Evaluation methods for heat exchanger 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。
The results show, when heating, the primary energy ratio of GEHP is 1.76 and exergy efficiency is 29.12%.
结果表明：燃气机热泵在供热时的一次能源利用率为1.76，(火用)效率为29.12%。
The results show that in order to obtain higher exergy efficiency number of transfer unit(NTU)and capacitance ratio should be selected carefully for they have optimum values.
指出为取得较高的（火用）效率，传热单元数和水当量比应仔细选择，它们有一最佳值。
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