| 摘要 |
The present invention relates to a heat exchanger unit for a boiler and a fin-less type multi-pipe heat exchanger for a boiler having the same to improve the heat exchange efficiency with double heat exchange through the inside and outside of a heat exchange pipe; and to be made into various boilers by changing the number of units stacking one another. To achieve this, the fin-less type multi-pipe heat exchanger carries out heat exchange by primarily heating the outer pipe of multiple heat exchange pipes in a double pipe form using a flame generated by a burner. In addition to this, the fin-less type multi-pipe heat exchanger carries out double heat exchange through multiple inner pipes as high temperature combustion gas is discharged through an exhaust gas passage formed in the inner pipes. |
