure to a temperature between a high and a low temperature limit during a period of a low energy cost and a low forecasted external temperature.