Multi-tube heat exchanger for heat exchange between refrigerant and water, comprises outer tube and inner tube, which is arranged in outer tube, where outer passage is defined between outer tube and inner tube

摘要

The multi-tube heat exchanger (10) comprises an outer tube (20) and an inner tube (30), which is arranged in the outer tube. An outer passage (12) is provided, which is defined between the outer tube and the inner tube. Multiple convex portions (36) are provided, which protrude into the outer passage. Multiple concave portions are provided, which are recessed from an inner passage (13) formed in a wall of the inner tube.