Vapor compression system

1. A heating, ventilation, air conditioning, and refrigeration (HVAC&R) system comprising:

a refrigerant loop;

a compressor disposed along the refrigerant loop and configured to circulate refrigerant through the refrigerant loop, wherein the compressor comprises an inlet extending from an external surface of a housing of the compressor; and

an evaporator disposed along the refrigerant loop and configured to place the refrigerant in thermal communication with a cooling fluid, wherein the refrigerant surrounds a tube bundle disposed in the evaporator, the tube bundle is configured to flow the cooling fluid, the evaporator comprises a discharge extending from an exterior surface of a shell of the evaporator, wherein the discharge is configured to direct the vapor refrigerant from the evaporator to the inlet of the compressor, and an interface between the discharge and the inlet, wherein the interface, the discharge, and the inlet are without a bend.

2. The HVAC&R system of claim 1 , wherein a height of the evaporator is between 10% and 50% of a length of the evaporator, and wherein the height of the evaporator is between 10% and 50% of a width of the evaporator.

3. The HVAC&R system of claim 2 , comprising the tube bundle of the evaporator, wherein the tube bundle is configured to direct the cooling fluid through multiple passes of the length of the evaporator.

4. The HVAC&R system of claim 1 , wherein the discharge and the inlet are coaxial with one another.

5. The HVAC&R system of claim 1 , wherein the evaporator comprises an economizer configured to receive and preheat the refrigerant before the refrigerant surrounds the tube bundle.

6. The HVAC&R system of claim 1 , wherein the interface comprises a flanged connection between the discharge and the inlet.

7. A heating, ventilation, air conditioning, and refrigeration (HVAC&R) system, comprising:

a refrigerant loop;

a compressor disposed along the refrigerant loop and configured to circulate refrigerant through the refrigerant loop, wherein the compressor comprises an inlet extending from an external surface of a housing of the compressor; and

an evaporator disposed along the refrigerant loop and configured to place the refrigerant in thermal communication with a cooling fluid to evaporate the refrigerant into vapor refrigerant, wherein the evaporator comprises a discharge extending from an exterior surface of a shell of the evaporator, wherein the discharge is configured to direct the vapor refrigerant from the evaporator to the inlet of the compressor, wherein the evaporator comprises an interface between the discharge and the inlet, wherein the interface, the discharge, and the inlet are without a bend, and wherein a first central axis of the discharge and a second central axis of the inlet are axially aligned such that the vapor refrigerant travels in one direction from the evaporator to the compressor.

8. The HVAC&R system of claim 7 , wherein the compressor is driven by a hermetically sealed, in-line permanent magnet motor.

9. The HVAC&R system of claim 7 , wherein the refrigerant is a low pressure refrigerant.

10. The HVAC&R system of claim 9 , wherein the low pressure refrigerant is R-123.

11. The HVAC&R system of claim 7 , comprising a condenser configured to receive the vapor refrigerant from the compressor and condense the vapor refrigerant to the refrigerant.

12. The HVAC&R system of claim 11 , comprising a subcooler and an economizer disposed between the condenser and the evaporator, wherein the subcooler is configured to subcool the refrigerant exiting the condenser, and wherein the economizer is configured to preheat the refrigerant before the refrigerant is placed in thermal communication with the cooling fluid in the evaporator.

13. The HVAC&R system of claim 7 , wherein a height of the evaporator is between 10% and 50% of a length of the evaporator, and wherein the height of the evaporator is between 10% and 50% of a width of the evaporator.

14. The HVAC&R system of claim 7 , wherein the evaporator comprises a box shape.

15. The HVAC&R system of claim 7 , wherein the interface comprises a flanged connection between the discharge and the inlet.

16. A heating, ventilation, air conditioning, and refrigeration (HVAC&R) system, comprising:

a refrigerant loop;

a compressor disposed along the refrigerant loop and configured to circulate refrigerant through the refrigerant loop, wherein the compressor comprises an inlet extending from an external surface of a housing of the compressor; and

an evaporator disposed along the refrigerant loop and configured to place the refrigerant in thermal communication with a cooling fluid to evaporate the refrigerant to a vapor refrigerant, wherein the refrigerant surrounds a tube bundle disposed in the evaporator, the tube bundle is configured to flow the cooling fluid, the evaporator comprises a discharge extending from an exterior surface of a shell of the evaporator, wherein the discharge is configured to direct the vapor refrigerant from the evaporator to the inlet of the compressor, wherein the discharge, the inlet, and an interface between the discharge and the inlet are without a bend, and the discharge and the inlet are coaxially aligned such that the vapor refrigerant travels in a vertical direction from the evaporator to the compressor.

17. The HVAC&R system of claim 16 , wherein the inlet of the compressor is configured to have a uniform size.

18. The HVAC&R system of claim 16 , wherein a height of the evaporator is between 10% and 50% of a length of the evaporator, and wherein the height of the evaporator is between 10% and 50% of a width of the evaporator.

19. The HVAC&R system of claim 16 , wherein the evaporator comprises a box shape.

20. The HVAC&R system of claim 16 , wherein the interface comprises a flanged connection between the discharge and the inlet.