Defrost operation management in heat pumps

Patent metadata

Field	Value
Publication number	US-10018400-B2
Application number	US-201313965543-A
Country	US
Kind code	B2
Filing date	Aug 13, 2013
Priority date	Aug 13, 2013
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

In various implementations, a heat pump may include heating operations and defrost operations. The heat pump may monitor cycle time(s) for one or more of the operations. Defrost operation(s) in the heat pump may be automatically adjusted based at least partially on cycle times.

First claim

The invention claimed is:

1. A method comprising:
initiating one or more operations of a heat pump, wherein the heat pump includes a heating operation and first and second defrost operations;
determining at least one heating operation cycle time associated with at least one heating operation of the heat pump;
determining whether to adjust a termination time of the first defrost operation based at least partially on one or more of the determined heating operation cycle times;
determining whether to adjust a termination temperature of the second defrost operation based at least partially on one or more of the determined heating operation cycle times; and
initiating at least one of the first and second defrost operations;
wherein determining whether to adjust the termination time of the first defrost operation is further based at least partially on comparing a change in temperature over time to a predetermined change in temperature.

2. The method of claim 1 further comprising determining whether to adjust a termination temperature of the first defrost operation.

3. The method of claim 1 wherein the termination temperature of the second defrost or operation comprises a default termination temperature; and further comprising:
receiving a request for alteration of the termination temperature by a user; and
altering the termination temperature based on the received request.

4. The method of claim 1 wherein initiating the at least one of the first and second defrost operations comprises allowing an unaltered defrost operation when a determination is made to not allow an adjustment of the termination time.

5. The method of claim 1 wherein initiating the at least one of the first and second defrost operations comprises allowing an altered defrost operation when a determination is made to allow an adjustment of the termination time.

6. The method of claim 1 wherein determining whether to adjust the termination temperature of the second defrost operation comprises:
comparing at least one of the determined heating operation cycle times to a predetermined cycle time; and
adjusting the termination temperature based on the comparison.

7. The method of claim 1 wherein determining whether to adjust the termination time of the first defrost operation comprises:
comparing at least one of the determined heating operation cycle times to a predetermined cycle time; and
adjusting the termination time when at least one of the determined heating operation cycle times is less than the predetermined cycle time.

8. A method comprising:
initiating one or more operations of a heat pump, wherein the heat pump includes a heating operation and first and second defrost operations;
determining at least one heating operation cycle time associated with at least one heating operation of the heat pump;
determining whether to adjust a termination time of the first defrost operation based at least partially on one or more of the determined heating operation cycle times;
determining whether to adjust a termination temperature of the second defrost operation based at least partially on one or more of the determined heating operation cycle times; and
initiating at least one of the first and second defrost operations;
wherein determining whether to adjust the termination temperature of the second defrost operation comprises:
comparing at least one of the determined heating operation cycle times to a predetermined cycle time; and
adjusting the termination temperature based on the comparison of the at least one of the determined heating cycle times and predetermined cycle time.

9. The method of claim 8 further comprising determining whether to adjust a termination temperature of the first defrost operation.

10. The method of claim 8 wherein the termination temperature of the second defrost operation comprises a default termination temperature, and the method further comprising:
receiving a request for alteration of the termination temperature by a user; and
altering the termination temperature based on the received request.

11. The method of claim 8 wherein initiating the at least one defrost operation comprises allowing an unaltered defrost operation when a determination is made to not allow an adjustment of the termination time.

12. The method of claim 8 wherein initiating the at least one defrost operation comprises allowing an altered defrost operation when a determination is made to allow an adjustment of the termination time.

13. The method of claim 8 wherein determining whether to adjust the termination time of the first defrost operation comprises:
comparing at least one of the determined heating operation cycle times to a predetermined cycle time; and
adjusting the termination time when at least one of the determined heating operation cycle times is less than the predetermined cycle time.

14. A method comprising:
initiating one or more operations of a heat pump, wherein the heat pump includes a heating operation and first and second defrost operations;
determining at least one heating operation cycle time associated with at least one heating operation of the heat pump;
determining whether to adjust a termination time of the first defrost operation based at least partially on one or more of the determined heating operation cycle times;
determining whether to adjust a termination temperature of the second defrost operation based at least partially on one or more of the determined heating operation cycle times; and
initiating at least one of the first and second defrost operation;
wherein determining whether to adjust the termination time of the first defrost operation comprises:
comparing at least one of the determined heating operation cycle times to a predetermined cycle time; and
adjusting the termination time when at least one of the determined heating operation cycle times is less than the predetermined cycle time.

15. The method of claim 14 further comprising determining whether to adjust a termination temperature of the first defrost operation.

16. The method of claim 14 wherein the termination temperature of the second defrost operation comprises a default termination temperature, and the method further comprising:
receiving a request for alteration of the termination temperature by a user; and
altering the termination temperature based on the received request.

17. The method of claim 14 wherein initiating the at least one defrost operation comprises allowing an unaltered defrost operation when a determination is made to not allow an adjustment of the termination time.

18. The method of claim 14 wherein initiating the at least one defrost operation comprises allowing an altered defrost operation when a determination is made to allow an adjustment of the termination time.

Assignees

• Lennox Ind Inc

Inventors

• Qu Yi
• Perkins Bruce
• Olsen Mark

Classifications

• F25B2700/11

  Sensor to detect if defrost is necessary · CPC title

• F25B30/02

  of the compression type · CPC title

• F24F11/43

  of indoor units · CPC title

• F24F11/42

  of outdoor units · CPC title

• F25D21/008

  by timer · CPC title