Defrost control using fan data
First Claim
Patent Images
1. A method of distinguishing between a frost condition and a nonfrost condition in a vapor compression system, the method comprising:
- determining a change in a fan property;
determining a time period in which the change in the fan property occurred;
determining if an event has occurred based at least partially on the change in the fan property and the time period;
determining that the event is a frost condition if the time period is within a predetermined frost period of time;
determining that the event is a slow nonfrost condition if the time period is greater than a predetermined slow amount of time;
determining that the event is a sudden nonfrost condition if the time period is less than a predetermined sudden amount of time; and
initiating a defrost cycle if the event is a frost condition.
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Abstract
In various implementations, frost in a vapor compression system may be controlled. A property of a fan may be determined. A determination may be made whether a frost event and/or a nonfrost event has occurred based at least partially on the determined fan property.
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Citations
14 Claims
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1. A method of distinguishing between a frost condition and a nonfrost condition in a vapor compression system, the method comprising:
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determining a change in a fan property; determining a time period in which the change in the fan property occurred; determining if an event has occurred based at least partially on the change in the fan property and the time period; determining that the event is a frost condition if the time period is within a predetermined frost period of time; determining that the event is a slow nonfrost condition if the time period is greater than a predetermined slow amount of time; determining that the event is a sudden nonfrost condition if the time period is less than a predetermined sudden amount of time; and initiating a defrost cycle if the event is a frost condition. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A vapor compression system comprising:
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a fan; sensors that measure one or more system properties, the one or more system properties comprising at least a change in a fan property and a time period in which the change occurred; and a controller that determines if an event has occurred and whether the event is a frost condition, slow nonfrost condition, or a sudden nonfrost condition based at least in part upon the change in the fan property and the time period, wherein the controller is configured to; determine that the event is a frost condition if the time period is within a predetermined frost period of time; determine that the event is a slow nonfrost condition if the time period is greater than a predetermined slow amount of time; determine that the event is a sudden nonfrost condition if the time period is less than a predetermined sudden amount of time; and initiate a defrost cycle if the event is a frost condition. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification