本文针对风冷热泵冷热水机组的逆循环除霜进行了实验研究，得到了除霜时系统参数随时间的变化规律。

This paper presents an experimental investigation of refrigeration system dynamics during the reverse-cycle defrost of an air-source heat pump chiller.

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同时针对直热式热泵热水机组的高温可靠性、除霜、水位控制等关键点的设计要点进行分析。

At the same time, analyzes the difficulties and key points of CDHPWHU's design, for example, high-temperature reliability, defrosting, the water level control and so on.

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昨天，我们用热水才给车窗除霜。

Yesterday we had to pour hot water on the windsheld to make the window defrost.

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