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.
另外，快速傅立叶变换仅适用于分析平稳渐变的信号，不能适应负荷动态变化的电力谐波检测。
In addition, FFT is applicable to analyze gradually-changed signals instead of detecting harmonics when the load breaks.
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