HEAT EXCHANGE DEVICE AND REFRIGERATION CYCLE DEVICE EQUIPPED WITH SAME

摘要

The present invention enables the increase of in-tube heat transfer performance during condensation and evaporation without increasing pressure loss by providing at least a first heat transfer tube (20A) disposed on the upstream side of the flow of a gas and a second heat transfer tube (20B) disposed alongside the first heat transfer tube (20A) further on the downstream side than the first heat transfer tube (20A), providing the first heat transfer tube (20A) and the second heat transfer tube (20B) with grooves on the inner surface thereof, and forming a larger ratio (Aa/Do) of the area (Aa) to the outer diameter (Do) of groove sections (21a) on the first heat transfer tube (20A) in a plane perpendicular to the axis of the tube than the ratio (Ab/Do) of the area (Ab) to the outer diameter (Do) of groove sections (21b) on the second heat transfer tube (20B) in a plane perpendicular to the axis of the tube.