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A refrigeration system particularly useful with a multicomponent refrigerant fluid wherein the refrigerant fluid is cooled in an upward leg of a first vertically oriented heat exchanger section and further cooled in a downward leg of a second vertically oriented heat exchanger section prior to refri

A refrigeration system particularly useful with a multicomponent refrigerant fluid wherein the refrigerant fluid is cooled in an upward leg of a first vertically oriented heat exchanger section and further cooled in a downward leg of a second vertically oriented heat exchanger section prior to refrigeration generation and serial recycle flow through the two heat exchanger sections.

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1. A method for providing refrigeration to a refrigeration load comprising: (A) compressing a warm refrigerant fluid, and cooling the compressed refrigerant fluid by upward flow through a first heat exchanger section; (B) further cooling the cooled refrigerant fluid by downward flow through a se

1. A method for providing refrigeration to a refrigeration load comprising: (A) compressing a warm refrigerant fluid, and cooling the compressed refrigerant fluid by upward flow through a first heat exchanger section; (B) further cooling the cooled refrigerant fluid by downward flow through a second heat exchanger section, expanding the further cooled refrigerant fluid to generate refrigeration, and providing refrigeration from the refrigeration bearing refrigerant fluid to a refrigeration load; (C) warming the resulting refrigerant fluid by indirect heat exchange with the further cooling refrigerant fluid; and (D) further warming the resulting refrigerant fluid by indirect heat exchange with the cooling compressed refrigerant fluid to produce said warm refrigerant fluid. 2. The method of claim 1 wherein the refrigerant fluid is a multicomponent refrigerant fluid. 3. The method of claim 1 wherein the cooling compressed refrigerant fluid is partially condensed by the upward flow through the first heat exchanger section. 4. The method of claim 1 wherein a portion of further cooling refrigerant fluid is condensed by the downward flow through the second heat exchanger section. 5. The method of claim 1 wherein the cooled refrigerant fluid is partially condensed after the upward flow through the first heat exchanger section and is passed as separate vapor and liquid streams downwardly through the second heat exchanger section, and further comprising subcooling the liquid stream by downward flow through the second heat exchanger. 6. The method of claim 1 wherein the provision of refrigeration from the refrigeration bearing refrigerant fluid to the refrigeration load takes place outside the first and second heat exchanger sections. 7. The method of claim 1 wherein the provision of refrigeration from the refrigeration bearing refrigerant fluid to the refrigeration load takes place at least in part within the second heat exchanger section. 8. A dual section refrigeration system comprising: (A) a first vertically oriented heat exchanger section, a compressor, and means for passing refrigerant fluid from the compressor to the bottom of the first vertically oriented heat exchanger section; (B) a second vertically oriented heat exchanger section, and means for passing refrigerant fluid from the top of the first vertically oriented heat exchanger section to the top of the second vertically oriented heat exchanger section; (C) an expansion device, means for passing refrigerant fluid from the bottom of the second vertically oriented heat exchanger section to the expansion device, and means for passing refrigerant fluid from the expansion device to the bottom of the second vertically oriented heat exchanger section; and (D) means for passing refrigerant fluid from the top of the second vertically oriented heat exchanger section to the top of the first vertically oriented heat exchanger section, and means for passing refrigerant fluid from the bottom of the first vertically oriented heat exchanger section to the compressor. 9. The dual section refrigeration system of claim 8 wherein the means for passing refrigerant fluid from the top of the first heat exchanger section to the top of the second heat exchanger section includes a phase separator. 10. The dual section refrigeration system of claim 8 wherein the means for passing refrigerant fluid from the top of the second heat exchanger section to the top of the first heat exchanger section includes a phase separator. 11. The dual section refrigeration system of claim 8 wherein the first vertically oriented heat exchanger section and the second vertically oriented heat exchanger section are separately standing sections. 12. The dual section refrigeration system of claim 8 wherein the first vertically oriented heat exchanger section and the second vertically oriented heat exchanger section are incorporated into a single structure.