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US 6,318,095 B1Granted
Method and system for demand defrost control on reversible heat pumps
AssigneeCarrier Corporation
InventorsCharles Z. Guo, Raymond A. Rust, Jr.
Life of this patent
Estimating the term…
Abstract
A control processor controls an outdoor coil defrost cycle on a reversible heat pump by continuously monitoring the difference between the outdoor coil temperature and the outdoor air temperature. When specified preconditions are met and this difference exceeds a target value, the defrost cycle is initiated.
Claims12
A method for controlling a coil defrosting cycle in a reversible heat pump system using a refrigerant cycle, comprising the steps of:
- monitoring an outdoor coil temperature of an outdoor coil of said heat pump system;
- monitoring an outdoor air temperature in a vicinity of said outdoor coil;
- determining a maximum allowable difference between said outdoor air temperature and said outdoor coil temperature;
- and
- defrosting said coil when a dynamically determined difference between said outdoor air temperature and said outdoor coil temperature exceeds said maximum allowable difference for a predetermined amount of time and predetermined conditions of said system are met.
2 more elements
A system for controlling a coil defrosting cycle in a reversible heat pump system using a refrigerant cycle, comprising:
- means for monitoring an outdoor coil temperature of an outdoor coil of said heat pump system;
- means for monitoring an outdoor air temperature in a vicinity of said outdoor coil;
- means for determining a maximum allowable difference between said outdoor air temperature and said outdoor coil temperature;
- and
- means for defrosting said coil when a dynamically determined difference between said outdoor air temperature and said outdoor coil temperature exceeds said maximum allowable difference for a predetermined amount of time and predetermined conditions of said system are met.
2 more elements
Dependencies are inferred from the claim text.