| 摘要 |
A heat pump refrigeration system for refrigerating a compartment includes a first heat exchanger mounted outside the compartment, a second heat exchanger mounted inside the compartment and coupled to the first heat exchanger, and a compressor. A refrigerator conduit is coupled between the first and second heat exchangers, and between the compressor and the first and second heat exchangers, to transport refrigerant. A valve mechanism is coupled between the compressor and first and second heat exchangers. A cycle control mechanism switches the valve mechanism between two positions, one of which enables refrigerant to flow to the first and second heat exchangers in one direction and the other position enables refrigerant to flow in the opposite direction. Bypass conduits are coupled to the first and second heat exchangers to pass at least a portion of the refrigerant around the heat exchangers. A temperature control mechanism measures the temperature of the refrigerant discharged from the compressor during the refrigerating and defrost cycles to at least partially open the bypass conduits when the temperature of the discharged refrigerant exceeds at least one predetermined temperature.
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