Abstract:
PROBLEM TO BE SOLVED: To provide a heat exchanger capable of miniaturization and reducing footprint.SOLUTION: In the heat exchanger 11, a heat transfer tube row unit forming a square shape on the same plane is formed of a plurality of parallel outer tubes 13, at least two inner tubes 15 which are inserted in the outer tubes 13 with opposite ends let out, a primary branch tube 17 connected to the inlet ends of all the inner tubes 15, a secondary branch tube 19 connected to the inlet ends of all the outer tubes 13, through which the inner tubes 15 penetrate, a primary collecting tube 21 connected to the outlet ends of all the inner tubes 15, and a secondary collecting tube 23 connected to the outlet ends of all the outer tubes 13, through which the inner tubes 15 penetrate. The heat exchanger 11 includes a pair of parallel shell end tubes 37 through which the outer tubes 13 penetrate on the inner side of the secondary branch tubes 19 and the secondary collecting tube 23, and a shell 41 of a flattened square tube shape air-tightly covering the outer tubes 13 and having opposite ends connected to and sealed by the pair of shell end tubes 37 and the inside communicating with the insides of the pair of shell end tubes 37.
Abstract:
PROBLEM TO BE SOLVED: To provide a heat exchanger exchanging heat by using a multiple tube and enabling efficient heat exchange.SOLUTION: The heat exchanger 1 using a heat transfer tube 4 having outer tubes 42 and inner tubes 41 is configured so that both ends of each inner tube 41 are extended from each outer tube 42, and header units 21 allowing a first fluid to flow from the outer peripheries of the extended portions of the inner tubes 41 into clearances with the outer tubes 42 are provided. The header units 21 are vertically stacked with predetermined clearances W by inserting clearance forming members 8 or the like therebetween. Furthermore, the portions of each inner tube 41, which are extended from each header unit 21, are covered from both outer sides with a header cover 3b for allowing a second fluid to flow in. Thus, the second fluid flowing in from the header cover 3b passes through each inner tube 41, and passes through the outer surface of each outer tube 42 along the axial direction via the clearances W, so that heat is exchanged from the inside and outside of the tube 42.