HEAT TRANSFER TUBE FOR DOUBLE-TUBE HEAT EXCHANGER

摘要

PROBLEM TO BE SOLVED: To provide a double-tube heat exchanger heat transfer tube capable of effectively improving heat transfer performance.;SOLUTION: The heat transfer tube 1 for a double-tube heat exchanger includes a first heat transfer tube 2 containing a corrugated tube in which water flows, with a helical corrugated groove 2a provided on the outer peripheral surface, and a second heat transfer tube 3 which is arranged inside the first heat transfer tube 2 and in which tube members 4 and 5 though which coolant flows are twisted spirally to be assembled each other. In the first heat transfer tube 2, with a dimensional difference between the diameter of circumscribed circle of the second heat transfer tube 3 and the minimum inner diameter of the corrugated tube being assumed as Dd and a Reynolds number of water as Re, a groove depth Hc of the corrugated groove 2a is set according to the dimensional difference Dd and the Reynolds Number Re.;COPYRIGHT: (C)2012,JPO&INPIT