PURPOSE: To prevent a bared tube from being worn owing to a shot cleaning steel ball by providing at least two stages or more of the bared tubes not includ ing any fin on an upper surface side of a fin equipped heat exchanger for shot cleaning dust removal. ;CONSTITUTION: There are disposed at least two stages or more of dummy tubes 19 not including any fin on the upper surfaces of a plurality of heat pipe groups constituting an evaporation part. There are laminated upper stage first line tubes 14, upper stage second line tubes 15..., all including fin equipped tubes 11 below the dummy tube. A shot cleaning steel ball 16 that falls down from an upstream as indicated by an arrow 13 is prevented from directly colliding the fin of the fin-equipped tube 11. The dummy tube 19 may be disposed independently of the fin-equipped tube. Hereby, a worn dummy tube is easily replaced and hence the fin-equipped tube is prevented from being worn.;COPYRIGHT: (C)1996,JPO
展开▼
