Refrigeration system with full oil recovery

1. A refrigeration system with full oil recovery for removing oil from a flow of a refrigerant, comprising:

a compressor;

an oil separator positioned downstream of the compressor to remove most of the oil from the flow of the refrigerant;

a condenser positioned downstream of the oil separator; and

a receiver positioned downstream of the condenser;

the receiver comprising a barrier to separate the oil on a first side of the barrier from the refrigerant on a second side of the barrier;

wherein the receiver comprises a condenser output tube in communication with the condenser, the condenser output tube comprising a curvilinear discharge end, wherein an outlet of the curvilinear discharge end is:

oriented in a direction substantially parallel to the barrier; and

adapted to be submerged in a flow of liquid refrigerant within the receiver.

2. The refrigeration system of claim 1 , wherein the refrigeration system comprises a cascade refrigeration system.

3. The refrigeration system of claim 1 , wherein the refrigerant comprises an ammonia refrigerant or any refrigerant that is immiscible with the oil.

4. The refrigeration system of claim 1 , wherein condenser comprises a high side condenser and the compressor comprises a high side compressor.

5. The refrigeration system of claim 1 , wherein the oil separator comprises a coalescing oil separator.

6. The refrigeration system of claim 1 , wherein the receiver comprises a turbulence isolation plate positioned adjacent to the condenser output tube.

7. The refrigeration system of claim 6 , wherein the turbulence isolation plate comprises a plurality of perforations.

8. The refrigeration system of claim 1 , wherein the barrier separates a first side and a second side of the receiver.

9. The refrigeration system of claim 8 , wherein the barrier comprises a weir plate.

10. The refrigeration system of claim 8 , wherein the first side comprises a first oil pot.

11. The refrigeration system of claim 8 , wherein the second side comprises a second oil pot.

12. The refrigeration system of claim 8 , wherein the second side comprises a refrigerant supply port.

13. A method of removing oil from a flow of refrigerant in a refrigeration system, comprising:

removing most of the oil in an oil separator;

condensing the refrigerant in a condenser;

flowing the refrigerant to a receiver;

separating the remaining oil in the refrigerant on one side of a barrier in the receiver; and

accumulating the remaining oil in an oil pot;

wherein the oil flows to the oil pot along the length of the receiver and the flow of refrigerant into the receiver flows along the width of the receiver via a condenser output tube comprising a curvilinear discharge end having an outlet submerged in a flow of liquid refrigerant within the receiver.

14. A full oil recovery system for removing oil from a flow of an ammonia refrigerant in a refrigeration system, comprising:

a coalescing oil separator; and

a receiver, the receiver comprising:

a weir plate to separate the oil on a first side of the weir plate from the ammonia refrigerant on a second side of the weir plate; and

a condenser output tube with a curvilinear discharge end, wherein an outlet of the curvilinear discharge end is:

oriented in a direction substantially parallel to the weir plate; and

adapted to be submerged in a flow of liquid refrigerant within the receiver.

15. The full oil recovery system of claim 14 , wherein the receiver comprises a turbulence isolation plate with a plurality of perforations.

16. The full oil recovery system of claim 14 , wherein the first side comprises a first oil pot.

17. The full oil recovery system of claim 14 , wherein the second side comprises a refrigerant supply port.