Managing supplementary heat during defrost on heat pumps

Details Managing supplementary heat during defrost on heat pumps Managing supplementary heat during defrost on heat pumps

1995-07-11

1996-07-09

Ford, John K.

Heat exchange

Regenerator

Checker brick structure

165 12, 165 29, 62160, 237 2B, 219486, F25B 2900

Patent

active

055335683

ABSTRACT:
A method of controlling a current defrost cycle for an outdoor coil of a heat pump system, the heat pump system having a plurality of supplemental heating elements for heating an air stream passing from an indoor coil to an air supply duct during defrost operation, wherein an initial quantity of supplemental heating elements energized is a function of a most recent previous defrost cycle. The initial quantity of supplemental heating elements is energized upon initiation of a defrost cycle. Whether the initial quantity of supplemental heating elements provided is insufficient or excessive is determined. At least one of the supplemental heating elements is deactivated if the initial quantity of supplemental heating elements being provided is excessive. At least one of the supplemental heating elements is activated if the initial quantity of supplemental heating elements being provided is if the initial quantity of supplemental heating elements being provided is insufficient, and at least one additional supplemental heating element is available. Information as to an initial quantity of supplemental heating elements to be activated for a following defrost cycle is retained. The initial quantity of supplemental heating elements to be activated for a following defrost cycle is equal to a number of supplemental heating elements activated upon termination of the current defrost cycle. The heat pump is kept on to complete the defrost cycle during an overshoot condition.

REFERENCES:
patent: 4292813 (1981-10-01), Paddock
patent: 4335847 (1982-06-01), Levine
patent: 4353409 (1982-10-01), Saunders et al.
patent: 4356962 (1982-11-01), Levine
patent: 4725001 (1988-02-01), Carney et al.
patent: 4759498 (1988-07-01), Levine et al.
patent: 5332028 (1994-07-01), Morris

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