烟管（5）中的水管（4）减小了烟道流动截面积、加大了烟气流速，使得烟气传热性能增强、热效率高。
The water pipe (4) of the smoke pipe (5) reduces the flowing section of the smoke channel, speeds up the smoke flow, improving the heat transmission performance and efficiency.
烟管（5）中的水管（4）减小了烟道流动截面积、加大了烟气流速，使得烟气传热性能增强、热效率高。
The water pipe (4) of the smoke pipe (5) reduces the flowing section of the smoke channel, speeds up the smoke flow, improving the heat transmission performance and efficiency.
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