Patent ID: 11892206
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 2:
3. The heat exchanger according to claim 1, wherein
the third heat transfer tube is configured as a circular tube,
the third heat transfer tube has a third inner circumferential surface, and at least one third groove recessed relative to the third inner circumferential surface and arranged side by side in a circumferential direction of the third heat transfer tube, and
with regard to at least one of a number, a depth, and a lead angle of each of the at least one first groove and the at least one third groove, and a tube thickness of each of the first heat transfer tube and the third heat transfer tube,
at least one of the number, the depth, and the lead angle of the at least one first groove, and the tube thickness of the first heat transfer tube is greater than at least one of the number, the depth, and the lead angle of the at least one third groove, and the tube thickness of the third heat transfer tube.