Masterless control system methods for networked water heaters

• US 8,965,584 B2
• Filed: 03/30/2012
• Issued: 02/24/2015
• Est. Priority Date: 02/03/2009
• Status: Active Grant

• Current Assignee: Intellihot Inc.
• Original Assignee: Intellihot Green Technologies, Inc.
• Inventors: Deivasigamani, Sridhar, Akasam, Sivaprasad
• Primary Examiner(s): Kasenge, Charles
• Application Number:
  US13/435,193
• Publication Number:
  US 20120191256A1
• Time in Patent Office: 1,061 Days
• Field of Search: 700/19, 700/20, 700/275, 700/282, 700/300, 122/1.C, 122/13.01, 236/21.B, 237/8.A, 237/19, 126/615
• US Class Current: 700/275
• CPC Class Codes: F24D 17/0026 with conventional heating means F24D17/0036 takes precedence
• CPC Class Codes: F24D 19/1051 for domestic hot water
• CPC Class Codes: F24D 2200/043 More than one gas or oil fired boiler
• CPC Class Codes: F24D 2200/08 Electric heater
• CPC Class Codes: F24H 15/457 using telephone networks or Internet communication
• CPC Class Codes: F24H 15/486 using timers
• CPC Class Codes: G05D 23/1927 using a plurality of sensors G05D23/1902, G05D23/1917, and G05D23/1919 take precedence
• CPC Class Codes: G05D 23/1932 to control the temperature of a plurality of spaces
• CPC Class Codes: Y02B 30/70 Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

Disclosed is a masterless control system for controlling a plurality of fluidly and operably connected water heaters to meet a hot water demand such that overall efficiency is maximized and usage disparity between water heaters is minimized. There is further disclosed a method for detecting a small system demand in said network by adjusting the setting of each flow limiting valve of each water heater. There is still further disclosed a method for enabling seamless addition or removal of a heater in service and heating load distribution to water heaters.

Claims

1. A masterless control method for controlling a plurality of heating devices operably connected in a network to meet a heating demand, wherein each of said plurality of heating devices has a controller which communicates to other heating device controllers within said network via a communication bus and each said controller maintains at least one list of usage planning data, said method comprises steps of:

(a) configuring each said controller to periodically broadcast, at an interval, a message comprising an identification number (ID) and at least one usage planning data item;

(b) configuring each said controller to listen to and receive messages from external controllers on said communication bus; and

(c) configuring each said controller to set a timer upon receiving a message from one of said external controllers, wherein said timer is associated with said one of said external controllers,

wherein if said timer expires, said at least one usage planning data item associated with said one of said external controllers is removed from said at least one list of usage planning data and if the usage planning data associated with said one of said external controllers is received prior to the expiration of said timer, said at least one usage planning data item is retained and said timer is reset and restarted.

2. The masterless control method of claim 1, further comprising:

sorting said at least one list of usage planning data based on a predetermined key to produce a sort result; and

executing a function based on said sort result.

3. The masterless control method of claim 1, wherein said at least one usage planning data item is a parameter selected from the group consisting of a relative remaining life value, a target output temperature, a real-time clock time, a programmed heating device turn-on time and duration, an error code, a value corresponding to a maximum output of each of said plurality of heating devices and combinations thereof.

4. The masterless control method of claim 2, wherein said predetermined key is the ID of each said heating device.

5. The masterless control method of claim 3, wherein said predetermined key is relative remaining life.

6. The masterless control method of claim 1, wherein said plurality of heating devices is selected from the group consisting of water heaters, boilers, thermal driers, air heaters, fluid heaters, solids heaters, combined heat and power systems and combined cooling, heat and power systems.

7. The masterless control method of claim 6, further comprising at least one failsafe measure which requires a shared component of a failed heating device of said plurality of heating devices to continue to operate.

8. The masterless control method of claim 7, wherein said at least one failsafe measure is selected from the group consisting of:

(a) requiring a blower of a failed heating device of said plurality of heating devices to remain in operation for venting flue gas; and

(b) requiring a valve of a failed heating device of said plurality of heating devices to be disposed in a position for meeting said heating demand.

9. A masterless control method for controlling a plurality of heating devices operably connected in a network to meet a heating demand, wherein each of said plurality of heating devices has a controller which communicates to other heating device controllers within said network via a communication bus and each controller maintains at least one list of usage planning data, comprising steps of:

supplying power to said each heating device controller;

configuring the controller of said each heating device to broadcast a message to said communication bus, wherein said message comprises an identification (ID) and at least one usage planning data item;

configuring the controller of said each heating device to listen to and receive messages from other controllers on said communication bus;

reconciling said at least one list of usage planning data by removing expired usage planning data and adding new usage planning data and then sorting said at least one list of usage planning data based on a predetermined key to produce a sort result;

executing a function based on said sort result;

configuring the controller of said each heating device to update usage planning data; and

providing at least one failsafe measure which requires a shared component of a failed heating device of said plurality of heating devices to continue to operate, wherein said at least one failsafe measure is selected from the group consisting of;

(a) requiring a blower of a failed heating device of said plurality of heating devices to remain in operation for venting flue gas; and

(b) requiring a valve of a failed heating device of said plurality of heating devices to be disposed in a position for meeting said heating demand.

10. The masterless control method of claim 9, wherein said at least one usage planning data item is a parameter selected from the group consisting of a relative remaining life value, a target output temperature, a real-time clock time, a programmed heating device turn-on time and duration, an error code, a value corresponding to a maximum output of each of said plurality of heating devices and combinations thereof.

11. The masterless control method of claim 9, wherein said predetermined key is the ID of each said heating device.

12. The masterless control method of claim 10, wherein said predetermined key is relative remaining life.

13. The masterless control method of claim 9, wherein said plurality of heating devices is selected from the group consisting of water heaters, boilers, thermal driers, air heaters, fluid heaters, solids heaters, combined heat and power systems and combined cooling, heat and power systems.

14. A masterless control method for controlling a plurality of water heaters fluidly and operably connected in a network to meet a hot water demand, wherein each of said plurality of water heaters has a controller which communicates to other water heater controllers within said network via a communication bus and each controller maintains at least one list of usage planning data, comprising steps of:

supplying power to said each water heater controller;

configuring the controller of said each water heater to broadcast a message to said communication bus, wherein said message comprises an identification number (ID) and at least one usage planning data item;

configuring the controller of said each water heater to listen to and receive messages from other controllers on said communication bus;

reconciling said list of usage planning data by removing expired usage planning data and adding new usage planning data and then sorting said at least one list of usage planning data based on a predetermined key to produce a sort result;

executing a function based on said sort result;

configuring the controller of said each water heater to update usage planning data; and

providing at least one failsafe measure which requires a shared component of a failed water heater of said plurality of water heaters to continue to operate, wherein said at least one failsafe measure is selected from the group consisting of;

(a) requiring a blower of a failed water heater of said plurality of water heaters to remain in operation for venting flue gas; and

(b) requiring a valve of a failed water heater of said plurality of water heaters to be disposed in a position for meeting said hot water demand.

15. The masterless control method of claim 14, wherein said at least one usage planning data item is a parameter selected from the group consisting of a relative remaining life value, a target output temperature, a real-time clock time, a programmed water heater turn-on time and duration, an error code, a value corresponding to a maximum output of each of said plurality of water heaters and combinations thereof.

16. The masterless control method of claim 14, wherein said predetermined key is a key selected from the group consisting of the ID of each said water heater and relative remaining life.