文章从实际情况出发，介绍了燃气快速热水器在热负荷变化时使用不同类型的风机对燃烧热效率的影响。

Based on practical situations, the article introduces the influence of different type fan to gas instantaneous water heater combustion thermal efficiency when heat load changes.

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通过(火用)平衡与热平衡的对比分析和热效率与(火用)效率的分析计算，论述了(火用)平衡能更科学、更准确地反映轮窑实际用能状况。

Through analysis and calculation of heat efficiency and Exergy efficiency, the paper proves this Exergy theory is far more accurate to reflect the actual feature of energy using.

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针对传统方法计算繁杂的问题，本文提出了基于双并联人工神经网络的汽轮机实际循环热效率计算方法。

To counter the difficulty of traditional method, the parallel connection feed-forward network of calculation method for the actual cycle thermal efficiency of a steam turbine is proposed.

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