Importance

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Abstract

In a heat exchanger, a respective meander passage 3₁, 3₂ in each of two stages connecting heat absorbing tubes 31 divided into the two stages and arranged in a flow direction of a combustion gas in an inside of a casing 1 from one side to the other side in a Y-axis direction is constituted, and both a heat absorbing tube 31 of #11 at an upstream end of the meander passage 3₁ in one of the stages and a heat absorbing tube 31 of #21 at a downstream end of the meander passage 3₂ in the other of the stages are made to be positioned at the one side in the Y-axis direction, a distance La between the heat absorbing tubes 31, 31 of #11 and #21, is made longer than a respective distance Lb between each heat absorbing tube 31 other than the heat absorbing tube 31 of #11 at the upstream end of the meander passage 3₁ in the one of the stages and such each heat absorbing tube 31 other than the heat absorbing tube 31 of #21 at the downstream end of the meander passage 3₂ in the other of the stages as is the closest to each heat absorbing tube 31 other than the heat absorbing tube 31 of #11 at the upstream end in the one of the stages.

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First Claim