Patent ID: 7055586
Filing Date: 2006-06-06
Classification: F28D,F28F

Abstract:
1. A multi-tube heat exchanger comprising an inner tube group in which a first fluid passes and an outer tube in which a second fluid passes, both ends of each inner tube in said inner tube group being held and disposed on introduction/discharge side holding plates located on each of first fluid introduction side and first fluid discharge side, wherein each said inner tube is constituted of only an inner tube main body having a substantially flat section and a number of parallel sheet-like or lump-like projections disposed at locations extending across substantially a full width of the interior of the heat transmitting tube main body at a predetermined interval in the length direction and width direction on one or both of opposing wall faces on longer sides of the inner tube main body, wherein said projections are formed obliquely on said one wall face and in parallel on said opposing wall face between the obliquely-arranged projections in the length direction in parallel to the gas flow.