| 摘要 |
PROBLEM TO BE SOLVED: To provide an evaporation type heat transfer tube for bromine cooling unit with excellent heat exchange efficiency. SOLUTION: The heat transfer tube 100 comprises a spiral single fin 31, the fin 31 including a secondary groove 32. Since the fin 31 is divided by the secondary groove 32, droplets which fall on the fin 31 and the heat transfer tube 100 can rapidly diffuse along the circumferential direction and axial direction of the tube and the circumferential direction of the fin to form a liquid film. Therefore, a refrigerant can sufficiently contact the surface of the heat transfer tube, and the condensation rate of droplets can be enhanced. COPYRIGHT: (C)2007,JPO&INPIT
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