HEAT EXCHANGER FOR SUPERCRITICAL COOLING OF WORKING MEDIUM IN TRANSCRITICAL COOLING CYCLE Russian patent published in 2008 - IPC F28D1/00 

FIELD: heat exchanger, applicable in cooling cycle.

SUBSTANCE: the heat exchanger has a pair of headers, whose longitudinal axes are in parallel to each other, a great number of tubes separated from one another along the longitudinal axes of the headers, coiled fins passing between the adjacent pairs of tubes. Each fin has a length passing in parallel with the parallel branches of the adjacent tubes, and a lateral width passing crosswise at least of two parallel branches of the adjacent tubes. Each tube is bent for determination at least of two parallel tube branches so that the working medium flows in succession through at least two parallel chambers from one header to the other. Each tube has a flattened section with a larger dimension and a smaller dimension, and the larger dimensions of each parallel branch lie in one plane that passes crosswise the longitudinal axes of the fins. Each fin has a great number of alternating crosspieces and elongated separators located between the parallel branches of the adjacent tubes for separating the width of each fin into a great number of discrete elements. Each fin element corresponds to one parallel branch of each adjacent tube and passes along it. Each fin has a height passing from one tube to the adjacent tube in parallel with the longitudinal axes of the headers, and the larger dimension of the tubes does not exceed this height of the fin. The larger dimension of each tube does not exceed 8.128 mm or 12.7 mm, and the smaller dimension does not exceed 1.524 mm or 2.54 mm. the separators in the fins may be slots or slotted holes that do not require any removal of the fin material at their forming in the fin. The separators and the crosspieces have length passing in parallel with the fin length, and the relation of the lengths of the separators and the lengths of the crosspieces may be within 200 to 600. At least one of the tubes may have a great number of holes and has a hydraulic diameter within 0.381 to 1.016 mm.

EFFECT: perfect supercritical cooling of working medium in the transcritical cooling cycle.

8 cl