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通过确切了解电站高压加热器的传热性能和特殊的设备要求，设计并加工出小螺旋角的内外螺旋三角翅片管用于强化其传热性能。基础实验表明，在实验的条件下，立式小螺旋角的内外螺旋三角翅片管的总传热系数比光滑管提高６３％～９５％，其中管外冷凝换热系数是同条件下光滑管的３．５～４倍，管内的对流换热系数也比光滑管提高了１８％。同螺旋槽管比较可知，立式小螺旋角的内外螺旋三角翅片管的总换热系数比螺旋槽提高４％～２７％，而管内流动阻力系数只有螺旋槽管的４０％～８０％。工业实验表明，采用螺旋角的内外螺旋三角翅片管的立式高压加热器总换热系数比原来提高了４３％，在等面积下使用可收到明显的节能降耗效果。图９表２参５
By knowing the heat transfer performance and special equipment requirements of high-pressure heaters in power stations, the design and manufacture of small spiral internal and external spiral finned finned tubes are used to enhance the heat transfer performance. The experimental results show that under the experimental conditions, the total heat transfer coefficient of the internal and external spiral finned tubes with vertical small helix angle is increased by 63% -95% compared with that of the smooth tube. The heat transfer coefficient outside the tube is the same as that of the smooth tube Of 3.5 to 4 times the tube convection heat transfer coefficient is also increased by 18% compared to smooth tube. The results show that the total heat transfer coefficient of internal and external spiral finned tubes with vertical small helix angle is 4% ~ 27% higher than that of spiral groove, while the coefficient of flow resistance in tube is only 40% ~ 80% of that of spiral grooved tube. Industrial experiments show that the use of spiral helical angle finned tube vertical high-pressure heaters, the total heat transfer coefficient increased by 43% than the original, the use of the same area can receive significant energy saving effect. Figure 9 Table 2 Reference 5