The replacement of common smooth tubes by new spiral groove tubes during technical reconstruction of heatexchanger is both simple and remarkable energy-saving effectiveness.
用新型螺旋槽管代替普通光管对换热器进行技术改造，既简便易行，节能效果又显著。
2
Evaluation methods for heatexchanger are discussed, especially for indirect evaporative air cooler. The calculation methods of exergy effectiveness and exergy efficiency ratio are researched.
总结了各种换热器性能评价方法，讨论了间接蒸发冷却换热器的(火用)效率分析计算方法。
3
Heatexchanger in the heat reuse of environmental protection, metallurgy and construction materials often loses effectiveness because of the increased dirt coefficient.