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Adequate distribution of a two-phase refrigerant flowing through a plurality of heat transfer tubes in a generally parallel manner is ensured. Tapping a portion of predominantly vapor refrigerant from an upstream location and delivering it to a downstream location where separation of liquid and vapo

Adequate distribution of a two-phase refrigerant flowing through a plurality of heat transfer tubes in a generally parallel manner is ensured. Tapping a portion of predominantly vapor refrigerant from an upstream location and delivering it to a downstream location where separation of liquid and vapor refrigerant phases is likely to occur and a liquid refrigerant phase is likely to accumulate. Additional momentum from the predominantly vapor refrigerant creates homogeneous conditions for the vapor/liquid refrigerant mixture, promoting uniform distribution of the mixture In downstream heat transfer tubes. The vapor refrigerant may be tapped from various locations.

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1. A refrigerant system comprising: a compressor, said compressor delivering a compressed refrigerant to a condenser, refrigerant from said condenser passing through an expansion device, and from said expansion device through an evaporator, and from said evaporator being returned to said compressor;

1. A refrigerant system comprising: a compressor, said compressor delivering a compressed refrigerant to a condenser, refrigerant from said condenser passing through an expansion device, and from said expansion device through an evaporator, and from said evaporator being returned to said compressor; andat least one of said condenser and said evaporator having a plurality of heat transfer tubes which pass a refrigerant downstream in a generally parallel manner; and at least one downstream location within said at least one said condenser and said evaporator being likely to receive a separated liquid and vapor phases of refrigerant mixture as the refrigerant flows through the plurality of heat transfer tubes, and a portion of predominantly vapor refrigerant being tapped from an upstream location and delivered to said downstream location to improve distribution of said vapor and liquid refrigerant mixture amongst said plurality of said heat transfer tubes. 2. The refrigerant system as set forth in claim 1, wherein said at least one of said condenser and said evaporator has at least one manifold structure in fluid communication with said plurality of heat transfer tubes, said at least one manifold structure being provided with at least one separation member providing at least two chambers within said at least one manifold structure, and at least one of said manifold chambers being said downstream location. 3. The refrigerant system as set forth in claim 2, wherein said separation member is one of a separation plate, a check valve and a solenoid valve. 4. The refrigerant system as set forth in claim 2, wherein said heat exchanger is the condenser and said upstream location is at least one of a discharge line, an inlet manifold chamber and an upstream intermediate manifold chamber. 5. The refrigerant system as set forth in claim 2, wherein said heat exchanger is the condenser and said downstream location is an intermediate manifold chamber. 6. The refrigerant system as set forth in claim 2, wherein said heat exchanger is the evaporator and said upstream location is at least one of a discharge line, an inlet evaporator manifold chamber, an upstream intermediate evaporator manifold chamber, an inlet condenser manifold chamber, and an intermediate condenser manifold chamber. 7. The refrigerant system as set forth in claim 2, wherein said heat exchanger is the evaporator and said downstream location is at least one of an inlet manifold chamber and an intermediate manifold chamber. 8. The refrigerant system as set forth in claim 1, wherein there are a plurality of taps from a predominantly the same upstream location which deliver said predominantly vapor refrigerant to different downstream locations. 9. The refrigerant system as set forth in claim 1, wherein there are a plurality of taps from different upstream locations which deliver said predominantly vapor refrigerant to a predominantly the same downstream location. 10. The refrigerant system as set forth in claim 1, wherein a valve on a tap line allows said tapped predominantly vapor refrigerant flow to be controlled by pulsing or modulating said valve. 11. The refrigerant system as set forth in claim 10, wherein said pulsation or modulation flow control for said tapped predominantly vapor refrigerant is defined by operating conditions of the refrigerant system. 12. The refrigerant system as set forth in claim 1, wherein said plurality of heat transfer tubes have external corrugated heat transfer fins in heat transfer communication with said heat transfer tubes. 13. The refrigerant system as set forth in claim 1, wherein each of said plurality of heat transfer tubes includes a plurality of small parallel internal channels carrying refrigerant in parallel paths within said heat transfer tubes. 14. The refrigerant system as set forth in claim 13, wherein said parallel internal channels create a microchannel heat transfer tube or a minichannel heat transfer tube. 15. The refrigerant system as set forth in claim 13, wherein said parallel internal channels have at least one of circular, rectangular, trapezoidal or triangular configuration. 16. A refrigerant system comprising: a compressor, said compressor delivering a compressed refrigerant to a condenser, refrigerant from said condenser passing through an expansion device, and from said expansion device through an evaporator, and from said evaporator being returned to said compressor; andat least one of said condenser and said evaporator having a plurality of heat transfer tubes which pass a refrigerant downstream in a generally parallel manner; and at least one downstream location within said at least one said condenser and said evaporator being likely to receive a separated liquid and vapor phases of refrigerant mixture as the refrigerant flows through the plurality of heat transfer tubes, and a control operating such that said refrigerant is pulsed as it passes through said at least one condenser and said evaporator to minimize the separation of liquid and vapor refrigerant phases. 17. The refrigerant system as set forth in claim 16, wherein said refrigerant being pulsed by selectively opening and closing a flow control device located between the said condenser and said evaporator. 18. The refrigerant system as set forth in claim 17 wherein said flow control device is an electronic expansion valve. 19. The refrigerant system as set forth in claim 16, wherein said refrigerant being pulsed by selectively opening and closing a flow control device located between the evaporator and the compressor. 20. The refrigerant system as set forth in claim 19, wherein said flow control device is one of a solenoid valve and a suction modulation valve.