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sub cool

The heat exchange relationship which takes place within the sub-cooler 14 is provided by supplying the main portion of the refrigerant through the line 13 into a spray bar 40 which extends along the length of the outer housing 14 of the sub-cooler and is located near the top of that outer housing. A plurality of spray nozzles 42 are located at spaced intervals along the length of the spray bar 40. These nozzles are located to spray the refrigerant in a fan-like pattern outwardly and downwardly into physical contact with the separate parallel cooling coils 52 located throughout the interior of the housing 14. As the refrigerant passing out of the nozzles 42 comes into contact with the various cooling coils 52, the temperature is dropped; and liquid refrigerant pools or locates at the bottom of the housing 14, as indicated in dotted lines in FIG. 1. An outlet 55 is provided near the bottom of the right-hand end of the housing 14 (as viewed in all three figures), and this outlet is connected to the line 17 to supply the liquid refrigerant to the main expansion valve 18 for the system.

an outer housing, having a main inlet coupled to the condensor outlet and a main outlet coupled to the expansion device, and having a second inlet and a second outlet;
Obviously, if the amount of refrigerant can be reduced without a corresponding reduction in the cooling capacity of the system, several advantages occur. First of all, there is less refrigerant available to leak into the atmosphere to cause damage to the ozone layer. In addition, the cost of the refrigerant for the system is reduced since less refrigerant is used. Finally, when less refrigerant is required in a given system, the pressure of the refrigerant provided by the compressor does not need to be as high as when a greater amount of refrigerant is present. This results in a reduction of the mechanical strain on the sytem, thereby increasing the useful life of the various components used in the refrigeration system.

said collector means having a plurality of inlets and an outlet, the plurality of inlets thereof coupled with the outlet ends of said plurality of separate cooling coils and the outlet thereof coupled with said second outlet;
means coupling said second outlet of said outer housing with the inlet of the compressor.
said distributor means having an inlet and a plurality of outlets corresponding to said plurality of cooling coils, the inlet of said distributor means coupled with said second inlet and the outlets thereof coupled with the corresponding inlets of said plurality of cooling coils;
Reference now should be made to the drawing in which the same reference numbers are used throughout the different figures to designate the same components.
2. The combination according to claim 1 wherein said spray bar is closed at said second end thereof and said apertures therein each have an area substantially less than the internal cross-sectional area of said spray bar.

Since the expanded coolant supplied from the thermal expansion valve 24 is provided in parallel through the distributor to each of the six cooling coils 52, all of the cooling coils 52 have substantially the same temperature of coolant supplied through them, so that the cooling action taking place within the housing 14 is uniform throughout the housing. The orientation of the various cooling coils 52 within the housing may be effected in a different relationship to the spray bar 40 from the one illustrated, but the orientation illustrated has been found to be very effective in a commercial embodiment of the invention which has been successfully operated.

A sub-cooler for a refrigeration system is located between the condenser and the expansion device for the evaporator. The sub-cooler has a sealed cylindrical housing with a main inlet coupled to the o